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

a. a transverse wave

b. a longitudinal wave

c. a surface wave

d. all of the above

what's the equation that links change in gradational potential energy store, mass, gravitational field strength, height

a scientist spends most her time observing the motion of an object and how they behave which branch of science is she studying?

A stone is dropped from top of a tower of 50m high, simltaneously another stone is thrown upward with a speed of 20m/s find the time when them cross each other

Two waves have the same wavelength and frequency. how do their speeds compare?

A proton enters a uniform magnetic field of strength 0.5 T at 200 m/s. The magnetic field is oriented at an angle of 30° to the proton's velocity.

Which describes why the magma moves in the direction of the arrows? A The magma is cooled and becomes more dense by the core moving it toward the crust. B The magma is heated and becomes more dense by the core moving it toward the crust.

Determine the difference in the speed of sound in hydrogen at 0 degrees Celsius and in air at 30 degrees Celsius. Also indicate if is it faster or slower

A small car and a large truck are driving down a highway, which statement would support the premise that the truck has more momentum? A) A large truck has a much larger mass. B) A car has a smaller engine than a truck.

Is there a dark side of the moon? (note: this question can be effectively answered either yes or no, so it is important to explain your reasoning?

Jennifer, who has a mass of 40.0 kg, is riding at 25.0 m/s in her red sports car when she must suddenly slam on the brakes to avoid hitting a deer crossing the road. She strikes the seat belt, that brings her body to a stop in 0.400 s.