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Chapter 2: Q110P (page 39)
Question: On average, an eye blink lasts about 100 ms. How far does a MiG - 25鈥淔oxbat鈥� fighter travel during a pilot鈥檚 blink if the plane鈥檚 average velocity is3400 km/hr?
The distance traveled by the fighter plane in the given time is .
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The brakes on your car can slow you at a rate of . (a)If you are going 137 km/ hand suddenly see a state trooper, what is the minimum time in which you can get your car under the90 km/ hspeed limit? (The answer reveals the futility of braking to keep your high speed from being detected with a radar or laser gun). (b)Graph x vs t and v vs t for such a slowing.
You are to drive 300km to an interview. The interview is at 11.15 AM. You plan to drive at 100 km/h , so you leave at 8 AM, to allow some extra time. You drive at that speed for the first 100 km, but then construction work forces you to slow to 40 km/h for 40km. What would be the least speed needed for the rest of the trip to arrive in time for the interview?
The position of a particle moving along an x axis is given by, where x in metres and t in sec. Determine (a) the position. (b) the velocity, and (c) the acceleration of the particle at t=3 s . (d) What is the maximum positive coordinate reached by the particle and (e) at what time is it reached? (f) What is the maximum positive velocity reached by the particle, and (g) at what time is it reached? (h) What is the acceleration of the particle at the instant the particle is not moving? (Other than t=0)? (i) Determine the average velocity of the particle between t=0 and t=3 s.
An object falls a distance h from rest. If it travels 0.50h in the last 1.00 s , find
(a) the time and (b) the height of its fall. (c) Explain the physically unacceptable
solution of the quadratic equation in t that you obtain.
A ball is thrown down vertically with an initial speed of from a height of . (a) What is its speed just before it strikes the ground? (b) How long does the ball take to reach the ground? What would be the answers to (c) part a and (d) part b if the ball were thrown upward from the same height and with the same initial speed? Before solving any equations, decide whether the answers to (c) and (d) should be greater than, less than, or the same as in (a) and (b).
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