If you use a stick to push an object, the muscular force acting on it is a non contact force. True or false? Explain

A turntable rotates counterclockwise at 76 rpm. A speck of dust on the turntable is at 0.45 rad at t=0. What is the angle of the speck at t = 8.0 s? Your answer should be between 0 and 2Ï rad.

A beam of protons is accelerated through a potential difference of 0.725kV and then enters a uniform magnetic field traveling perpendicular to the field. A) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.

Lucas puts new batteries in his radio-controlled car and its controller. He activates the controller, which sends a radio signal to the car. The car moves forward. Name at least three energy transformations that occurred.

In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints speed of 6.0m/sin 1.5. Assuming that the player accelerates uniformly, determine the distance he runs.

Although sunlight contains all colors of light, the brightest color is

Steam moves into a cylinder of a steam engine at a constant pressure and does 2.34 J of work on a piston. The diameter of the piston is 3.4 cm and the piston travels 4.6cm. What is the pressure of the steam?

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is