1. A force acting on an object does no work if

A a machine is used to move the object

B the force is not in the direction of the object's motion

c the force is greater than the force of friction

A baseball with a mass of 0.8 kg is given an acceleration of 20m/s. how much force was applied to the ball

The strength of an electromagnet can be altered by A. using AC current. B. increasing the number of coils around the core. C. increasing the diameter of the wire wrapped around the core. D. using DC current.

A dog pulls on a pillow with a force of 8.4 N at an angle of 31 degrees above the horizontal. what is the x component of this force?

A 0.14-kg baseball is dropped from rest from a height of 2.0 m above the ground. what is the magnitude of its momentum just before it hits the ground if we neglect air resistance?

Instantaneous speed is measured

A 231-ω and a 206-ω resistor are connected in series across an unspecified power supply. if the current through the 231-ω resistor is 0.39 a, what is the exact current (in a. through the 206-ω resistor? do not include units with your answer.

What is it called when you connect an object to earth with a conductor

Why is venus the hottest planet in the solar system

Which of the following is an example of an electromagnetic wave? A. ripples on a lake B. the honking of a car horn C. the light from a neon sign D. aftershocks from an earthquake

How fast can we travel in space with current technology?