Blog

An airplane of mass 2867 kg flies at a constant horizontal velocity to the right . The force of air resistance on it is 2225 N. What is the force acting on the plane (magnitude and direction)?

Determine if the following statements are true or false about gravitational force:  The gravitational force only acts between very, very massive objects.

Two identical charges, of 4.2 x 10-5 C, are 2.0 m apart. hwat is the electrostatic force between  them? K = 8.9 x109 N m2/C2

If you exert a force F on an object, the force which the object exerts on you will

  A A 0.140-kg baseball traveling 35.0 m/s strikes the catcher’s mitt, which, in bringing the ball to rest, recoils backward 11.0 cm. What was the average force applied by the ball on the glove?  

A wheel accelerates with a constant angular acceleration of 4.5 rad/s2.  If the initial angular velocity is 1.0 rad/s, what is the angle the wheel rotates through in 2.0 s?

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The speed of this object will be:

What is the gravitational force on a 70-kg person standing on the Earth, due to the Moon?  The mass of the Moon is 7.36 × 1022 kg and the distance to the Moon is 3.82 × 108 m. G = 6.67 x 10-11 N m2/ Kg2   

A wheel accelerates with a constant angular acceleration of 4.5 rad/s2.  If the initial angular velocity is 1.0 rad/s, what is the angular velocity at t = 2.0 s?

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?