The system of pulleys shown in the drawing is supporting a block of mass 12 kg. What is the force F with which the rope needs to be pulled if the mass of each of the pulleys are as indicated in the drawing?
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- When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.60 kg. If the biceps is connected to the forearm a distance of 2.1 cm from the elbow, how much force must the biceps exert to hold a 37 N ball at the end of the forearm at distance of 36.0 cm from the elbow, with the forearm parallel to the floor, in Newtons? Use g = 10.0 m/s2.stion 3 of 8 A 25.5 kg mass (m) is suspended by the cable assembly as shown in the figure. The cables have no mass of their own. The cable to the left (T) of the mass makes an angle of 0.00° with the horizontal, and the cable to the right (T,) makes an angle (02) of 36.4°. If the mass is at rest, what is the tension in each of the cables, T and T,? The T, 1. 7, acceleration due to gravity is g = 9.81 m/s´. | Ti T2 %23 2.Can you draw a free-body diagram of this problem? Three children are trying to balance on a seesaw, which includes a fulcrum rock acting as a pivot at the center, and a very light board 3.2 m long as shown in the figure. Two playmates are already on either end. Boy A has a mass of 45 kg, and boy B a mass of 35 kg. Where should girl C, whose mass is 25 kg, place herself so as to balance the seesaw?
- A hungry bear weighing 700 N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam (see figure below). The beam is uniform, weighs 200 N, and is 6.00 m long, and it is supported by a wire at an angle of 0 = 60.0°. The basket weighs 80.0 N. Goodies (a) Draw a free-body diagram for the beam. (Submit a file with a maximum size of 1 MB.) Choose File no file selected This answer has not been graded yet. (b) When the bear is at x = 1.00 m, find the tension (in N) in the wire supporting the beam and the components of the force exerted by the wall on the left end of the beam. T = N F, = (c) If the wire can withstand a maximum tension of 875 N, what is the maximum distance (in m) the bear can walk before the wire breaks? mTwo identical strings making an angle of 0 = 30° with respect to the vertical support a block of mass m = 15.0 kg (see below). What is the tension in each of the strings?The figure below shows a claw hammer being used to pull a nail out of a horizontal board where 0 = 25.6°. The mass of the hammer is 1.00 kg. A force of 145 N is exerted horizontally as shown, and the nail does not yet move relative to the board. Assume the force the hammer exerts on the nail is parallel to the nail. Ө 30.0 cm Single point of contact 5.00 cm (a) Find the force exerted by the hammer claws on the nail. magnitude KN direction above the horizontal (b) Find the force exerted by the surface on the point of contact with the hammer head. Ĵ) N ( Î +
- An 80 kg construction worker sits down 2.0 m from the end of a 1450 kg steel beam to eat his lunch, as shown in the figure. (Figure 1) Determine the tension in the cable under this scenario.An 75-kg diver stands at the edge of a 52 kg diving board that is 5.0 meters long, which is supported by two vertical pillars that are 1.6 meters apart, as shown in the figure. Find the magnitude and direction of the force exerted by each pillar. (Only enter magnitude of the left support here but show both the right and left in your work.) 5.0 m 1.6 mMY 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?