Two cranes are lifting identical steel beams at the same time. One crane is putting out twice as much power as the other. Assuming friction is negligible, what can you conclude is happening to explain this difference?
a) The crane with double the power must be lifting its beam four times as fast.
b) The crane with double the power must be lifting its beam twice as fast.
c) The crane with double the power must be lifting its beam twice as slowly.
d) The crane with double the power must be lifting its beam four times as slowly.
Ans: b) The crane with double the power must be lifting its beam twice as fast.
You might also like to view...
A slice of bread contains about 90 kcal. If specific heat of a person were 1.00 kcal/kg•°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?
a. 2.25°C c. 1.43°C b. 1.86°C d. 1.29°C
Evidence for the big bang comes from
A) observations of the pulsations of distant neutron stars. B) observation of the cluster of stars near the center of the Milky Way galaxy. C) the observation that the galaxies are all receding from each other. D) All of the above. E) None of the above.
The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots. B) convection zones. C) coronal holes. D) solar prominences. E) Great Dark Spots.
Archimedes' principle applies to
A) liquids. B) gases. C) fluids. D) all of the above