Answer:
The frequency of the sound increases
Explanation:
This phenomenon is known as Doppler effect, and it occurs when the observer is moving relative to the source of the sound (as in this case, sine you are moving towards the police car).
When you are moving towards the source of the sound, the frequency of the siren appears to increase, according to the formula:
[tex]f'=\frac{v+v_o}{v}f[/tex]
where
f' is the apparent frequency of the sound
v is the speed of the sound wave
[tex]v_o[/tex] is the speed of the observer relative to the source, and it is positive if the observer is approaching the source, or negative if the observer is moving away
f is the real frequency of the sound (in this case, 750 Hz)
1) Harold pushed a 10 kg box to the right with 7 Newtons of force. Jerome pulled the same box to the right with 7 Newtons of force. Are the forces on the box balanced? Will the box accelerate?
Given data:
mass of box = 10 kg,
Force (F1) = 7 N, (push towards rightside)
Force (F2) = 7 N (Pulled towards right side)
It is clear from the question that the two forces are acting in the same direction, so the box will accelerates.
Total force(F) = 7+7 = 14N.
According to Newtons II law F=m.a
14 = 10 × a
a = 1.4 m/s2
The box accelerates with 1.4 m/s2
in Which medium would sound travel the fastest,water at 10 degrees Celsius or water ar 25 degrees Celsius?
Sound travels faster in water at 10 degrees Celsius compare to water at 25 degrees Celsius.
What is mechanical wave?An oscillation of matter known as a mechanical wave is what is responsible for the transmission of energy via a medium.
The transmission medium sets a restriction on how far a wave can travel. In this instance, there is almost little translational motion and the oscillating material rotates around a fixed point. The measurement of mechanical waves, which is determined by displacement divided by wavelength, is one intriguing aspect of them.
Sound is a mechanical waves whose speed is depends on the density of the medium. As water at 10 degrees Celsius is denser than water at 25 degrees Celsius, sound travels faster in water at 10 degrees Celsius compare to water at 25 degrees Celsius.
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what is the measurement of how fast an object moves relative to a reference point?
The measurement of how fast an object moves relative to a reference point is speed, or motion. Hope this helped:)
Final answer:
The measurement of an object's speed relative to a reference point is termed relative speed, which all observers can agree upon when accounting for distance and elapsed time. High-speed measurements can vary due to relativistic effects such as length contraction. Velocity includes both speed and direction of motion.
Explanation:
The measurement of how fast an object moves relative to a reference point is known as relative speed. This concept is crucial because the measurement of speed depends on the observer's frame of reference. When determining the relative speed of an object, both the distance the object travels and the time it takes to cover that distance are taken into consideration. The equation for relative speed is the distance traveled divided by the elapsed time, which all observers can agree upon, regardless of their individual motion.
Another important factor to consider at high speeds, especially those approaching the speed of light, is how these measurements can differ due to relativistic effects. According to the theory of relativity, as described by the equation 1 - v²/c², an observer at rest would perceive the length of an object moving at speeds close to the speed of light as significantly shortened. This length contraction affects how distances and, consequently, speeds are measured.
In the context of everyday speeds, we often discuss velocity, which is the speed of an object with the direction of its motion considered. If an object is said to have a speed of 50 mph, that's its scalar magnitude. However, if that object is moving northeast at 50 mph, its velocity is defined, combining both magnitude and direction.
A centrifuge was used to separate into it’s components. What conclusions out the sample can be formed based on the technique used?
A centrifuge is used to separate specimens of different densities. It applies a centripetal force to cause the denser components to separate from the less dense ones. This technique can be used for various purposes, including cell fractionation and separating bacteria, viruses, and proteins based on their density.
Explanation:A centrifuge is a rotating device used to separate specimens of different densities. It operates by applying a centripetal force, which causes the denser components to separate from the less dense components. Based on the technique used, one can conclude that the sample was separated into its components based on differences in density.
For example, in the case of cell fractionation, a centrifuge can be used to separate subcellular structures by differences in mass. The more massive structures settle at the bottom of the centrifuge tube first, while the less massive ones remain suspended for longer. This allows for the isolation and analysis of different organelles and cellular substructures to determine their functions.
In other applications, such as in the separation of bacteria, viruses, and proteins, a centrifuge can separate these components based on their density. The heavier components settle at the bottom while the lighter ones remain suspended. This enables the isolation and study of these components individually.
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Compare how pressure and temperature change with depth inside Earth.
Pressure increases with depth inside Earth due to the weight of the fluid above, and temperature also increases as you go deeper, due to the Earth's internal heat and geothermal gradient.
Explanation:In a fluid, pressure increases with depth. This is due to the weight of the fluid above pushing down on the fluid below. As you go deeper inside the Earth, both pressure and temperature increase. The increase in pressure is due to the weight of the Earth's layers above, while the increase in temperature is a result of the Earth's internal heat and the geothermal gradient.
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What is the minimum body mass index for obesity
Answer:
30.1
Explanation:
The BMI classify people in underweight, normal weight, overweight and obesity, based exclusively on the individual's mass and height. The following classification are commonly accepted: underweight below 18.5 [tex]\frac{kg}{m^2}[/tex], normal weight: 18.5 to 25, overweight: 25 to 30 , obese: more than 30.
Edson exercises in sets that are each t minutes long. He does 6 sets of push-ups, 3 sets of pull-ups, and 4 sets of sit-ups. Use an expression to represent the time it takes Edson to exercise as the sum of three different terms. Simplify the expression. Enter your answer in the box. The time it takes Edison to exercise is equal to t.
edson takes 130 minutes of exersise
step by step answer:
10 x 13 = 130
Answer:
The expression would be 13t.Explanation:
We know that:
Each set takes t minutes to be done.Edson does three types of exercises with different sets: 6, 3 and 4.Basically, we have to multiply each set by t minutes.
We have:
6 sets of push-ups: t + t + t + t + t + t = 6t3 sets of pull-ups: t + t + t = 3t4 sets of sit-ups: t + t + t + t = 4tThe total amount of time considering all sets is 6t + 3t + 4t = 13t. In other words, Edson did 13 sets, if one set takes t minutes, then the 13 sets takes 13t minutes.
if you have a 1.5 L container of tea and the label state that the container contains 1.2 g of sugar grams of sugar what's the concentrated of sugar in the tea
Given data
mass of solute (m) = 1.2 g ,
Volume of solution = 1.5 L ,
= 1.5 × 1000 mL
= 1500 mL ,
What is the concentration of solution = ?
concentration = (mass of solute) ÷ (100 mL of solution)
= (1.2) ÷ (1500 mL of solution)
Note: remember to divide both numerator and denominator by 15 to get concentration per 100 ml
Therefore concentration = 0.1 /100 mL ;
The concentration of sugar in a tea is 0.1/100 mL
If calvin pushes a lawnmower 20 meters with a force of 2n. how much work has he done?
Answer:
40 Joules
Explanation:
Work done is directly proportional to force and displacement. Use this formula to determine the work:
(work) = (force) x (displacement) = (2 N) x (20 m) = 40 Joules
Satellite A orbits the earth at a height 2.00 times the earth's radius.Satellite B orbits the earth at a height 3.00 times the earth's radiusWhat is the ratio of the period of Satellite B to the period of Satellite A?
Answer:[tex]\sqrt 3 :\sqrt 2[/tex]
From Kepler's law: The cube of radius of the orbit of satellite is proportional to square of time period of orbit.
[tex]r^3=\frac{T^2 Gm}{4\pi ^2}[/tex]
where, r is the radius of the orbit of satellite, T is the time period of satellite, G is the gravitational constant, m is the mass of the planet.
R is the radius of Earth.
[tex]\frac{r_A^3}{r_B^3} = \frac{T_A^2}{T_B^2} \\ \Rightarrow \frac{2R}{3R}=\frac{T_A^2}{T_B^2} \Rightarrow \frac{T_B}{T_A}=\sqrt{\frac{3}{2}} [/tex]
Hence, the ratio of the period of Satellite B to the period of Satellite A is [tex]\sqrt 3 :\sqrt 2[/tex]
Final answer:
The ratio of the period of Satellite B to the period of Satellite A is approximately 1.89.
Explanation:
In order to calculate the ratio of the periods of Satellite B to Satellite A, we need to understand that the period of a satellite is related to the radius of its orbit. According to Kepler's third law, the square of the period of a satellite is directly proportional to the cube of the radius of its orbit.
Let's define the radius of Earth as R and the radius of Satellite A's orbit as RA. From the given information, RA = 2R and the radius of Satellite B's orbit as RB = 3R.
The ratio of the periods can be expressed as:
(TB/TA)² = (RB/RA)³
Substituting the values, we get:
(TB/TA)² = (3/2)³ = 27/8
Taking the square root of both sides, we find:
TB/TA = [tex]\sqrt{(27/8)}[/tex] ≈ 1.89
A race car starting from rest accelerates uniformly at a rare of 4.90 meters per second^2. What is the cars speed after it has traveled 200 meters?
From the law of Galileo Galilei :v²=v₀²+2ad we take the speed
v²=0+2*4.90*200=1960=>v=√1960=44.27 m/s
determine which of the following must change when pitch gets higher a.amplitude b.frequency c.wavelength d.intensity e.speed of sound waves
Higher pitch means higher frequency.
But higher frequency also means shorter wavelength, because the product of (frequency) x (wavelength) is the wave-speed, so it doesn't change.
So (b) and (c) must both change.
Answer:
Th Correct Answer is C
Explanation:
Changing Pitch
The four characteristics of the series that influence its frequency are density, diameter, tension, and length. These characteristics are illustrated below: While the length of a sequence is modified, it will reverberate with a distinct wavelength. Lower strings have a greater frequency and therefore more powerful pitch.Define the term “force”.
Energy that is applied to an object.
--TheOneandOnly003
The Jedi have the force. it flows through all things. Joking it will change the motion of an object
Put these different types of radiation in order from MOST to LEAST penetrating.
Answer:
Alpha
These are fast moving helium atoms. They have high energy, typically in the MeV rangeDue to their large mass, they are stopped by just a few inches of air, or a piece of paper.Beta
These are fast moving electrons. They typically have energies in the range of a few hundred keV to several MeV.Gamma
These are photons, just like light, except of much higher energy,They are typically from several keV to several MeV. X-Rays and gamma rays are really the same thing, the difference is how they were produced.Answer: NO, IT'S GAMMA, BETA, THEN ALPHA
Explanation:
rays traveling parallel to the principle axis of a concave mirror will reflect out through the mirrors focus?
a. true
b. false
Answer:
True
Explanation:
When a ray travelling parallel to the principle axis of a concave mirror then the light ray reflect out through the mirrors and passing through the focus.
When a light ray travelling through focus of a concave mirror then after reflection the light ray reflect out through the mirror and go parallel to principle axis.
Therefore, rays travelling parallel to the principle axis of a concave mirror will reflect out through the mirrors focus.
It is true.
Answer:
true
Explanation:
Physic pressure chapter
A spring with k = 500 N/m stores 704 J. How far is it extended from the equilibrium position
Given that:
k = 500 n/m,
work (W) = 704 J
spring extension (x) = ?
we know that,
Work = (1/2) k x²
704 = (1/2) × 500 × x²
x = 1.67 m
A spring stretched for 1.67 m distance.
Differentiate between the factor(s) that affect inertia and momentum.
Answer:
Inertia relates directly to an object's mass. It is its inherent property and expresses how much force is needed to bring the object to a certain level of acceleration. It is the sole factor.
Momentum relates proportionally to two factors: mass and velocity. As such, momentum is not an inherent property of an object but a measure dependent on it current velocity, in addition to its mass.
Answer:
Inertia relates directly to an object's mass. It is its inherent property and expresses how much force is needed to bring the object to a certain level of acceleration. It is the sole factor.
which of the following is not a popular surface for a tennis court?
A. wood
B. grass
C. clay
D. Hard court
The answer is A. wood
because there are three different courts: clay court, grass court, and hard court. wood isn't in there so that would be the answer.
The least popular surface for a tennis court amongst the options given is wood. This is due to its high maintenance, cost, and potential for injuries.
Explanation:In the context of tennis courts, the most commonly used surfaces are grass, clay, and hard court. These surfaces are popular due to their specific impacts on the speed, spin, and bounce of the ball, thus influencing the style of play. On the other hand, wood is not a popular or commonly used surface for a tennis court. While it is possible to play tennis on a wooden court, the maintenance and cost, coupled with the potential for injuries due to slippery surface, make it an impractical option.
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Discuss the advantages and disadvantages of series circuits compared to parallel circuits. Give an example of where each type of circuit could be used.
Advantage of series circuit :
1. allows all the components in the circuit to have same current flowing through them.
2. one switch is enough to turn off all the components in the circuit in series.
3. make the circuit small by using smaller length of wire.
Disadvantages of series circuit :
1. If one component becomes defective , it does not allow other components to operate, since they share same current.
2. all components can not have same voltage across them.
The two waves shown here are the same distance from point X and are traveling toward each other.
What is the amplitude of the resulting wave when the two waves meet at point X?
0.0 cm
1.0 cm
2.0 cm
4.0 cm
Figure missing to find amplitude
Here I try to explain, to find amplitude.
It is the maximum displacement of the wave. The resultant amplitude of two inferring waves is equal to sum of those two waves displacements at the same location. If they are in opposite direction destructive inference occurs.
Answer:
The answer to your question is 0.0 cm
A 50kg Cheetah has a kinetic energy of 18,000J. What is its velocity?
The velocity of a 50kg cheetah with a kinetic energy of 18,000 J is approximately 26.83 m/s, calculated using the formula for kinetic energy = 1/2 * m * v^2.
Explanation:The question concerns the relationship between the kinetic energy, mass, and velocity of an object, specifically a 50kg cheetah. Kinetic Energy is given by the formula 1/2 * m * v^2, where m is the mass and v is the velocity. Specifically, in this scenario, the kinetic energy of 18,000 J (Joules) equals 1/2 * 50 kg * v^2 . Solving this equation for velocity, we have v = sqrt((2 * Kinetic Energy) / m) = sqrt((2 * 18000) / 50) = sqrt(720) ≈ 26.83 m/s. Therefore, the cheetah's velocity would be approximately 26.83 meters per second.
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The electromagnetic waves that have the lowest frequencies are called a. radio waves. c. ultraviolet waves. b. microwaves. d. x-rays. Please select the best answer from the choices provided A B C D
the answer to that would be radio waves which would be answer A
what type of motion does an object traveling in a horizontal vector have?
Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed. Hope you find this helpful
True or false: Balanced forces can change an object's direction?
The statement is false. Balanced forces can NOT change the speed OR direction of an object's motion. (See Newton's #1 law of motion.)
Answer:
False
Explanation:
As per Newton's first law of motion, an object will not change its state of motion until an external unbalanced force is applied on it.
If a balanced force is applied on an object there will be no change in state of motion. Take for example a box. One person moves it to left with force F and another person moves it to the right with same force F. The box will not move. But if the two forces are not equal then a net force will be acting on the box and it will move and its direction will be changed.
which color had shortest wavelength
the color violet has the shortest wavelength!
Answer: Violet! :D
Have a nice day :3
A boy throws a water balloon at his friend. If the work done on the balloon is 20j and it has a mass of 1kg what is the speed of the balloon
Answer:
The speed of of the balloon is about 6.32 m/s
Explanation:
Assuming all of the work done is transformed into the balloon's kinetic energy, we can use the formula for the kinetic energy to answer the question:
[tex]E_k=\frac{1}{2}mv^2\\20J = \frac{1}{2}1kg\cdot v^2\implies v=\pm\sqrt{40\frac{m^2}{s^2}}\approx\pm6.32\frac{m}{s}[/tex]
Speed is the absolute value of velocity, so the speed of the balloon is about 6.32 m/s
2in+3in+4in+4in+6in+7in calculate the area and perimeter of each shape
Answer:
Let "a", "b" and "с" be sides of the triangle ("с" is the longest side).
The triangle will be:
right if a² + b² = c²
аcute if a² + b² > c²
obtuse if a² + b² < c²
a.
a=3, b=4 and c=5
a² + b² = 3² + 4² = 9 + 16 = 25 and c² = 5² = 25
25 = 25 ⇒ right triangle.
b.
a=5, b=6 and c=7
a² + b² = 5² + 6² = 25 + 36 = 61 and c² = 7² = 49
61 > 49 ⇒ аcute triangle.
c.
a=8, b=9 and c=12
a² + b² = 8² + 9² = 64 + 81 = 145 and c² = 12² = 144
145 > 144 ⇒ аcute triangle.
2) In order to generate electricity from mechanical energy, one essential element needed to transform the energy into electrical energy is
Answer:
In order to generate the electricity from mechanical energy, the generator is needed.
The generator, which converts Mechanical energy in to Electrical energy, by magneto induction, which is when voltage induced by change in magnetic field.
A 10n force is applied to a 25kg mass to slide it across a frictional surface. What is the acceleration of the mass?
Force (in Newtons) equals mass (in kilograms) times acceleration (in meters per second squared).
Plug in the given force and mass to the equation and solve for acceleration:
10=25a
0.4m/s2=a
Hope this helps!!
Answer: a = 0.4m/s^2 - 9.8*c where c is the coefficient of kinetic friction of the surface
Explanation: We know that, by the second Newton's law, a = F/m
where a is the acceleration, F is the net force and m is the mass of the object.
Then, if the surface is frictionless, the total force applied in the object is 10N, and the mass of the object is 25kg, so the acceleration is:
a =10N/25kg = 0.4m/s^2.
But if the surface is frictional, there will be a force of friction applied in the mass (this depends on the coefficient of friction and the weight of the mass), this means that the acceleration will be reduced.
If = -(9.8*25)*c
where c is a number that is bigger than 0 and smaller than 1, is called the coefficient of kinetic friction.
So the total force is now:
F = (10 - 9.8*25*c)
Then, the acceleration in a frictional surface is equal to:
a = (10 - 9.8*25*c)/25 = 0.4m/s^2 - 9.8*c