What role does friction play in the efficiency of machines

If you wanted to calculate the density of a baseball and you knew its mass and volume you would need the density formula and a (n) - A. calculator B. triple-beam balance, the formula for the volume of a sphere and a calculator. C.

A player kicks a football from ground level with a velocity of 26.2m/s at an angle of 34.2° above the horizontal. What is the footballs hang time, maximum height and range?

A ball is thrown straight up with an initial velocity of 50 m/s. a) How high will it go? b) How long does it take to reach this height?

It took 1700 J of work to stretch a spring from its natural length of 2 m to a length of 6 m. Find the spring constant k.

1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be a. an insulator b. on c. disconnected d. off 2.

Anybody know where I can find a list of all the physics 1 equations and or variables?

Two identical objects are pressed against two different springs so that each spring stores 55.0J of potential energy. The objects are then released from rest.

Zonal winds on the giant planets are stronger than those on the terrestrial planets because

When you try to stretch a bungee cord a distance x, it resists with an opposing force of the form b x2, where b is a constant. If b is measured to be 6 N/m2, how much work does it take to stretch the bungee cord a distance of 1 meterA. 2JB. 3JC. 0.

A 420 W vacuum cleaner is designed to operate 120 V. What is its resistance?