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Even the best mirrors absorb or transmit some of the light incident on them. The highest-quality mirrors might reflect 99.997% of incident light intensity. Suppose a cubical "room," 2.14 m on an edge, were constructed with such mirrors for the walls, floor, and ceiling. How slowly would such a room get dark? Estimate the time required for the light level in such a room to fall to 1.00% of its initial value after the only light source in the room is switched off. (Assume that the average distance light travels between reflections is half of the maximum possible distance.)
Two ice skaters, Daniel (mass 63.1 kg ) and Rebecca (mass 45.9 kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, What is the direction of Daniel's velocity after the collision
Two runners of mass 70 kg and 60 kg,respectively, have a total linear momentum of 350 kg*m/s. The heavier runner is running at 2.0m/s. Examine the possible velocitis of the lighter runner.
IP At a certain distance from the center of the Earth, a 5.0- object has a weight of 3.0 . Find this distance. By what factor does its initial acceleration change
A 150 Newton horizontal force pushes a 20 kg mass sitting on a horizontal surface. Additionally, the horizontal surface exerts a 50 Newton frictional force on the mass. find the hydroxide-ion concentration of this solution
a parallel-plate capacitor has an area of 5.50 cm2 and the plates are separated by 1.06 mm with air between them. it
A circular coil of 15 turns and area 4.0 cm^2 carries a current of 1.2 A. What is the resultant force acting on this coil
For the neutral chlorine atom 35,17 CL, determine the mass number and number of protons
A 3.6kg block on a incline that is measured as 45 degrees from the horizontal. uk = 0.2. A] how much does the friction force due during this distance?
Describe how she investigates which of the two surfaces is the best absorber of heat radiation.
Define a spectrum and discuss how spectra are used in astronomy. Explain how emission and absorption lines are produced and discuss the information they convey. Describe how the spectrum of an object emitting thermal radiation can be used to find the..
a car traveling at 36.4 ms takes 27.0 minutes to travel a certain distance according to the drivers clock in the car.
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that it's density is p. What is the density of the enlarged sphere
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