Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 6, Problem 51P
To determine
Minimum power rating of motor.
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Suppose your car approches a hill and has an intial speed of 106 km/h at the bottom of the hill. The driver takes her foot off the gas pedal and allows the car to cost up hill.
the mass of the car is 740 kg and it stops at height 21 m above the starting point.
What is the magnitutde of the average force of friction, in newtons, if the hill has as slope 2.2 degrees above the horizontal
A parachutist whose mass is 75 kg drops from a helicopter hovering 1000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is
proportional to the velocity of the parachutist, with the proportionality constant b, 30 N-secim when the chute is closed and by 100 N-secim when the chule is open if the chute does not open
until the velocity of the parachutist reaches 20 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/sec
The parachutist will reach the ground after
(Round to two decimal places as needed.)
seconds.
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Question 9 of 11
1 Points
The coefficient of kinetic friction is / Die koëffisiënt van kinetiese wrywing is:
You are pushing a crate on the flat floor of a warehouse. Starting from rest, you apply an horizontal force of 42 N, and attain a speed of 1.7 m/s over a distance 9.5 m. If the crate weighs 15 kg, find
the coefficient of kinetic friction between the floor and the crate? Give your answer with 3DDP.
ly stoot 'n krat op die plat vloer van 'n pakhuis. Jy begin vanuit rus, en oefen 'n horisontale krag van 42 N op die krat uit, en bereik 'n snelheid van 1.7 m/s oor 'n afstand 9.5 m. As die krat 15 kg weeg,
bepaal die koëffisiënt van kinetiese wrywing tussen die vloer en die krat? Gee jou antwoord met 3DDP.
Question 10 of 11
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Chapter 6 Solutions
Physics for Scientists and Engineers
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- A block of ma65 m- 2.00 kg is released from rest ot h= 0.500m above the surface of a table, at the top of a e= 30.0°incline as shown below. The coefficient of kinetic friction between the block and the incline is 0,150. The incline is fixed on a table of height H= 2.00 m. (A.) What is the velocity of the block as it leaves the incline? Use the conservation of energy. (B.) How far from the toble will the block hit the floor? m h Н -Rarrow_forwardA frictionless plane is 10.0 m long and inclined at 35.0°.A sled starts at the bottom with an initial speed of 5.00 m/sup the incline. When the sled reaches the point at which itmomentarily stops, a second sled is released from the top ofthe incline with an initial speed vi. Both sleds reach the bottomof the incline at the same moment. (a) Determine the distance that the first sled traveled up the incline. (b) Determinethe initial speed of the second sled.arrow_forwardA 10-kg box initially at rest is pulled to the right along a frictionless horizontal surface by a horizontal force of 60N, determine the speed of the box after it has moved 2.0 m.arrow_forward
- As a fish jumps vertically out of the water, assume thatonly two significant forces act on it: an upward force F exertedby the tail fin and the downward force due to gravity. A recordChinook salmon has a length of 1.50 m and a mass of 61.0 kg.If this fish is moving upward at 3.00 m/s as its head first breaksthe surface and has an upward speed of 6.00 m/s after twothirdsof its length has left the surface, assume constant accelerationand determine (a) the salmon’s acceleration and (b)the magnitude of the force F during this interval.arrow_forwardIn a circus performance, a monkey is strapped to a sled andboth are given an initial speed of 4.0 m/s up a 20.0° inclinedtrack. The combined mass of monkey and sled is 20. kg, andthe coefficient of kinetic friction between sled and incline is0.20. How far up the incline do the monkey and sled move?arrow_forwardA 60.0 kg skier with an initial speed of 15.5 m/s coasts up a 2.50 m high rise Find her final speed right at the top, in meters per second, given that the coefficient of friction between her skis and the snow is 0.37arrow_forward
- A city planner is working on the redesign of a hilly portion of a city. An important consideration is how steep the roads can be so that even low-powered cars can get up the hills without slowing down. A particular small car, with a mass of 920 kg, can accelerate on a level road from rest to 21m/s(75Km/h) in 12.5 s. Using these data, calculate the maximum steepness of a hill.arrow_forwardJohn reached a speed of 29 m/s in the downhillskiing competition. Suppose he left the slope at that speed andthen slid freely along a horizontal surface. If the coefficient ofkinetic friction between his feet and the ground was 0.27 andhis final speed was half of his initial speed, find the distance hetraveled.arrow_forwardA frictionless plane is 10.0 m long and inclined at 30.0°. A sled starts at the bottom with an initial speed of 5.50 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed v. Both sleds reach the bottom of the incline at the same moment. (b) Determine, in m/s, the initial speed of the second sled.arrow_forward
- A 65-kg ice skater coasts with no effort for 75 m until she stops. If the coefficient of kinetic friction between her skates and the ice is µk = 0.10, how fast was she moving at the start of her coast?arrow_forwardA person steps horizontally off the roof of a single-story house that is 3.1 m high. When his feet hit theground below, he bends his knees such that his torso decelerates over a distance of 0.65 m before coming to astop. If the mass of his torso is 50 kg, what is the average net force exerted on his torso over this distance?arrow_forwardA train is traveling up a 2.88° incline at a speed of 4.31 m>s whenthe last car breaks free and begins to coast without friction. (a) Howmuch time does it take for the last car to come to rest momentarily? (b) How far did the last car travel before momentarily coming to rest?arrow_forward
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