Why does gravitational energy increase away from earth

A man can walk three blocks east and four blocks north in 20 min. He can drive 12 times that distance in the same amount of time

skad [1K]

Answer: 25.2 km

Explanation:

3 blocks east and four blocks east = 7 blocks

1 block = 0.3 km --> 7 blocks = 2.1 km

12 times 2.1 km = 25.2 km

4 0

3 years ago

By 1949 Americans who lived within the range of a television stations in the country could watch TV, vastly changing the way tha

fredd [130]

Answer: Microwaves.

Explanation: First, we have a trivial answer, and that is the visible light, which is responsible to let the information on the tv to be seen by the user.

Now, TV technology was possible thanks to the microwaves, that are used because these can carry more energy than other types, and these microwaves needed a special technology because they couldn't be handled by the current technology at the time.

5 0

4 years ago

You apply the brakes of your car abruptly and your book starts sliding off the front seat. Three observers sitting in the car ex

krek1111 [17]

Answer:

All the observers are correct.

Explanation:

This is simply a problem of reference frames from which the motion of the book is being viewed by the various observers.

From their various reference frames, they are all correct.

Observer A must be in the inertial reference frame.

Observers who can explain the behavior of the book and the car by using the relationship between the sum of the forces and changing velocity are said to be observers in inertial reference frames.

This is clearly shown by what observer A noticed. There was a relative motion between the book and the car as she pointed out, making her to be in an inertial reference frame.

Similarly, observers in inertial reference frames can also explain the changes in velocity of objects by considering the forces exerted on them by other objects.

This is shown by observer B as he is able to notice how the force of the car affects the velocity of the book.

Observer C is actually in a non-inertial reference frame, as newtons law of force motion relationship are no longer observed. This occurs in the non inertial reference frame.

7 0

3 years ago

You break a piece of Styro foam packing material, and it releases lots of little spheres whose electric charge makes them stick

stich3 [128]

Answer:

The magnitude of charge on each sphere is $q=2.50\times 10^{-8}\ C$ .