A 1000.0 kg car is moving at If a truck has 18 times the kinetic energy of the car, how fast is the truck moving?
A) 45 km/h
B) 63 km/h
C) 54 km/h
D) 36 km/h
Answer: A
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Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A. It is doubled. B. It stays the same. C. It is tripled. D. It is quadrupled. E. It is reduced by a factor of two.
Suppose you live at latitude 30°N. Based on the given right ascensions and declinations, which of the following stars is never visible in your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
The velocity v(t) of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -15 m/s2 B) 0 m/s2 C) 13 m/s2 D) 15 m/s2 E) -13 m/s2
A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s2 . What is its angular speed after this 7.0-s interval?
a. 0.20 rad/s b. 0.30 rad/s c. 0.46 rad/s d. 0.78 rad/s