False
Explanation:
The Unit of Frequency is Hertz (Hz)
Frequency in layman’s language can be said as a number of times a particular event repeat itself in unit time.
E.g. Supposing a hypothetical situation in which a boy cracks 5 nuts every minute, then his frequency can be said to be 5 nuts /min
However, in physical dimensions, the frequency is always calculated in terms of a second (as a measure of unit time).
Hence the Standard unit (SI)of Frequency is named after German origin physicist Heinrich Hertz. In simple terms, 1 Hertz denotes the event repeats itself one time per second and in physics domain one cycle per second.
Three resistors with values of 4.0 W, 6.0 W, and 8.0 W, respectively, are connected in series. What
is their equivalent resistance?
The answer would be 18 W
The equivalent resistance of three resistors with values of 4.0 ohms, 6.0 ohms, and 8.0 ohms connected in series is 18.0 ohms.
The question asks for the equivalent resistance of three resistors connected in series with resistance values of 4.0 ohms, 6.0 ohms, and 8.0 ohms. When resistors are connected in series, the equivalent resistance (Requiv) is the sum of the individual resistances. The formula used is Requiv = R1 + R2 + R3.
Applying the given values:
Requiv = 4.0 Ω + 6.0 Ω + 8.0 Ω
Requiv = 18.0 Ω.
Therefore, the equivalent resistance of the three resistors connected in series is 18.0 ohms.
Find the density of seawater at a depth where the pressure is 680 atm if the density at the surface is 1030 kg/m3. Seawater has a bulk modulus of 2.3 × 109 N/m2. Bulk modulus is defined to be
B ≡ rho0 ∆P ∆rhoAnswer in units of kg/m3.
Answer:
[tex]1060.41kg/m^3[/tex]
Explanation:
Bulk modulus is defined as the relative change in the volume of a body produced by a unit of compressive acting uniformly over its surface:
[tex]B=\rho _o \frac{\bigtriangleup P }{\bigtriangleup \rho}[/tex]
Hence the density of the seawater at a depth of 680atm is calculated as:-
[tex]\rho=\rho_o +\bigtriangleup \rho=\rho_o(1+\frac{\bigtriangleup P}{B})\\\\=1030 \times (1+ \frac{(680-1)\times10^5}{2.3\times 10^9})\\=1060.41kg/m^3[/tex]
Through which of the following can sound energy NOT be transferred?
Answer:
Vacuum
Explanation:
Sound energy as mechanical wave cannot be transmitted through a vacuum.
As a wave, which is a disturbance that transmits energy from one point to another, it requires a material medium for propagation.
Sound energy is a mechanical wave. It requires particles and a medium to be propagated. By so doing, this form of energy cannot be transmitted through a vacuum body. In such bodies, there is no medium of propagation.What determines the type of element an atom is?
O
O
O
A. The number of neutrons
B. The number of protons
C. The number of electrons
O
D. The combined number of protons and neutrons
Answer:
B. The number of protons.
Explanation:
Number of [tex]protons[/tex] in the [tex]atomic\ nucleus.[/tex]
Protons are positively charged components of the atomic nucleus and it is what makes one element different from another.
How does secondhand smoke affect children?
It increases their asthma rates.
It increases their attention span.
It increases their learning ability.
It increases their chance of obesity.
Answer:
It increases asthma rates
Explanation:
Where a compass points to in Hudson Bay Canada
Answer:
Temagami, James Bay
Explanation:
011 10.0 points
A sound wave has a frequency of 798 Hz in air
and a wavelength of 0.48 m.
What is the temperature of the air? As-
sume the velocity of sound at 0°C is 329 m/s.
Answer in units of °C.
vil
Explanation:
From the Newton's velocity of sound relationship , the velocity of sound is directly proportional to the square root of temperature .
In this case The velocity of sound = frequency x wavelength
= 798 x 0.48 = 383 m/sec
Suppose the temperature at this time = T K
Thus 383 ∝ [tex]\sqrt{T}[/tex] I
The velocity of sound is 329 m/s at 273 K ( given )
Thus 329 ∝ [tex]\sqrt{273}[/tex] II
Dividing I by II , we have
[tex]\frac{383}{329}[/tex] = [tex]\sqrt{\frac{T}{273} }[/tex]
or [tex]\frac{T}{273}[/tex] = 1.25
and T = 339.8 K = 66.8° C
ASAP please help with this
Answer:
4) 1 - mass; 5) 3 - Their masses and how far apart they are; 6) See the explanation below.
Explanation:
4)
The force of gravity between two bodies is defined by the following equation.
[tex]F_{g}=\frac{m_{1}*m_{2}*G}{d^{2}}\\ where:\\G = Universal gravitation constant = 6,674 *10^{-11} [N*m^2/kg^2] \\m_{1}= mass 1\\m_{2}= mass 2\\d = distance between the 2 bodies[/tex]
We can see that the gravity force depends on the masses and the distance between them.
5)
The gravity force depends on the masses and the distance between them.
[tex]F_{g}=\frac{m_{1}*m_{2}*G}{d^{2}}\\ where:\\G = Universal gravitation constant = 6,674 *10^{-11} [N*m^2/kg^2] \\m_{1}= mass 1\\m_{2}= mass 2\\d = distance between the 2 bodies[/tex]
6)
The heaviest object found at the bottom of the container is the copper block, since its density is the largest even larger than that of the liquid at the bottom.
The next block is the rubber one, we can see that it's floating over the corn syrup fluid. This is because the density of the rubber block is less than that of the corn syrup, so the block floats.
The next block is plastic, with a density of 1.17 (g/cm^3). This block is located between glycerin liquids and water.
The block on the surface of the container is wood, this density is 0.71[ g / cm^ 3] a density less than that of corn oil.
_____ replacement involves one element replacing another element in a compound.
Answer:
Single replacement
Explanation:
A single replacement reaction is a reaction in which the less reactive elements are replaced by the more reactive element in a compound. This is so because the more reactive element are higher in the electrochemical series element than the less reactive elements
The term is single replacement reaction in chemistry, where one element replaces another in a compound. An example is the reaction between zinc and copper sulfate, forming zinc sulfate and copper.
Explanation:The process being referred to is known as a single replacement reaction or single displacement reaction in chemistry. A single replacement reaction involves one element displacing another element in a compound, resulting in a new element and a new compound. For example, the reaction between zinc and copper sulfate can be represented as Zn + CuSO4 → ZnSO4 + Cu, where zinc replaces copper in the compound copper sulfate to form zinc sulfate.
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51.34
Which refers to the amount of heat required to change the temperature of 1 gram of a substance by 1"C and is related to
the chemical composition of the substance?
Thermal energy
Specific heat
Activation heat
Boiling point
Answer:
Specific heat.
Explanation:
I got it right!
Select the correct answer.
Which statement best explains that sound waves are pressure waves?
A.
Sound waves have regions of compressions and rarefactions.
B. Sound waves cannot propagate through metals.
C. Sound waves move perpendicular to the medium particles.
D. Sound waves cannot propagate through water.
Answer:
C
Explanation:
Sound waves move perpendicular to the medium particles.
Answer:
its c for sure
Explanation:
If a 4 Hz wave travels 2000 meters per second what is the wavelength
Answer:
500m
Explanation:
See attachment below
Select all the correct answers.
Which three statements about electromagnetic radiation are true?
0
Light is a kind of electromagnetic radiation.
0
Electromagnetic radiation can travel only short distances.
O
Electromagnetic radiation has no mass.
O
Electromagnetic radiation can travel through a vacuum.
All kinds of electromagnetic radiation are invisible.
Yo sup??
the 1st, 3rs and 4th statement are true because electromagnetic waves can travel large distances and electromagnetic waves are visible (only 400-700 nm wavelenght)
Hope this helps
I need help, Ill glady appreciate any responses
I know I am a smart person, but my doubtness does not let me
How can I start believing more on myself?
How can I be more confident?
Answer: Answer: First, You should try to think positive thoughts. Then, you should try and pinpoint your achievements. You often see your failures more than the success. Moreover, you should go check the impostor syndrome in ted ed. If you are trying to be more confident in your school choices than you should try to check the information again or try to go back and remember the time you studied the subject assignments you are doing.
Explanation: That other guy gave a great answer but can you still give a brainliest?
Harry Potter or Pokemon Sword?
I can't decide what i'd prefer
I'd go both
A 30 kg child climbs 15 meters up a tree. When he looks around, when is the child’s potential energy ?
Answer:
Gravitational potential energy of the child = 4410 J.
Explanation:
Given data:
Mass of the child, [tex]m = 30 \ kg[/tex]
Mass of the child, [tex]h = 15 \ m[/tex]
The gravitational potential energy of the child at 15 m height can be given as,
[tex]GPE = mgh[/tex]
[tex]GPE = 30 \times 9.80 \times 15[/tex]
[tex]GPE = 4410 \ \rm J.[/tex]
The potential energy of the child is 4410J
POTENTIAL ENERGY:
The potential energy (P.E) of a body refers to its energy at a position. The potential energy can be calculated using the formula below:P.E = mass (m) × gravitational force of the Earth (g) × height (h)
Where; g = 9.8m/s²
According to this question, a 30 kg child climbs 15 meters up a tree, his potential energy can be calculated thus:P.E = 30kg × 15m × 9.8m/s²
P.E = 4410Joules.
Therefore, the potential energy of the child is 4410J.Learn more at: https://brainly.com/question/24284560?referrer=searchResults
what is the ability of water to condense on the surface on a cool glass mainly due to?
Because of its contact with air surface
Explanation:
When the water comes into contact with surface of a cool glass, water surface gets its contact with open surface air.
Due to the contact of water droplets with atmospheric air water particles condense up, which means molecules inside the water droplets comes into close contact where the inter molecular spaces becomes tight than previous.
Hence, Water gets condensed while it is brought into contact with cool glass.
when water droplets in clouds become heavy, they fall to earth as _______ ?
A - evaporation
B - condensation
C - permafrost
D - precipitation
Answer:D: Precipitation please give brainliest
Explanation: As liquid is heated by the sun's warmth, it changes into a gas form and rises in the atmosphere. In the air, water vapor cools and returns to a liquid form. ... These water droplets cling together and form clouds. When the droplets become heavy enough, they fall to the ground as precipitation.
Final answer:
Water droplets in clouds fall to Earth as precipitation (option D) when they become heavy enough. This precipitation can fall as rain, snow, sleet, or hail, depending on the air temperature.
Explanation:
When water droplets in clouds become heavy, they fall to Earth as precipitation (option D). This process occurs when water vapor in the atmosphere condenses into tiny droplets of liquid water, forming clouds. If these droplets accumulate enough mass, they can no longer be supported by the air currents in the cloud and fall to the ground as various forms of precipitation, depending on the temperature of the air. Warm air will usually cause the droplets to fall as rain, while cold air can lead to snow, sleet, or hail.
The areas of the pistons are 20 cm^2 and 100 cm^2. A force of 10 N is applied to the small piston. How much force is on the large pistons?
Answer:
50N
Explanation:
A1 (area of the smaller piston) = 20cm² = 0.2m²
F1 (force acting on the smaller piston) = 10N
F2 (force acting on the larger piston) =?
A2 (area of the larger piston) = 100cm² = 1m²
F1 / A1 = F2 / A2
F2 = (F1*A2) / A1
F2 = (10*1) / 0.2
F2 = 50N
Final answer:
Through Pascal's law, applying a force of 10 N to a small piston in a hydraulic system can exert a force of 50 N on a larger piston, illustrating the force magnification capability of hydraulic systems.
Explanation:
The problem you've posed relates to the principles of a hydraulic system, which leverages Pascal's law to transmit force through a fluid in a confined space. According to Pascal's law, the pressure applied to a confined fluid is transmitted undiminished in every direction throughout the fluid. In the context of hydraulic systems, this principle allows for force magnification or reduction based on the areas of the pistons involved.
Given the force applied to the smaller piston (10 N) and the areas of the small (20 cm2) and large (100 cm2) pistons, we can calculate the force exerted on the larger piston as follows:
First, calculate the pressure applied by the small piston: Pressure (P) = Force (F) / Area (A), hence P = 10 N / 20 cm2 = 0.5 N/cm2.Since the pressure is transmitted undiminished, the force on the large piston can be found by multiplying the pressure by the larger area: F = P × A = 0.5 N/cm2 × 100 cm2 = 50 N.Therefore, the force exerted on the large piston by applying a force of 10 N to the small piston, in an ideal hydraulic system ignoring friction and other losses, is 50 N.
Greek philosophers such as Demoncritus and Aristotle had ideas about the composition of matter. For example, Demoncritus believed matter was made of tiny, solid spheres that he called atomos, and Aristotle thought matter was made up of earth, water, fire, and air. Aristotle's idea of matter was the accepted idea for over 2,000 years until John Dalton came up with a new theory about matter based on his experimental data. Which of the following best explains why Dalton's theory became more widely-accepted over Aristotle's theory?
A) Aristotle's theory became the law of conservation of mass when he documented phase changes of matter.
B) Dalton's theory was more complete because more respected scientists found the ideas possible.
C) Aristotle's theory did not have enough direct evidence due to poor observational tools.
D) Dalton's theory had repeated observations which were supported by extensive evidence.
Answer:
D) Dalton's theory had repeated observations which were supported by extensive evidence.
Explanation:
Dalton had a basis for this prediction and theory. He worked extensive on gases before stepping forward with the Dalton's atomic theory.
His scientific conjecture was highly corroborated with a wide array of experimental evidence and many infallible proofs.
Science is a logical way of reasoning that follow methodological approaches. It deals with empirical experimental proofs that must have been gathered and the veracity ascertained. Dalton during his time presented the scientific community with a pool of observations balanced with experimental evidences he accumulated with time.Final answer:
John Dalton's atomic theory superseded Aristotle's theory because it was based on repeated observations and extensive experimental evidence, marking a shift to scientific methodology in understanding matter.
Explanation:
The reason why John Dalton's atomic theory became more widely accepted over Aristotle's theory of matter is choice D) Dalton's theory had repeated observations which were supported by extensive evidence. Unlike Aristotle, who postulated that matter was composed of four elements - earth, air, fire, and water - without empirical evidence, Dalton based his atomic theory on experimental data. He made quantitative measurements and supported his hypotheses with detailed observations on the weights and combinations of elements.
Dalton's work marked a significant transition from philosophical speculation to scientific methodology in understanding the composition of matter. This alignment with the emerging scientific methods of the time made Dalton's theory far more persuasive and enduring than Aristotle's more abstract and empirically unsupported notions.
PLEASE HELP!!!
Question 17 (1 point)
How long does it take a car accelerating at 3.87 m/s^2 from rest to cover 1020 m?
Choices:
A: 527 s
B: 264 s
C: 23.0 s
D: 16.2 s
Answer:23 seconds
Explanation:
Acceleration(a)=3.87m/s^2
distance(d)=1020m
Initial velocity(u)=0
d=uxt + (axt^2)/2
1020=0xt + (3.87xt^2)/2
1020=(3.87xt^2)/2
Cross multiply
1020x2=3.87xt^2
2040=3.87xt^2
t^2=2040/3.87
t^2=527.13
t=22.95
Time(t) is approximately 23seconds
What type of chemical reaction occurs when less energy is released during the chemical reaction than is needed to start the chemical reaction
Answer:
Endothermic reaction
Explanation:
If the reaction releases less energy than the energy needed to start the chemical reaction, then the reaction takes energy from the system. An endothermic reaction is a reaction that will takes energy from the system. Those energies will be put into the product of the reaction, make the product have higher potential energy than the reactant. The product of this reactant will be less stable since it's at a high energy state.
The type of chemical reaction where less energy is released than is required to initiate the reaction is called an endothermic reaction.
Explanation:A chemical reaction that requires more energy to start than is released during the reaction is called an endothermic reaction. These reactions absorb energy from their surroundings, and the energy required to initiate the reaction is called the activation energy. Endothermic reactions have a net absorption of energy because the energy needed to break the bonds in the reactants is greater than the energy released from forming new bonds in the products. For example, photosynthesis is an endothermic reaction where the energy from sunlight is absorbed to convert carbon dioxide and water into glucose.
An ambulance is speeding towards you at 20 m/s. If the siren is producing a sound at a frequency of 737 Hz, what is the frequency you hear? (The speed of sound is 343 m/s).
Answer:
828 Hz
Explanation:
The Doppler effect equation states:
fr = (c + vr) / (c + vs) fs,
where fr is the frequency heard by the receiver,
c is the speed of sound,
vr is the velocity of the receiver,
vs is the velocity of the source,
and fs is the frequency emitted at the source
One important note: vr is positive if the receiver is moving towards the source, negative if away.
Conversely, vs is positive if the receiver is moving away from the source, and negative if towards.
The ambulance is moving toward you, so vr is positive and vs is negative.
Plugging values into the equation:
fr = (343 m/s + 20 m/s) / (343 m/s − 20 m/s) (737 Hz)
fr = 828 Hz
As you would expect from the Doppler effect, you hear a higher frequency when the ambulance is moving toward you.
21) A youngster having a mass of 50.0 kg steps off a 1.00 m high platform. If she keeps her legs fairly rigid and comes to rest in 10.0 ms, what is her momentum just as she hits the floor? What average force acts on her during the deceleration?
Answer:
-22,150 N
Explanation:
When the youngster jumps off the platform, during the fall her initial potential energy is converted into kinetic energy, according to the law of conservation of energy. Therefore, we can write:
[tex]mgh=\frac{1}{2}mu^2[/tex]
where the term on the left is the potential energy while the term on the right is the kinetic energy, and where
m = 50.0 kg is the mass of the youngster
[tex]g=9.8 m/s^2[/tex] is the acceleration due to gravity
h = 1.00 m is the heigth of the platform
u is the speed of the youngster as she reaches the floor
Solving for u,
[tex]u=\sqrt{2gh}=\sqrt{2(9.8)(1.00)}=4.43 m/s[/tex]
Then, when the youngster hits the floor, the force exerted on her during the deceleration is given by:
[tex]F=\frac{\Delta p}{\Delta t}=\frac{m(v-u)}{\Delta t}[/tex]
where [tex]\Delta p[/tex] is her change in momentum, and where
m is the mass
v = 0 is the final velocity (she comes to a stop)
u = 4.43 m/s is the initial velocity
[tex]\Delta t=10.0 ms =0.010 s[/tex] is the duration of the collision
Substituting,
[tex]F=\frac{(50.0)(0-4.43)}{0.010}=-22150 N[/tex]
And the negative sign means the direction of the force is opposite to the motion (so, upward).
What is the mass of an object that has a density of 1.3 g/cm3 and a volume
of 2 cm3? (The density of an object has the equation d =m/v.)
O
O A. 1.5 g
O B. 3.39
O C. 0.7g
O D. 2.6g
O
Answer:
D.[tex]2.6g[/tex]
Explanation:
To find mass of object, you use the equation Density=Mass/Volume
Density=[tex]1.3g/cm^3[/tex]
Volume=[tex]2cm^3[/tex]
[tex]Mass=Density\ \times \ Volume\\=1.3g/cm^3\times2cm^3\\=2.6g[/tex]
The object's mass is 2.6g
The mass of the object is 2.6g. The correct answer is Option D.
Explanation:You can use the formula for density to find the mass of the object:
Density (d) = Mass (m) / Volume (v)
Rearrange the formula to solve for mass:
Mass (m) = Density (d) x Volume (v), where d is the density, m is the mass, and v is the volume. Rearranging the equation, we have m = d * v. Plugging in the values given in the question, we get m = 1.3 g/cm3 * 2 cm3. Multiplying these values together, we find that the mass of the object is 2.6g.
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10) Suppose you have a transparent material that is more dense than glass. How would the light ray be
affected? Y
According to the law of reflection, When a ray of light passes from rarer medium to denser medium , it bends towards the normal. So, if there is a transparent material that is more dense than glass then the ray of light will bend towards the normal. The direction of light through the medium is predicted by Snell's Law. According to the Snell's law:
n₁ sin θ₁ = n₂ sin θ₂
Where n₁ is the refractive index of the first medium
n₂ is the refractive index of second medium.
θ₁ and θ₂ are the angle of incidence of light in medium 1 and medium 2
A cannon ball with a mass of 100 kg flies in horizontal direction with a speed of 600 m/s and strikes a railroad freight car filled with sand and initially at rest. The total mass of the car and sand is 25,600 kg. Find the speed of the car after the ball becomes embedded in the sand
Answer:
2.334 m/s
Explanation:
From law of conservation of linear momentum, the sum of initial and final momentum are equal. Since momentum p=mv where m is mass and v is speed. The initial mass of 100 kg has momentum but lorry is at rest hence no momentum.
Initial momentum
100*600=60000 kg.m/s
Final momentum
Both lorry and 100 kg exert momentum hence total mass is 100+25600=25700 kg
25700v=60000
V=60000/25700=2.3346303501945525291828793774319066147859 m/s
Rounded off, final velocity is 2.334 m/s
Final answer:
The speed of the railroad freight car after the cannonball becomes embedded in the sand is 2.33 m/s, calculated using the law of conservation of momentum.
Explanation:
The question involves finding the speed of a railroad freight car after a cannon ball, flying in a horizontal direction, becomes embedded in the sand inside the car. This situation is governed by the law of conservation of momentum, which states that the total momentum of a system before an event must equal the total momentum after the event, assuming no external forces act on it. The initial momentum of the system is the product of the mass of the cannonball and its velocity. After the collision, the cannonball and the car move together, so their combined mass moves with a common velocity.
To solve this, the initial momentum (mass of the cannonball × its velocity) + (mass of the freight car × its initial velocity, which is zero since it's at rest) = the total mass of the system (cannonball + freight car) × the final velocity.
Substituting the given values, we have (100 kg × 600 m/s) + (25,600 kg × 0 m/s) = (25,700 kg) × final velocity. Simplifying, we find the final velocity = (60,000 kg·m/s) / 25,700 kg = 2.33 m/s.
when work is done by an applied force, the objects energy will change. in this interactive, does the work cause a kinetic energy change or a potential energy change?
for context; the interactive is “It’s all Uphill”.
According to work-energy theorem, when work is done by an applied force, the object's kinetic energy will change.
The work-energy theorem only takes into account net work; it does not take into account work produced by a single force.
According to the work-energy theorem, an object's change in kinetic energy equals the net work performed by the applied forces.
The quantity of internal and mechanical energy that things contain fluctuates as a result of work. Energy is contributed to a system or an item when work is done on it.
The body was initially at rest before the work being performed; it was only after a force was applied that there were energy changes in the kinetic energy.
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Final answer:
In the interactive 'It's all Uphill,' the work done by pushing an object up a ramp increases the object's potential energy.
Explanation:
When work is done by an applied force on an object, it results in an energy change for that object. If the interactive mentioned is 'It's all Uphill,' where the context involves pushing an object up a ramp, the work done would primarily increase the object's potential energy.
This is because as the object is raised to a higher elevation against gravity, it stores more energy in the form of potential energy which could be converted back to kinetic energy if the object were allowed to fall back down.
Work-energy theorem is crucial in understanding these concepts as it states that the work done on an object results in a change in kinetic energy. When the work is done against gravitational force, like pushing an object up an incline, it increases the object's potential energy.
Conversely, when an object is allowed to move downwards, the gravitational force does work on the object, converting its potential energy into kinetic energy.
Real-world examples, such as driving a car, illustrate how forces can do work which either increase kinetic energy (acceleration) or decrease it (braking).
When the car accelerates, the engine does work, and the car's kinetic energy increases. When you apply the brakes, they do work in the opposite direction of motion, and kinetic energy decreases.
help!
If energy is everywhere, name one location and identify 3 forms of energy present there
Answer:
factory:
-mechanical energy
-nuclear energy
-gravitational energy
Explanation:
5. A construction worker on a high-rise building is on a platform suspended between two cables as illustrated below. The construction worker weighs 850 N, the plank weighs 450 N, and the tension in the left cable is 550 N.
Answer:
a) Tc = 750 [N] ;b) See the explanation below.
Explanation:
To solve this problem, we first need a graphical explanation of this, as well as knowing the corresponding questions. Therefore, a search was carried out in google, in the attached image we will find a graphical description of the problem.
b)
The solution of this type of problem corresponds to the use of Newton's third law, applying static which tells us that the sum of the forces in a system in equilibrium without movement must be equal to zero.
a)
In this way we can find by means of a sum of forces on the y axis equal to zero:
- 850 - 450 + 550 + Tc = 0
Tc = 750 [N]