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A swimmer swims across the river and reaches the opposite shore directly across from where he started. He swims at 5.0 m/s relative to the water. The river is flowing at 4.0 m/s and is 100.0 m across. How long does it take the swimmer to reach the opposite shore.
When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will ta..
An inexperienced catcher catches a 130 km/h fastball of mass 140 g within 1 ms, What are the average forces imparted to the two gloved hands during the catches
A small 12.8g plastic ball is tied to a very light 26.9cm string that is attached to the vertical wall of a room. Find the magnitude and direction of the electric field in the room
A balloon rises at at constant velocity of 3m/s. A rock is released over the side. 4.5 seconds later this rock hits the ground. compute the height of the rock when it is halfway between the balloon and the ground. Assume Earth gravity (-9.81m/s), ..
A current of 17.0 mA passes through a circular cable of 2.0m of circumference. A magnetic field of 0.8T passes parallel to the plane of the "loop". calculate what is the magnetic moment of the loop
an arrangement in which four disks are suspended by cords. The longer, top cord loops over a frictionless pulley, What are the masses of each disk
Purley decelerated from 173 km/h to zero in a distance of only about 0.66m. Calculate the magnitude of the acceleration experienced by Purley
A bug crawls outward from the center of a compact disc spinning at 160 revolutions per minute. The coefficient of static friction between bug's sticky feet and disc surface is 1.10.How far does the bug get from the center before slipping.
Consider a particle of radius s that orbits a solar mass star at 1 au on a circular orbit.Calculate the mass of gas that the particle collides with during one orbit about the star
One way to decrease your use of fossil fuels is to heat your water via solar radiation. A solar water heater runs cold water through dark, radiation absorbing tubing.
A current I flows down a wire of radius a. If it is uniformly distributed over the surface, what is the surface current density K
A 70-? electrical appliance and a 110-? electrical appliance are plugged into the outlets of a house. By what factor will the power used change if an additional 140-? electrical device is plugged in?
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