John coasts on his skateboard at a speed of 1 m/s. He uses his foot to increase his speed to 3 m/s. If he has a mass of 95 kg, what impulse does he
apply?
A. 285 kg•m/s
B. 95 kg•m/s
c. 190 kg•m/s
D. 145 kg•m/s

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon