CP An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s ( Fig. P4.34 ). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck, so the only choice is to try to accelerate straight backward away from the reef. The mass of the tanker and cargo is 3.6 × 10 7 kg, and the engines produce a net horizontal force of 8.0 × 10 4 N on the tanker. Will the ship hit the reef? If it does, will the oil be safe? The hull can withstand an impact at a speed of 0.2 m/s or less. Ignore the retarding force of the water on the tanker’s hull.
CP An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s ( Fig. P4.34 ). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck, so the only choice is to try to accelerate straight backward away from the reef. The mass of the tanker and cargo is 3.6 × 10 7 kg, and the engines produce a net horizontal force of 8.0 × 10 4 N on the tanker. Will the ship hit the reef? If it does, will the oil be safe? The hull can withstand an impact at a speed of 0.2 m/s or less. Ignore the retarding force of the water on the tanker’s hull.
CP An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s (Fig. P4.34). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck, so the only choice is to try to accelerate straight backward away from the reef. The mass of the tanker and cargo is 3.6 × 107 kg, and the engines produce a net horizontal force of 8.0 × 104 N on the tanker. Will the ship hit the reef? If it does, will the oil be safe? The hull can withstand an impact at a speed of 0.2 m/s or less. Ignore the retarding force of the water on the tanker’s hull.
A commercial airliner with four jet engines, each producing 88 kN of forward thrust, is in a steady, level cruise when engine number 3
suddenly fails. Determine the distance d (measured up or down on the figure) to the resultant of the three remaining engine thrust
vectors. Treat this as a two-dimensional problem. The distance d is positive if above the center line of the airplane, negative if below.
4
88 KN
€
t
8.8 m
14.1 m
14.1 m
8.8 m
Y
88 KN
88 KN
Answer: d = i
You are designing a high-speed elevator for a new skyscraper. The elevator will have a mass limit of 2400 kg (including passengers). For passenger comfort, you choose the maximum ascent speed to be 18.0 m/s, the maximum descent speed to be 10.0 m/s, and the maximum acceleration magnitude to be 5.00 m/s2. Ignore friction.
a.)What is the minimum value of a 60.0-kg passenger’s apparent weight during the ascent?
b.)What is the minimum time it will take the elevator to descend to the lobby from the observation deck, a vertical displacement of 640 m?
Two friends are sitting in a stationary canoe. At t = 3.0 s the person at the front tosses a sack to the person in the rear, who catches the sack 0.2 s later. Which plot given shows the velocity of the boat as a function of time? Positive velocity is forward, negative velocity is backward. Neglect any drag force on the canoe from the water.
Chapter 4 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
Essential University Physics: Volume 1 (3rd Edition)
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