When an inflated balloon is released with its end unsealed and takes off across the room, how is momentum conserved?
a. Momentum is conserved because the balloon is displacing atmosphere molecules from the air around it.
b. Momentum is conserved because the balloon is getting smaller.
c. Momentum is conserved because the balloon is getting larger.
d. Momentum is conserved because the air molecules inside the balloon are moving out in the opposite direction from the balloon's movement.
e. Momentum is conserved because the air from the balloon pushes the air behind it.
d
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Interstellar reddening of starlight occurs because the interstellar dust preferentially ________ the blue light
Fill in the blank(s) with correct word
A hydraulic jack is used to lift a load of weight 4000 N. The load-bearing cylinder has a radius of 4 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load?
A. 100 N B. 16,000 N C. 250 N D. 1000 N E. 4000 N
The reason the planets appear to be near the ecliptic is
a. the planets revolve around the Sun in nearly the same plane b. compared to the stars, the planets are near the Sun. c. because the Sun orbits the Earth once per year. d. the ecliptic is only 23 degrees from the celestial equator. e. the planets are much nearer to us than the Sun.
The axis of rotation of a top changes its direction as the top spins because:
a. the inertia of the top keeps its orientation changing. b. conservation of rotational motion keeps the direction changing if it was changing to start. c. rotational kinetic energy causes the direction to shift. d. gravitational force exerts torque on the top. e. angular momentum is conserved.