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A point source emits 86.9 W of sound isotropically. A small microphone intercepts the sound in an area of 0.231 cm2, 270 m from the source. Calculate
(a) the sound intensity there and
(b) the power intercepted by the microphone.
Compute the Force of Friction (Ff) for a 5kg aluminium block being pulled with constant velocity (uniform motion), up the steel plank that is at a 30degrees angle to the horizontal.
A mass of 1.61kg stretches a vertical spring 0.31m. If the spring is stretched an additional 0.132m and released, how long does it take to reach (new) equilibrium position again.
A 10000 N car comes to a bridge during a storm and finds the bridge washed out. The 750N driver must get to the other side, What is the speed of the car just before it lands safely on the other side
you need to store 25J of energy in the magnetic field of a solenoid. The solenoid hass 100 circular turns of diameter 5.0cm, What is the energy density inside the solenoid
Given an isothermal expansion of gas from 1.0 to 2.0 cubic meters in a piston-cylinder arrangement where pressure varies according to P= 1.2 atm -.062 atm/ m^3 V, How much thermal energy was transferred
A 71.6-kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 10.0 m, Calculate the maximum acceleration experienced by the jumper
At the upper atmosphere, the Earth receives approximately 1 KW/m^2 of energy from the sun. If the sun emits energy uniformly into space, what will be the sun's total mass loss
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.11 m2 and whose thickness is 8 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 15 m2 and 0.10 ..
Net average force using the concepts of Newton’s second law.
The current in a series circuit is 6.0 A. When an additional 17.0 resistor is inserted in series, What is the resistance in the original circuit
A drop of water on a countertop reflects light from a flower held 3.10 cm directly above it. What is the focal length of the water drop
A mass is attached to a spring stretched 2.5 cm from equilibrium. What is the angular frequency of the oscillation
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