A 42 kg pole vaulter running at 13 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar

How much kinetic energy (in terms of K) would the piece of wood gain if the spring were compressed 15.8 {\rm cm} instead?

A uniform meter stick with a mass of 190 is supported horizontally by two vertical strings, one at the 0- mark and the other at the 90- mark

It has been suggested that rotating cylinders about 12 mi long and 3.9 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth

A car of mass M= 900kg traveling at 45.0 km\h enters a banked turn covered with ice. The road is banked at an angle , and there is no friction between the road and the car's tires. What is the radius of the turn if theta = 20.0 degrees (assuming the car continues in uniform circular...

An object is placed 12.0 cm in front of a converging lens of focal length 5.00 cm. A concave mirror with radius of curvature 20.0 cm is located 30.0 cm in back of the lens as shown. (refer to attached picture) 1.) At what distance from the lens does the first image (from the lens) form? 2.)...

A constant torque of 21.4 N m is applied to a grindstone whose moment of inertia is 0.125 kg m2. Using energy principles, calculate the angular speed (in revolutions per second) after the grindstone has made 19.0 revolutions. (Neglect friction.) Do not enter units.

A worker pushed a 27 kg block 11.6 m along a level floor at constant speed with a force directed 34 below the horizontal. (a) If the coefficient of kinetic friction is 0.20, how much work was done by the worker's force?

a solid, uniform disk of radius 0.250m andn mas 55.0kg rolls down a ramp of length 4.50m that makes an angle of 25.0 degrees with the horizontal. the disk starts from rest from the top of the ramp. Find a. the speedd of the disk's center of mass when it reaches the bottom of the ramp and...

children in a tree house lift a small dog in a basket 4.50 m up to their house. if it takes 221 J of work to do this, what is the combined mass of the dog and the basket?