Concept explainers
A crate of weight Fg is pushed by a force
Figure P5.45
(b) Find the condition on θ in terms of μs, for which motion of the crate is impossible for any value of P.
Trending nowThis is a popular solution!
Chapter 5 Solutions
Physics for Scientists and Engineers
- A 9.00-kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table (Fig. P5.7). Taking the coefficient of kinetic friction as 0.200, find the tension in the string. Figure P5.7arrow_forwardConsider the three connected objects shown in Figure P5.43. Assume first that the inclined plane is frictionless and that the system is in equilibrium. In terms of m, g, and , find (a) the mass M and (b) the tensions T1 and T2. Now assume that the value of M is double the value found in part (a). Find (c) the acceleration of each object and (d) the tensions T1 and T2. Next, assume that the coefficient of static friction between m and 2m and the inclined plane is s and that the system is in equilibrium. Find (e) the maximum value of M and (f) the minimum value of M. (g) Compare the values of T2 when M has its minimum and maximum values. Figure P5.43arrow_forwardA crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P4.83. The coefficient of static friction is s, and P is directed at angle below the horizontal. (a) Show that the minimum value of P that will move the crate is given by P=sFgsec1stan (b) Find the condition on in terms of , for which motion of the crate is impossible for any value of P. Figure P4.83arrow_forward
- A bag of cement whose weight is Fg hangs in equilibrium from three wires as shown in Figure P5.18. Two of the wires make angles 1 and 2 with the horizontal. Assuming the system is in equilibrium, show that the tension in the left-hand wire is T1=Fgcos2sin(1+2) Figure P5.18arrow_forwardAt the end of a roller coaster ride, the cars must slow to a stop, but the magnitude of the acceleration cannot exceed 1.6 g's. Given a car with a mass of 2,400 kg (including the passengers), what is the magnitude of the maximum allowable force (in N)?arrow_forwardA block of mass 3.00 kg is pushed up against a wall by a force PS that makes an angle of u5 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude ofPS that allow the block to remain stationary. (b) Describe what happens ifuPSuhas a larger value and what hap-pens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of u5 13.0° with the horizontal.arrow_forward
- A block of mass 3.00 kg is pushed up against a wall by a force PS that makes an angle of u5 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude ofPS that allow the block to remain stationary. (b) Describe what happens ifuPSuhas a larger value and what hap-pens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of u5 13.0° with the horizontal. How do you find the mininum vaule of P in a)arrow_forwardBlock A in Fig. P5.72 weighs 60.0 N. The coefficient of static friction between the block and the surface on which it rests is 0.25. The weight w is 12.0 N and the system is in equilibrium. (a) Find the friction force exerted on block A. (b) Find the maximum weight w for which the system will remain in equilibrium.arrow_forwardA contestant in a winter sporting event pulls a 43 kg block of ice in the positive horizontal direction with a rope over his shoulders across a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are µs=0.1 and µk=0.03. Calculate the minimum force F he must exert to get the block sliding in newtons? What is its acceleration in m/s2 once it starts to move, if that force is maintained?arrow_forward
- A 30-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.45, and the coefficient of kinetic friction is 0.35. What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?arrow_forwardA cougar bites a llama of mass m and drags it across some rough horizontal ground. The cougar applies a horizontal force of magnitude F, and the llama is dragged at a constant velocity. The coefficient of kinetic friction is μk. While the cougar applies the force F, the magnitude of the kinetic friction force, fk , on the llama obeys: a)F > µk m g > fk b)F = fk = µk m gc)F = fk < µk m gd)cannot answer, not enough information givene) F > fk = µk m garrow_forwardA skydiver of mass 83.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 54.4 m/s. (a) What is her acceleration when her speed is 30.0 m/s? magnitude m/s2 direction ---Direction--- upward downward (b) What is the drag force on the skydiver when her speed is 54.4 m/s? magnitude N direction ---Direction--- upward downward (c) What is the drag force on the skydiver when her speed is 30.0 m/s? magnitude N direction ---Direction--- upward downwardarrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningPhysics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning