This graph shows the rotation curves of four different spiral galaxies. Based on these curves, what do all four galaxies have in common?
A) Their most distant stars all orbit at about the same speed as stars located about 30,000
light-years from their centers.
B) Their fastest-moving stars are always located within about 1,000 light-years of their centers.
C) They all have supermassive black holes near their centers.
D) All their stars take about 200 million years to complete a single orbit, no matter how far they are from the galactic center.
A) Their most distant stars all orbit at about the same speed as stars located about 30,000
light-years from their centers.
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Free Fall: A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A. 4T B. 2T C. T D. T/2 E. T/4
A silver dollar, a quarter, and a penny (these are in order of decreasing diameter) lie at the bottom of a wishing well filled with water. The coin experiencing the largest downward force on its top surface due to the water pressure is the
A. silver dollar. B. penny. C. quarter. D. All of these choices experience the same downward force
The electron in a doubly ionized lithium atom experiences a weaker attractive force than the single electron in a hydrogen atom
Indicate whether the statement is true or false
A device that makes use of a bimetallic strip is a
a. thermometer b. thermostat c. choke control in an old automobile d. all of the above e. none of the above