How long does it take for the speed of light and sound to travel around the world

Answers

Answer 1

Answer:
-- Light travels straight, not around in a circle. But if it did, it would cover
a distance equal to the length of the equator in about 0.13 second.

-- At the speed of sound (in air at standard temperature and pressure),
it would take about 32.6 hours to cover the same distance.

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How can you calculate distance when given power, time, and mass?Power used to lift crate is 3490, mass of crate is 425 kg, time is 3 seconds. How far was the crate lifted?
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C is wrong ( currently failing ) Please Help

Answers

The answer has the be the fourth option "the object is not accelerating." By looking at the graph you would see the the velocity is constant meaning it staying the same and its not increasing or decreasing which takes out the first, second, and third option. So, since how the velocity is not increasing the object is not accelerating or the fourth option.

Hope this helps!

sense the time shown is increasing but the velocity is neither increasing or decreasing then the answer would have to be D.

If the mass is doubled the kinetic energy will?

Answers

Besides the mass, kinetic energy also depends on speed.

If the speed remains constant, then kinetic energy is proportional
to mass. So if speed doesn't change while mass increases, then
kinetic energy increases, but I can't think of a situation where that
can happen.

it doubles, assuming the speed remains the same.

A cat lifting a barbell of 2.5 kg a distance of 3 meters. How much work is done lifting the barbell? How much work is done if the cat holds the barbell over his head for 3 minutes?

Answers

Work = (force) x (distance)

Force = weight of the barbell = (mass) x (gravity) = (2.5 kg) x (9.8 m/s²)

Work = (2.5 x 9.8 newtons) x (3 meters) = 74 newton-meters = 74 joules.

It takes 74 joules to lift the 2.5-kg load 3 meters up off the floor.

After that, as long as the load is held motionless, no more work is done.

A Walkman uses a standard 1.5 volt battery. How much resistance is in the circuit if it uses a current of 0.01 A

Answers

Using the ohm's law: v=IR

1.5=0.01R

R=150 ohm

Friction in machines is commonly reduced by using what?

Answers

The answer would be lubricant

Answer:

the correct answer would be lubricant.I hope that helps!!!

Explanation:

How can you make gravity smaller and bigger

Answers

The force of gravity = GMm / r^2, where G is gravitational constant, M is mass of one object, m is mass of another object, r is distance between them.

To make gravity smaller, decrease mass or increase distance.
To make gravity bigger, increase mass or decrease distance.

You can increase the forces of gravity between you and,
let's say, a planet, in two ways.

Way #1:
Increase your mass.
(Eat or drink more.
Fill your pockets with rocks.
Put on a heavy coat or space suit.)

Way #2:
Get closer to the center of the planet.
(That only works down to the planet's surface, but
it stops working if you go below the surface.)

To decrease the forces of gravity, do exactly the opposite:
-- lose weight
-- get farther away from the object that gravity is attracting you to .

Also, don't forget:
The forces of gravity always work both ways.
The less the planet pulls on you, the less you pull on the planet.
The harder the planet pulls on you, the harder you pull on the planet.

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