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A box is on a ramp that is at angle θ to the horizontal. As θ is increased from zero, and before the box slips, do the following increase, decrease, or remain the same: (a) the component of the gravitational force on the box, along the ramp, (b) the magnitude of the static frictional force on the box from the ramp, (c) the component of the gravitational force on the box, perpendicular to the ramp, (d) the magnitude of the normal force on the box from the ramp, and (e) the maximum value ƒs, max of the static frictional force?
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Fundamentals of Physics, Volume 1, Chapter 1-20
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Glencoe Physics: Principles and Problems, Student Edition
- A bag of cement weighing 325 N hangs in equilibrium from three wires as suggested in Figure P4.23. Two of the wires make angles 1 = 60.0 and 2 = 40.0 with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2, and T3 in the wires. Figure P4.23 Problems 23 and 24.arrow_forwardA box is on a ramp that is at angle u to the horizontal. As u is increased from zero, and before the box slips, do the following increase, decrease, or remain the same: (a) the component of the gravitational force on the box, along the ramp, (b) the magnitude of the static frictional force on the box from the ramp, (c) the component of the gravitational force on the box, perpendicular to the ramp, (d) the magnitude of the normal force on the box from the ramp, and (e) the maximum value fs,max of the static frictional force?arrow_forwardThe force P is applied to the 57-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 245 N, and (c) P = 365 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are μs = 0.27 and Uk = 0.21, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= 57 kg 17° i (b) F= i (c) F= i (d) P= i 24° H₂=0.27 H = 0.21 N N N Narrow_forward
- A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.20. (a) If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on it? (b) What is the magnitude of the friction force if a monkey applies a horizontal force of 6.0 N to the box and the box is initially at rest? (c) What minimum horizontal force must the monkey apply to start the box in motion? (d) What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started? (e) If the monkey applies a horizontal force of 18.0 N, what is the magnitude of the friction force and what is the box’s acceleration?arrow_forwardA block of mass m = 13 kg rests on an inclined plane with a coefficient of static friction of μs = 0.085 between the block and the plane. The inclined plane is L = 6.9 m long and it has a height of h = 3.15 m at its tallest point. Part (a) What angle, θ in degrees, does the plane make with respect to the horizontal? Part (b) What is the magnitude of the normal force, FN in newtons, that acts on the block? Part (c) What is the component of the force of gravity along the plane, Fgx in newtons? Part (d) Write an expression, in terms of θ, the mass m, the coefficient of static friction μs, and the gravitational constant g, for the magnitude of the force due to static friction, Fs, just before the block begins to slide. Part (e) Will the block slide?arrow_forwardA box of banana weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.20. (a) If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on the box? (b) What is the magnitude of the friction force if a monkey applies a horizontal force of 6.0 N to the box and the box is initially at rest? (c) What minimum horizontal force must the monkey apply to start the box in motion? (d) What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started? (e) if the monkey applies a horizontal force of 18.0 N, what is the magnitude of the friction force and what is the box's acceleration?arrow_forward
- A block (mass = 200.00 g) is placed on an inclined plane 45 degrees from the horizontal. The coefficient of static and kinetic friction between the block and the plane are 0.54 and 0.35, respectively. What is the frictional force between the block and the plane?arrow_forwardThe force Pis applied to the 56-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 212 N, and (c) P = 365 N. (d) What value of Pis required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are H, = 0.28 and uk = 0.24, respectively. The friction force is positive if up the incline, negative if down the incline. 56 kg 20° H, = 0.28 H = 0.24 17 Answers: (a) F= i N (b) F= i N (c) F= i N (d) P= Narrow_forwardThe force P is applied to the 54-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P= 161 N, and (c) P = 262 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are = 0.20 and μ = 0.16, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= 54 kg 13° (c) F= i (b) F= i i (d) P= i 16° H₂=0.20 H₁ = 0.16 N N N Narrow_forward
- The force P is applied to the 34-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P= 137 N, and (c) P = 202 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are μs = 0.23 and Uk = 0.19, respectively. The friction force is positive if up the incline, negative if down the incline. 34 kg 15° 18° Р H₂= 0.23 = 0.19arrow_forwardAn 8.00 kg block of steel is at rest on a horizontal table. The coefficient of static friction between the block and the table is 0.450. A force is to be applied to the block To three significant figures, what is the magnitude of that applied force if it puts the block on the verge of sliding when the force is directed (a) horizontally, (b) upward at 60.0 from the horizontal, and (c) downward at 60.0° from the horizontal?arrow_forwardA woman exerts a horizontal force of 145 N on a crate with a mass of 38.7kg. (a) If the crate doesn't move, what's the magnitude of the static friction force (in N)? (b) What is the minimum possible value of the coefficient of static friction between the crate and the floor? (Assume the crate remains stationary.)arrow_forward
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
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