2.20 m Pull 53.0 1.50 m
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A worker wants to turn
over a uniform, 1250 N, rectangular
crate by pulling at 53.0° on one of
its vertical sides (Fig.. The
floor is rough enough to prevent
the crate from slipping. (a) What
pull is needed to just start the
crate to tip? (b) How hard does the
floor push upward on the crate? (c) Find the friction force on the crate.
(d) What is the minimum coefficient of static friction needed to prevent
the crate from slipping on the floor?
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- in terms spiny bunou alli effect, Bernoulli Effect and Lift dict each r the paads sa aunssaud amo nor the rence without urring at e. Instead lower speed, anssaud sa APPLICATION 1. Terminal velocity is the speed at which a falling object's drag balances its weight. A particular object weighs 250 N and its terminal velocity is 50. m/s. What is the force of drag on it when it is falling at 50. m/s? When it is falting at 25 m/s? nces 2. Often, a' unwardWhat If? If the incline under m, is rough, what is the minimum value of the coefficient of static friction M for which the system will not move?Asope is strung between tuo alls parallel 0the flori A 35 Ka mass is Ahe rope at it's midpoint. This causes the Cope to Saa by la ind the tension in the cope. hung from
- A 74 kg painter stands on a uniform 30 kg platform as shown (a) Find the tension in the supporting cable (b) Find the vertical compnent of the force exerted by the pin (c) Find the horizontal component of the force exerted by the pinDetermine the reaction at the smooth wall. The top of the 15kg ladder is leaning against a very smooth wall. Assume that the mass cebter of the painter is directly above his feet and that the coefficient of friction between the horizontal ground and the ladder is 0.25.MY NOTES ASK YOU Consider the figure below. (Let w, = 130 N and w, = 55.0 N.) W, W2 (a) What is the minimum force of friction required to hold the system of the figure above in equilibrium? (b) What coefficient of static friction between the 130-N block and the table ensures equilibrium? (Enter the minimum acceptable coefficient of friction.) (c) If the coefficient of kinetic friction between the 130-N block and the table is 0.212, what hanging weight should replace the 55.0-N weight to allow the system to mc constant speed once it is set in motion?
- A uniform drawbridge must be held at a 37° angle abovethe horizontal to allow ships to pass underneath. The drawbridge weighs45,000 N and is 14.0 m long. A cable is connected 3.5 m from thehinge where the bridge pivots (measured along the bridge) and pullshorizontally on the bridge to hold it in place. What is the tension in the cable?A 129N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 5 degrees with the horizontal. What is the tension in the rope?6) The system shown in in equilibrium. A mass of 225 kg hangs from theend of the strut, which is connected by a hinge to the ground and makes anangle of 45 degrees with the ground. The strut has a mass of 45.0 kg. Asupport cable is attached from a wall to the center of the strut and it makesan angle of 70 degrees with the vertical wall. a) Find the tension in the cable holding up the strut, which make anangle of 70 degrees with the wall. b) Find the horizontal and vertical forces exerted on the strut by the hinge.
- The horizontal beam inFig weighs 190 N, and itscenter of gravity is at its center.Find (a) the tension in the cable and(b) the horizontal and vertical componentsof the force exerted on the beamat the wall.A 6.0 m long ladder AB leans against a smooth wall making an angle of 60º with the floor (Figure 3). The ladder is uniform and has a mass of 20.0 kg.(a) Determine the forces exerted on the ladder by the floor and the wall (i.e. at A and B, respectively).(b) Determine the minimum value of the coefficient of static friction to prevent the ladder from slipping.Lifting heavy furniture is a lot of work. To make things easier, movers use dollys to take advantage of the rolling movement. However, sometimes the mover can't even lift the object to get the dolly under it. That's where the dolly comes in. Assuming the refrigerator is 200N and the pry bar is 12" long and makes 30 degrees angle with the floor, what is the Net Force necessary applied straight down to lift up the fridge? What if the pry bar was 36" long?