A combustion reaction usually gives off heat and light is it true or false

The acceleration towards the center of the earth due to gravity is:

A transverse wave with a frequency of 125 Hz is traveling in the x-direction. How long will it take this wave to travel 3000 m in the x-direction? 0.42 seconds 2.0 seconds 2.4 seconds 4.8 seconds

The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m^2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles.

Jim began a 153-mile bicycle trip to build up stamina for a triathlon competition. Unfortunately, his bicycle chain broke, so he finished the trip walking. The whole trip took 5 hours.

An electron with a charge of - 1.6 * 10-19 coulombs experiences a field of 1.4 * 105 newtons/coulomb. What is the magnitude of the electric force on this electron due to this field? 1.6 * 10-3 newtons 1.4 * 1024 newtons 2.2 * 10-14 newtons 7.

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?

The process of changing the energy of a system by means of force. Force * Diatance

A gnat takes off from one end of a pencil and flies around erratically for 18.6 seconds before landing on the other end of the same pencil. If the gnat flew a total distance of 7.15 meters, and the pencil is 6.

An apple falls from an apple tree growing on a 20° slope. the apple hits the ground with an impact velocity of 16.5 m/s straight downward. what is the component of the apple's impact velocity parallel to the surface of the slope?

Objects falling through the air experience a type of friction called air resistance. true or false