Question

What is the gravitational potential energy of a book with a mass of 0.30 kg on a 1.0 m high desk?

Answer 1

use this equation,

E=mgh

Answer 2

Is it 0.3 joules?

Answer 3

you should multiply it by the g.

Answer 4

PE(grav) = mass x gravitational acceleration x h

PE = 0.30KG x 9.8m.s-1 x 1.0

PE = 2.94J
or 2.9J to 2 significant digits

Answer 5

so its 3 joules

Answer 6

If the index of refraction of glass is 1.5, calculate the velocity of light in glass.

_________ m/s


light always travels as 3.00 x 108 m/s
4.5 x 108
5.0x 10-9
2.0 x 108

Answer 7

approximately, yes

Answer 8

use formula -
refractive index = velocity of light in vacuum/velocity of light in medium

Answer 9

n = c/v

c= 3.00 x 10^8
n= 1.5

therefore v= c/n

Answer 10

2.0 x 10^8 m.s^-1

Answer 11

oh ok