Since you may take the online quizzes as often as you like, your highest average should be pretty good. However, in order to keep track, you must fill out the student name and id# part of the form.

Question 1. The amount of work (in J) done in lifting a 50-kg sack a distance of 2 m is

(a) 0     (b) 100     (c) 500     (d) 1000     (e) 2000

 

 

Question 2. The increase in gravitational potential energy (in J) for the sack in question 1 will be

(a) 0     (b) 100     (c) 500     (d) 1000     (e) 2000

 

 

Question 3. A car moving at 25 km/h skids 10 m with locked brakes. At 75 km/h, the same car will skid a distance (in m) of

(a) 0     (b) 10     (c) 30     (d) 60     (e) 90

 

 

Question 4. A 5-kg crate is dragged across a level floor for a distance of 10 m by a force of 20 N. The amount of work done by the gravity force (in J) is

(a) 0     (b) 10     (c) 50     (d) 200     (e) 500

 

 

Question 5. A 60-kg skydiver moving at terminal velocity falls 50 m in 1 s. The power (in kiloWatts) that the skydiver expends on friction with the air is

(a) 0     (b) 10     (c) 30     (d) 50     (e) 100

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