Which of the following displays a noncontact force? a. Opening a door b. Hitting a golf ball onto a fairway c. Typing on a keyboard d. Two magnets pulling toward one another

Anna needs to move a box of paperback books across the room. If she applies a force of newtons to the box, what is the magnitude of the force exerted by the box on Anna?

What is effort force?

A string vibrates at a frequency of 20 Hz. what is its period?

An airplane begins its take-off run at A with zero velocity and a constant acceleration a. Knowing that it becomes airborne 30 s later at B with a take-off velocity of 270 km/h, determine (a) the acceleration a, (b) distance AB.

How much time would it take for the sound of thunder to travel 2000 meters if the sound travels at the speed of 330 meters per sec

A constant force is exerted for a short distance on a block of mass that is initially at rest on a horizontal frictionless plane. This force gives the block a certain final speed v.

A football quarterback is moving straight backward at a speed of 3.00 m/s when he throws a pass to a player 20.0 m straight downfield. (a) if the ball is thrown at an angle of 25.

Simone is walking her dog on a leash. The dog is pulling with force of 34 N to the right and simone is pulling backward with a force of 16 N

An object moves with velocity v (t) = t^2-8t+7 a) write a polynomial expression for the position of the particle at any time t greater or equal to zero.

Is a lack of thorns a mutation? (on a plant)