The Doppler effect occurs when a source of sound moves

A. away from you.

B. toward you.

C. both A and B

D. none of the above

A trolley of mass 1000 kg moving at 10 m/s collides and hooks onto another identical trolley at rest. What is the velocity of both the trolleys together?

What is the process where dna can change in many ways?

Yosef applies an input force of 50 N to a crowbar. The crowbar applies a force of 750 N to the lid of a crate. What is the mechanical advantage of the crowbar? The mechanical advantage of the crowbar is .

A model rocket is launched at an angle of 70° above the x axis, with an initial velocity of 40m/s. How far horizontally will the rocket travel? A. 32.8m B. 56.1m C. 104.9m D. 182.1m

How are trade winds affected by the coriolis effect

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have

Explain Newton's First Law for the following. If you walk across the room holding a ball, when should you drop it to ensure that it lands on a target? Before, after or when you are directly on the target?