Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 45P
To determine
To evaluate: The minimum mass of a block is to be calculated to replace the 1.0 kg block and2.0kg block moves upward.
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NEWTON'S LAWS WITH FRICTION PH 421
5 0 A 2.5 kg block is initially at rest on a horizontal surface. A
horizontal force F of magnitude 6.0 N and a vertical force P are
then applied to the block (Fig. 6-17). The coefficients of friction for
the block and surface are M,
magnitude of the frictional force acting on the block if the magni-
tude of P is (a) 8.0 N, (b) 10 N, and (c) 12 N.
= 0.40 and H = 0.25. Determine the
%3D
N.
F.
Flg. 6-17 Problem 5.
13-23. If the supplied force F = 150 N, determine the
velocity of the 50-kg block A when it has risen 3 m, starting
from rest.
1200-kg car is coasting down a 30° hill as shown in Fig. 6-4. At a time when the car's speed is 12 m/s, the driver applies the brakes. What constant force F (parallel to the road) must result if the car is to stop after traveling 100 m?
Chapter 5 Solutions
Physics Fundamentals
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- The plane below is inclined of 25 degrees. The block of mass 1 is 15Kg and mass 2 is 4Kg. If the coefficient of kinetic friction is 0.2, calculate the magnitude of the acceleration.arrow_forwardA 2.20 kg block is initially at rest on a horizontal surface. A horizontal force of magnitude 4.83 N and a vertical force are then applied to the block (Fig. 6-17). The coefficients of friction for the block and surface are µs = 0.4 and µk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of is (a) 8.00 N and (b) 12.0 N. (The upward pull is insufficient to move the block vertically.)arrow_forward15-6. A train consists of a 50-Mg engine and three cars, each having a mass of 30 Mg. If it takes 80 s for the train to increase its speed uniformly to 40 km/h, starting from rest, determine the force T developed at the coupling between the engine E and the first car A. The wheels of the engine provide a resultant frictional tractive force F which gives the train forward motion, whereas the car wheels roll freely. Also, determine F acting on the engine wheels.arrow_forward
- I i I I 2. A patient doing the triceps dip exercise weighs 700 N exclusive of the arms (Fig. 6-3). During the first 25.0 cm of the lift, each arm exerts an upward force of 355 N. If the upward movements starts from rest, what is the patient's velocity at this point? (Precaution: If a patient is prone to anterior subluxation or dislocation, this activity should not be done.) 1 | Fig. 6-3arrow_forward(B) A maintenance man (climber) tries to maintain one of the power stations located at thetop of the mountain in the situation of winter. During his work and by mistake drops hiswater bottle which then slides 100 M down the side of a steep icy slope to a point which is10 m lower than the climber's position. The mass of the climber is 60 kg and his water bottlehas a mass of 500 g.1) If the bottle starts from rest, how fast is it travelling by the time it reaches the bottomof the slope? (Neglect friction.)What is the total change in the climber's potential energy as she climbs down the mountainto fetch her fallen water bottle? i.e. what is the difference between her potential energy atthe top of the slope and the bottom of the slope? Analysis all the above situation.arrow_forward5) A chain hangs over a smooth peg, 8 meters being on one side and 12 meters on the other. Find the time required for it to slide off (a) neglecting friction and (b) if friction is eqúal to the weight of 1 meter of chain.arrow_forward
- How much force is required to be exerted on a block weighing 200lb to reach a = 10ft/s2 towards the east? Assume a kinetic friction coefficient of 0.25.arrow_forwardAn 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is?arrow_forwardA loaded penguin sled weighing80 N rests on a plane inclined atangle u 20 to the horizontal (Fig.6-23). Between the sled and theplane, the coefficient of staticfriction is 0.25, and the coefficient ofkinetic friction is 0.15. (a) What isthe least magnitude of the forceparallel to the plane, that will preventthe sled from slipping down the plane? (b) What is the minimummagnitude F that will start the sled moving up the plane? (c)What value of F is required tomove the sled up the plane at constantvelocity?arrow_forward
- A 56-kg student runs at 6.0 m/s, grabs a hanging 10.0-m-long rope, and swings out over a lake (Fig. 6–50). He releases the rope when his velocity is zero. (a) What is the angle 0 when he releases the rope? (b) What is the tension in the rope just before he releases it? (c) What is the maxi- mum tension in the rope during the swing? 10.0 m FIGURE 6–50 Problem 92.arrow_forward(B) A maintenance man (climber) tries to maintain one of the power stations iocated at the top of the mountain in the situation of winter. During his work and by mistake drops his water bottle which then slides 100 M down the side of a steep icy slope to a point which is 10 m lower than the climber's position. The mass of the climber is 60 kg and his water bottle has a mass of 500 g. 1) If the bottle starts from rest, how fast is it travelling by the time it reaches the bottom of the slope? (Neglect friction.) What is the total change in the climber's potential energy as she climbs down the mountain to fetch her fallen water bottle? i.e. what is the difference between her potential energy at the top of the slope and the bottom of the slope? Analysis all the above situation.arrow_forwardBlock B in Fig. 6-31 weighs 711 N.The coefficient of static friction between block and table is 0.25; angle u is 30; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.arrow_forward
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