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

Physics & Space Science

You might also like to view...

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°

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science

Exhibit 12-1 The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track. ? ? 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

Physics & Space Science