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What must be the contact area between a suction cup (completely exhausted) and a ceiling if the cup is to support the weight of an 80.0-kg student?
One of our closest stellar neighbours, Vega, is 5.8 light years away. What is the intensity of its signal at Vega
A jet is flying horizontally, as the drawing shows. When the planeis directly overhead at B, a person on the ground hearsthe sound coming from A in the drawing. The averagetemperature of the air is 20 oC.
A railroad car with a mass of 2 x10^4 kg moving at 3.0 m/s collides and joins with 2 railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.20 m/s.
A 481-kg cannon fires a 18.3-kg projectile with a speed of 167 m/s with respect to the muzzle. what is the speed of the projectile with respect to the ground
An electron that has velocity v = (2.0 x 106 m/s)i +(3.0 x 106 m/s) j moves through the uniform magneticfield B = (0.30 T)i - (0.15 T)j. Find the force on the electron
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 1300 m. What is the speed of the spaceship in terms of the speed of light
a stone thrown horizontally from a height of 5.92 m hits the ground at a distance of 13.50 m. calculate the speed of
An eyepiece of 2.1- cm focal length and an objective of 0.34- cm focal length are used in a standard microscope. What power should be marked on the eyepiece
During the pitching motion, a baseball pitcher exerted an average horizontal force of 60 N against the 0.15 kg baseball while moving it through a horizontal displacement of 2.0 m before he released it
goldilocks is visiting the three bears house and she notices three bowls of porridge arranged on the table. papa bears
Wires are not really ideal. The voltage drop across a current-carrying wire can be important unless the resistance of the wire is quite low. Presume a 40ft extension cord is being used to provide power to an electric lawn mower. The cord carries a 11..
Points in the same direction as the electric force if the probe charge q is positive and the opposite direction of the electric force if the probe charge q is negative. Depends on the magnitude of the charge q utilized to probe the field.
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