State the Conservation of Momentum for a System of Objects
What will be an ideal response?
Internal forces have absolutely no effect on the net momentum of a system. If the net external force acting on a system is zero; its net momentum is conserved
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Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. How far below the level from which it was thrown is the rock 2 seconds later?
A) 5 m B) 10 m C) 15 m D) 20 m
An astronaut falling into a black hole would see the universe
A) red-shifted. B) blue-shifted. C) with no shift at all.
The critically bound universe, with omega = 1, is saddle shaped
Indicate whether the statement is true or false
A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
a.
a net force to the left.
b.
a net force to the right.
c.
a net force upwards.
d.
no net force but a slight shift of the inner conductor to the left and the outer conductor to the right.
e.
no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.