1The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.510mg is then applied at upward angle θ = 22°.

(a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μ_s = 0.595 and μ_k = 0.495?

m/s²

 

(b) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μ_s = 0.395 and μ_k = 0.305?

m/s²

 

 

 

2. A slide loving pig slides down a certain 37° slide in twice the time it would take to slide down a frictionless 37° slide. What is the coefficient of kinetic friction between the pig and the slide?

 

 

 

 

3.  The coefficient of static friction between Teflon and scrambled eggs is about 0.050. What is the smallest angle from the horizontal that will cause the eggs to slide across the bottom of a Teflon-coated skillet?

 

 

 

 

 

 

 

4.. A loaded penguin sled weighing 84 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.21, and the coefficient of kinetic friction is 0.16.

(a) What is the minimum magnitude of the force , parallel to the plane, that will prevent the sled from slipping down the plane?

N

 

(b) What is the minimum magnitude F that will start the sled moving up the plane?

N

 

(c) What value of F is required to move the block up the plane at constant velocity?

N

 

 

 

 

 

 

 

 

 

 

5. An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1260 N. The coefficient of static friction between the box and the floor is 0.37.

(a) What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand?

°

 

(b) What is the weight of the sand and box in that situation?

N

 

 

 

 

 

 

6. Converted from HRW9 6.P.029. In the figure, blocks A and B have weights of 48 N and 26 N, respectively.

(a) Determine the minimum weight of block C to keep A from sliding, if μ_s between A and the table is 0.20.

N

 

(b) Block C suddenly is lifted off A. What is the acceleration of block A, if μ_k between A and the table is 0.15?

m/s²

 

 

 

 

 

 

7. Two blocks, of weights 4.1 N and 6.8 N, are connected by a massless string and slide down a 30° inclined plane. The coefficient of kinetic friction between the lighter block and the plane is 0.10; and the coefficient between the heavier block and the plane is 0.20. Assume that the lighter block leads.

(a) Find the magnitude of the acceleration of the blocks.

m/s²

 

(b) Find the tension in the taut string.

N

 

 

 

 

 

 

8. If a Saturn V rocket with an Apollo spacecraft attached has a combined mass of 2.2 ✕ 10⁵ kg and reached a speed of 19.4 km/s, how much kinetic energy would it then have?

J

 

 

 

AccountingQueen

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Status NEW Posted 25 Aug 2017 02:08 PM My Price 10.00

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