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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:e weight of the block in the drawing is 97.0 N. The coefficient of static friction between the block and the vertical wall is 0.430. (a) What minimum magnitude of the force is required to prevent the block from sliding down the wall? (Hint: The static frictional force
erted by the block is directed upward, paraliel to the wall.) (b) What minimum force is required to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.)
Block
wall
) Number
Units
p) Number
Units
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- A 2.220 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is us = 0.605 and the coefficient of kinetic friction is µ 0.255. At time t = 0, a force F 8.10 N is Us,k applied horizontally to the block. State the force of friction applied to the block by the table at times t = 0 and t > 0. t = 0 N t > 0 N Consider the same situation, but this time the external force F is 16.3 N. Again, state the force of friction acting on the block at times t = O and t > 0. t = 0 N t > 0 N * TOOLS x10arrow_forwardNeeds Complete typed solution with 100 % accuracy.arrow_forwardProblem 1: A 2.80kg block is placed on a rough (us=0.540) incline that makes an angle of 52.0° with respect to the horizontal. A pushing force horizontal to the ground is applied to the top of the block (This would make the force have an angle of 52.0° below the surface of the inclined plane, up the plane) to make the block stationary on the plane. What is the minimum pushing force needed to keep the block stationary on the plane? (10 points)arrow_forward
- A 2.220 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is µs = 0.605 and the coefficient of kinetic friction is µ = 0.255. At time t = 0, a force F = 8.10 N is m Us,k applied horizontally to the block. State the force of friction applied to the block by the table at times t = 0 and t > 0. t = 0 N t > 0 N Consider the same situation, but this time the external force F is 16.3 N. Again, state the force of friction acting on the block at times t = 0 and t > t = 0 N t > 0 N * TOOLS x10arrow_forwardDetermine two force members first. Two blocks are each pin connected to a massless horizontal link. Determine the largest P before motion cocurs. Use 0.35 and 0.3 for the friction coefficients. 45° J c 4.5 kg 3 kg B 30°arrow_forwardDetermine two force members first. Two blocks are each pin connected to a massless horizontal link. Determine the largest P before motion cocurs. Use 0.35 and 0.3 for the friction coefficients. 45° J c 4.5 kg 3 kg B 30°arrow_forward
- When the load L is 4.7 m from point C, the tension T in the cable has a magnitude of 5.4 kN. Express T as a vector using the unit vectors i and j. Assume a = 4.7 m, b = 2 m, c = 4.3m. T x j) kN L b Answer: T = (i it iarrow_forwardA student is trying to determine the critical angle (0) at which block will slide down an incline. She knows the coefficient of static friction between the incline and the block is 0.53 and the coefficient of kinetic friction is 0.44. Neglect drag. Hint: One way to solve the problem is to solve for all quantities in terms of m, e and g (but not u), then use f= uN and a trig identity to solve for 0. What is the critical angle? 13 Would the the block slide if the incline angle were 35°? cannot be det check answers I Rain to starrow_forwardA skydiver weighing 65 kg jumps out of a helicopter hovering at a height of 3 kilometers. Assume a cross-sectional area of 0.5 square meters. After thirty seconds of free fall, the skydiver deploys the parachute and the cross-sectional area becomes 40 square meters. Reproduce the model for the skydiver in Excel or VenSim. In VenSim you may have to make At quite small in order not to throw an error. Because you reach terminal velocity relatively quickly your answer should not be particularly sensitive to the value of At you choose. What is the skydiver's terminal velocity without the parachute? meters/second What is the skydiver's terminal velocity with the parachute? meters/secondarrow_forward
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