A train slowly climbs a 400-m mountain track which is at an angle of 8.0° with respect to the horizontal. How much altitude does it gain?
a. 55.7 m
b. 200 m
c. 60.7 m
d. 396 m
e. 400 m
a
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Suppose that you can crush an aluminum can by dropping a rock of mass m on it from a height h. Which of the following scenarios would crush two cans?
A. dropping a rock of mass 2m from height h B. dropping a rock of mass m from height 2h C. dropping a rock of mass 1/2m from height 4h D. all of the above E. none of the above
The velocity of a transverse wave on a stretched string or cord depends only on the tension in the cord
Indicate whether the statement is true or false
The highest mountain on Mars is Olympus Mons, rising 22 000 meters above the Martian surface. If we were to throw an object horizontally off the mountain top, how long would it take to reach the surface? (Ignore atmospheric drag forces and use gMars = 3.72 m/s2.)
a. 1.8 minutes b. 2.4 minutes c. 3.0 minutes d. 0.79 minute
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. D) An electron has a negative electrical charge. E) Electrons have very little mass compared to protons or neutrons.