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The illumination at a point is inversely proportional to the square of the distance of the point from the light source and directly proportional to the intensity of the light source. If two light sources are 30 feet apart and their intensities are 70 and 50 respectively, at what point will the sum of their illumination be minimum?
a 30 ohm resistor has a voltage difference of 3 voltz across its leads. what is the power being dissipated in this resistor
A 18.0 m tall hollow aluminium flagpole is equivalent in strength to a solid cylinder of aluminium 3.50 cm in diameter. A strong wind bends the pole much as a horizontal force of 900N exerted at the top would. How far to the side does the top of the ..
A laser with a power output of 2.10 mW at a wavelength of 425 nm is projected onto calcium metal. Given the binding energy is 2.28 eV, how many electrons per second are ejected
A large parallel plate capacitor has plate separation of 0.90 cm and plate area of 283 cm2. How much work is done on the capacitor as the plate separation is increased to 1.80 cm
Elucidate what was the magnitude of the centripetal acceleration of the rock when it was on the string? What was its speed when it was on the string?
A convex mirror has a focal length of magnitude 6.23 cm. (a) If the image is virtual, what is the object location for which the magnitude of the image distance is one third the magnitude of the object distance? (Enter distance in cm from the front of..
A parallel- plate capcitor of capacitance 2.0X10^-10 F is oppositely charged with 3.0x10 ^-8 C charge. The distance between the plate is 0.5mm. What is the area on each plate
A series RLC circuit has R = 50 %uF057, L = 2.7 %uF06DH, and C = 52 nF. find the rms amplitude of the current flowing through the circuit
An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 145 km/h. exactly 2.5 s after the speeder passes, police officer steps on accelerator; if the police car's acceleration is 2.10m/s^2.
1 the equation of motion of a particle in vertical shm is given by y 20 cm sin0.25 rads t. what are the particles a
a uniform 5.93 m long horizontal beam that weighs 468N is attachedto a wall by a pin connection that allows the beam to rotate. itsfar end is supported by a cable that makes an angle of 51 degreeswith the horizontal, and a 582N person is standing 1.2..
A small sphere of mass m and radius r slides down a smooth stationary large sphere of radius R under the action of gravity from a position of rest at the top. Find the value of theta at which the particle falls off
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