Physics 1401

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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