7. Nancy has a mass of 60 kg and sits on the very end of a 3.00 m long plank pivoted in the middle. How much torque must her co-worker provide on the other end of the plank in order to keep Nancy from falling on the ground?

a mass spring system makes 50 complete osillations in 10 seconds. what is the period and frequency of the oscillations

Einstein's theory of special relativity is based in part on which of the following postulates? mass and energy are equivalent. space and time are absolutes. energy is conserved only in elastic collisions.

Scientists use indicator species as an early warning system for environmental problems. There are certain criteria that an indicator species must meet. They include ALL BUT ONE of those listed here.

A bicycle coasting downhill reaches its maximum speed at the bottom of the hill. This speed would be even greater if some of the bike's energy had not been transformed into energy A) kinetic; heat OB) heat; potential C) kinetic;

Which of these is a part of lithosphere A. inner core B. outer core C. all of the mantle D. crust and outer part of the mantle really need the answer

A falling back in mid air has what

What objects are often arranged by their properties

Which nuclei is not radioactive? A. Am-241 B. Mg-24 C. Pu-241 D. U-238

What is the method of charging used when you run a straw with fur

A man runs at a velocity of 6.2 m/s for 11.5 minutes. When going up and increasingly steep hill, he slows down at a constant rate of 0.25 m/s^2 and comes to a stop. How far did he run?