Escape velocity is the speed required to:
A) orbit an object.
B) overcome the gravitational pull of an object.
C) overtake an object in orbit and pass it.
D) keep from falling out of orbit around an object.
E) maintain a constant distance from an object.
B
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The process of removing an electron from a stable nucleus is known as
a. ionization. b. Doppler broadening. c. collisional broadening. d. a red shift. e. quantum mechanics.
Are cosmic rays electromagnetic waves? Why or why not?
What will be an ideal response?
A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 ?) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 ?t) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
a. 50 mA b. 1.6 A c. 0.32 A d. zero e. 0.80 A
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively
An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -470 x B) -190 x C) -240 x D) -320 x E) -300 x