5. For what purpose do bats use ultrasonic waves?

O Doppler effect

O sonar

O echolocation

O ultrasound

If Chris drives 27 km N and then 40 km E, what is the distance and displacement

Which of the following nuclei would be most stable? A nucleus that contains 10 protons and 10 neutrons A nucleus that contains 7 protons and 7 neutrons A nucleus that contains 100 protons and 200 neutrons A nucleus that contains 84 protons and 84

Boltzmann's constant is 1.38066*10^-23 J/K, and the universal gas constant is 8.31451 J/K · mol. If 2.9 mol of a gas is confined to a 6.6 L vessel at a pressure of 7.1 atm, what is the average kinetic energy of a gas molecule? Answer in units of J.

In your own words, describe the purpose of using a chemical equation.

What is compression?

Which is a chemical change

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is?

What is the electrical power when the current is 25 amps and the voltage is 10 volts?

A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist's resultant displacement? magnitude: 13.0 mi; direction: 22.

What is the low end of the range of surface temperature of white stars