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.
Lucy boards a crowded bus as it sits in the station. There are no available scats, so Lucy stands in the center aisle next to a
support pole. As the bus starts moving forward and picks up speed, Lucy holds the pole tightly to avoid falling
over backward.
While the bus is speeding up, what is the direction of the total force (if any) on Lucy?
O the total force is zero
O backward
O forward
As the bus drives down a straight road at a constant specd, Lucy has no trouble keeping her balance.
During this time, what is the direction of the total force (if any) on Lucy?
backward
the total force is zero
O forward
The bus comes to a sudden stop at a red light, and Lucy grips the pole tightly to avoid falling over forward.
During this time, what is the direction of the total force (if any) on Lucy?
O the total force is zero
O forward
O backward
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.
Do F only
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