A boy exerts a force of 225 n on a lever to raise a 1250 n rock a distance of 0.13 m. if the lever is frictionless, how far did the boy have to move his end of the lever?

Which of the following provides the best analogy for an electron in an atomic orbital? A. a cow grazing in a pasture B. a bird resting on a tree branch C. an ant crawling on the surface of a leaf D. a bee hovering around a bee hive

Which system sends nutrients to all the body's cells? excretory system nervous system circulatory system endocrine system

What experimental term is it called when a ruler is dropped to the floor?

A train travels 140 km in 2 hours and 30 minutes. What is its average speed?

0.01 kg of 4.0°C water is heated until its temperature is 37°C. If the specific heat of water is 4186J/kg°C, calculate the amount of heat energy needed to cause this rise in temperature. (Round to 2 Decimal Places)

How do you find Rtotal in a series without knowing the voltage?

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

All the colors of visible light can combine to form white light. a. True b. False

If the results of a study do not support a hypothesis, it means that the experiment failed.

How does a rubber band obey the law of conservation of energy?