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A cometary nucleus rotates rapidly and has an albedo A=0.05. When its surface temperature reaches T?150K, the ice of which it is mostly made starts to sublime, and forma a gaseous coma. How far is the cometary nucleus from the Sun when the coma starts to form?
The distance between the electron and proton in a hydrogen atom is 5.3 x10-11 m. Find the speed of the electron as it orbits the proton
The planet Uranus has a radius of 25560km and a surface acceleration due to gravity of 11.1m/s^2 at its poles. Calculate the mass of Uranus from the above data
A child throws a snowball over a wall. The horizontal distance which the snowball travels is 3.83 m. Determine the initial speed of the snowball
A large wooden turntable in the shape of a flat disk has a radius of 1.90m and a total mass of 150kg. Find the angular speed of the turntable after the parachutist lands
The conductive bar is moving with a constant speed v = 6.4 m/s, the magnetic field B = 0.75T, the length of bar inside of B field l = 50cm, How much is the power of the bulb
How fast must the car be travelling just as it leaves the cliff in order to clear the river and land safely on the opposite side.
What is the ratio of the cardinals magnitude. One mole of tungsten (6 1023 atoms) has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter. You have a long thin bar of tungsten, 2.3 m long, with a square cross section, 0.15 cm on..
A 14.9 cm long tendon was found to stretch 3.50 mm by a force of 15.0 N. The tendon was approximately round with an average diameter of 8.22 mm. Calculate the Young's modulus of this tendon
A spring has a spring constant k = 0.84 N/m. If it is stretched 0.13 m from its equilibrium position, what is the restoring force of the spring
A planet's moon travels in an approximately circular orbit of radius 5.4 107 m with a period of 7 h 21 min. Calculate the mass of the planet from this information
q1. sunlight shining in during the daytime is absorbed by the floor interior walls and objects in the room raising
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
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