Will someone please help me with these Physics questions.

Question

The temperature of a substance changes from 20º C to 50º C. What is this change as expressed in Kelvin?

a. 313 K

b. 30 K

c. 20 K

d. 36 K

Now assume that all of the potential energy went into kinetic right as it is about to hit the bottom. What would be the value for the kinetic energy? 

a. less

b. not information

c. more

d. same

A piece of sandpaper gets hot when it is rubbed against rusty metal. Which of the follow best explains this phenomenon.

a. Work energy is transferred from the sandpaper into the metal.

b. Energy is transferred from the metal to the sandpaper

c. Friction between the metal and the sandpaper transfers energy to both

d. Work energy is transferred from the hand to the sandpaper.

Answer 1

Taylor H.,

These are very basic questions; if you are uncertain about them, you would be advised to get some regular tutoring. Just answering them for you won't help you understand the concepts. Much.

That being said, 1 C = 1 K as relative scales

Assuming object is falling with gravity, as opposed to being forced downwards against a spring, kinetic energy increases with distance dropped

Friction is it. The hand does do work, but accelerating the sandpaper (which would be choice d.) is not the primary result

-- Cheers, and do look for some tutoring, even by peers. -- Mr. d.