you hold a metal block of mass 40 kg above your head at a height of 2 m how much work is done bu gravity if you let the block fall to the ground

How did sir isaac newton illustrate the theory of gravity

Why do elements produce different numbers of spectral lines

The color of an object is in the object itself.

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. he then falls onto a thick pad. the top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest.

A car drives at a constant speed of 3m/s around a circle with radius 20m. What is the centripetal acceleration of the car

Which describes a property shared by ultraviolet light and X-rays? A They are both transverse waves. B They share the same wavelength. C They contain less energy than visible light. D They both require a medium to travel through.

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a