,
, tyrionpapers.com
(ii) The student releases the trolley and the trolley moves down the runway.
The student assumes that all the extra gravitational potential energy, ∆GPE,
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
stored at the top of the runway is transferred to kinetic energy at the end of
the runway.
Calculate the expected value of the velocity of the trolley at the end of
the runway.
Use the equation
2
GPE
v2
m
(3)
expected velocity = ...................................................... . . . . . . . . m / s
(iii) The light gate, shown in Figure 1, is used to determine the actual velocity of
the trolley at the end of the runway.
The actual velocity at the end of the runway is less than the expected velocity
as calculated in (ii).
Suggest one way to reduce the difference between the actual velocity and
the expected velocity.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
3
*P78715RRA0328* for more: tyrionpapers.com
Turn over
, tyrionpapers.com
(b) A different student finds out how much power can be generated by running up
some stairs in a measured amount of time.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
The following quantities are measured:
mass of student = 48 kg
total height of stairs = 2.9 m
time to run up stairs = 3.4 s
Calculate the power the student generated.
Give the answer to 2 significant figures (2 s.f.).
Use the equation
weight of student × height of stairs
power =
time to run up stairs
(3)
power = ............................................... . . . . . . . . . . . . . . . W
(Total for Question 1 = 9 marks)
4
*P78715RRA0428* for more: tyrionpapers.com
, tyrionpapers.com
(ii) The student releases the trolley and the trolley moves down the runway.
The student assumes that all the extra gravitational potential energy, ∆GPE,
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
stored at the top of the runway is transferred to kinetic energy at the end of
the runway.
Calculate the expected value of the velocity of the trolley at the end of
the runway.
Use the equation
2
GPE
v2
m
(3)
expected velocity = ...................................................... . . . . . . . . m / s
(iii) The light gate, shown in Figure 1, is used to determine the actual velocity of
the trolley at the end of the runway.
The actual velocity at the end of the runway is less than the expected velocity
as calculated in (ii).
Suggest one way to reduce the difference between the actual velocity and
the expected velocity.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
3
*P78715RRA0328* for more: tyrionpapers.com
Turn over
, tyrionpapers.com
(b) A different student finds out how much power can be generated by running up
some stairs in a measured amount of time.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
The following quantities are measured:
mass of student = 48 kg
total height of stairs = 2.9 m
time to run up stairs = 3.4 s
Calculate the power the student generated.
Give the answer to 2 significant figures (2 s.f.).
Use the equation
weight of student × height of stairs
power =
time to run up stairs
(3)
power = ............................................... . . . . . . . . . . . . . . . W
(Total for Question 1 = 9 marks)
4
*P78715RRA0428* for more: tyrionpapers.com
