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A 255 kg piano slides 4.2 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 Figure 6-36(a) Calculate the force exerted by the man. N (b) Calculate the work done by the man on the piano. J (c) Calculate the work done by the friction force. J (d) What is the work done by the force of gravity? J (e) What is the net work done on the piano? j
Suppose you want to run some apparatus that is 85 from an electric outlet. What voltage will be applied to your apparatus
A current of 48.6 mA exists in a wire for 1.20 minutes. What is the rate that charge passes a point in the wire
A rotating wheel requires 2.99-s to rotate through 37.0 revolutions. What is the constant angular acceleration of the wheel
When the lights of an automobile are switched on, an ammeter in series with them reads 10.20 A and a voltmeter connected across them reads 12.10 V. What is the current through the starting motor
In an L-R-C series circuit L=0.500 H, R=380.0 ohms, and C=7.50 microF. The voltage amplitude of the source is 250.0 V. Find the rms voltage across the capacitor
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
What would be the time constant in a RC circuit when R = 200 kohms and C = 10mf? 20
A piece of glass has a temperature of 80.6 ° C. Liquid that has a temperature of 43.0 ° C is poured over the glass, determine the specific heat capacity of the liquid
A mass of .5Kg is attached to a massless spring with spring constant k=600N/m, What was the incident speed of the second mass
A standing wave on a 75.0cm long string has three antinodes. The Wavelength is .50m. If the string has linear mass density 3.78×10?5kg/m and tension 10.5N , what are the wave's frequency
A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v1 = (3.50) + (4.00 m/s), find the magnitude of the cat's centripetal acceleration
Two particles of equal mass m are at the vertices of the base of an equilateral triangle. What is the mass m' at the third vertex
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