A child pulls on a wagon with a force of 75N. If the wagon moves a total of in what is the average power delivered by the child?
A) 17 W
B) 21 W
C) 22 W
D) 26 W
A
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A 4.0 kg mass has a velocity of 12 m/s to the WEST. The 4.0 kg mass undergoes an acceleration of 2.0 
to the WEST for 3.0 sec. What is the velocity of the 4.0 kg mass at the end of the 3.0 sec interval?
A. 18 m/s to the WEST B. 6.0 m/s to the WEST C. 0.0 m/s D. 6.0 m/s to the EAST E. 18 m/s to the EAST
What are stars made of?
A: Gases, primarily Hydrogen, then Helium B: Nothing but light and energy C: Trick question- we really don't know D: Pretty much the same as Earth, but with a special shell E: They're fireflies stuck in the big blue/black thing
An electron has a much smaller mass than a proton. Is it possible for an electron and a proton to have the same de Broglie wavelength?
A. Yes, if the electron is moving much faster than the proton. B. Yes, if the proton is moving much faster than the electron. C. No, this is never possible.
A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance
The time the ball remains in the air before striking the ground is closest to A) 16.2 s. B) 3.07 s. C) 3.32 s. D) 3.53 s. E) 3.64 s.