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A weightlifter stands up from a squatting position whileholding a heavy barbell across his shoulders.
1. Draw a freee-body diagram for the barbells.
2. Draw a freee-body diagram for the weight lifter.
A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.602 and the coefficient of kinetic friction is 0.327. How much force is needed to begin moving the book
An elevator has mass 550kg , not including passengers. The elevator is designed to ascend, at constant speed, What is the maximum number of passengers that can ride in the elevator
A copper block is removed from a 301?C oven and dropped into 1.20kg of water at 20.1?C. What is the mass of the copper block
Air is trapped above liquid ethyl alcohol in a rigid container. If the air pressure above the liquid is 1.11 atm, determine the pressure in the bulb inside a bubble 4.0 m below the surface of the ethanol.
Unpolarized light with an average intensity of 845 W/m2 enters a polarizer with a vertical transmission axis. What is the orientation angle of the second polarizer relative to the first one
A missile of mass 1.05 x102 kg is fired from a plane of mass4.70 x 103 kginitially moving at a speed of 2.50 x102 m/s. If the speed of the missilerelative to the plane is 1.25 x103 m/s, what is the final velocity of the plane?
A lab will soon be able to accelerate electrons at restthrough a potential voltage of 12x1012 V. what is the electron's speed after being accelerated
You pull your 18-kg suitcase at constant speed on a horizontalfloor by exerting a 43-N force on the handle, What is the normal force on the suitcase
A 0.21-kg pinecone falls 15 m to the ground, where it lands with a speed of 9 m/s, How much work was done on the pine cone by air resistance
Suppose the skateboarder shown in the drawing reaches a height of2.30 m above the right side of the semicircular ramp. He then makesan incomplete midair turn and ends up sliding down the right sideof the ramp on his back.
In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 144 N/C downward at an altitude of 240 m and 177 N/C downward at an altitude of 390 m
A 6.30 x 10 -5 H solenoid is constructed by wrapping 54 turns of wire around a cylinder with a cross-sectional area of 6.4 x 10-4 m2. Determine the change in the length of the solenoid
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