WorksheetsWork and Power
Total questions: 20
Worksheet time: 13mins
Work causes a transfer of _
(a)
The sign of the work done in this case would be.
0
+
-
Cannot answer without the values of the force and displacement.
The sign of the work done in this case would be.
0
+
-
Cannot answer without the values of the force and displacement.
The sign of the work done in this case would be.
0
+
-
Cannot answer without the values of the force and displacement.
W is equal to
F*d2
F*d*cos 𝝷
F2*d
(1/2)F*d
A 100 N force is applied to move a 15 kg object a horizontal distance of 5 meters at constant speed.
How many joules of work done?
(a)
A 100 N force is applied at an angle of 30o to the horizontal to move a 15 kg object at a constant speed for a horizontal distance of 5 m. (3 sig figs)
How many joules of work done?
(a)
An upward force is applied to lift a 15 kg object to a height of 5 meters at constant speed.
How many joules of work done?
(a)
A 10-N force is applied to push a block across a frictionless surface for a displacement of 5.0 m to the right.
What is the net work done?
(a)
Determine the work done in the following situation.
Ben Pumpiniron applies an upward force to lift a 129-kg barbell to a height of 1.98 m at a
constant speed.
(a)
Determine the work done in the following situation.
An elevator lifts 12 occupants up 21 floors (76.8 meters) at a constant speed. The average mass
of the occupants is 62.8 kg.
(a)
Power is defined as the _______ is done.
amount of work which
direction at which work
angle at which work
the rate at which work
Which of the following are units of power (though perhaps not standard)?
Include all that apply.
Watt
Joule
Joule / second
hp
What is the power of a 75 kg student who climbs up a 4 m ladder in 5 seconds?
(a)
How much energy does a 800 W microwave use if it runs for 2.5 minutes?
(a)
You leave a 5 W lightbulb on for a whole week.
If the energy company charges $0.10 per kWh, how much does it cost (in dollars) to leave the light on?
(a)
A Twinkie has 1,086,800 joules of energy in it.
How many times would a 50 kg student have to climb up 5 meter high stairs to work off the Twinkie?
(a)
What is the unit of energy in the SI (metric) system?
watt
joule
calorie
kilowatt-hour
What is the unit of energy used for food?
watt
joule
Calorie
kilowatt-hour
What is the unit of energy used by the power company?
watt
joule
calorie
kilowatt-hour
