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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.)
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
A 206 kg cart runs into the rear end of a 102 kg cart that is stationary. What is the speed of the moving cart before the collision
An air duct in a building has a radius of 8 cm and a length of 17 m. What pressure is required to push air through the duct at a flow rate of 1.1 m3/s
A metal sphere centered at the origin has a surface charge density that has a magnitude of 24.1 nC/m2 and a radius less than 2.00 m. What is the sign of the charge on the sphere
You toss a ball straight up in the air. Immediately after you let go of it, what forces are acting on the ball
A bullet of mass 10.1 g is fired into an initially stationary block and comes to rest in the block. Find the initial speed of the bullet
At each point on the surface of the cube shown in Fig. 23-27, the electric field is parallel to the z axis. The length of each edge of the cube is 3.2 m. On the top face of the cube the electric field is in the negative z direction and has a magni..
At the interface between the steel and the brass the strain in the steel will be higher than the strain in the brass.
A series RLC circuit consists of a 96.0 ? resistor, a 7.00 mHinductor, and a 1.40 nF capacitor. What is the power supplied to the circuit if ? =1/2?0
A 3.80 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, Determine the coefficient of kinetic friction between block and ceiling
A flashlight bulb with a resistance of 40 ohm is powered with a 6 volt battery and produces 0.75W of power. what is the voltage across the battery terminals when the light bulb is on
An arrangement of two pulleys, as shown in the figure, is used to lift a 46.0-kg mass a distance of 3.20 m above the starting point. What is the change in the potential energy of the weight when it is lifted a distance of 3.20 m
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