A cop car's siren has a frequency of 700. Hz. If you are standing on the sidewalk as the cop car approaches you at a speed of 15.0 m/s, what frequency would you hear? The speed of sound is 343 m/s.

What is the total voltage in a circuit if the current passing through is 0.75 amps, and the resistance is 35 ohms?

How much power is needed to lift the 200-N object to a height of 4 m in 4 s?

1. Fluid mechanics is the study of a) how fluids do work. b) the types of fluids. c) how fluids form. d) classifying fluids. 2. Two solids in contact a) exert pressure only downward. b) exert pressure on each other.

Be sure to organize your topics into separate discussions. a. birth, life, and death of a main sequence star b. supergiants c. supernova d. neutron star e. pulsar

Which statement best describes the formation of diamonds? A. Diamonds form in talc under very low pressure. B. Diamonds form in talc under very high pressure. C. Diamonds form in kimberlites under very low pressure. D.

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

How are energy and speed related

11. Which of the following best explains velocity? A. The direction of an object in motion B. Only the change of direction of an object in motion C. The speed and direction of an object in motion D. The speed of an object in motion

Using 6400 km as the radius of Earth, calculate how high above Earth's surface you would have to be in order to weigh 1/16th of your current weight. Show all work leading to your answer OR describe your solution using 3 - 4 complete sentences.