When a jet airplane takes off, how is momentum conserved?
a. Momentum is conserved because the jet of hot air pushes on the atmosphere around it.
b. Momentum is conserved because the air rushing out of the jet engine is moving out in the direction opposite to the plane's movement.
c. Momentum is not conserved because the jet was motionless and is now moving.
d. Momentum is conserved because molecules in the air move on average in all directions.
e. Momentum is conserved because the jet is collecting oxygen from the atmosphere.
b
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If you add two vectors with magnitudes of 200 and 40, which of the following is the only possible resultant?
A. 100 B. 260 C. 0 D. 200 E. 40
The transition from single to multicellular life took over two billion years
Indicate whether the statement is true or false
Two balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down an incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere B) Both reach the bottom together. C) The large sphere D) It depends on the height of the incline. E) It depends on the length of the inclined surface.
A Carnot cycle consists of
A) four adiabats. B) two adiabats and two isotherms. C) two isobars and two isotherms. D) two adiabats and two isobars. E) four isotherms.