Fill a U-tube with water and the level in both ends is the same. Water seeks its own level. Why?
What will be an ideal response?
Answer: The water in one side of the filled U-tube pushes water up the other side until the pressure at the bottom of both sides of the tube is equal. It then follows that since water pressure is dependent on depth, the equal pressures at the bottom correspond to equal depths of water in each side.
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The energy generated by the Sun is released by the _______ to make _______ nuclei
a. fusion of H nuclei; He b. fusion of He nuclei; H c. fission of H nuclei; He d. fission of He nuclei; H
A 1000-kg car is slowly picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.350. At what speed will the car begin to skid sideways?
A) 9.25 m/s B) 23.6 m/s C) 34.3 m/s D) 35.0 m/s E) 18.5 m/s
Wien's law implies that a blue star is cooler than a red star.
Answer the following statement true (T) or false (F)
In the Compton effect a photon of wavelength 
and frequency f is scattered from and electron, initially at rest. In this process
A. the photon loses energy so that the scattered photon has frequency less than f. B. the momentum is not conserved, but the energy is. C. the electron gives energy to the scattered photon so that the photon's frequency is greater than f. D. the electron gains energy from the photon so that the scattered photon's wavelength is less than f.