A skier moves at constant speed straight down a slope of angle 8 Part A Ignore air resistance and find the expression for the coefficient of kinetic friction between skis and snow. Express your answer in terms of 0. |ΕΙ ΑΣΦ Hk= Submit Request Answer ?
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- You want to lift a heavy box with a mass L = 91.0 kg using the two-ideal pulley system as shown. With what minimum force do you have to pull down on the rope in order to lift the box at a constant velocity? One pulley is attached to the ceiling and one to the box. Lkg NA -20kg child slides down a playground slide with a constant acceleration of a=2.9 m/s^2 parallel to the surface of the slide. The child starts sliding with an initial speed of v0. Enter an expression for the child's speed squared, vf^2, at the bottom of the skid win terms of a, v0, and the length of the slide, d. If the slide is 4m long and the child's final speed is vf= 5.0m/s, what is their initial speed, in meters per second? When starting from rest, how long, in seconds, does it take the child to reach the bottom of the slide?m A person is pushing a wooden crate of mass mo = 20 kg at a constant speed vo = 1.2– for Ax = 3 m along a rough horizontal floor that has a coefficient of friction µk = .4.
- Blocks 1 and 2 are moving to the right on a frictionless surface by the tension TB = 36 N as shown. m1 = 2.0 kg, and m2 = 3.2 kg. What is the magnitude of the acceleration of block 2, in m/s²? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. m₁ TA m₂ TBWorkmen are trying to free an SUV stuck in the mud. To extricate the vehicle, they use three horizontal ropes, producing the force vectors shown in the figure.(Figure 1) Take F₁ = 864 NF2 = 784 N, and F3 = 384 N. Figure Part A F₂ 53° F3 32° F₁ Find the components of each of the three pulls. Enter your answer as three numbers, separated with commas. F1, F2, F32 = ΜΕ ΑΣΦ Submit Previous Answers Request Answer × Incorrect; Try Again Part B Find the y components of each of the three pulls. Enter your answer as three numbers, separated with commas. ΜΕ ΑΣΦ Fly, F2y, Fay = ? ? N N 1 of 1A block slides down a 18° incline. The coefficient of kinetic friction between the block and theincline is 0.22. What is the magnitude of the block's acceleration?
- At an accident scene on a level road, investigators measure a car's skid mark to be 88 m long. It was a rainy day and the coefficient of friction was estimated to be 0.35. a.)Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Express your answer to two significant figures and include the appropriate units.A stockroom worker pushes a box with mass 12.9 kg on a horizontal surface with a constant speed of 2.50 m/s. The coefficients of kinetic and static friction between the box and the surface are 0.340 and 0.470, respectively. For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Delivering the goods. F₂ = 43.0 N Submit ✓ Correct Part B Previous Answers a = If the worker stops pushing, what will be the acceleration of the box? Express your answer in meters per second squared. Assume that + direction coincides with the direction of velocity. ► View Available Hint(s) Submit VI ΑΣΦ Previous Answers wwww ? X Incorrect; Try Again; 3 attempts remaining Review | Constants m/s²M 30° The pulley and all surfaces are frictionless. Suppose both blocks are made of solid gold. In addition, each block has a mass of 2.08 kg. Find the tension (in N) in the connecting the two gold blocks.
- The tension at which a fishing line snaps is commonly called the line's "strength." What minimum strength is needed for a line that is to stop a salmon of weight 92 N in 12 cm if the fish is initially drifting horizontally at 2.7 m/s? Assume a constant deceleration. Number i UnitsTwo objects, A and B, are placed on an inclined plane that can be rotated to different angles of elevation. A starts and u R. Choose the last answer that is correct. HA to slide at twice the angle of elevation that B starts sliding. The respective coefficients for static friction for A and B are Select one: a. HB > HA b. HA = 2µB c. HA > HB 2H A d. в