Transcript SC100 Unit 4b Homework Assignment

SC100 Class 5 Homework Assignment
• 1. Which of the following is a rate?
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a. joule
b. foot-pound
c. power
d. energy
e. newton
SC100 Unit 4a Homework Assignment
• 2. The watt number on a light bulb tells the
amount of energy the light bulb is using in joules
per second. Which of the following light bulbs is
using the most energy?
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a. 100-watt bulb that burns for twenty minutes
b. 75-watt bulb that burns for thirty minutes
c. 60-watt bulb that burns for one hour
d. 40-watt bulb that burns for two hours
e. 25-watt bulb left on for three hours
SC100 Unit 4a Homework Assignment
• 3. A stalled car is pushed to the top of a hill, allowed to roll
down the hill and started by “clutch-popping.” At which
point did the car have the greatest amount of potential
gravitational energy?
– a. at the bottom of the hill
– b. at the top of the hill
– c. when restarted with the clutch
– d. being pushed to the top of the hill
– e. as it was rolling down the hill
SC100 Unit 4a Homework Assignment
• 4. James Watt designed experiments in
horsepower to
– a. assist miners in removing ore.
– b. calculate the velocity of a water pump.
– c. quantify the energy generated by a horse in
mines.
– d. invent the steam engine.
– e. all of the above
SC100 Unit 4a Homework Assignment
• 5. When a meteorite hits the Earth, heat is
generated. Which of the following statements best
describes this process?
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a. Gravitational potential energy is converted into heat.
b. Electrical potential energy is converted into heat.
c. Chemical energy is converted into heat.
d. Magnetic energy is converted into heat.
e. Elastic potential energy is converted into heat.
SC100 Unit 4a Homework Assignment
• 6. Work is the product of force exerted and
distance travelled. True or False?
• 7. All work stops when a system runs out of
energy. True or False?