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An athlete at a gymnasium holds a 3.0kg steel ball in his hand. His arm is 70cm long and has a mass of 4.0kg. What is the magnitude of the torque about his shoulder if he holds his arm
a) straight out to his side, parallel to the floor?
b) straight, but 45 degrees below horizontal?
A vessel whose walls are thermally insulated contains 2.5 {rm kg} of water and 0.6 {rm kg} of ice, all at a temperature of 0.0 ^circ {rm{C}}. The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted ..
Two objects are charged and their centers are separated by 31.6 cm. Object A is charged to 61 nC and object B is charged to 54 nC. What is the magnitude of the electrostatic force between them.
If a 200 N force F1 is applied to the piston with the 4 cm diameter, Calculate the magnitude of the force F2 that can be resisted by the piston with the 10 cm diameter? Ignore the weights of the pistons.
A lighthouse that rises h1 = 43.6 ft above the surface of the water sits on a rocky cliff that extends $d$ = 20.0 ft from its base, as shown in the figure below. A sailor on the deck of a ship sights the top of lighthouse at an angle of $theta$ = 29...
A converging lens with a diameter of 26.00 cm forms an image of a satellite passing overhead. The satellite has two green lights (wavelength 500 nm) spaced 1.24 m apart.
Find out the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40.
If the mass of the child and sled is 40 {rm kg}, what average force do you need to apply to stop the sled? Use the concepts of impulse and momentum.
A flight attendant pulls her 69N flight bag a distance of 246m along a level airport floor at a constant velocity. The force she exerts is 37N at an angle of 58° above the horizontal. Find the coefficient of kinetic friction between flight bag and..
A particle of mass m is attracted to a force center with force of magnitude k/r2. Use plane ploar coordinates and find Hamilton's equations of motion.
A fisherman reels in 12 of line while landing a fish, using the constant forward pull of 35. How much work does the tension in the line do on fish.
Light travels at a constant speed of 3.0×108 m/s in a vacuum. (a) It takes light about 1.3 seconds to travel from the Earth to the Moon. Estimate the distance of the Moon from the Earth's surface, in meters.
It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.151 s, illustrate what is the average force exerted by the wall on the ball?
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