A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball.
b. There is a greater residual force from the hand on A than there is on B.
c. Only gravity acts on B but there is an additional residual force from the hand on A.
d. There is an additional downwards force besides gravity on each ball.
e. The only force acting on each ball is the gravitational force.
e
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A. the force exerted by escaping neutrinos B. gas pressure C. its rapid rotation D. quantum forces E. magnetic forces
The kinetic energy of an object is quadrupled. Its momentum will change by what factor?
a. zero b. two c. eight d. four
Intrusive definition
What will be an ideal response?
A solar mass star will evolve off the main sequence when:
A) it completely runs out of hydrogen. B) it expels a planetary nebula to cool off and release radiation. C) it explodes as a violent nova. D) it builds up a core of inert helium. E) it loses all its neutrinos, so fusion must cease.