The center of our galaxy lies in the direction of (but far beyond) the stars in the constellation of
a. Ursa Minor.
b. Ursa Major.
c. Sagittarius.
d. Orion.
e. Monoceros.
C
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A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) between the lens and f. E) of infinity.
An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
A) It is reduced by a factor of two. B) It is reduced by a factor of four. C) It increases by a factor of two. D) It increases by a factor of four. E) It doesn't change.
A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg)
a. 2.9 × 10^8 J b. 3.5 × 10^8 J c. 4.1 × 10^8 J d. 4.7 × 10^8 J e. 5.9 × 10^8 J
The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.80c with respect to the inertial frame of reference?
a. 1.6 s c. 2.5 s b. 1.2 s d. 3.3 s