A 5 g pecan hangs at the top of a very old pecan tree. The pecan has a gravitational potential energy of 1.1 J. How tall is the tree?

Why do scientists often take several measurements of the same object, average them together, and use the average value as the measurement?

A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff. How high was the cliff (rounded to the nearest tenth of a meter) ?

Determine the kinetic energy of 1000-kg roller coaster car that is moving with speed of 20.0m/s

Which of the following statements are true? 1. Liquid water expands with increasing temperature above 4°C. 2. Liquid water expands with increasing temperature between 0°C and 4°C. 3. Water contracts as it freezes at 0°C. 4.

Rays of light strike a bumpy road and are reflected. What can be predicted about the reflected rays?

A 1.00x10^3 crate is being pushed across a level floor at a constant speed by a force

How could you make a sound wave have a lower pitch

Ice caps at the north and south poles are very reflective the ice reflects light and heat rather than absorbing it.

When you jump straight up as high as you can, what is the order of magnitude of the maximum recoil speed that you give to the Earth? Model the Earth as a perfectly solid object.

Consider the Sun and Earth as a single system. How does the law of conservation of energy apply to this system? A) The energy from the Sun that reaches Earth is destroyed by Earth.