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A woman pulls a loaded sled of mass m = 75 kg along a horizontal surface at constant velocity. The coefficient of kinetic friction ?k between the runners and the snow is 0.10 and the angle ? is 42o. (a) What is the tension T in the rope? (b) What is the normal force with which the snow pushes vertically upward on the sled?
The intensity I of light from an isotropic point source is determined as a function of distance r from the source. What is the power of the source
An object of mass 3m0 moves to the right at 0.8c. Calculate its momentum and energy
A charge Q is transferred from an initially uncharged plastic ball to an identical ball 11cm away. The force of attraction is then 19mN. How many electrons were transferred from one ball to the othe
A garden hose has an internal diameter of 1.5 cm. It's connected to a sprinkler that consists merely of an enclosure with 14 holes, At what speed does it leave the sprinkler
A 1.70 kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall.
A mechanic pushes a 3.20 X 10^3 kg car from rest to a speed of v, doing 5,100 J work in the process. find the horizontal force exerted on the car
In a diffraction experiment a point (pinhole) source of wavelength 600 nm is to be used. Determine whether Fresnel or Fraunhofer diffraction applies
Carlos weighs 900N on the surface of the earth. How much would he weigh in the satellite circling earth at an altitude of 3200km? (The earth's radius is 6400 km)
A 20 liter tank of helium is at a pressure of 190 kPa at a temperature of 0 C. What is the speed of the helium atoms in the tank at this new volume
Now the gymnast (not holding any additional mass) walks directly above the right support. What is the force the left support exerts on the beam
A diverging lens (f = -11.0 cm) is located 25.0 cm to the left of a converging lens (f = 36.0 cm). What is the height of the final image
A student throws a water balloon vertically down from the top of a building. The balloon leaves the thrower's hand with the speed of 16 m/s. How fast is it traveling after 2.6 seconds.
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