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Water enters a horizontal pipe with a rectangular cross section at a speed of 1 m/s. The width of the pipe remains constant but the height decreases. Thirty-eight meters from the entrance, the height is half of what it is at the entrance. If the water pressure at the entrance is 4100 Pa, what is the pressure 38 m downstream?
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.29 × 10-6 T. What is the intensity S of the wave
A continuous line of charge lies along the x axis, extending from x = +x0 to positive infinity. What is the direction of the electric field at the origin
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.55s , the rate increases steadily to 6.00rev/s, What's the pulley's angular acceleration
A rescue helicopter lifts a 90-kg person straight up by means of a cable, What is the tension in the cable and How much work is done by the tension in the cable
A flat slab of styrofoam, with a density of 32 kg/m^3, floats on a lake. What minimum volume must the slab have so that a 34kg boy can sit on the slab without it sinking
What is the moment of inertia of flywheel
How long after the car passes point A does the radio experience a minimum in the net signal? suppose that the wavelength has the value found in part.
Jim paddles a canoe across a river that is 20 meters wide in 2.0 minutes. Uopon reaching the other side, he realizes that the river carried him 12 meters east of his starting point. If the water flowed towards the east with consant velocity and his c..
Using the Bohr model what is the radius of the electron orbit in the Hydrogen atom when the electron is in the n = 12 state? What is the energy of the Hydrogen atom when the electron is in the n = 3 state?
The scale of a spring balance reading from 0 to 230 N has a length of 15.0cm. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.40 Hz. What is the mass of the fish ignoring the mass of the spring.
A child looks at his reflection in a spherical Christmas tree ornament 8cm in diameter, and sees his image reduced by half. How long is his face from the ornament.
A closed box is filled with dry ice at a temperature of -88.7 oC, while the outside temperature is 23.3 oC. Find the thermal conductivity of the material from which the box is made
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