A neutron star is expected to spin rapidly because
a. they conserved angular momentum when they collapsed.
b. they have high orbital velocities.
c. they have high densities.
d. they have high temperatures.
e. the energy from the supernova explosion that formed them made them spin faster.
A
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If a planet orbits a star in an ellipse, when the planet is at its closest approach to the star we say the planet is at
a) opposition b) aphelion d) perihelion
When you can't escape being hit by a fast-moving object, you'll suffer a smaller force if the collision time is
A) long. B) short. C) the same way either way. D) none of the above.
A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3.0 m/s2
(a) Determine the mass of the block. (b) Calculate the distance the block will travel if the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.