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Chapter 2: Q103P (page 39)
Question: If a baseball pitcher throws a fastball at a horizontal speed of 160 Km/hr,how long does the ball take to reach homeplate 18.4 maway?
The time taken by ball to reach home plate is .
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A pilot flies horizontally at , at height above initially level ground. However, at time t=0, the pilot begins to fly over ground sloping upward at angle(Fig. 2-41). If the pilot does not change the airplane’s heading, at what time does the plane strike the ground?
The position of a particle as it moves along a axis is given by , with in seconds and in centimeters. (a) What is the average velocity of the particle between and ? (b) What is the instantaneous velocity of the particle at ,, and ?? (c) What is the average acceleration of the particle between and ? (d) What is the instantaneous acceleration of the particle at ,, and ?
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?
At a certain time, a particle had a speed ofin positive x direction, and 2.4 slater, its speed was 30 m/s in the opposite direction. What is the average acceleration of particle during this 2.4 sinterval?
An abrupt slowdown in concentrated traffic can travel as a pulse, termed a shock wave, along the line of cars, either downstream (in traffic direction) or upstream, or it can be stationary. Figure 2-25shows a uniformly spaced line of cars moving at speed V=25 m/stoward a uniformly spaced line of slow cars moving at speed. Assume that each faster car adds length L=12.0 m(car length plus buffer zone) to the line of slow cars when it joins the line, and assume it slows abruptly at the last instant. (a) For what separation distance d between the faster cars does the shock wave remain stationary? If the separation is twice the amount, (b) What is the Speed? (c) What is the Direction (upstream or downstream) of the shock wave?
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