A race track is constructed such that two arcs of radius 80 m at A and 40 m at B are joined by two stretches of straight tracks as in the figure. In a particular trial run, a driver traveled at a constant speed of 50 m/s for one complete lap. In this case, the angular speed is greatest at
2
Physics & Space Science
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If all samples of a material have identical properties and composition, it is
a. a compound. b. an element. c. a homogeneous mixture. d. an element or compound.
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A toy rocket with a mass of 300 g takes off in a vertical direction under the influence of gravity. It burns fuel at the rate of 25 g/s. The exhaust speed of the gases is 80 m/s. What is the speed of the rocket at the end of 10 seconds?
A) 145 m/s B) 480 m/s C) 40 m/s D) 0 m/s E) 382 m/s
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What is the purpose of the negative sign in Fourier’s law of conduction heat transfer?
What will be an ideal response?
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