A ball is thrown straight up with a speed of 30.0 m/s. What is the maximum height reached by the ball?
A. 132 m
B. 92.0 m
C. 45.9 m
D. 21.3 m
C. 45.9 m
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As shown in the figure, a container has a vertical tube, whose inner radius is 32.00 mm, connected to it at its side. An unknown liquid reaches level A in the container and level B in the tube level A being 5.0 cm higher than level B. The liquid supports a 20.0 cm high column of oil, between levels B and C, whose density is 460 kg.m-3. What is the density of the unknown liquid?
A. 1800 kg/m3
B. 1600 kg/m3
C. 1400 kg/m3
D. 2000 kg/m3
E. 1700 kg/m3
Are small ripples sent out across the surface of a lake truly "waves", as that word is used in physics?
A) Yes, because the water itself doesn't go anyplace but simply oscillates up and down. B) No, because true water waves are longitudinal. C) Yes, because the water itself moves across the lake, away from the source of the wave. D) No, because the water's motion is "mass motion", similar to the motion of a ball that has been thrown. E) No, because the water itself doesn't go anyplace but simply oscillates up and down in one place.
A solenoid 4.0 cm in radius and 4.0 m in length has 8 000 uniformly spaced turns and carries a current of 5.0 A. Consider a plane circular surface (radius = 2.0 cm) located at the center of the solenoid with its axis coincident with the axis of the solenoid. What is the magnetic flux through this surface? (1 Wb = 1 T ? m2)
a. 63 ?Wb b. 16 ?Wb c. 0.25 mWb d. 10 ?Wb e. 5.0 ?Wb
A train slowly climbs a 600-m mountain track which is at an angle of 10.0° with respect to the horizontal. How much altitude does it gain?
a. 86.8 m c. 106 m b. 104 m d. 492 m