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Q. A 300 kg piano slides 4.50 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.i) The force exerted by the manii) the work done by the man on the pianoiii) the work done by the friction forceiv) the work done by the force of gravityv) the net work done on the piano
A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 4.50 m from the bulb, find out (a) the average intensity of the light, (b) the rms value of the electric field, and (c) the peak value of t..
A car moving at 37 m/s approaches a stationary whistle that emits 270 Hz sound. The speed of sound is 347 m/s. What is the frequency of sound heard by the driver of the car.
A hydraulic lift consists of two pistons that connect to each other by an incompressible fluid. If one piston has an area of 0.49 m^2 and the other an area of 6.2m^2, how big a mass can be raised by a force of 220N exerted on the smaller piston.
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
Status Newton's First Law of motion.
An electric field of 300 V/m is confined to a circular area d = 11.1 cm in diameter and directed outward perpendicular to the plane of the figure. If the field is increasing at the rate of 22.0 V/m·s, what are direction and magnitude of the magnet..
A 165 pF capacitor is connected in series with an unknown capacitor, and as a series combination they are connected to a battery with emf of 21.3 V. If the 165 pF capacitor stores 112 pC of charge on its plates, what is the unknown capacitance.
Two charged bodies exert a force of .145N on each other. If they are now moved so they are one fourth as far apart, what force is exerted.
A car is driven 175km west and then 55km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
The temperature of the glass surface of a 30 W light bulb is 75°C when the room temperature is 10°C. Estimate the temperature of a 150 W light bulb with a glass bulb the same size. Consider only radiation, and assume that 90% of energy is emitted as ..
In daily life we see many cases of people who are caught misrepresenting things who soon thereafter are excused and accepted by their contemporaries. How is This different in science.
A solenoid of radius 1.1 cm produces a magnetic field at its center is 0.28 T. What is the magnetic flux by the center of the solenoid.
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