Atemperature of a 50 kg block increases by 15°c when 337,500 j of thermal energy are added to
the block. (chapter 5 - pages 141-142)
a. what is the specific heat of the object? show the appropriate equation from your book
and show your work with units.
c. what is the block made of? use the chart on page 141.
d. is this block a good material for insulators or conductors?

The speed of light can be used to measure the

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up