Physics Answers

An object wtih mass m has moment of inertia I about its center of mass. If we take the moment of inertia at a distance 3d from the center of mass, how does I change?

Hard-working Manny is forced to pull a 1000 [N] box located at the bottom of the inclined plane using a string with a force of 2000 [N] until it reaches the top of the inclined plane. The frictionless inclined plane has a surface length of 3.0 [m] and makes a 30◦ angle with respect to the ground. What is the total work done on the box?

Stacy confirms that Marcus dropped the ball with a mass of 1.20 [kg]. The ball hits the floor at 2.40 [m/s] and bounces back at 2.00 [m/s]. The time of contact between the ball and the floor is 0.1 [s]. Assuming an elastic collision and the upward direction being the positive direction, what is the average force that the floor exerts on the ball during the impact?

A box of mass 20.0 [kg] slides down from the

top of a surface inclined at 50.0◦ with height of 10.0 [m],

as shown in the figure. The coefficient of kinetic friction

between the box and the inclined surface is µk = 0.350.

When the box reaches the bottom of the incline, what is

the work done by the weight of the box?

How far a sledge be pulled with 8.2 kJ energy if a pulling force of 110 N is needed?

Suppose Ain in the hydraulic lift is bigger than Aout. How does the change in a fluid level in Ain compare to the distance the car was lifted.

Convert 50.0 rev to radians

the 600N force applied to the bracket at A is to be replaced by two forces , Fa in the a-a direction and Fb in the b-b direction, which together produce the same effect on the bracket as that of 600- N force determine Fa and Fb

1. A negatively charged ebomite rod repels a suspended object.can we conclude that the object is negatively charged?

A disoriented physics professor drives 3.25 km north, then 2.20 km west, and then 1.50 km south. Find the magnitude and direction of the resultant displacement using the component method.