If Burl carries Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would
A) cancel to zero.
B) be equal.
C) be in dynamic equilibrium.
D) more easily support Burl and Paul.
Answer: B
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When the pressure applied to an unknown liquid is increased from 1.0 × 107 N/m2 to 5.5 × 107 N/m2, the volume of the liquid decreases by 0.70%. Calculate the bulk modulus of the liquid
What will be an ideal response?
What is the benefit of a longer exposure time when making an image?
A) It allows the detector to collect more total light. B) It allows the detector to measure rapid variations in light intensity. C) It allows the detector to record light at very short wavelengths. D) It allows the detector to achieve higher angular resolution.
Star A has a temperature 1/2 that of star B, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C. Which of the following statements about these gases must be true? (There could be more than one correct choice.)
A) The internal (thermal) energy of the gas in both flasks is the same. B) The internal (thermal) energy of the gas in the larger flask is greater than the internal (thermal) energy of the gas in the smaller flask. C) The internal (thermal) energy of the gas in the smaller flask is greater than the internal (thermal) energy of the gas in the larger flask. D) The molecules in the larger flask have the same root-mean-square speed as those in the smaller flask. E) The molecules in the smaller flask have the same average kinetic energy per molecule as those in the larger flask.