A baseball is thrown vertically upward and feels no air resistance. As it is rising
A) both its momentum and its mechanical energy are conserved.
B) its momentum is not conserved, but its mechanical energy is conserved.
C) both its momentum and its kinetic energy are conserved.
D) its kinetic energy is conserved, but its momentum is not conserved.
E) its gravitational potential energy is not conserved, buts its momentum is conserved.
B
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The predictions of special relativity can sound implausible at first. Which of the following provide observational evidence that the theory is correct?
A) Subatomic particles in accelerators exhibit effects of time dilation and mass increase at high speeds. B) Light is always observed to travel at the same speed. C) Time dilation can be observed in airplanes. D) All of the above are correct.
The frequency of a microwave signal is 9.76 GHz. What is its wavelength in meters?
A) 3.07 × 10-2 m B) 2.07 × 10-2 m C) 1.07 × 10-2 m D) 5.07 × 10-2 m E) 4.07 × 10-2 m
A rectangular wooden block measures 10.0 cm × 4.00 cm × 2.00 cm. When the block is placed in water, it floats horizontally, with its bottom face 1.65 cm below the surface. What is the density of the wood? The density of water is 1.00 g/cm3
A) 0.606 g/cm3 B) 1.65 g/cm3 C) 1.21 g/cm3 D) 0.350 g/cm3 E) 0.825 g/cm3
What is an electromagnet?
a. All magnets are electromagnets. b. An unscientific term based on confusing electricity with magnetism. c. An electrical coil wrapped around an iron core. d. Another name for a magnetic pole. e. A device that attracts electrons.