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A 275 kg piano slides 4.4 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. a)Calculate the force exerted by the man. b)Calculate the work done by the man on the piano. (c) Calculate the work done by the friction force. (d) What is the work done by the force of gravity? (e) What is the net work done on the piano?
A 20 {rm kg} child plays on a swing having support ropes that are 2.3 {rm m} long. A friend pulls her back until the ropes are 39.0^circ from the vertical and releases her from rest.
questionnano materials1a. outline the quantum confinement effects in quantum wellsb. outline the density of states for
A charge of 0.43 C is spread uniformly throughout a 36 cm rod of radius 7 mm. What are the volume and linear charge densities?
A cylinder with a piston contains 0.250 mol of oxygen at 240000 pascal and 355 kelvin. The oxygen may be treated as an ideal gas. The gas first expands isobarically to twice its its original volume. It is y then compressed isothermally back to its..
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.6020 N when separated by 50 cm, center-to-center.
A 1.90-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.20sin(2?t), Find the resonance angular frequency of the system
A circular radar operates at a frequency of 8 GHz and has a Diameter of 0.8 m. What is the angle at the half-power bandwidth
Find the lowest energy of the system (in eV) and list the quantum numbers of all occupied states if (a) the particles are electrons, and (b) the particles have the same mass of the electron
A 200 ohms resistor has a current of 1.5A running through it and is connected in series with 300 ohms resistor. What is the emf of the battery
A projectile of mass 2.0 kg approaches a stationary target body at 5.0 m/s. find the magnitude of the momentum of the target body
Consider a wet banked roadway, where there is a coefficient of static friction of 0.30 and a coefficient of kinetic friction of 0.25 between the tires and the roadway. what is the maximum speed the automobile can have before sliding up the banking
A cannonball is shot (from ground level) with an initial horizontal velocity of 41.0 m/s and an initial vertical velocity of 21.0 m/s. How far from where it was shot will the cannonball land
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