*109. D The central ideas in this problem are reviewed in Multiple-Concept Example 9. One block rests upon a horizontal surface. A second identical block rests upon the first one. The coefficient of static friction between the blocks is the same as the coefficient of static friction between the lower block and the horizontal surface. A horizontal force is applied to the upper block, and the magnitude of the force is slowly increased. When the force reaches 47.0 N, the upper block just begins to slide. The force is then removed from the upper block, and the blocks are returned to their original configuration. What is the magnitude of the horizontal force that should be applied to the lower block so that it just begins to slide out from under the upper block?

A rifle with a barrel length of 60 cm fires a 14 g bullet with a horizontal speed of 350 m/s. The bullet strikes a block of wood and penetrates to a depth of 14 cm. You may need to review (Page 131). For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Ready for takeoff. Part A What resistive force (assumed to be constant) does the wood exert on the bullet? Express your answer with the appropriate units. fk = Submit LO Part B μÀ - 11812.5 N Previous Answers Request Answer X Incorrect; Try Again How long does it take the bullet to come to rest after entering the wood? Express your answer with the appropriate units. μA t = 0.000533 ? S ?

A block of mass 5.00 kg is initially at rest on a horizontal table. A string connects this block to another block of mass m = 2.00 kg that is suspended some distance above the ground. The string runs over a pulley. Ignore the mass of the string and pulley and assume the pulley is frictionless. The table has a coefficient of static friction of 0.48 and a coefficient of kinetic friction of 0.35.a) Draw a free-body diagram for the 5.00 kg block.b) Draw a free-body diagram for the 2.00 kg block.c) Is the system in equilibrium? Answer yes or no and justify your answer.d) If your answer to (c) is YES, what is the tension in the string? OR   If your answer to (c) was NO, what is the magnitude of the acceleration of the system?

A ladder of weight W stands on a rough floor and rests against a frictionless wall, illustrated above. It is only stable if the angle between the ladder and the ground is greater than theta (theta > 60 degree). a. Find the coefficient of static friction between the floor and the ladder. b. A child of weight 4W places the ladder against the wall at angle 70 degree(theta = 70 degree). Calculate how far up the ladder it is safe for the child to climb.

Please help with all parts, it is one question.   A. Two blocks are positioned on surfaces, each inclined at the same angle of 50.3 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 4.97 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.200. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the RIGHT at a constant velocity?        4.26 kg        6.95 kg        3.55 kg        4.97 kgB. Two blocks are positioned on surfaces, each inclined at the same angle of 45.1 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 7.86 kg, and the coefficient…

A 32 kg crate rests on a horizontal floor, and a 61 kg person is standing on the crate.(a) Determine the magnitude of the normal force that the floor exerts on the crate. N(b) Determine the magnitude of the normal force that the crate exerts on the person. N

None

A monkey of mass m = 10.0 kg is holding on to two vines each of length l = 3.00 m. The vines form an angle with the horizontal of 40.0 degrees (see figure). The monkey is not moving and the vines are considered massless and not stretchable.   a. What is the distance d between the mounting points of the vines at the top? b. Draw a free body diagram of the monkey and indicate all forces.

D Question 12 A moose pulls a 230-kg sled across a flat surface. The moose is connected to the sled by a rope that is angled 35 degrees from the horizontal direction, and the moose creates a constant tension of 850 N in the rope. Assume that friction between the sled and the ground is negligible. If the moose and sled start out motionless and the moose pulls the sled 19 meters across the ground, when is the moose pulling with the maximum amount of power? At the end. At the start The power is the same the whole time. Question 13 A moose pulls a 205-kg sled across a flat surface. The moose is connected to the sled by a rope that is angled 31.3 degrees from the horizontal direction, and the moose creates a constant tension of 864 N in the rope. Assume that friction between the sled and the ground is negligible. If the moose and sled start out motionless and the moose pulls the sled 33 meters across the ground, what is the final speed of the sled? Answer in m/s, giving the number only,…

A B Let's revisit a previous problem and add the force of friction. In the figure, block A has a mass of 2.67 kg. It rests on a smooth but not frictionless horizontal table and is connected by a very light horizontal string over an ideal pulley to block B, which has a mass of 2.82 kg. The coefficient of kinetic friction between block A and the table is 0.210. When block B is gently released from rest, how long does it take block B to travel 0.713 m? Be sure all quantities are expressed in standard units before calculating anything. Report your answer in seconds.