Sound moves at a speed of 340 m/sec. If an airplane is overhead at 8500m how long will it take for the sound to reach you

A ball of mass 2.0 kg falls vertically and hits the ground with speed 7.0 ms-1 as shown below. The ball leaves the ground with a vertical speed 3.0 m/s. The magnitude of the change in momentum of the ball is A. zero. B. 8.0 Ns. C. 10 Ns. D. 20 Ns.

Consider the magnetic field (B) of a wire with a constant current (I). A Magnetic Field sensor is placed at a radius (r).

Which of the following involves the diffraction of light waves

Which of the following is a conversion from chemical energy to thermal energy? Coal is burned to boil water. Food is digested and used to regulate body temperature. Charcoal is burned in a barbeque pit. All of the above.

How close is the nearest star in miles?

What are the benefits of the cool-down period following exercise?

What force keeps our atmosphere from floating out into space? heat water gravity outgassing

a subsrance has an atomic number of 80. How many protons and electrons do atoms of the substance have? what is the subsance?

Ideal meters problem. What internal resistance is ideal for a voltmeter? What internal resistance is ideal for an ammeter?

numerical question : what is the required heat to raise the temperature of 2 kg parrafin by 10 Celsius if 44000 joules is required to raise it by 200 celsius