The insulation in an old house is able to hold in 12,000 J of the 36,000 J that were used to heat it up. How energy efficient is this insulation?

Sound waves travel quickest through what do sound waves travel quickest through

In a hydraulic system, piston 1 has a surface area of 100 cm2, and piston 2 has a surface area of 900 cm2. A force of 150 N is exerted on piston 1 of the hydraulic lift. What force will be exerted on piston 2?

The role of a circuit breaker is

Surrounding every moving electron is a. an electric field b. a magnetic field c. both a and b d. none of the above

What is a group of individuals of the same species living in the same geographic area

Whitch tool could be used to mesure the mass of. a package being mailed

Most of an atom is empty space. a. True b. False

Two ice skaters, Skater X and Skater Y, are at rest on a horizontal surface made of ice. The friction between the ice and the skaters is negligible.

Hiker goes distance of 4km east start time 9:00am end time 9:45am. what was hike rs velocity

A hot saucepan is placed on a cold bench. Heat will flow from the saucepan to the bench until ... A. the bench is as hot as the saucepan was. B. the saucepan and bench are at the same temperature. C. the saucepan has lost all of its heat. D.