Rita raises a 10kg package to a height of 2.5 m in 2.0 s
(a) How much work did she do on the package?
(b) How much power was expended on the package?
(c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
(a) 0.25 Kj (b) 0.12 kW (c) the same work, but the power doubles
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Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-1. How many revolutions does she complete in the 16-minute period?
A. 8 B. 12 C. 16 D. 20 E. 40
A piano wire has a radius of 0.500 mm. One end is fixed and the other is wrapped around a tuning peg that has a diameter of 3.00 mm and is 70.0 cm away. After the wire just becomes taut, the peg is given one and a half turns
What is the fundamental frequency of oscillation of the wire? The density of steel is 7860 kg/m3 and Young's modulus for steel is 20 × 1010 N/m2. A) 1020 Hz B) 512 Hz C) 2050 Hz D) 342 Hz E) 256 Hz
Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
A) 1.16° B) 15° C) 41.8° D) 65.2° E) 87.4°
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500 c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500 c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500 c relative to the second stage
Relative to Earth, the speed of the third stage will have a magnitude of a. 0.500 c. b. 0.800 c. c. 0.929 c. d. 0.972 c. e. 1.500 c.