NEW
Font size
S
M
L
XL
WorksheetsWHS17Energy Marta
Total questions: 7
Worksheet time: 4mins
Name
Class
Date
1.
A girl scout is pulling a wagon with cookies with a force of magnitude F=107N. The force makes an angle of 32o with the horizontal. The girl pulls for 10m. Calculate the work done by the wagon.
a)
-645.9 J
b)
892.6 J
c)
584.1 J
d)
708 J
2.
A boat of mass 146kg being towed has a net force of 520N applied to it. The boat starts at rest and travels down a horizontal street. Find the speed of the boat after it has travelled 210m.
a)
26.0 m/s
b)
-34.5 m/s
c)
19.4 m/s
d)
38.7 m/s
3.
A 37.0kg girl is at the top of a hill. At the initial point she is 37m vertically above the end of the hill. Find the difference in potential energy between the points.
Hint: the end of the hill= 0 level of gravitational energy.
Hint: the end of the hill= 0 level of gravitational energy.
a)
13,416 J
b)
34,759 J
c)
11,784 J
d)
28,573 J
4.
A track runner jumps at an angle of 45o above the horizontal and rises vertically about 1.5m. With what speed does it leave the ground?
a)
6.3 m/s
b)
-5.6 m/s
c)
7.7 m/s
d)
0 m/s
5.
A boy slides on a weird shaped slide. The kid is 37kg and the height of the slide is 3.8m. What is the speed of the child at the bottom, if there is no speed at the top?
a)
-6.3 m/s
b)
16.8 m/s
c)
21.4 m/s
d)
12.7 m/s
6.
My sister and I, 97kg in total, get in a 2050kg elevator. There is a constant frictional force of 2750N retarding it upward. What minimum power must the motor deliver to lift the elevator at a constant speed of 2.7m/s?
a)
876450 W
b)
26.7 kW
c)
35000 W
d)
64.2 kW
7.
A 30kg box full of peanuts rests on the horizontal floor. It is pressed against a light spring with K=47N/m, compressed 1.85cm. Find the its speed after being released.
a)
0.023 m/s
b)
1.23 m/s
c)
-0.5 m/s
d)
0.23 m/s
Reset
