Answer:
343 m/s
Explanation:
The velocity of sound in dry air varies with temperature as:
v ≈ 331.4 + 0.6 T
where v is velocity in m/s and T is temperature in degrees Celsius.
At 20°C:
v ≈ 331.4 + 0.6 (20)
v ≈ 343.4
So the sound traveled at approximately 343 m/s.
How is an image produced by a plane mirror different than an image produced by a convex mirror?
A It is smaller than the object.
B It is the same size as the object.
C It is inverted
D It is upright.
Answer:
it is the same size as the object ( B )
Explanation:
An image formed/produced by a plane mirror is different than an image produced by a a convex mirror because image produced by a plane mirror appears the same size as the object while the image produced by a convex mirror does not appear is smaller than the object.
images produced by a convex mirror is usually smaller than the original object, they are upright and they are virtual. they also seem to appear behind the convex mirror. while plane mirror produce images of same size as the object.
SOMEONE PLS HELP ME ASAP!!!!!!!!!!
Answer:
Greatest-A Middle-B Last-C
Which circuit-A or B-represents a series circuit? Explain your answer.
Circuit-A is a series circuit. There's only one road that electrons can take to get from one battery terminal to the other one. There's no point in the circuit where an electron has to decide which path to take.
Circuit-B is a parallel circuit. At each of the two 'dimples' across the top, an electron has a choice: It can turn right and go through a bulb, OR keep going straight on to the NEXT bulb.
Circuit-C is a series circuit. There's only one road that electrons can take to get from one battery terminal to the other one. There's no point in the circuit where an electron has to decide which path to take.
Circuit-D is called a "series-parallel circuit", because it has characteristics of both kinds. Devices #2 and #3 are in parallel, but Device #1 is in series with them.
Circuit-E is a parallel circuit. There are two places across the top where an electron has a choice: It can decide to take a right turn and go through the bulb OR keep going straight on to the next bulb.
How are uniform circular motion maps the same as linear motion maps? Check all that apply.
Time is represented by dots at 1-second intervals.
Start position is represented by an x.
Velocity vectors change length as the object’s speed changes.
Velocity vectors change direction as the object’s direction changes.
Acceleration vectors always point in the same direction.
Answer:
Time is represented by dots at 1-second intervals.
Velocity vectors change direction as the object’s direction changes.
Explanation:
I just did the problem and got it right! :)
The acceleration of circular path is continuous and the direction of the acceleration is inward.
Time is represented by dots at one second intervals. Velocity vectors change direction with change of the object’s direction.Circular motion:
It is the motion of an object in the circular path at constant velocity.
Velocity if the circular path is constant and the direction of velocity is tangent to the object' motion.
The acceleration of circular path is continuous and the direction of the acceleration is inward.
Therefore, for uniform circular motion maps, time is represented as the dots of one second intervals.
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What is the efficiency of an engine that does 20 J of work and exhausts 80 J
of heat while taking in 100 J of heat? Use e=
Wtotal/ Qin
A. 80%
B. 10%
C. 20%
D. 25%
(PLEASE HELP NEED ANSWER ASAP)
Efficiency =
(energy coming out that does what you want)
divided by
(total energy you put in).
= = = = = = = = = =
Efficiency = (20 J) / (100 J)
Efficiency = 20/100
Efficiency = 0.20
Efficiency = 20% (C)
Engine's efficiency is the ratio of the work done by the engine and heat absorbed by it. The efficiency of the given engine is 20%.
Engine efficiency:[tex]E = \dfrac {W}{q}\times 100[/tex]
Where,
[tex]E[/tex]- efficiency
[tex]W[/tex] = work done by engine = 20J
[tex]q[/tex] - energy absorbed by engine = 100 J
Put the values in the formula,
[tex]E = \dfrac {20}{100}\times 100\\\\E = 20\%[/tex]
Therefore, the efficiency of the given engine is 20%.
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Which is an example of radiation? Check all that apply. Troy’s hand is burned when he touches hot wax. Earth is heated by energy from the Sun. A hot dog is held over a fire and gets warm. Soup is heated in a microwave. Water is boiled in a pot on a stove burner.
Answer:
Earth is heated by energy from the Sun.
Explanation:
This is correct on edge.
Radiation examples: Earth heated by Sun's energy, soup microwaved. Other options involve conduction or convection, not radiation.
Radiation refers to the transfer of heat energy through electromagnetic waves. Based on the given options, the examples of radiation are:
Earth is heated by energy from the Sun.
This is an example of radiation because the Sun emits heat energy in the form of electromagnetic waves, which travel through the vacuum of space and reach Earth, warming it in the process.
Soup is heated in a microwave.
Microwaves use electromagnetic radiation to heat food. Microwaves are a form of electromagnetic waves, and they directly heat the water molecules inside the food, causing it to heat up.
Water is boiled in a pot on a stove burner.
This is also an example of radiation. When the stove burner heats the pot, the pot, in turn, heats the water through the process of conduction, but there is also radiation involved. As the pot gets hot, it emits infrared radiation, which further heats the water.
The other examples mentioned (Troy's hand being burned, hot dog getting warm over a fire) involve conduction and convection, not radiation.
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Ohm's Law Problems
1. If you have a circuit with a 50V battery and a 10 OHMS resistor what is current through the
circuit?
Answer:
The current through the circuit is 5A
Explanation:
Ohm's Law
The intensity of current through a circuit is directly proportional to the voltage or voltage of the same and inversely proportional to the resistance it presents.
[tex]I=\frac{V}{R}[/tex]
Where I is the intensity that is measured in amperes (A), V the voltage that is measured in volts (V); and R the resistance that is measured in ohms (Ω).
With a 50V battery and a 10Ω
[tex]I=\frac{50V}{10ohms}=5A[/tex]
A weather balloon is operating at an altitude at which the density of air is 0.90 kg/m^3. At this altitude, the balloon has a volume of 20m^3 and is filled with helium (density of helium is 0.178 kg/m^3). If the balloon skin weighs 88 N, what load can be supported at this level?
Answer:
54 N
Explanation:
Draw a free body diagram. There are four forces acting on the balloon. Buoyant force pushing the balloon up, gravity pulling the helium down, gravity pulling the balloon skin down, and gravity pulling the load down.
Apply Newton's second law:
∑F = ma
B − Wh − Wb − L = ma
When the load is at a maximum, the acceleration is 0:
B − Wh − Wb − L = 0
B − Wh − Wb = L
B − mh g − Wb = L
The mass of the helium is its density times its volume:
B − ρh Vh g − Wb = L
Buoyant force is defined as B = ρVg, where ρ is the density of the displaced fluid (in this case, air), V is the volume of the displaced fluid, and g is acceleration of gravity. Since the volume of displaced air = the volume of the helium:
ρa V g − ρh V g − Wb = L
(ρa − ρh) V g − Wb = L
Given that ρa = 0.90 kg/m³, ρh = 0.178 kg/m³, V = 20 m³, g = 9.8 m/s², and Wb = 88 N:
(0.9 − 0.178) (20) (9.8) − (88) = L
L = 53.5 N
Rounded to 2 sig-figs, the maximum load that can be supported is 54 N.
Today, most classification systems place bacteria in the kingdom
a. Monera
b. Plantae
c. Animalia
d. Fungi
Today, most classification systems place bacteria in the kingdom
a. Monera
What do radio waves and microwaves have in common?
A) Both have higher frequencies than visible light
B) Both are located next to visible light on the spectrum.
C) Both are located to the right of visible light on the spectrum
D) both have shorter wavelengths than visible light
Answer: C) Both are located to the right of visible light on the spectrum
Explanation:
BECAUSE....
Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They travel with the speed of light.
Both radio and microwaves are electromagnetic waves which are adjacent to each other in electromagnetic spectrum towards lower frequency and higher wavelength.
The relationship between wavelength and frequency of the wave follows the equation:
[tex]\nu=\frac{c}{\lambda}[/tex]
where,
v = frequency of the wave
c = speed of light
[tex]{\lambda}[/tex]= wavelength of the wave
* Hopefully this helps: ) Mark me the brainliest:)!!
~234483279c20~
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡⊕
Answer:
C.) Both are located to the right of visible light on the spectrum
↓↓↓
Explanation:
Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They travel with the speed of light.
Both radio and microwaves are electromagnetic waves which are adjacent to each other in electromagnetic spectrum towards lower frequency and higher wavelength.
The relationship between wavelength and frequency of the wave follows the equation:
where,
v = frequency of the wave
c = speed of light
= wavelength of the wave ↑↑↑
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡⊕
Hope I helped!!! ∞
~Nuha
<3
Any help is appreciated!
Answer:
a
Explanation:
Which action can be explained by physics?
A.
the growth of fungus on a piece of bread
B.
the mixing of sodium and chlorine to form common salt
C.
the interactions between predators and prey in an ecosystem
D.
the pressure of blood exerted on the inner walls of the veins
Answer:
d
Explanation:
i got it correct on my test
—Second law of newton
Where did the “2a” come from in the first equation?
I know that Frictional force is equal to “Normal force x Coeficient of friction” but the problem is with that number 2 on left side.
Answer:
Explanation:
They substituted the value of M₁.
∑F = ma
M₁ a = T₁ - F
M₁ a = T₁ - Nμ
M₁ a = T₁ - M₁g μ
Given that M₁ = 2, g = 9.81, and μ = 0.25:
(2) a = T₁ - (2) (9.81) (0.25)
HELP ASAP! GIVING BRAINLIEST
When a pendulum hits a metal lid or pan, what forms of energy can you identify?
Kinetic energy
When the pendulum hit the metal lid or pan it shakes
The largest source of available freshwater on Earth is _____.
lakes
rivers
aquifers
ice caps
Answer:
The correct answer is ice caps.
Explanation:
Ice caps are the largest source of available freshwater on Earth; especially in Antarctica.
Answer:
ice caps is the correct answer.
Explanation:
The largest source of available freshwater on Earth is ice caps.
Freshwater is a naturally occurring water and concentration of the dissolved salts is low.
Fresh water carries water in ice caps as the largest sources and water in glaciers, ponds, lakes, streams, rivers, ice sheets.
Antarctica contains 90% of the fresh water on the Earth's surface but it is iced in the form of the ice caps.
what zone does earth exist in that potentially allows life on our planet
Answer: goldilock's zone
The zone which allows the potential for life on Earth is the circumstellar habitable zone.
Explanation:
The circumstellar habitable zone is the zone in which Earth exists. This zone allows the Earth to have or support life on the planet. The habitable zone signifies the presence of support system which could lead to pursue life and that is the presence of water and oxygen.
The water needs to be in ample liquid form with a well defined atmospheric pressure. The presence of zone is circumstellar that is determined by the position of the planet in the Solar System.
Which force changes the lithosphere by building up the surface?
volcanic eruptions
weathering
glacial erosion
rockslides
Answer:
volcanic eruptions
Explanation:
The volcanic eruptions are the ones that manage to cause changes to the lithosphere by building up new material on the surface. Through the volcanic eruptions we have release of pyroclastic material on the surface, and more importantly and in much higher amount lava flows. The lava flows quickly cool off on the surface on the Earth, and as they do they pile up new layers of igneous rocks, thus new crust on the surface of the Earth, causing changes on the lithosphere and shaping it for the foreseeable future.
Answer:
A. volcanic eruptions
Explanation:
Newton’s second law of motion addresses the relationship between what two variables that influence the force on a body?
Newton’s Second Law concerns the generation of force based on an object’s mass and acceleration, as described by the equation F=ma.
Hope this helps!
The two variables which influences the body force addressed in “Newton’s second law of motion” s mass and acceleration.
Explanation:
The “Newton’s second law of motion” states that rate of change of momentum is directly in proportional to force applied on body.
[tex]\begin{array}{l}{F \propto \frac{d p}{d t}} \\ {F=m \cdot \frac{d v}{d t}} \\ {F=m \cdot a} \\ {\text { Force }=\text {Mass} \times \text {Acceleration}}\end{array}[/tex]
This is how the Second law of motion is derived in formula by the Newton which establishes the relationship between the two variables which influences the force of the body.
Whats the answer to this question show in the picture 2 questions
Answer: i think it would be watts
What do MRI and ultrasound have in common as diagnostic imaging techniques? Check all that apply.
low risk for tissue damage
uses radio waves
noninvasive
tomographic imaging
no radiation
Answer:
low risk for tissue damage
uses radio waves
the last three are not correct
:)
Answer:
low risk for tissue damage
no radiations
Explanation:
MRI = magnetic resonance Imaging
Ultrasound
These are two process by which we can find the damaged tissues and and their position. These methods are used in medical science and hence these process must be safe to use.
As we know that all electromagnetic radiations are not good for humans as they are of high energy range so here in order to avoid this all we use the phenomenon of resonance to find out the situation of damaged cells or tissues in the body.
So correct answers are
low risk for tissue damage
no radiation
How does energy get into the apple in the first place?
A. The apple absorbs energy from the soil while it is on the tree.
B. The apple absorbs energy from the Sun when it is in sunlight.
C. The apple tree stores energy from the Sun in the apple as sugar.
D. The apple tree stores energy from the soil in the apple as sugar.
Energy enters an apple through photosynthesis, where the apple tree captures solar energy and converts it into chemical energy, storing it as sugar within the apple.
Explanation:The energy gets into the apple primarily through a process called photosynthesis. This process is essential for plants, allowing them to capture solar energy from the sun and convert it into chemical energy, which is stored in the form of sugars like glucose. Thus, the correct answer is: C. The apple tree stores energy from the Sun in the apple as sugar.
Through photosynthesis, plants absorb solar energy and use it to transform carbon dioxide and water into glucose, which is a simple sugar, and oxygen. The energy from the sun is stored in the chemical bonds of the glucose molecules. Later, this energy can be accessed by organisms that consume the plants, including humans when they eat plant products like apples.
Final answer:
Energy enters the apple through the process of photosynthesis, where the apple tree captures solar energy and stores it as sugar in its fruits, such as apples. So the correct option is C.
Explanation:
Energy gets into the apple primarily through the process of photosynthesis. The apple tree uses solar energy from the sun to convert carbon dioxide and water into glucose and oxygen. This chemical reaction captures the radiant energy in sunlight and converts it into stored chemical energy in the form of sugars, such as glucose, which accumulates in the fruits of the plant, including apples. Therefore, the correct answer to how energy gets into the apple in the first place is:
C. The apple tree stores energy from the Sun in the apple as sugar.A(n)
reverses the flow of current through an electric motor.
Answer:
Commutator reverses the flow of current through an electric motor
Explanation:
Answer:
Commutator is a ring which reverse the direction of current in AC circuit so that the coil connected to it will continuous to move in the same direction.
Explanation:
In motors there exist a coil which is rotated due to torque of magnetic field when current flow through it. Since AC current is used to run the motor so we know that AC current changes its direction after half cycle.
So here commutator plays an important role to reverse the direction of current after every half cycle so that the current goes in same direction always into the coil.
This will produce a constant direction torque on the coil so that it will rotate in same sense always.
So commutator role is to provide same direction current to the coil by reversing its direction after every half cycle
Which of these reactions is a combustion reaction. •(A) burning wood. •(B) decomposition of water. •(C) production of food with the help of the suns energy. •(D) rotting of fruits and vegetables
Answer:
(A) burning wood
Explanation:
Burning of wood is the only combustion reaction we have listed among the options.
Combustion is an exothermic reaction in that heat is released to the environment. Combustion usually occurs in the presence of oxygen. In this reaction, a fuel source, the wood reacts with oxygen to produce heat energy and some other products.
Answer:
A. Burning wood
Explanation:
The illustration depicts the formation of an ionic chemical bond between sodium and chlorine atoms. The result of this bonding is a chemical compound that is stable because the A) transferred electron provides chlorine with a full outer energy level. B) shared electron provides both elements with a full outer energy level. C) shared electron provides provides sodium with a full outer energy level. D) transferred electron provides both elements with a full outer energy level.
Answer:
D) transferred electron provides both elements with a full outer energy level.
Explanation:
Ionic or Electrovalent bonds are interatomic bonds that are formed as result of transfer of electrons between two atoms. The more electronegative atom would attract the electron to itself.
Na, sodium has an electronic configuration of 2,8,1 with a Valence electron.
Cl, chlorine is an halogen with an electronic configuration of 2,8,7.
When atoms combines, the goal is to form an octet configuration to mimic those of noble gases.
If Na, loses one electron, it would have a configuration of 2,8 which looks like a Neon atom. This configuration is stable for Na.
If the electron lost is gained by Cl, the configuration becomes 2,8,8 and resembles an Argon atom.
We can see that by the loss and gain of electrons between Na and Cl the atoms attain a stable octet configuration.
The atom Cl has more affinity for the electron. This would leave a net negative charge on its ion.
The electropositive and metallic Na would donate the electron. Its atom would then show a perfect octet of Ne, Neon. This leave a net positive charge on its ion.
Therefore, the bond type between Na and Cl is an Electrovalent bond.
Please, someone help me I'm begging yall 1. it's estimated that 1 kg of body fat will provide 3.8 * 10^7 J of energy. A 67 kg mountain climber decides to climb a mountain 3500 m high. a) How much work does the climber do against gravity in climbing to the top of the mountain? b) if the body's effiency in converting energy stored as fat to mechanical engery is 25% determine the amount of fat the climber will use up in providing the energy required to work against the force
Answer:
0.24 kg used up
Explanation:
He has a mass of 67 kg
The gravitational constant is 9.81 m/s^2
The distance upward is 3500 m
W = m*g*h
W = 67 * 9.81 * 3500
Work = 2,300,445 Joules
Work = 2300 kj
work = 2.30 * 10^6 joules in scientific notation.
Part B
He needs 4 times this amount to climb the mountain because the body is only 25% efficient in converting energy.
4*2.30 * 10^6 = 9.20 * 10^6 Joules of energy are therefore required.
The total amount in a kg of fat = 3.8 * 10^7 joules
x kg of fat is needed to provide 9.20.*10^6 joules
1 kg / (3.8 * 10^7 J ) = x kg / (9.20 * 10^6 J)
9.20 * 10 ^6 * 1 = 3.8 * 10^7 *x
9.20 * 10 ^6 / 3.8 * 10^7 = x
x = 0.24 kg of fat are needed
A bag of books took three minutes to move you did 12,900 day of work how much power it was required to move the bag? A3 187B 7166C 71.66D 2322
Answer:
Power = Work / time
= 12900 J / (3*60)s
≈ 71.667 Watts
Answer:
71.66 watt is the power required to move the bag
Option: C
Explanation:
From the given question, Work done is 12900 J (work is the product of force and displacement) in 3 minutes.
We know that, rate of work done is the power.
[tex]\text { Power }=\frac{\text {work}}{\text {time}}[/tex]
Substitute the given values in the above formula to obtain power required to move the bag.
[tex]\text { Power }=\frac{12900 \mathrm{J}}{3 \times 60 \mathrm{s}}[/tex]
[tex]\text { Power }=\frac{12900 \mathrm {J}}{180 \mathrm {s}}[/tex]
[tex]\text { Power }=71.667 \mathrm{Watt}[/tex] (Joule per second is equal to watt )
Therefore the power required to move the bag is 71.66 watt.
Jenny is very nervous about giving her speech, and when she stands up in
front of the class, she stutters and does a poor job. This is an example of:
Jenny's poor performance in her speech due to nervousness and stuttering is an example of performance anxiety.
Explanation:This situation can be described as a case of performance anxiety, where Jenny's nerves and fear of speaking in front of the class caused her to stutter and perform poorly in her speech.
Performance anxiety is a psychological phenomenon that affects individuals in various situations, including public speaking. It can lead to physical symptoms like stuttering and psychological distress that impairs performance.
To overcome performance anxiety, Jenny can practice her speech beforehand, use relaxation techniques, and seek support from teachers or a speech therapist.
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Jenny's situation of being nervous while giving a speech and performing poorly due to stuttering is an example of performance anxiety. This type of anxiety typically occurs when a person is performing in front of others and can result in physical reactions like stuttering. Methods of mitigating this anxiety include breathing exercises and practice.
Explanation:This situation is an example of performance anxiety, which falls under the Psychology subject. Performance anxiety, or stage fright, often happens when individuals are required to perform in some way in front of others. This might include giving a speech, taking an exam, or playing a sport. When a person, like Jenny, becomes too anxious or nervous, they may have physical reactions like stuttering, sweating, or even forgetting their lines, all symptoms reflected in Jenny's situation.
Jenny's fear likely stems from her perception of the situation, including her expectations of herself and her fear of other people's perceptions. This could create a situation where she performs below her actual ability level. This type of anxiety, while common, can be mitigated with various techniques such as deep breathing exercises, visualization, and practice.
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6. The temperature of a mass of tin increases from 24.0 degrees C to 34.0 degrees C when 250 J of thermal energy are added. Calculate the mass of the tin. The theoretical specific heat capacity of tin is 0.228 J/g degrees C.
Answer:
110 g
Explanation:
q = mCΔT
where q is heat, m is mass, C is specific heat capacity, and ΔT is change in temperature.
Given q = 250 J, C = 0.228 J/g/°C, and ΔT = 10.0 °C:
250 J = m (0.228 J/g/°C) (10.0 °C)
m = 110 g
To find the mass of tin, the formula Q = mcΔT is used, with the given specific heat capacity and the change in temperature. The calculation results in a mass of approximately 109.65 grams for the tin when 250 J of thermal energy raises its temperature by 10°C.
To calculate the mass of the tin when 250 J of thermal energy are added, and its temperature increases from 24.0 degrees C to 34.0 degrees C, we use the formula Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Given that the specific heat capacity of tin (c) is 0.228 J/g°C, and the change in temperature (ΔT) is 34.0°C - 24.0°C = 10°C, we can rearrange the formula to solve for the mass (m).
m = Q / (cΔT) = 250 J / (0.228 J/g°C × 10°C) = 250 J / (2.28 J/g) = 109.65 g (rounded to two decimal places).
The mass of the tin is therefore approximately 109.65 grams.
What is the effective resistance between the points A and D? A) 1.3 Ω B) 2.2 Ω C) 10 Ω D) 12 Ω
Answer:
B) 2.2 Ω
Explanation:
The resistor between B and C is connected in parallel to the resistor between C and D (because their ends are connected to the same points: C on one side and B (which has same voltage as D) on the other side, so they have same potential difference across them.
So their equivalent resistance is
[tex]\frac{1}{R_{BD}}=\frac{1}{R_{BC}}+\frac{1}{R_{CD}}=\frac{1}{4.0 \Omega}+\frac{1}{5.0 \Omega}=\frac{9}{20 \Omega}\\R_{BD}=\frac{20 \Omega}{9}=2.22 \Omega[/tex]
The resistor between A and B, instead, is short-circuited, because the current flows through the upper branch of the circuit (connecting A with C), which has zero resistance (it is a wire without any resistor). This means that the resistor between A and B should not be considered: so, the total resistance of the circuit is
[tex]2.2 \Omega[/tex]
What is latent heat?
Answer:
Hey there!! So the answer is that the heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature. Hope this helped and have a great day!!
Answer:
Explanation:
This is the invisible heat required to change the state of a body either from solid to liquid or from liquid to gas.
Latent heat is not detectable by a thermometer.
There are two types of latent heat
(1) Latent heat of fusion
(2) Latent heat of vaporization
(1) Latent heat of fusion: This is the heat energy required to convert a substance from its solid form to its liquid form without a change in temperature.
(2) Latent heat of vaporization: This is the heat required to convert a substance from its liquid form to vapour without a change in temperature.