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A river flows with a uniform velocity v. A person in a motorboat travels 1.15km upstream, at which time she passes a log floating by. Always with the same throttle setting, the boater continues to travel upstream for another 50.6min and then returns downstream to her starting point, which she reaches just as the same log does. Calculate the velocity of the river.
A 12-V battery is connected in series with a switch, 6.0-ohms resistor and coil. What energy is stored in the coil when the current is 2.0 A
How much time elapses before the geologists hears the sound from the eruption? Discuss what we are assuming about the propagation of the wave. How much time does it take the seismic waves produced by the eruption to reach the geologist’s camp, ass..
A 19-kg chandelier is suspended from the ceiling by four vertical steel wires. Each wire has an unloaded length of 4 m and a diameter of 7 mm
A person starts from rest at the top of a large frictionless spherical surface, and slides into the water below. at what angle does the person leave the surface
A boat moves through the water of a river at 10-m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.6-m/s.
A 0.548-kg ball is attached to one end of an aluminum wire that has a diameter of 1.44 mm and an unstretched length of 0.651 m. Calculate the increase in its length due to the tension
What is the velocity of a beam of electrons that go undeflected when passing through perpendicular electric and magnetic fields of magnitude 8.8 x 10^3 V/m and 3.5 x 10^-3 T respectively
When you walk past an open door of a room in your house in which a person is speaking, you can hear the person long before you can see him. Why? What does this tell you about the wavelengths of light and sound?
Telegraph poles at the side of a railway track are spaced at intervals of 50 m. Calculate the acceleration of the train
To fit a contact lens to a patient's eye, a keratometer can be used to measure the curvature of the cornea-the front surface of the eye. Determine the radius of curvature of the cornea
An electron acquires 6.4 x 10^-16J of kinetic energy when it isaccelerated by an electric field from plate A to plate B. What is the potential difference between the plates?
A long solenoid with 12.8 turns/cm and a radius of 8.91 cm carries a current of 21.9 mA. What is the magnitude of the magnetic field there
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