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light of wavelength 600nm is incedent normally on a surface of area 4 cm^2. the measured light intensity is 24 x 10^-s W/m^2. Determine the power output of the light source(in uW)
A 68 kg person sits on a 4.0 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.2 cm in diameter . Find the pressure exerted on the floor by each leg of the chair, assume the weight is evenly distributed.
A helicopter has blades of length 4.0 m, rotating at 1.0 rev/s about a central hub, find the emf induced between the blade tip and the central hub
A very long solenoid with a circular cross section and radius r= 6.10 cm with n= 1.20E+4 turns/m has a magnetic energy density uB= 4.50 mJ/m3. What is the current in the solenoid
A piece of balsa wood with density 0.50g/cm^3 is released under water. What is the initial acceleration?? Repeat for a piece of maple with density 0.760 g/cm^3? Repeat for a ping-pong ball with the average density of 0.127 g/cm^3.
A 4.4 kg box is lifted by a force equal to the weight of the box. The box moves upward at a constant velocity of 3 m/s. What is the power input of the force
Three resistors having resistances of R1 = 1.74? , R2 = 2.57? and R3 = 4.83? respectively, Find the voltage across each resistor
Raindrops fall 1500 m from a cloud to the ground. If they were not slowed by air resistance, how fast would the drops be moving
A 180g block hangs from a spring with spring constant 13N/m . At t=0s the block is 13cm below the equilibrium point, What is the block's oscillation frequency
Two packages at UPS start sliding down the ramp. Package A has a mass of 6.50 and a coefficient of kinetic friction of 0.19. Package B has a mass of 9.50 and the coefficient of kinetic friction of 0.140. How long does it take package A to reach th..
What is torque exerted by the fish about an axis
An oscillating LC circuit has a current amplitude of 7.50 mA, a potential amplitude of 250 mV, and the capacitance of 220 nF. What are (a) the period of oscillation.
Two charges, +q and -q, are located in the x-y plane at points (0,+d/2) and (0,-d/2), respectively. Calculate the magnitude of the electric field at point P with the superposition principle
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