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What is the difference between a gibbous moon and a crescent moon? The Moon changes phase every how many days? What is the difference between an umbra and a penumbra?
A spherical rain drop carries a charge of 2.70E-8 C and has a potential of 5.76E+4 V at the surface, Find the surface area of the drop
A runner with a weight of 686.7 N accelerates at a constant rate from 0 to 4.5 m/s in the first 2 seconds of a 100 m sprint. What is the net horizontal force
An 88.55 kg person is half way up a uniform ladder of length 3.135 m and mass 20.17 kg that is leaning against a wall. The angle between the ladder and the wall is ?. The coefficient of static friction between the ladder and the floor is 0.2561. Assu..
A 0.14-kg pinecone falls 16m to the ground, where it landswith a speed of 13m/s. (a) With what speed would the pinecone have landed if there had been no air resistance? (b) Did air resistance do positive work, negative work, or zero work on the pi..
Tension is maintained in a string by attaching one end to a wall and by hanging a 2.06 kg object from the other end of the string after it passes over a pulley that is 2.12 m from the wall. What is the fundamental frequency of the string
A 4.0-m-long steel wire has a cross-sectional area of 0.050cm^{2}. Its proportional limit has a value of 0.0016 times its Young's modulus. What is the maximum weight that the wire can support
A satellite is put in a circular orbit about Earth with a radius equal to 45% of the radius of the Moon's orbit. What is its period of revolution in lunar months
Define the carrier power, total power and sideband power in the AM signal.
An insect of height 2 cm is in front of a spherical mirror whose focal length has the absolute value | f | = 40 cm. The insect sees an image of itself that has a height of 0.40 cm and appears upright. Is the image real or virtual? Is it on the same..
In the sun, suppose the value of E (energy production per second per gram) drops to 1% of its central value at r/R = .02, which can be taken as the outer boundary of the solar core. Assume E==pT^4 where p is density and T is temperature. You have thi..
Find the maximum usable magnification for the 200 inch Hale telescope of the Mt. Palomar observatory
A piece of charcoal used for cooking is found at the remains of anancient campsite. Find the age of the charcoal
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