1. If you push an object twice the distance with twice the force, you do: a. twi
ID: 1376165 • Letter: 1
Question
1. If you push an object twice the distance with twice the force, you do:
a. twice the work
b. four times as much work
c. the same amount of work
2. A hunter aims a rifle at an angle 10 degrees above the horizon. The hunter fires a bullet while simultaneously dropping another bullet from the level of the rifle. Which bullet hits the ground first?
a. the dropped one
b. the fired one
c. they both hit the ground at the same time
3. Calculate the power in watts exerted by a weightlifter when she lifts a 50 Kg barbell a vertical distance of 1.0 meter in 1.5 seconds
Explanation / Answer
1.
as work done = force * distance
Now, 2 times force and 2 time the distance
Work done = 2*2 times
work done = 4 times
b. four times as much work
2.
for the fired bullet , as it has a component of velocity in vertical upwards direction ,
hence it takes more time to fall to ground.
hence , the bullet reaching ground faster is
c. the dropped one
3.
here ,as power = workdone/time
Power = 50 * 9.8 * 1.0/1.5
Power = 326.7 W
the power of the weightlifter is 326.7 W
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