A beaker is filled to the 500-ml mark with alcohol. What increase in volume (in ml) does the beaker contain when the temperature changes from 5°C to 30°C? (Neglect the expansion of the beaker, evaporation of alcohol and absorption of water vapor by alcohol.) ?alcohol = 1.12 × 10^?4/°C
a. 0.47
b. 0.93
c. 1.4
d. 1.7
e. 2.5
c
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A jet of water flowing from a hose at 15 m/s is directed against a wall. If the mass flow in the fluid stream is 4.3 kg/s, what force is the water applying to the wall if backsplash is negligible?
a. 30 N c. 65 N b. 40 N d. 127 N
Which is a key difference between electric charges and magnetic poles?
a. Electric charges can be separated while magnetic poles always occur together as opposite poles of equal strength. b. Magnetic monopoles exist but isolated electric charges are never found. c. Like electric charges repel but like magnetic poles attract. d. An electrically charged rod attracts an electrically neutral object but a magnet does not attract and unmagnetized chunk of iron. e. In electricity, unlike charges repel, but in magnetism, unlike poles attract.
Two ice skaters push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s. What speed does the 60-kg skater acquire?
A) 0.500 m/s B) 0.281 m/s C) 0.375 m/s D) 0.750 m/s E) 0 m/s
In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the Earth using a pendulum 11.0 m long, which was set up in the Paris Observatory. What was the period of oscillation of the pendulum?
A) 6.65 s B) 5.63 s C) 1.79 s D) 2.12 s E) 2.58 s