Multiple Choice
In raising a 5000-N piano with a pulley system,for every 1 m of rope pulled down,the piano rises 0.1 m.Ideally,this means the force needed to lift the piano is
A) 50 N.
B) 500 N.
C) 5000 N.
D) not enough information
Correct Answer:
Verified
Correct Answer:
Verified
Q53: The greater efficiency achieved with the curved
Q150: A moving object has<br>A)speed.<br>B)velocity.<br>C)momentum.<br>D)energy.<br>E)all of the above
Q151: Power is defined as the<br>A)force exerted divided
Q152: A car moves 4 times as fast
Q153: Compared to a recoiling rifle,the bullet that
Q154: Bronco's speed increases after he dives from
Q157: The most underlying feature of machines is<br>A)energy
Q158: When the input piston of a hydraulic
Q159: A blob of material in outer space
Q160: If you do work on an object