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A detector of a fixed size measures the intensity of light emitted from two different sources. One emits spherical waves, the other plane waves. From which source does the intensity drop off faster with distance? Explain.
A driver in a car travelling at the speed of 78 km/h sees a cat km away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m.
A cylindrical conductor has resistance of R0 = 200 ? (ohms). what's the value of the new resistance in ohms
The lows note emitted by stretched string has a frequency of 50Hz.how many outcome are possible between 40Hz and 170Hz.
Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, What is the acceleration of the system
Find the ground state energy of an electron confined to a 1 D box of length 0.1 nm. Show an energy level diagram showing the first 5 levels. Calculate the wavelengths of the photons corresponding to transitions between the third level and the ground ..
A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm , and each pulse has an energy of 700 mJ. How many photons are emitted in each pulse
A 5.0 kg object is moving to the right at 4 m/s and collides with another object of mass 10 kg moving to the left at 5 m/s. Find the momentum of the combined object
A sports car crosses the bottom of a valley with a radius of curvature equal to 80 {rm m}. At the very bottom, the normal force on the driver is twice his weight. Evaluate at what speed is the car traveling?
A(n) 19_kg object floating in water has 0.24 of its volume above the surface of the water. What is the volume of the object
a fighter jet lands on the deck of an aircraft carrier. it touches down with a speed of 73.5 ms and comes to a complete
Cliff and Will support the board at each end so that it is horizontal. What force does Will apply to the board
You want to create a spherical mirror with a focal length of +15.0 cm. Will the mirror be concave or convex
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