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A firefighter with a weight of 673 N slides down a vertical pole with an acceleration of 3.05 m/s2, directed downward. What are the magnitudes and directions (choose the positive direction up) of the vertical forces (a) on the firefighter from the pole and (b) on the pole from the firefighter?
q1. a dockworker applies a constant horizontal force of 79.0 to a block of ice on a smooth horizontal floor. the
A window in a house is rectangular, with height 40 cm and width 30 cm. The pressure inside the house is normal atmospheric pressure, What is the force on the window
A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. The intensity of the sound is 2.30 10-6 W/m2 at a distance of 110 m from the explosion. Find the distance from the source at which the int..
Our Sun has a radius of 7 x 10^8 meters. From the amount of thermal energy we receive on Earth, determine the average surface temperature of the Sun
A 245 kg person lays on board that is supported only on the ends and that has a mass of 12.0 kg. what is the force on either side where the board is supported
Two vehicles approach a right angle intersection and then collide. find the magnitude and direction of the final velocity of the wreck
A small package is fired off Earth's surface with an unknown launchspeed at a 40.0^\circ angle with the localhorizontal. What is the speed of the package when it reaches its maximum height
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 47.0cm . The explorer finds that the pendulum completes 110 full swing cycles in a time of 145s A. What is the magnitude of the gravitational acceleration ..
Mass m ? 20kg is released from rest from the top of a frictionless ramp of height h = 1.8 m and length d = 2.4 m. How much work does the spring do on the mass during the compression
A 3m long ladder leans against a frictionless wall. The coefficent of static friction between teh ladder and the floor is .40. What is the minimum angle the ladder can make
Young's double-slit experiment is performed with 570 nm light and a distance of 2.00 m between the slits and the screen. The tenth interference minimum is observed 7.64 mm from the central maximum. Settle on the spacing of the slits.
the mass of a copper atom is 2.58 10-25 kg and the density of copper is 8 920 kgm3 .a determine the number of atoms in
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