A narrow tube is placed vertically in a pan of water, and the water rises in the tube to 4 cm above the level of the pan. The surface tension in the liquid is lowered to one-half its original value by the addition of some soap
What happens to the height of the liquid column in the tube? A) It drops to 2 cm.
B) It drops to 1 cm.
C) It remains at the same height.
D) It drops or rises, but the height cannot be calculated from the information given.
A
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One of water's interesting thermal properties is that when heated it takes a relatively
A) long time in changing temperature. B) short time in changing temperature. C) same amount of time to cool. D) none of the above
A ball is thrown at an angle ? above the horizontal. In the presence of the acceleration due to gravity, how far below the straight-line path following its original direction of motion will the ball be at the end of 1.0 second?
A) 20 m B) 4.9 m C) 9.8 m D) 2.5 m E) None of the other choices is correct.
Upon reflection, light undergoes a 180° phase change:
a. always. b. if the incident medium has the higher index of refraction. c. if the incident medium has the lower index of refraction. d. whenever the incident angle is less than the critical angle.
A 15-kg mass, attached to a massless spring whose force constant is 2 500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33