What is the change in internal energy if 50 J of heat are released from a system, and the system does 80 J of work on its surroundings?

Which of the following is an activity of daily living

Nearly all liquids and solids are nearly opaque to radiation at nearly all wavelengths. why is that

A circus acrobat is shot out of a cannon with an initial upward speed of 34 ft/s. if the acrobat leaves the cannon 4 ft above the ground, how long will it take him to reach a net that is 8 ft above the ground

The electric potential energy stored in the capacitor of a defibrillator is 73 j, and the capacitance is 120 f. what is the potential difference that exists across the capacitor plates?

A room contains air in which the speed of sound is 343 m/s. The walls of the room are made of concrete in which the speed of sound is 1 850 m/s. (a) Find the critical angle for total internal reflection of sound at the concrete-air boundary.

Which vocabulary term is survival of the fittest

An object weighs 32 newtons. What is its mass if a gravitometer indicates that g = 8.25 m/s2?

At what stage of a reaction do atoms have the highest energy? a. reactant stage b. product stage c. transition state stage d. The stage of highest energy depends on the atom.

A moon with a mass of 6.0 x 10 kg orbits about a planet with a mass of 5.0x 10^24 kg. They are 4.0 x 10^8 meters apart What is the gravitational force between them? The answer is 1.

What is the expression of the chemical composition of a compound?