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What's a new law of gravitation to replace F = GMm/r^2 at distances larger than some r-not, so that flat rotation curves occur without the need for dark matter? Any help with this would be greatly appreciated!
two rooms, one at 30 degree Celsius and the other at 10 degrees Celsius, Calculate the total power output of lit light bulbs required in the warmer room
A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm. (a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if negative)
Four equal positive point charges, each of charge 5.7?C , are at the corners of a square of side 9.2 cm. What charge should be placed at the center of the square
A small electric car overcomes a 250 N friction force when traveling 30 km/h. How much power is dissipated in the coils
When viewed by an observer on the Earth, light from a distant galaxy is Doppler shifted to the red such that the ratio of the unshifted frequency to the observed frequency is 1.8
A lens placed at the origin with its axis pointing all along the x axis produces a real inverted image at x=-24cm that is twice as tall as the object. What is an image distance.
Communication satellites are geosynchronous, meaning that they have a rotational period equal to one day. what is the altitude of a geosynchronous satellite above the Earth's surface in kilometers
A block of mass m = 2.0 kg is dropped from height h = 90 cm onto a spring of spring constant k = 1960 N/m. Find the maximum distance the spring is compressed
ferromagnetism is caused by:
What is the magnitude of the magnetic forces on each of three sides?
A small flywheel starts from rest and spins up to speed in 10 seconds. During this time it completes a total of 300 revolutions. what is the angular acceleration of the wheel
The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.19 is suspended within a large evacuated enclosure whose walls are at a temperature of 285.0 . What power input is needed to maintain the sphere at a temperature of 2500.0 i..
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