A2.2 kg piece of wood slides on the surface shown in the figure (Figure 1). The curved sides are perfectly smooth, but the rough horizontal bottom is 35 m long and has a kinetic friction coefficient of 0.30 with the wood. The piece of wood starts from rest 4.0 m above the rough bottom.

B A 55.0 kg ice skater is gliding along the ice, heading due north at 4.30 m/s. The ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but = 0. Suddenly, a wind from the northeast exerts a force of 3.90 N on the skater. Part A Use work and energy to find the skater's speed after gliding 100 m in this wind. Express your answer with the appropriate units. Value Submit Part B μÀ Submit VD| ΑΣΦ Provide Feedback Request Answer What is the minimum value of that allows her to continue moving straight north? Units Request Answer ? C ?

-PROBLEMS- FRICTION Do the following problems. Draw FBDs. Problems 1 - 4: Show work on a separate sheet. Problem 5: Show work on the worksheet. 1. A 1.4-kg block slides across a rough surface such that it slows down with an acceleration of 1.25 m/s2. What is the coefficient of kinetic friction between the block and the surface? 2. At a wedding reception, you notice a small boy who looks like his mass is about 25 kg running part way across the dance floor, then sliding on his knees until he stops. If the kinetic coefficient of friction between the boy's pants and the floor is 0.15, what is the friction force acting on him when he slides? 3. Joshua is playing cards with his friends, and it is his turn to deal. A card has a mass of 2.3 g, and it slides 0.35 m along the table before it stops. If the coefficient of kinetic friction between the card and the table is 0.24, what was the initial speed of the card as it left Joshua's hand? 4. An 18.0-kg box is released on a 34⁰ incline and…

Part D: What is the ratio of the kinetic energy to the potential energy when it is at 0.143m from equilibrium?  Part E: Draw a graph with kinetic energy, potential energy, and total mechanical energy as functions of time.

2 Your answer is partially correct. Try again. In the figure the pulley has negligible mass, and both it and the inclined plane are frictionless. Block A has a mass of 1.0 kg, block B has a mass of 2.2 kg, and angle e is 27 °. If the blocks are released from rest with the connecting cord taut, what is their total kinetic energy when block B has fallen 21 cm? Number 2.47 Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work SHOW HINT LINK TO TEXT LINK TO SAMPLE OBLEM LINK TO SAMPLE PROBLEM LINK TO SAMPLE PROBLEM VIDEO MINI-LECTURE 10:37 PM search ENG 4/4/2021 17 12 1home 3. 4 9. 7. 8. R. T. 00

Please show complete free body diagram and solutions. Thank you! A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coeffi-cient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction acting on the runner? (b) How far does he slide?

A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules?  b. What is the work done by friction, in joules?  c. What is the work done by gravity, in joules?  d. What is the net work, in joules?

Problem 4 (Figure B). A mass of 2 kg is projected with a speed of 3 m/s up a plan inclined 20° with the horizonal. After traveling 0.8 m, the mas comes to rest. (a) Determine the coefficient of kinetic friction. (b) Determine the speed of the block when it returns to i starting position. Draw 2 x 9.8 19.6 N 20° N Figure B "N

A 55kg painter ascends a 12kg ladder. The painter begins to slip when she is 70% up the ladder. What is μs between the ladder and floor? (Assume wall is frictionless)

A 7.80 g bullet is initially moving at 650 m/s just before it penetrates a tree trunk to a depth of 4.70 cm. (a) What is the magnitude of the average frictional force (in N) that is exerted on the bullet while it is moving through the tree trunk? Use work and energy considerations to obtain your answer.   b)  Assuming the frictional force is constant, how much time (in s) elapses between the moment the bullet enters the tree trunk and the moment it stops moving?