SC 101 Test 2

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1. 
When a chocolate bar is cut in half, its density is
 
unchanged
 
2. 
If the volume of an object were to double while its mass stays the same, its density would
 
half
 
3. 
Water pressure is greatest
 
against the bottom of a submerged object
 
4. 
Pumic is a volcanic rock that floats. Its density is
 
equal to the density of water
 
5. 
The reason that buoyant force acts upward on a submerged object is that
 
upward pressure against the bottom is greater than downward pressure against the top of the submerged object
 
6. 
What is the buoyant force acting on a 10 ton ship floating in the ocean?
 
10 tons
 
7. 
When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure
 
doubles
 
8. 
Atmospheric pressure is caused by
 
weight of the atmosphere
 
9. 
A rising balloon is buoyed up with a force equal to the
 
weight of air it displaces
 
10. 
Temperature is related mostly to the
 
average molecular kinetic energy in a substance
 
11. 
The lowest temperature possible in nature is
 
-273*C
 
12. 
Heat energy is measured in units of
 
both Joules and calories
 
13. 
As a system becomes more disordered, entropy
 
increases
 
14. 
A substance that heats up relatively quickly has a
 
low specific heat capacity
 
15. 
The column of mercury in a mercury thermometer would rise when the temperature
 
increases
 
16. 
A substance can absorb heat energy by the process of
 
conduction, convection, and radiation
 
17. 
You're served coffee at a restaurant before you're ready to drink. In order for it to be the hottest when you're ready, add cream
 
right away
 
18. 
If you want to cook eggs by boiling them while in the mountains, then compared to sea level cooking, you should
 
boil the eggs for a longer time
 
19. 
The unit of electric charge, the coulomb, is the charge of
 
a specific large number of electrons
 
20. 
When the distance between two charges is halved, the electrical force between the charges
 
quadruples
 
21. 
The electrical force on a 2C charge is 60N. What is the value of the electric field at the place where the charge is located?
 
30 N/C
 
22. 
If you use 10J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is
 
10V
 
23. 
An ampere is a unit of electrical
 
current
 
24. 
the current through a 10 ohm resistor connected to a 120V power supply is
 
10.0A
 
25. 
A 10 ohm resistor has 5A current in it. What is the voltage across the resistor?
 
50V