An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting?
a. It goes up, overflowing.
b. It stays the same.
c. It goes down.
d. It depends on air pressure, thus the answer is indeterminate.
C
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Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible)
The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed? A) 150 m/s B) 240 m/s C) 24 m/s D) 90 m/s
In the southern hemisphere, the vernal equinox occurs on or around
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What does it take to allow us to observe a neutron star as a pulsar?
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An object of mass 5.0 kg revolves at 600 rpm in a horizontal circle of radius 1.5 m. Determine the
a) period of the object's motion in seconds, b) object's speed, c) magnitude of the centripetal acceleration, d) magnitude of the centripetal force acting on the object.