A figure skater on ice with arms extended, spins at a rate of 3.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater's kinetic energy change when he draws his arms in?
a. 2.4 b. 1.7
c. 0.58 d. 0.12
b
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Given that a force vector extends from the origin to (120 N, -60.0 N), find the magnitude of the vector.
A. 140 N B. 134 N C. 180 N D. 60.0 N
The closest terrestrial analog to hours of right ascension is angle of longitude
Indicate whether the statement is true or false
A camera is used to photograph the full moon, which has an angular diameter of 0.53°. The image on the film is 2.3 mm in diameter. What is the focal length of the lens?
a. 2.3 mm b. 500 mm c. 250 mm d. 790 mm e. 25.5 mm
A constant magnetic field of 0.50 T is applied to a rectangular loop of area 3.0 × 10-3 m2. If the area of this loop changes from its original value to a new value of 1.6 × 10-3 m2 in 1.6 s, what is the emf induced in the loop?
A) 1.6 × 10-2 V B) 0 V C) 7.5 × 10-2 V D) 4.4 × 10-4 V E) 9.0 × 10-2 V