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A boat takes 4h to travel down a 30km river, then 6.0h to return. How fast is the river flowing?
Assume that a light bulb is a 60.0 W bulb with a resistance of240 Ω. The magnetic field has a magnitude of 0.40 T, and the length of the rod is 0.60 m. The only resistance in the circuit is that due to the bulb.
What is the wavelength of sound if it has a wavespeed of 1.36 m/s and a frequency that is 6.69 Hz? (The unit of measure for the wavelength is a meter, which is written m.)
What is the pressure change in water going from a 3.0- cm-diameter pipe to a 2.1- cm-diameter pipe if the velocity in the smaller pipe is 6.5 m/s?
Suppose now that the apparatus is sealed, and the temperature rises to 40.0o C. Find the pressure inside the apparatus now
A sound wave traveling at 341 m/s is emittedby foghorn of a tugboat. An echo is heard2.40 s later.How far away is the reflecting object? reply in units of m.
A battery supplies 0.77 A to three resistors connected in parallel. What is the exact current (in A) through the third resistor
An ac generator with a frequency of 1.14kHz and an rms voltage of 20.2V is connected in series with a 1.80killo ohm resistor and a 320mH inductor. What is the average power consumed by this circuit
An object, of mass m = 3 kg, is released from a height h = 5 m of the top of a rough 45 incline, Determine the maximum height on the left incline that the object will reach before sliding back again to the right
A baseball (mass 0.14 kg, radius 3.7 cm) is spinning with an angular velocity of 45 rad/s. If the baseball has a linear speed of 38 m/s, what is the ratio of its rotational and translational kinetic energies?
A tennis ball (m=0.2 kilogram) is thrown a brick wall. It is traveling horizontally at 16 m/s just before hitting the wall and rebounds from the wall at 8 m/s, still traveling horizontally. Obtain the magnitude of the average force of wall on ball
You leave a 80W light bulb on for 8 hours in the day. How much energy has been used in joules
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. what is the intensity of the light wave
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