It can be shown that the change in entropy in heating or cooling a sample is given by the relation = mc ln where m is the mass of the sample, c is the specific heat of the sample, and and are the final and initial temperatures respectively. What is the change in entropy when 10.0 grams of lead with a specific heat of 0.452 J/gm K is heated from 10.0C to 50.0

src="https://sciemce.com/media/4/5ecd01164bafc272.png" class="w-image" />C?

A. 0.45 J/K
B. 0.60 J/K
C. 0.90 J/K
D. 0.30 J/K

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B. 0.60 J/K

Physics & Space Science

A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving WEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The kinetic energy lost in the collision is

A. 34.8 J. B. 28.7 J. C. 20.4 J. D. 18.7 J. E. 14.9 J.

A copper wire from a large spool is cut into two lengths to make extension cords, one 50 feet long and the other 75 feet long. Which of the following is true?

A. The longer cord will be able to carry more current B. The shorter cord will have a smaller voltage C. The shorter cord will dissipate more power D. The longer cord will have more resistance

Which of the following copper alloys can be precipitation hardened to a relatively high yield strength?

(a) Beryllium copper (b) Cartridge brass (c) Copper nickel (d) Aluminum bronze

How does a rocket take off?

A) Its rocket engines push against the launch pad, propelling the rocket upward. B) It converts mass-energy to kinetic energy. C) It achieves lift from its wings in the same way that airplanes do. D) Hot gas shoots out from the back of the rocket and, by conservation of momentum, the rocket moves in the opposite direction. E) The hot rocket exhaust expands the air beneath the rocket, propelling it forward.