Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are:

a. 11 kHz

b. 10 kHz

c. 0 kHz

d. 9 kHz

Which is the most accurate description of compounds? O A) They are not pure substances. OB) They are made of only 1 type of atom. OC) They are the basic building blocks of matter.

Which is an example of projectile motion? a person throwing a rock a child swinging on a swing set an athlete running on a track a teacher picking up a pencil

Niko was hiking in the mountains when he found a spring, or a place where water naturally flows out of the ground. Where did the water in the spring come from? A. It is water that was squeezed out of an igneous rock when the rock changed. B.

Was Copernicus heliocentric or geocentric

We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J into another system. What is the efficiency of the heat engine? (show you work)

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.

A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the ground 10.3 m from the net, and after Serena hit the ball it flew over the 0.

A force of 1.25x103N is required to lift an object that is under the influence of an acceleration due to gravity of 7.86ft/sec2. What is the object's mass in kilograms?