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10 questions
A force of 50-N is applied to a 4 kilogram mass. The acceleration of the object is:
200 m/s^{2}
12.5 m/s^{2}
54 m/s^{2}
46 m/s^{2}
By what factor will the kinetic energy of an object increase if the velocity of the object is tripled?
The kinetic energy will stay the same.
3
6
9
An object is thrown vertically upward with an initial speed of 15 m/s. What is the total time in the air?
3 second
1.5 seconds
5 seconds
3.5 seconds
An 8-kg object is raised by a crane to the top of a building 20-meters in height. If it takes 50 seconds for the object to get to the top of the building, then how much power was needed?
1600 watts
3.2 watts
32 watts
200 watts
A kg-m^{2}/s^{2} is otherwise known as a(n)
Newton
Joule
Watt
Displacement
If the gravitational force between two masses is F, then by what factor would the distance between the two object need to change if the mass of one of the objects is doubled in order for the force to remain the same?
4
2
2^{1/2}
6^{1/2}
A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:
Negative
Zero
Positive
Undefined
The area under a force-time curve represents:
Change in potential energy
Change in momentum
Change in force
Change in torque
A circular object of radius R has an angular velocity of k rad/s. The angular velocity at a point R/2 is:
2k rad/s
k/2 rad/s
k^{2} rad/s
k rad/s
Two forces are acting on an object; a horizontal force of 8.3 Newtons and a vertical force of 5.4 Newtons. The magnitude of the resultant force is about:
13.7 Newtons
2.9 Newtons
9.9 Newtons
6.3 Newtons
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