What type of heat transfer could keep the paper in the air?

A pet lizard and its shelter must be kept warm. What type of electromagnetic waves would most likely be used?

What happen to the frequency of a sound wave as you change the pitch? what changes with more value?

An elevator weighs 1500 Newtons. Calculate how much potential energy it has when it is lived 500 meters in the air. 75,000 J 750 J 7,500,000 J 750,000 J

A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3.

An elevator and the people inside have a combined mass of 980 kg in a building where each floor is 3.6 m apart. If the elevator's power rating is 55 kW how long does it take for a trip from the 4th floor to the 8th?

During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the top of the science building. Determine distance the ball has traveled after falling for 1.

A teacher wants to demonstrate that unheated water can boil at room temperature in a beaker within a bell jar connected to a vac-uum pump. However, the vacuum pump is faulty and can reduce pressures only to 15 kPa.

How many btus of heat energy are needed to raise the temperature of 99.6 lbs of water from 50 °f to 130 °f?

What is a different form of a characteristic, such as brown hair, is called

A book falls of the table and hits the floor. Is work done? Why?