Which kind of mechanical wave needs a source of energy to produce it?

Can someone give me a detailed explanation on the physics of drums? How do drums get that sound from a physics perspective? (It is for a project on the physics of musical instrument and I have drums

Neglecting air resistance, when does a struck baseball accelerate downward at a rate of 9.8 m/s2?

A 32-ounce stack of paper is at a temperature of 65°F. Then the paper is divided into fourths. The amount of thermal energy in each part is about the amount of thermal energy in the original 32-ounce stack of paper. A. The Same As B. Four Times C.

Which statement best describes how the period and frequency of electromagnetic waves change between gamma rays and microwaves?

Which gas is found in air in the smallest amounts

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.