A hockey puck traveling at speed v on essentially frictionless ice collides elastically with one end of a straight stick lying flat on the ice. In this collision
a. momentum is conserved.
b. angular momentum is conserved.
c. energy is conserved.
d. all of the above are conserved.
e. only momentum and angular momentum are conserved.
d
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The charge on a glass rod which has been rubbed with silk is called positive:
A) by arbitrary convention B) so that the proton charge will be positive C) to conform to the conventions adopted for G and m in Newton's law of gravitation D) because like charges repel E) because glass is an insulator
Which way does the Sun appear to move along the ecliptic from day to day?
What will be an ideal response?
How does the heat Jupiter radiates compare to the energy it receives from the Sun?
A) They are equal, as you would expect for a highly reflective planet. B) Jupiter's dark belts absorb most of the solar radiation, so it is cooler in the infrared. C) Jupiter radiates back into space about twice the energy it gets from the Sun. D) Jupiter is a brown dwarf, about a hundred times less luminous than the Sun. E) Jupiter is a red dwarf, about a tenth the Sun's luminosity.
Why does it hurt more to fall from a certain height to the ground than it does to fall from the same height into a swimming pool?
What will be an ideal response?