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the average density of a fish can be found by first weighingit in air and then finding the apparent weight of the fish
a 20 g block of aluminum is at 370 degrees c after 1130calories have been transferred to it what was the original
an isolated container holding 30 g of hydrogen gas is at 25degrees c if 1000 calories were transferred to the gas what
gamma rays gamma rays are high-energy photons in acertain nuclear reaction a gamma ray of energy 511 mev
a an ideal gas occupies a volumeof 20 cm3 at 20degc andatmospheric pressure determine the number of molecules of gas
an object is 12cm to the left of a lens with f20cm a secondlens with f4cms is 2cms to the right of the first lens find
a a microscpe objective with a 5 mm focal length is used toproject the image of an illuminated object 01mm high onto a
a board lies on top of two uniform cylinders with i mr22 which lie on a fixed plane inclined at angletheta the board
a 170 kgbucket of water is suspended by a rope wrapped around a windlassthat is a solid cylinder 0500 m indiameter with
if a boat floats in two types of liquid one more desnse than theother where is the buoyant force greater on the
a 500kg pig is standing at the top of a muddy hill on a rainy day the hill is 1000m long with a vertical drop of 300 m
kathy is changing the tire of her car on a steep hill 200 m highshe trips and drops the 100-kg spare tire which rolls
blackie a cat whose mass is 545 kg is napping on top of therefrigerator when he rolls over and falls blackie has a ke
the suns mass is 2 x 1030 kg and theaverage radius of jupiters orbit is 78 x 1011 m find the orbital velocity of
an earth satellite revolves in a circular orbit at a height of525 km above the earths surfacea what is the speed of the
two large parallel conducting plates are 17 cm apart and have charges of equal magnitudeand opposite sign on their
perhaps to confuse a predator some tropical beetles arecolored by optical interference that is due to scales
abody weight w is attached by a string of length l to a hook on a vertical wallnbsp a horizontal force f acting on the
three charges are fixed to an x y coordinate system a chargeof 4muc is on the y axis at y2meters a charge of -8mucis at
a square of side a has a chargenbsp q at each cornerwhat is the electric potential energy of this system of
in proton-beam therapy a high-energy beam of protonsis fired at a tumor the protons come to rest in the tumordepositing
a 60kg person walks on a 100kg log at therate of 080ms with respect to he log with what speed does the log move with
a 260 g block is dropped onto arelaxed vertical spring that has a spring constant of k 25 ncm the block becomes
katie a 300-kg child climbs a tree a to rescue her cat who isafraid to jump 80m to the ground how much work does katie
a bat can detect small objects such as an insect whose sizeis approximately equal to one wavelength of the sound the