A pure substance can be a ... (a) element (b) compound (c) either element or compound (d) none of these

A maze of passagways called the

What is the wavelength of a 2.50-kilohertz sound wave traveling at 326 meters per second through air? (1) 0.130 m (3) 7.67 m (2) 1.30 m (4) 130. m

Two movers use a rope system to lift a box to a third-story apartment. They do 1,200 J of work on the rope system, and the rope system does 1,020 J of work on the box. What is the efficiency

Magma that explodes from a volcano and solidifies in the air is called

The windchill index tells you A. how wind and temperature affect your body in winter. B. the temperature of the water during winter. C. how wind speed affects heating needs for structures. D. the amount of moisture in the air.

Disadvantages of magnets

What type of motion occurs when an object spins around an axis without altering its linear position?

What happens to the movement of particles in a liquid when it is heated?

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.