An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13
b. 5.56
c. 5.72
d. 5.93
e. 4.55
B
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The formula mg = kx describes a spring that is stretched by hanging an object on it. The constant k is called the spring constant. What are its units?
A) m s2/kg B) kg/s2 C) kg s2 D) s/m kg E) N m
A rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
the other two sides being perpendicular to the magnetic field. The magnitude of the torque on the loop is A) 0.0093 m?N. B) 0.025 m?N. C) 0.050 m?N. D) 0.0019 m?N. E) 0.038 m?N.
An artificial Earth satellite in an elliptical orbit has its greatest centripetal acceleration when it is at what location?
a. nearest the Earth c. between Earth and Moon b. farthest from the Earth d. between Earth and Sun
What evidence supports the theory that elliptical galaxies come from denser clouds?
A) Elliptical galaxies are denser than spiral galaxies. B) Elliptical galaxies are generally larger than spiral galaxies. C) Elliptical galaxies at high redshifts lack young, blue stars. D) Elliptical galaxies have more gas than spiral galaxies. E) Elliptical galaxies have denser stars than spiral galaxies.