The doppler effect is the change in observed frequency due to

a. the type of medium the wave is in

b. the type of wave

c. the original frequency of the source

d. the motion of the source or observer

At a drag race, the light turns green and 0.00125 hours later, a dragster is travelling 300 miles per hour. Calculate the acceleration of the dragster

On March 21, a stick casts the following shadow. What is the most likely time of day? March 21 Shadow of stick Overhead Projection 9:00 AM 12:00 Noon 3:00 PM 7:00 PM

Explain what all John Dalton did in atomic theory

A positive charge is moving across a room from south to north. A magnetic field runs from east to west. In what direction is the magnetic force on the moving positive charge? toward the east toward the west toward the west toward the ceiling

If the man on the left pulls on the object with a force of 500 N and the man on the right pulls on the object with a force of 750 N, what is the net force exerted on the object? A. 1250 N to the right B. 1250 N to the left C. 250 N to the right D.

How long will it take a car that is moving at 60 miles per hour to travel 120 miles?

Calculate the force required to give 380kg car an acceleration 10m/s square

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2 s later. If the speed of sound is 340 m/s, how high is the cliff?

If a decision was made to increase agriculture fertilizer application, which would be an example of a negative trade-off based on this decision? A) excessive nutrients B) farm profits increase C) increase crop production D) consumer prices decrease

How are all mobile phones different from fixed telephones in the way that they transmit and receive voice messages?