m A box is being pulled to the right at steady speed by a rope that angles upward. In this situation: Select one: a. n = 0 b. n = mg с. n < mg d. Not enough information e.n > mg
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- You want to lift a heavy box with a mass L = 89.0 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. L kg NA block with some mass m is connected to a string that is attached to the ceiling. The block on the end of the string is going around a circular path with a constant radius r and constant speed. Applying Newton's second law to the x and y components of forces seperately in order to find the expressions for the tension of the string in terms of mass m, angle θ, and constant g.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 N
- A 38.0-kg child swings in a swing supported by two chains, each 3.08 m long. The tension in each chain at the lowest point is 420 N. (a) Find the child's speed at the lowest point. m/s (b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.) N (upward) Need Help? Read Master14. A 66.0 kg skier with an initial velocity of 9.30 m/s slides up a slope of 35.0° to a height of 2.50 m above where she started. The coefficient of kinetic friction is 0.0750. a. Find the force due to friction on the hill. b. Find the skier's velocity at the top of the hill. V = ? KE₁ Vi 35° 2.5 mA block of mass M is suspended at rest by two strings attached to walls, as shown in the figure. T1 is measured to be 120 N and 0 = 40°. Match the answers with questions. (Hint: Draw a proper free-body diagram.) T1 T? M v What is the magnitude of T2? A. 120 N v What is the mass of the block? В. 92 N v What is the net force on the block? С. 7.7 N D. 77 N Е. 101 N F. 7.7 kg G. 143 N Н.О
- Problem 2: Princess Peach is competing in a Mario Kart race on Rainbow Road. Rainbow Road has no rails, so Peach has to be careful taking turns to make sure she doesn't fall off. There is a notoriously difficult turn on the track made up of a portion of a circle 120m in diameter. The road is angled at 30°. The track has a friction coefficient of μ = .40. Given that Peach and the car weigh 800 kg. a) Draw a free-body diagram for the car on the road. b) What is the magnitude of the normal force, and what angle does it make with the horizontal? c) Repeat part b for the the friction force d) How fast can Peach take the turn without flying or falling off the track?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.A contestant in a Winter games event pushes a 31.0 KG black of ice across a frozen Lake the coefficient of static friction is 0.1 in the coefficient of kinetic friction 0.3 calculate the minimum force he must exert to get the black moving? N What is the acceleration once it starts to move if that force is maintained? M/S2
- A 250 gram block on a 30 deg inclined plane is attached by an inextensible string going over a frictionless pulley to a 500 gram hanging weight. The static and kinetic friction coefficients are .25 and .123. What is the acceleration of the blocks in cm/s² O 376 O 563.7 O455.2 O 292.4 O 192.4A man is trying to move an object (m 14.0 kg) by pulling upward on the rope at an angle of 53° above the horizontal. The coefficient of kinetic friction is 0.300 between the object and the ground. The tension in the rope is 150 N. What is the acceleration of the object? 53 O 6.08 m/s2 O 6.86 m/s2 O 3.50 m/s2 7.77 m/s2 6.82 m/s2Suppose the force of air resistance is proportional to the speed of the object and in the direction opposite the object's velocity. If you throw an object upward, when is the magnitude of the object's acceleration highest? A. It is highest at the top of its trajectory. B The acceleration of the object is the same throughout the entire trajectory. No answer text provided. It is highest right after the object is released.