Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 6, Problem 51P
To determine
Minimum power rating of motor.
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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.
CHE
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
1 Points
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
-R
Chapter 6 Solutions
Physics for Scientists and Engineers, Vol. 1
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 33PCh. 6 - Prob. 34PCh. 6 - Prob. 35PCh. 6 - Prob. 36PCh. 6 - Prob. 37PCh. 6 - Prob. 38PCh. 6 - Prob. 39PCh. 6 - Prob. 40PCh. 6 - Prob. 41PCh. 6 - Prob. 42PCh. 6 - Prob. 43PCh. 6 - Prob. 44PCh. 6 - Prob. 45PCh. 6 - Prob. 46PCh. 6 - Prob. 47PCh. 6 - Prob. 48PCh. 6 - Prob. 49PCh. 6 - Prob. 50PCh. 6 - Prob. 51PCh. 6 - Prob. 52PCh. 6 - Prob. 53PCh. 6 - Prob. 54PCh. 6 - Prob. 55PCh. 6 - Prob. 56PCh. 6 - Prob. 57PCh. 6 - Prob. 58PCh. 6 - Prob. 59PCh. 6 - Prob. 60PCh. 6 - Prob. 61PCh. 6 - Prob. 62PCh. 6 - Prob. 63PCh. 6 - Prob. 64PCh. 6 - Prob. 65PCh. 6 - Prob. 66PCh. 6 - Prob. 67PCh. 6 - Prob. 68PCh. 6 - Prob. 69PCh. 6 - Prob. 70PCh. 6 - Prob. 71PCh. 6 - Prob. 72PCh. 6 - Prob. 73PCh. 6 - Prob. 74P
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- A 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 cross-country skier slides horizontally along the snow and comes to rest after sliding a distance of 25 m. If the coefficient of kinetic friction between her skis and the snow is ?k = 0.050, determine her speed at the start of the slide.arrow_forwardA 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_forward
- John 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 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 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
- Please Asaparrow_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_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_forward
- A horizontal force of 12 newtons is applied to a 4.0 kg box that slides on a horizontal surface. The box starts from rest, moves a horizontal distance of 10 meters, and obtains a velocity of 5.0 m/s. The surface has friction. The friction force, assumed constant is what?arrow_forwardA parachutist whose mass is 80 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-sec/m when the chute is closed and b, = 90 N-sec/m when the chute 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.arrow_forwardA 5,0 kg block starts sliding from rest, at a height of 1,0 m on a slope of 15º, without friction. After it leaves the slope it slides over a horizontal table top where the coefficient of kinetic friction is 0,25. Calculate the total distance that the block covers from when it starts sliding to when it stops.arrow_forward
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