COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 47QAP
To determine
The net force needed to accelerate a car of mass
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"A 1kg particle moves along an x-axis according to v = 2 +9t - 9t2, with v in meters per second and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 4s? "
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1.) An athlete slides down from rest 40.0 meter along an icy hill which is 35 degrees from the horizontal. He then continues sliding on the level ice.
a) If the coefficient of kinetic friction between the athlete and ice is 0.20 (neglect air resistance) find speed (m/s) of athlete at the foot of the plane.
b) ) find the distance (m) from the foot of the plane to the point where he has landed to the level ice
Chapter 4 Solutions
COLLEGE PHYSICS
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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- 5. An old rope can now only safely suspend 120 kg. When the rope is tied to a beam, it hangs down with a vertical length of 12.0 m. Calculate the minimum time required for an 85 kg person starting from rest to climb the entire length of the rope without breaking it. ™arrow_forwardA rope exerts a constant horizontal force of 280 N to pull a 50kg crate across the floor. the velocity of the crate is observed to increase from 1m/s to 7m/s in a time of 2 seconds under the influence of this force and the frictional force exerted by the floor on the crate. What force would have to be applied to the crate by the rope in order for the crate to move with constant velocity? Explainarrow_forward1 J الدرجة من 2 How fast can this truck accelerate from a full stop so as not to drop the crate that is on the ?truck cargo Static friction coefficient(us)= 0.4 Dynamic friction coefficient (uk)= 0.3 Hx= 0.3 اختراحد الخيارات m/s? 9.92 O m/s? 3.92 O m/s? 5.92 O m/s? 7.92 Oarrow_forward
- 3) A crate of mass of mass 180.0 kg is pushed with intial speed of 33 m/s along a concrete floor. If the crate comes to rest after covering 30 m, determing the coeficient of kinetic friction between thecrate and the floor. A B C D E 0.435 0.476 0.615 0.492 0.532arrow_forwardelearn.squ.edu.om/mod/qui NG SYSTEM (ACADEMIC) al Physics I- Spring21 Time left 0:09:24 A dog and a sledge are on the frictionless ice of a frozen lake, 16.3 m apart but connected by a rope of negligible mass. The dog exerts a certain horizontal force (N) on the rope. If magnitudes of the sledge and the dog accelerations are 0.3 m/s? and 0.1 m/s?, respectively. How far from the dog's initial position (m) do they meet? Answer:arrow_forward25 - A diver with a mass of 70 kg jumps from the 10.0 meter high tower for a direct-vertical dive. Its movement ends at 2.50 meters below the water level. Find the average drag force exerted by the water on the diver. A) 1.50 kN B) 4.12 kN C) 3.09 kN D) 5.34 kN E) 1.05 kNarrow_forward
- HELP WITH PHYSICS PROBLEM A car has a mass of 1500 kg. If the driver applies the brakes, the maximum friction force that the tires can provide without skidding is about 7000N. If the car is moving at 20 m/s what is the shortest distance in which the car can stop safely?arrow_forward32 - A diver with a mass of 70 kg jumps from the 10.0 meter high tower for a direct-vertical dive. Its movement ends at 2.50 meters below the water level. Find the average drag force exerted by the water on the diver. a) 3.09 kN B) 5.34 kN NS) 1.50 kN D) 1.05 kN TO) 4.12 kNarrow_forward5) A 640-N hunter gets a rope around a 3200-N polar bear. They are initially stationary, 20 meters apart, on frictionless level ice. The hunter now pulls on the rope such that she and the polar bear slide closer together. This continues until they eventually meet at some point on the ice. What total distance will the polar bear have slid? a) 1.0 m b) 3.3 m c) 10 m d) 12 m e) 17 marrow_forward
- The train tracks on which a train travels exerts a 2.0x10^5 N friction force on the train, causing it to stop in 32s. Determine the average force needed to stop the train in 25s. Determine the stoping time interval if the tracks exert a 1.0x10^5 N friction force on the train.arrow_forward5. The motorcycle has a mass of 0.5-Mg and a negligible size. It passes point 'A' traveling with a speed of 15m/s, which is increasing at a constant rate of 1.5m/s². Determine the resultant frictional force exerted by the road on the tires at this instant. PA - 200 marrow_forward6 A ball with a mass of m is thrown into the air. What is the force exerted on Earth by the ball? A mballg, directed down Bmballg, directed up CmEarth& directed down Dm Earth, directed up Frictional force Fs, max Fk A B K-Static region →→→ Kinetic region → Applied forcearrow_forward
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Newton's Second Law of Motion: F = ma; Author: Professor Dave explains;https://www.youtube.com/watch?v=xzA6IBWUEDE;License: Standard YouTube License, CC-BY