A point on the rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s2 . What is the angular speed of a point 0.075 m from the center of the disk?
a. 0.89 rad/s
b. 1.6 rad/s
c. 3.2 rad/s
d. 5.8 rad/s
d
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Impedance: What resistance must be put in series with a 30-mH inductor at 4000 Hz to have a total impedance of 8.0 × 104 ??
A. 30 × 104 ? B. 5.0 × 104 ? C. 6.0 × 104 ? D. 7.0 × 104 ? E. 8.0 × 104 ?
Which of the following are not relativistically invariant quantities?
a. the speed of light, c b. time c. mass d. energy
A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20 kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.250 cm2 . If the time for the sculpture to stop was 1.00 ms, the pressure on his temple, in
N/m2, was a. 8.89 × 10^4. b. 1.65 × 10^5. c. 1.65 × 10^6. d. 8.89 × 10^8. e. 1.65 × 10^9.
In a sequence of rock layers we find trilobite fossils at the bottom of rock layer 1 and dinosaur fossils directly above the fossil trilobites in layer 2. There are inclusions of trilobites in layer 2. We conclude that
A) dinosaurs were extinct long before trilobites came into existence. B) dinosaurs are from the Cambrian Period. C) by inclusion and faunal succession, layer 1 is older than layer 2. D) there is no time gap between the rocks.