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A glass lens has a convex surface with radius 25.0 cm and a concave surface with a radius of 50.0 cm. The glass has index of refraction of 1.51. Calculate the focal length of this lens. Is the lens converging or diverging?
Two loudspeakers are placed at either end of a gymnasium, both pointing towards each other. The sound emitted by the speakers is in phase and are of frequency of 256 Hz.
An ideal air conditioner operating on a Carnot cycle absorbes heat Q2 from a house at temperature T2 and discahrges Q1 to the outside at temperature T1, consumng elecrical energy E.
A spear fisherman is using m a laser rifle, he is standing in a stream 0.5m deep, if the laserstruck the water 5m out from the fisherman, how far was his feet from the fish
Many people mistakenly believe that the astronauts that orbit Earth are "above gravity." Calculate g for space shuttle territory 150 km above Earth's surface. suppose Earth's mass is 6.0 1024 kg, and its radius is 6.38 106 m (6380 km). Your answer..
A 0.8-kg mass is hanging from a spring with spring constant 19 N/m. Then the mass is displaced from the equilibrium by 2.3 cm and let go. What is the resulting period of the oscillation
A 0.500 kg block is attached to one end of a 4.00 g string. The other end of the string is secured to the center of a frictionless tabletop. What type of force must the tension in the string provide
a stell ball of mass m suspended by a thread of lenght l. the ball is then released when the thread is horizontal. at the bottom of this path, find the speed of the block just after collision
What is water speed along the boat during the vertical cross
In a PCM system, the number of quantization levels is 16 and the maximum lsignal frequency is 4 kHz, the bit transmission rate is
A concert loudspeaker suspended high off the ground emits 42 W of sound power. A small microphone with a 1.0 cm2 area is 43 m from the speaker. (a) What is the sound intensity at the position of the microphone
A 660 kg elevator starts from rest. It moves upward for 3.25 s with constant acceleration until it reaches its cruising speed, What is the average power of the elevator motor
A particle with charge +7.20 nC is in a uniform electric field directed to the left. What is the magnitude of the electric field
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