Physics High School

38.A student heard the echo of his voice from a nearby solid object after 2se. How far away
is the solid object? The speed of sound in air is 170m/s.
A. 85m
B. 170m
C. 300m
D. 340m

Answers

Answer 1

Answer:

B. 170m

Question explained in the photo attached

Hope it helped : )

38.A Student Heard The Echo Of His Voice From A Nearby Solid Object After 2se. How Far Awayis The Solid

Related Questions

What phase in running is determined when the foot and leg serve as shock absorber, before the foot hits the ground, and the knee flexes ?

Answers

Answer:

it is the stance phase of running where the foot and leg serve as shock absorber

the moon revolves around the earth in a
nearly circular orbit kept tere by the gravitational force exerted by the earth what does the gravity do?

Answers

Answer:

Gravity does no work on the Moon

Explanation:

On average, how many lunar eclipses are there every year?.

Answers

Answer:

Three lunar eclipses every year.

Explanation:

A lunar eclipse only occurs during a full Moon, when the Sun, Earth and Moon are all aligned. But despite the Moon only taking 29.5 days to orbit Earth and complete a cycle from full Moon to full Moon, there are only on average about three lunar eclipses every year.

According to current scientific estimates, when did the big bang occur?.

Answers

Answer:

13.8 billion years ago

Explanation:

PLEASE HELP!!
A toy truck has a speed of 2 m/s and kinetic energy of 30 J. What is its mass?

A. 10 kg
B. 15 kg
C. 5 kg
D. 20 kg

Answers

I think the answer is B

Identifying Independent and Dependent Variables in Experiments

Answers

Answer:

The easiest way to identify which variable in your experiment is the Independent Variable (IV) and which one is the Dependent Variable (DV) is by putting both the variables in the sentence below in a way that makes sense.

“The IV causes a change in the DV. It is not possible that DV could cause any change in IV.”

Explanation:

A car that weighs 40,000 N is driving down a hill at a constant velocity. If the car’s momentum is 80,000 kg∙m/s, how fast is the car moving?

Answers

The velocity of the car is equal to 20 m/s.

Given the following data:

Weight of car = 40,000 Newton.Car’s momentum = 80,000 kg∙m/s.

Scientific data:

Acceleration due to gravity = 10 [tex]m/s^2[/tex].

To determine the velocity of the car:

How to determine the car's velocity.

First of all, we would calculate the mass of the car by using this formula:

[tex]Weight = mg\\\\40000=m \times 10\\\\m=\frac{40000}{10}[/tex]

Mass, m = 4,000 kg.

For the velocity:

Mathematically, momentum is giving by this formula;

[tex]Momentum = mass \times velocity[/tex]

Making velocity the subject of formula, we have:

[tex]Velocity = \frac{Momentum}{Mass}[/tex]

Substituting the given parameters into the formula, we have;

[tex]Velocity = \frac{80000}{4000}[/tex]

Velocity = 20 m/s.

Read more on momentum here: brainly.com/question/15517471

Box is kicked (given an initial speed), causing it to slide along a level floor. There is friction acting between the box and floor surfaces. What is true about this motion

Answers

Answer:

I would assume that the box slows down due to the frictional force between the floor and the box. In addition, the frictional force points opposite of the boxes motion. As we know, the box was given an initial speed, therefore, having an applied force. Hence, we can conclude that  the frictional force opposing the motion of the crate is equal to the applied force but acting in the opposite direction. This frictional force is called static friction. When we increase the applied force (push harder), the frictional force will also increase until it reaches a maximum value.

Hope that helps!

A billiard ball collides with another billiard ball, transferring all of its kinetic energy. What will happen after the collision

Answers

Answer: If the cue ball strikes a stationary billiard ball straight on, then the cue ball will stop moving after the collision. It will have transferred all of its kinetic energy to the other ball, which will move forward with the same velocity that the cue ball had before the collision.

Explanation:

You and your team of expert engineers are to improve the safety of a section of highway roadway. This is a flat concrete road surface. It is used both by passenger cars (1200 kg) and trucks ( 36,000 kg). The present velocity limit is 15.64 m/s and the radius of turn is 110 m.
The Normal force of each vehicle.

Answers

The normal force of the passenger cars is 11,760 N.

The normal force of the trucks is 352,800 N.

What is normal force?

The normal force of an object is the upward force of the object due to its weight acting downwards.

The normal force of the passenger cars

The normal force of the passenger cars is calculated as follows

Fₙ = mg

Fₙ = 1200 x 9.8

Fₙ = 11,760 N

The normal force of the trucks

The normal force of the trucks is calculated as follows;

Fₙ = mg

Fₙ = 36,000 x 9.8

Fₙ = 352,800 N

Learn more about normal forces here: https://brainly.com/question/14486416

If thermal energy is added to a liquid, what is the most likely thing that will happen to the substance?

Answers

Explanation:

When thermal energy is added to a substance, its temperature increases, which can change its state from solid to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation).

name an object that contains all 7 energies, and where those energies are shown.

Answers

Answer:

I don't know what energy is there I think you need to check in you book or note dear

Explanation:

hope you will understand

[tex]kai6417[/tex]


At which point is potential energy greatest?

Answers

Answer:

when the most energy is stored

Humans selectively breed cows that produce more meat or milk. This selection is not necessarily helpful
to increase their survival rate. They are just selecting a desirable characteristic. How can growing one
variety affect cows population over many generations?


There will be less genetic diversity in the population.


The cows will produce less milk or less meat over generations.


The cows will be able to survive for a longer time.


There will be more genetic diversity in the population.

Answers

Answer:

The cows will produce less milk or less meat over generations.

Who was the highest deity in the Shang religion?
A.
Di
B.
Laozi
C.
Shihuangdi
D.
Confucius

Answers

Who was the highest deity in the Shang religion?

A. Di

Answer:

Shangdi or A: Di

Explanation:

Shangdi was considered to be the supreme deity during the Shang dynasty (1600–1046 century BCE), but during the Zhou dynasty (1046–256 BCE) he was gradually supplanted by heaven (tian).

What is the new velocity of a 1140 kg car that was traveling at 13.6 m/s and slams on the brakes losing 5000J of energy?

Answers

Answer:

13.3 m/s

Explanation:

KE = 1/2 m • v^2

KE = 1/2 • 1140 kg • (13.6m/s )^2

KE = 105427.2 J

KE after brakes are slammed = 105427.2 J - 5000 J

KE after brakes are slammed = 100427.2 J

100427.2 J = 1/2 • 1140 • v^2

v = (100427.2 J • 2 / 1140 kg)^1/2

v = 13.3 m/s after adjusting for significant figs

Which phenomenon do solar panels rely on to produce electricity from sunlight?

Answers

Answer:

When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

Answer:

When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

Explanation:

What is the momentum of a golf ball with a mass of 62 g moving at 73 m/s?

Answers

Explanation:

Momentum = mass × Velocity

p = 62×73

p =4526

Mr Hules is making cookies for his family. A recipe for 24 cookies calls for 4 cups of sugar for every 6 cups of flour. How many cups of flour will he use if he needs to make 60 cookies?



I need the step by step process to

Answers

Answer:

15 cups of flour to make 60 cookies

Explanation:

first, do 60 divided by 25.

then we MULTIPLY the recipe by 2.5

24x2.5=60 amount of cookies

4x2.5=10 cups of sugar

6x2.5=15 cups of flour

15 cups of flour to make 60 cookies

:DDD

Answer:

15 cups of flour

Explanation: 60 times 6 = 360

24x=360

360 divided by 24 is 15.

If the truck has a mass of 2,500 kilograms , what is its momentum ? (V=45m/s) Express your amswer

Answers

Answer:

The answer is 2,500 * 45 = 112500kgm/s

Help a brother out pleaseeeeew

Answers

Changes in energy my brother

Calculate the acceleration if you push with a 6 N horizontal force on a 8 kg block on a
horizontal friction free air table.

Answers

a=f/m=6N divide 8kg=0.75m/s*2 to horizontal air table

How far will an object go if it is moving at a speed of 55 km/hr, and moves for 6.3 hours?

Answers

Answer:

346.5 km

Explanation:

to find distance- multiply speed by time

so 55×6.3= 346.5 km

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An insulated lunch bag keeps food warm by

increasing the thermal energy of the lunch bag.
increasing the thermal energy of the food.
slowing the transfer of thermal energy from the air outside the bag to the food inside the bag.
slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.

Answers

Answer:

slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.

Explanation:

Answer:

D

Explanation:

slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.

What exerts pressure in all directions?

Answers

Answer: Gases

Explanation: Gases don't have a certain direction, so they go in all directions.

A toy car has a 1. 5 A current, and its resistance is 2 Ω. How much voltage does the car require? V.

Answers

Answer: Voltage = (current) x (resistance)

Voltage = (1.5 A) x (2 ohms)

In order to MAKE 1.5 A of current flow through the toy car, you have to PROVIDE 3 volts from the battery.

How far is one light-year in kilometres? Answer to 2sf.

Answers

Answer:

9.461 trillion kilometers

A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filling clinging to the?

(a) North pole is almost equal to the south pole.
(b) North pole is much more than the south pole.
(c) North pole is much less than the south pole.
(d) Magnet will be same all along its length.

Answers

Answer:

(a) North pole is almost equal to the south pole.

Explanation:

A pendulum is observed to complete 23 full cycles in 58 seconds. Determine the period and
the frequency of the pendulum.
1

Answers

Answer:

Frequency=0.39Hz

Explanation:

A pendulum completes 23 full cycles in 58 seconds

A pendulum completes 1 full cycle in 58/23=2.52 seconds

Time taken(t)=2.52 seconds

Now,

Frequency=1/time taken

Frequency=1/2.25

Frequency=0.39Hz

When a pendulum is observed to complete 23 full cycles in 58 seconds. then the period is 2.521739 and the frequency of the pendulum is  0.39655 S⁻¹

What is the frequency?

It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.

The frequency of a pendulum is the reciprocal of the time period can be given by the following relation

f = 1/T

where f is the frequency

T is the time period  of the pendulum

As given in the problem that a pendulum is observed to complete 23 full cycles in 58 seconds

Then the number of cycles per second is known as the frequency

f = 23/58

f = 0.39655 S⁻¹

As the time period is reciprocal to the frequency

T= 1/f

T = 1/0.39655

T =2.521739

Thus, if 58 seconds pass before a pendulum completes 23 full cycles. then the pendulum's frequency would be  0.39655 S⁻¹, and its period would be 2.521739.

Learn more about frequency from here

brainly.com/question/14316711

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a sound wave coming from a ringing telephone have a frequency of 226 Hz and it’s wavelength is 2 m. what is the speed of the sound wave.

Answers

Answer:

I think this is simple division of the sound wave and the hertz at the same time.

Explanation:

I think you should maybe divide by 2

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