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

Which types of energy are released by the friction force between a car's tires and the road during a skidding, squealing stop? * A: Heat and sound B: Motion and friction C: Nuclear and gravity D: Lubrication and motion

What is refraction? a. a light wave bounces back after hitting a barrier b. a light wave passes through a different medium, making an object appear bent c. a light wave passes through or is absorbed by a medium (opaque, translucent, transparent)

Fine grains of beach sand are assumed to be spheres of radius 38.9 µm. These grains are made of silicon dioxide which has a density of 2600 kg/m3 . What is the mass of each grain of sand? Answer in units of kg. ... ?

The difference in outcome between the potential energy in a marshmallow burned over a campfire on the end of a stick and in one that you eat straight from the package is

When x-rays of wavelength 0.312 nm are directed at a crystalline sample, the smallest bragg angle for a certain family of reflecting planes is found to be 28.5°.

It always takes to change the motion of an object. O A. electricity OB. energy C. gravity D. density Reset

What might a psychodynamic theorist think about a person with extreme shyness?

Determine the magnitude of the acceleration for the speeding up phase.

A battery is used to?

A person riding on the roof of a freight train throws a ball forward. (a) If we ignore air drag and relative to the ground, is the ball moving faster or slower when the train is moving than when it is standing still?