What is the speed of sound in air when the temperature is 20°C?

319 m/s

331 m/s

343 m/s

219 m/s

An input force of 50. newtons is applied through a distance of 10. meters to a machine with a mechanical advantage of 3.

in order for production to take place, the question of what is to be produced must be answered. which of the following is another question that must be answered in order for production to take place?

You walk 10 miles north, 20 miles south, and 5 miles north. Taking north to be the positive y direction, define a position vector that describes your position on the y-axis.

Clear glass, water, and air are examples of what kind of material

Maxwell shoots a rubber band at his friend Jimmy. Which type of energy is converted into kinetic energy? A) elastic potential energy B) nuclear potential energy C) chemical potential energy D) gravitational potential energy

What happens to a muscle when you exercise it?

A certain rain cloud at an altitude of 1.80 km contains 3.20 107 kg of water vapor. How long would it take for a 2.90-kW pump to raise the amount of water from Earth's surface to the cloud's position?

The law of conservation of energy states that A) energy may be created, destroyed or transformed. B) energy may be created, but only in certain types of nuclear reactions. C) energy may neither be created nor destroyed; it may only be transformed.

Pushing a rock from a hill top is called

What is a pulsar? a. the remains of a low-mass star after it explodes b. a spinning neutron star emitted radio waves c. another name for a protostar d. the stage before a dying star becomes a supernova