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An electron is in a vacuum near earth's surface and located at y =0 on a vertical y axis. At what value of y should a second electronbe placed such that its electrostatic force on the first electron balances the gravitational force on the first electron?
The temperatures indoors and outdoors are 297 and 311 K, respectively. How much heat is removed from the house
A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 4.00 s. find the ratio of the man's running speed to the sidewalk's speed
What would be the electric current intercepted by the total surface area of the planet?
A coil with 25 turns of a square shape of 1.80 cm on each side. Find the magnitude and direction of the induced current in the coil
You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 670 N and that of your belongings is 1030 N. Determine the work done by the elevator in lifting you
A 71 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A is 7.0m/s , what is the normal force exerted by the snow on the skier at point B? Ignore fricti..
How much is the spring compressed?
Two pieces of steel wire with identical cross sections have lengths of L and 2L. what is the frequency of the third harmonic in the longer wire
Through a hard sneeze, your eyes might shut for 0.70s. If you are driving a car at 100 km/h during such a sneeze, how far does the car move for the duration of that time.
A semi truck is stopped across a road. As a driver approaches at 20 m/s he sounds the horn of his car (f=350 Hz). find the frequency of the horn heard by the truck driver
As a function of time, the velocity of the football can be written as . (If the acceleration of an object is constant, its average acceleration is the same for all time periods.) Calculate the average acceleration vector of the football for the ti..
A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized. What is the total distance L between object and image
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