Question

A skateboarder is standing at the top of a tall ramp waiting to begin a trip. The skateboarder has
A)
kinetic energy only.
Eliminate
B)
potential energy only.
C)
both kinetic and potential energy.
D)
neither kinetic or potential energy.

Answer 1

B

Answer 2

Potential Energy only. An object at an elevated position will have stored energy while not in motion (potential energy) defined by (m*h*g) or (weight*h) due to gravity. Once the object starts moving the object transitions to Kinetic Energy which is defined by (.5*m*v^2).

Answer 3

As matter changes state from gas to liquid, which of these statements is true?
A)
The particles speed up.
Eliminate
B)
The particles slow down.
C)
The particles get farther apart.
D)
The attractive force between the particles decreases.

Answer 4

@Rhystic @amiy ^

Answer 5

B. the particles will slow down. In a gas the particles are moving rapidly and have greater distance from each other than from a liquid. Similarly in a liquid, the particles move around but not as quickly and are much closer together than in a gas. Finally, in a solid, the particles are already packed closely together and don't really move too much.

Answer 6

C. Motors in general generate heat energy as a byproduct (there are a couple exceptions) which why they're prone to overheating. In theory a coat of paint over the metal conducts heat away from the metal faster than air can get the heat away from the metal alone. This has been substantiated through a few tests but realistically the difference is minimal in your everyday car.

Answer 7

in liquids intermolecular forces between molecules are stronger than that of gases .so particels go to slow down