6. The motor applies a constant downward force F to the cable used to raise the 4000 lb elevator E shown in the figure. The counterweight has a weight of 2000 lb. Knowing that the elevator starts from rest and reaches a speed of 3 m/s after traveling 30 ft, determine F. W M
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- 5. A top WNBA player can jump about .7 meters off the ground. If her mass is 50 kg, what force must she exert against the ground? Assume she crouches a distance of .2 metes prior to jumping, and thus the upward force has this distance to act before leaving the ground. 6. A block is given an initial speed of 4 meters per second up the 0 = 22° plane shown below. Ignoring friction, %3D (a) how far up the plane will it go? (b) How much time elapses before it returns to its starting point? R 4m/s s 22°6. Two packages that start sliding down a 20° ramp from rest a distance d = 4.30 m. For package A: Ma = 5.00 kg and ukA = 0.30. %3D For package B: mB = 7.00 kg and ukB = 0.20. Find the speed of both packages when they reach the bottom. 20°6. Two blocks are connected by a light string passing over a light, frictionless pulley as shown in the figure. Block m1, initially at rest, is released from height h above the table. Block m,, which is the heavier block, begins to fall, while block m2 rises. a) Calculate the speed of m2 just as m¡ hits the table. b) Suppose block m, continues to rise without obstruction even after block m, hits the table. Calculate the maximum height above the table to which m2 rises. h
- 2. A6.0-kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant horizontal force of 12 N. Find the block's speed after it has moved 3.0m.i need help finding U, K, and Ea 500 N block fromtesfrom rest slides 6m down a 45 degrees slope. the 3m along a level surface and then up 30 degrees incline until it comes to rest again. the coefficient of friction is 0.15 for all surfaces. what is the distance travelled by the block up the 30 degrees inclined yntiuntil it stops. what is the total distance traveled by the block. what is the velocity when uit reach the level surface. what is the velocity of the block just before it travels up the 30 degrees inclined.
- 5. Two identical blocks, each with mass m, both at rest initially, are connected, as shown. The surface is rough with the coefficient of kinetic friction 4. If the initial height is h, what are the speeds of the blocks once the hanging block hits the ground? h44. A 15 kg child slides, from rest, down a play- ground slide that is 4.0 m long, as shown in the figure. The slide makes a 40° angle with the horizontal. The child's speed at the bot- tom is 3.2 m/s. What was the force of friction that the slide was exerting on the child? 傳 4.0 m 40°I need help with this problem please A catapult launches a rock at a 41° angle with respect to the horizontal. Find the maximum height attained if the speed of the rock at its highest point is 25 m/s.