|
1. A girl wanted to play with her little brother. Which picture
showe the best way for the girl, who weighs 50 lbs. to balance her
brother, who weighs 25 lbs.?*
Click
Here for Answer
2. Using
a frictionless pulley system, Victoria lifts a 20-lb object applying
a 10-lb force. Dan, using a different frictionless pulley system,
uses a 20-lb force to lift a 20-lb object. Both lift their 20-lb
object up by 5 feet very slowly. Which of the following statements
is true?
a. Dan does twice as much work as Victoria does to lift the object
up by 5 feet
b. Victoria does twice as much work as Dan does to lift the object
up by 5 feet
c. Victoria does the same amount of work as Dan to lift the object
up by 5 feet
d. None of the above statements are true
Click
Here for Answer
|
|