Physics 121 Chapter 8 Conceptual
Questions and answers already passed
2025
Two boys are at the top of a waterslide at Seven Peaks Water Park. One boy
(boy A) slips off the top of the tower and falls unobstructed into the pool
below. At the same moment the other boy (boy B) starts sliding down the slide
and lands in the same pool. Ignoring air resistance and friction, which boy will
splash into the water first and which will have the greater speed when he hits
the water? - correct answer ✔A hits first and has the same speed as B.
A box is pushed across the floor against a constant frictional force. The box is
pushed across the room to the east in 30 seconds and returned to its starting
point (pushed to the west) in 60 seconds. Which of the following is true about
the work done and the power expended in both directions? - correct answer
✔Work going east = work going west; power going east > power going west
Three cannons are located at the top of a cliff above a level plain. Cannon A is
aimed at
an angle of 25° above the horizontal and shoots cannonballs with a speed of
85 m/s.
Cannon B is aimed directly horizontally and shoots with a speed of 100 m/s.
Cannon C
is aimed 25° below the horizontal and shoots with a speed of 75 m/s. Which of
the
cannonballs will hit the ground with the greatest speed? The three
cannonballs are not
necessarily the same mass. - correct answer ✔Cannon B: They all will
acquire the same change in speed ( related to the loss of
height from the top of the cliff to the plain), so the one with the largest speed
when it leaves the
Questions and answers already passed
2025
Two boys are at the top of a waterslide at Seven Peaks Water Park. One boy
(boy A) slips off the top of the tower and falls unobstructed into the pool
below. At the same moment the other boy (boy B) starts sliding down the slide
and lands in the same pool. Ignoring air resistance and friction, which boy will
splash into the water first and which will have the greater speed when he hits
the water? - correct answer ✔A hits first and has the same speed as B.
A box is pushed across the floor against a constant frictional force. The box is
pushed across the room to the east in 30 seconds and returned to its starting
point (pushed to the west) in 60 seconds. Which of the following is true about
the work done and the power expended in both directions? - correct answer
✔Work going east = work going west; power going east > power going west
Three cannons are located at the top of a cliff above a level plain. Cannon A is
aimed at
an angle of 25° above the horizontal and shoots cannonballs with a speed of
85 m/s.
Cannon B is aimed directly horizontally and shoots with a speed of 100 m/s.
Cannon C
is aimed 25° below the horizontal and shoots with a speed of 75 m/s. Which of
the
cannonballs will hit the ground with the greatest speed? The three
cannonballs are not
necessarily the same mass. - correct answer ✔Cannon B: They all will
acquire the same change in speed ( related to the loss of
height from the top of the cliff to the plain), so the one with the largest speed
when it leaves the
