Terminal velocity is the maximum speed that a body falling through air can reach due to air resistance. terminal velocity is given by the formula y =
. where m is
cpa'
the mass of the falling object, g is acceleration due to gravity ( = 9.81 moters per second ). c is a drag coefficient with 0.5& cs 1.0. p is the density of air ( 1.2
kg/m), and a is the cross-sectional area of the object. suppose that a raindrop falls from the sky. the mass of the raindrop is given by m =
d where r is its radius
and d = 1000 kg/m. the cross-sectional area of the raindrop is a= air
(a) substitute the formulas for the mass and area of a raindrop into the formula for the terminal speed and simplify the expression,

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Sound is a disturbance that travels through a medium as a