To explain its magnetic field, Europa must have an ocean of
A) molten iron.
B) hydrogen.
C) ammonia ice.
D) liquid water.
E) liquid methane.
D
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Omar throws a rock down with speed 12.5 m/s from the top of a tower. The rock hits the ground after 1.50 s. What is the height of the tower? (air resistance is negligible)
a. 24.0 m b. 21.0 m c. 30.0 m d. 54.0 m e. 45.0 m
When is the angular momentum of a system constant?
A) Only when its total kinetic energy is constant. B) Only when the linear momentum and the energy are constant. C) Only when no net external torque is exerted on the system. D) Only when the moment of inertia is constant.
An object is rotating with an angular momentum of magnitude 20.0 kg?m2/s in a direction directly east. A torque of magnitude 10.0 N?m acts in a direction 30° north of east acts on the object for 5.00 s
What is the angular momentum after the torque has acted? A) 45.0 kg?m2/s, 51.3° north of east B) 68.1 kg?m2/s, 21.5° north of east C) 25.0 kg?m2/s, 51.3° north of east D) 63.3 kg?m2/s east E) 32.0 kg?m2/s, 51.3° north of east
If Taurus is now rising at sunset, which constellation will rise at sunset next month?
A) Aries B) Scorpius C) Aquarius D) Gemini E) Pisces