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A rectangular block of wood (M = 219 kg) floats on a calm fresh water lake with do = 22.7 cm below the water. When a dog steps on the block, the block is pushed downward so that now it floads with d = 27.5 cm beneath the water. Find the mass of the dog.
kg
the overhead cable for a street trolley is strung horizontally 5 m above the ground. What is the magnetic field at street level directly under the cable
A capacitor with an initial potential difference of 144 V is discharged through a resistor when a switch between them is closed at t = 0 s. At t = 10.0 s, What is the time constant of the circuit
a silver dollar of mass 200gm, and diameter 8cm, has a small hole punched through it at 2 cm from the center. the coin is initially at rest in a vertical plain with the hole directly under the center, what is the angular velocity of the coin at its..
A 16 cm-diameter compressed-air tank is 30 cm tall. The pressure at 20 degrees C is 140 atm. What volume would this air occupy at STP
A violinist is tuning her instrument to concert A (440Hz). Now, when she tightens her violin strings slightly she hears 4.00 beats per second. What was the frequency of her violin
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.20 10-10 T. How much energy does this wave carry through the window during a 65-s phone call
A house has well-insulated walls. It contains a volume of 75 m3 of air at 295 K. (a) Consider heating it at constant pressure. Calculate the energy required to increase the temperature of this diatomic ideal gas by 2°C. kJ (b) If this energy could be..
Two sheets of polarizing material are placed with their transmission axes at right angle to one another. What is the intensity of the transmitted light when the middle sheet is removed
A 10000 car comes to a bridge during a storm and finds the bridge washed out. The 650 driver must get to the other side, so he decides to try leaping it with his car. What is the speed of the car just before it lands safely on the other side
A solid sphere is released from rest on an incline. When it reaches the bottom, what fraction of its total kinetic energy is rotational
An unstable particle with a mass equal to 3.34 10-27 kg is initially at rest. Find the masses of the fragments
A 55.1-kg ice skater is moving at 4.00 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. Determine the force exerted by the horizontal rope on her arms
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