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Exercise 19.
Repeat Exercise 3. with the contestant pulling the block of ice with a rope over his shoulder at the same angle above the horizontal as shown in Figure 5.7(b).
Which method of sliding a block of ice requires less forceA?(a) pushing or (b) pulling at the same angle above the horizontal?
This is Exercise 3.
(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee?
(b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions?
Electrons are accelerated by a potential and directed upon a thin salt crystal that has inter-atomic spacing of 0.282 cm. What was the acceleration potential
Regarding the Earth and a cloud layer 750 m above the Earth as the "plates" of a capacitor, calculate the capacitance. Assume the cloud layer has an area of 1 km2 and that the air between cloud and ground is pure and dry.
A bowling ball encounters a 0.760 mvertical rise on the way back to the ball rack, as the drawingillustrates. Find the translational speed (in m/s) at the top
A ceiling fan consists of a small cylindrical disk with 5 thin rods coming from the center. The disk has mass md = 3.3 kg and radius R = 0.22 m. The rods each have mass mr = 1.2 kg and length L = 0.76 m. 1) What is the moment of inertia of each rod a..
Mark and Clark are identical twins at the amusement park riding on the bumper cars. Both boys have the same mass, 85kg. The cars are identical with a mass of 120 kg.
A person drives a car at a constant speed of 90 km/h along a straight line from point A to point B and then drives back along the line from B to A at a constant speed 110 km/h. What is her average speed over the entire trip?
A geodesic dome constructed with an aluminum framework is a nearly perfect hemisphere; its diameter measures 56.0 m on a winter day at a temperature of 12.5°C.
Four equal point charges of +3 μC are located at the four corners of a square that is 40 centimeter on a side. Determine the force of any of the charges
An apple is located 13.6 centimeter in front of a diverging lens with a focal length of magnitude 22.4 centimeter. Obtain the magnification of the image of the apple
A 0.350kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.750m/s when it makes a head-on collision with a stationary 0.150kg glider. Find the final kinetic energy of second glider
A rifle is aimed horizontally at a target 47.0 away. The bullet hits the target 1.80 below the aim point. Evaluate the bullet's flight time? What was the bullet's speed as it left the barrel?
A sheet of glass (n = 1.50) is coated with a 500 nm thick layer of cubic zirconia (n = 2.18). How many phase changes do the reflected rays undergo
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