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An old mining tunnel disappears into a hillside. You would like to know how long the tunnel is, but it's too dangerous to go inside. Recalling your recent physics class, you decide to try setting up standing-wave resonances inside the tunnel. Using your subsonic amplifier and loudspeaker, you find resonances at 4.5 and 5.8 , and at no frequencies between these. It's rather chilly inside the tunnel, so you estimate the sound speed to be 331 . Based on your measurements, how far is it to the end of the tunnel?
A 1.5 mm-diameter, 40 cm -long copper wire carries a 4.5 A current. What is the potential difference between the ends of the wire
A spherical drop of water carrying a charge of 28 pC has a potential of 505 V at its surface (with V = 0 at infinity). What is the radius of the drop
There are two pith balls that are suspended from a pendulum and repel each other, calculate the tension of the string and the mass of the balls
A heat engine having an ideal monatomic gas as a working substance has a cycle consisting of the following three processes: isobaric expansion at 200 kPa.
A parallel-plate capacitor with area 0.700 m2 and plate separation of 2.00 mm is connected to a 18.00-V battery. How much charge is stored on the plates
A 3.50-kg ball, moving to the right at a velocity of +2.72 m/s on a frictionless table, Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
What is average kinetic energy of each helium atom
What is the ph of a buffer that results when .40 mol nahco2 is mixed with 100 ml of 2.0 m hcl and diluted with water to 250 ml
Find out the position at which a third charge can be placed.
350J of energy are transferred to a system in the form of heat while the thermal energy increases by 160J
An airplane is flying with a velocity of 90 m/s at an angle of 25 above the horizontal. When the plane is a distance 126 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
you are on the moon and would like to send a probe into space so that it does not fall back to the surface of the moon. what launch speed do you need
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