A rock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground. What was the potential energy of the rock before it began to fall?

Rita throws a ball straight up into the air and catches it at the same position from which she threw it. The ball has 18 J of mechanical energy when it leaves her hand.

In Seed plants, sperm form inside of ...

A person flings a nickel off of the Willis tower (h = 324 m) with a downward velocity of magnitude V0 = 6 m/s. a. Calculate the time t, in seconds, that it takes for the nickel to fall. B.

Give two examples of common force fields and name the sources of these fields.

What is the minimum speed with which he'd need to run off the edge of the cliff to make it safely to the far side of the river? the answer was 6 m/s the world-record time for the 100 m dash is approximately 10 s.

Identify the scenario below as to whether they increase, decrease, or not change the frequency in which a string vibrates and thus change its pitch. Assume that no other changes are happening. 1. Tightening a string for greater tension 2.

Explain what each of the following scientists contribute to the atomic theory

A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Do the following quantities increase, decrease, or stay the same? Select one or more: a. delta V increases b.

Energy is observed in two basic forms: potential and kinetic. Which of the following correctly matches these forms with a source of energy? a. the heat released from a living organism: potential energy b.

What should you do when operating a boat in large waves and high wind?