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during normal operation a computers hard disk spins at 7200 rpm if it takes the hard disk 440 s to reach this angular
the hubble space telescope orbits earth 601 km above earths surface what is the period of the telescopes
a diverging thin lens and a concave mirror have focal lengths of equal magnitude a object is placed 32f from the
an apparatus shown in the the figure below is designed to study insects at an acceleration of magnitude 958 ms 978g
a 1300 kg car takes a 52 m radius unbanked curve at 15 ms what is the size of the friction force on the
air molecules in a warm room 27degc 300 k typically have speeds of about 500 ms 1100 mph why is it that we are
a billiard ball will stop short when it collides head-on with a ball at rest the ball cannot stop short however if
in a head-on collision a car stops in 027s from a speed of 24ms the driver has a mass of 61kg and is fortunately
a 150-kg block of ice at 0 degc melts to liquid water at 0 degc inside a large room that has a temperature of 200degc
an object at rest on a flat horizontal surface explodes into two fragments one seven times as massive as the other the
a an ideal gas occupies a volume of 22-cm3 at 20degc and atmospheric pressure determine the number of molecules of gas
gas is confined in a tank at a pressure of 129 atm and a temperature of 283degc if two thirds of the gas is withdrawn
a 20cm length of 026mm diameter nichrome wire is welded into a circular loop the loop is placed between the poles of
two strings equal in length and made of the same material are subjected to tensions in the proportion of 1 to 4 the
a 99 cm long spring k 900 nm is compressed by 24 cm what is the potential energy due to the spring in
a cart with mass 310 g moving on a frictionless linear air track at an initial speed of 14 ms undergoes an elastic
a conductor in the shapr of a sperical shell of radii 8 and 11 cm is charged to 20 uca find the electric field at the
the only two forces acting on a body have magnitudes f1 and f2 and directions that differ by an angle in radians if
for the house in question 3 calculate the infiltration heat losses in btuh when t 40degf assume two air changes per
a car goes around a curve on a road that is banked at an angle of 315 degrees even though the road is slick the car
a conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a
two blocks attached by a string see figure slide down a 15deg incline block 1 has mass m1 091 kg and block 2 has mass
a thin flexible rod of length l10 cm carries charge q91 nc uniformly along its length the rod is then bent into a
a 50 gram ball enters a a pendulum with mass 200 g the pair then swings up to a height of 12 cmfind the velocity at
a rectangular pipe carries water over a horizontal distance of 10m water enters the pipe through an area of height 19cm