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In a European country a bathroom scale displays its reading in kilograms. When a man stands on this scale, it reads 86.1 kg. When he pulls down on a chin-up bar installed over the scale, the reading decreases to 77.1 kg. What is the magnitude of the force he exerts on the chin-up bar?
a) Write an expression for the magnitude of the force, F, that propels the dragster forward in terms of the variables provided. b) If the track has length L, select the correct symbolic equation for how fast Vf the dragster is traveling when it fi..
An AA battery is connected to a parallel-plate capacitor having 4 diameter plates spaced 3 apart. How much charge does the battery move from one plate to the other.
How much work did the movers do pushing a 160 kg crate 10.3 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50.
A 12kg runaway grocery cart runs into a spring with spring constant 210 N/m and compresses it by 70 cm .What was the speed of the cart just before it hit the spring.
A sphere of mass M is supported by a string that passes over a pulley at the end of a horizontal rod of length L, Find the mass of the portion of the string above the rod
When in deep space, the block accelerates at 4.2 m/s^2 even as a 120 N force is applied to it. The coefficient of static friction for a particular plane and this block is 0.31. What angle can this plane make with horizontal before the object starts t..
A 1000kg sports car accelerates from 0m/s to 33m/s in 13s. What is the average power of the engine
The entrance to a large lecture room consists of two side-by-side doors, one hinged on the left and the other hinged on the right. Each door is 0.740 m wide. Sound of frequency 708 Hz is coming through the entrance from within the room.
A conducting rod slides down between two frictionless vertical copper tracks at a constant speed of 4.0 m/s perpendicular to a 0.50-T magnetic field, What is the mass of the rod?
A basketball of mass 610g and circumference 76cm is rolling without slipping on a gym floor. Treating ball as a hollow sphere, what fraction of its total kinetic energy is associated with its rotational motion.
Suppose that electrical energy costs about $0.098/(kW · hour), If the electric potential provided by the electric company was 120 V, what was the average current in all circuits in the author's house
A flea jumps straight up to a maximum height of 0.470 m. What is its initial velocity v_0 as it leaves the ground.
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