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Question 1: To help you think about how illuminance varies with distance, suppose a small light source is placed at the center of two transparent spheres. One sphere has a radius,R, and the other a radius,2R. L lumens of light leave the light source and travel outward toward the spheres. How does the illuminance (the lumens passing through each square meter of surface) at the inner sphere compare to the illuminance at the outer sphere,assuming no light absorption? Try to solve this problem by thinking about the following:
1) how much of the light passes through the first sphere? how much passes through the second sphere?
2)how do the surface areas of the two spheres compare?
Question 2: Since most light bulbs that you use are not true point sources of light, how do you think the answer to question 1 would change if a typical light bulb were used?
A person of mass 75 stands at the center of a rotating merry-go-round platform of radius 2.8 and moment of inertia 920. The platform rotates without friction with angular velocity 1.78. The person walks radially to the edge of the platform. Compute a..
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min. Find the drill's angular acceleration
A hotel elevator ascends 140 m with a maximum speed of 5.80 m/s. Its acceleration and deceleration both have a magnitude of 1.50 m/s2.
A radio can be tuned into a particular station frequency by adjusting the capacitance in an L-C circuit. What is the inductance L of a coil connected to this capacitor if the oscillation frequency of the L-C circuit is 1.69MHz
A slug of mass 0.100 kg moving straight upward at 50.0 m/s collides with a 0.400 kg wooden block that is 20.0 cm long on a side, What is the loss of kinetic energy immediately before/after the hit
A 0.20-kg particle moves along the x axis under the influence of a stationary object. The potential energy in SI unit is given by U(x) = 80.0x + 20.0x^2, find the turning points of the motion
A ball m=1kg rolling without slipping on a flat surface with v=.1m/s strikes the wall after which v=.08m/s. What is the amount of heat generated due to impact?
A 40.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 18.0 m, What is the centripedal acceleration of the child
The aorta carries blood away from the heart at a speed of about 40 cm/s and has a radius of approximately 1.1 cm. determine the approximate number of capillaries in the human body
A galvanometer with a full-scale sensitivity of 700?A and a coil resistance of 58? is to be used to build an ammeter designed to read 10A at full scale
A woman stands on a scale in a moving elevator. Her mass is 60.0 kg, and the combined mass of the elevator and scale is an additional 802 kg, What does the scale read (in N) during the acceleration
A defibrillator consists of a 15.3-µF capacitor that is charged to 8.4 kV. What is the average power delivered to the tissues?
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