If the position versus time graph of an object is a horizontal line, the object is
A)
moving with constant non-zero speed.
B)
moving with constant non-zero acceleration.
C)
at rest.
D)
moving with infinite speed.
E)
none of the above
C
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Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground. b. has a wavelength that is longer than the visible light emitted by the star. c. has a wavelength that is shorter than the X-rays emitted by the star. d. will not penetrate Earth's atmosphere and reach the ground and has a wavelength that is longer than the visible light emitted by the star. e. has a wavelength that is longer than the visible light emitted by the star and has a wavelength that is shorter than the X-rays emitted by the star.
Rotational Kinetic Energy: A uniform solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25° with the horizontal. What is the forward speed of the disk after it has rolled 3.0 m, measured along the plane?
A. 2.0 m/s B. 3.5 m/s C. 4.1 m/s D. 5.7 m/s E. 6.3 m/s
The vast majority of pulsars are known only from their pulses in:
A) X-rays. B) gamma-rays. C) visible light. D) microwaves. E) radio waves.
The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the moment of inertia of this molecule about its center of mass?
A) 1.5 x 10-47 kg? m2 B) 1.9 x 10-47 kg? m2 C) 9.1 x 10-48 kg? m2 D) 4.6 x 10-48 kg? m2 E) 2.3 x 10-48 kg?v