work
what is the formula for work ?
w=f/d
Newton meter is equal to?
Joule
what is the smallest unit of power?
watt
An object possesses kinetic energy due to?
motion
The chemical bonds in sugar are..
potential energy
The mass of the object measured using
Kilograms
The rate of doing work is defined as
power
What happens to the kinetic energy of a moving object if the net work done is positive?
kinetic energy increases
The net work done by the force on an object is equal to change in its
Kinetic energy
what is the formula for potential energy?
PE=mgh
Which of the following is a scalar quantity?
velocity, force, work done, or momentum
work done
What does the work-kinetic energy theorem state?
Net work equals the change in kinetic energy
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 2 J. What is the spring constant if the elongation of the spring is 10 cm?
400 n/m
Kinetic energy is a?
Which of the following has gravitational potential energy?
book on shelf, girl sprinting, stretched spring
book on shelf
A rocket rises up in the air due to the force generated by the fuel. The work done by the..
A net work of negative 50 J is done on an object. What happens to the objects speed?
it goes down
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m?
13 cm
What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s?
KE = 16875 J
A 75-kg refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the potential energy of the refrigerator?
2.205 x 10^5 J
A spring with an initial stretch of 0.20 m has a force constant 10 N m-1. When the stretch is changed to 0.25 m, the increase in potential energy is..
A softball player used energy to hit the ball.
Work was done on the ball through transfer of energy. True or False?
true
A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force?
3000N
What is the Kinetic Energy of a 1200 kg object that is moving with a speed of 24 m/s?
KE = 345,600 J
A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at the height of the seat-top?
13.23 J