A pair of wedges is used to lift a crate as shown in The crate weighs 4000 lb, the wedge angle e is Fig. 18°, and the coefficient of friction is 0.15 at all surfaces. The weight of the wedges is negligible. Determine The force P necessary to remove the wedge or to pre- vent the wedge from slipping out W
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- Researchers have found that a gecko’s foot iscovered with hundreds of thousands of small hairs (setae) thatallow it to walk up walls and even across ceilings. A single foot pad,which has an area of 1.0 cm2, can attach to a wall or ceiling with aforce of 11 N. (a) How many 250-g geckos could be suspended fromthe ceiling by a single foot pad? (b) Estimate the force per squarecentimeter that your body exerts on the soles of your shoes, andcompare with the 11 N>cm2 of the sticky gecko foot.L GAS A 48.0 kg sign hangs at the end of a bar where L = 3.10 meters in length. A cable attaches to the end of the horizontal bar and to a wall 2.60 meters above where the bar is attached to the wall. The bar has a mass of 12-kg. What is the tension in the cable? Give your answer in Newtons to 3 significant figures (no decimal places in this case).The coefficient of static friction µg between the 83-lb body and the 14° wedge is 0.37. Determine the magnitude of the force P required to begin raising the 83-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static friction Hs = 0.37 applies at this surface as well. 83 lb 14° Answers: (a) P = i Ib (b) P = i Ib
- A ladder of length L and negligible weight leans against a frictionless vertical wall making an angle O with the horizontal. The coefficient of friction between the ladder and the floor is µs. A man of weight W climbs up the ladder. Show that the maximum distance s he can climb before the ladder slips is given by s=µ„Ltan8.Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 1.30 µC charge. (Let A = 1.30 µC, B = 6.80 µC, and C = -4.32 µC.) %3D В 0.500 m 60.0° + A C magnitude N direction ° below the +x-axisA person is pushing a wheelbarrow along a ramp that makes an angle a = 43.0° with the horizontal. The wheelbarrow and L load have a combined mass of m = 26.60 kg with the center of mass at the midpoint of the length L. What is the Fx magnitude of the net force Fnet that the person must apply in order to push the wheelbarrow up the ramp at a constant velocity, while keeping the wheelbarrow in a level, horizontal Ja. orientation? Assume that the radius of the wheel is small enough to ignore. Use g = 9.81 m/s². 260.7 total force: Incorrect
- Please asapA pulley is attached to one end of a rough plank, which makes an angle of 34◦ with the horizontal. A box is held at rest on the plank by a string that is attached to the box and passes over the pulley. A bucket of water is attached to the other end of the string and hangs freely. The coefficient of static friction between the plank and the box is 0.8. The box remains at rest but is on the point of slipping up the plank. The bucket of water has mass 7.5 kg.Name the four forces acting upon the box and draw a force diagram showing them, including the angles that show their directions.A sled of mass 500kg sits at rest on a rough slope that is inclined at 10* to the horizontal. The coefficient of friction between the slope and the sled is 0.3. The sled is held in place by a wire attached to a winch. The tension in the wire is TN. a) Find the maximum possible value of T. A load of mass mkg is added to the sled, and tension in the wire is increased to 5000N in order to pull the sled and load up the slop. Given that the sled and load are pulled a distance of 100m in 80seconds, b) Work out the value of m
- the 50 lb block rests on the rough surface for which the coefficient of kin etic friction is uk=0.2A 0.50-mm-radius fishing line made of nylon is 100 m long when no forces are applied. A fish is hooked and pulls with a tension force Of 250 N. What is the elongation?A 1.5 kg block resting ina rough flat surface is pulled by a string. The string makes an angle of 20 degress with the horizontal. The coefficient of static friction between the blodk and the surface is 0.35. What is the maximum tension in the string to keep the block unmoved?