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two lamps marked 60-watts 120 volts and 40-watts 120 volts are connected in series across a 120-volt line what is the
one-eighth of a sample of th remains undercayed after 54 days what is the half-life of this thorium
a generator driven by a diesel engine that develops 12 hp delivers 28 a at 240 v what is the efficiency of the
a charge of 2 x 10-7 c is 10 cm from a charge of -6 x 10-6 c find the magnitude and direction of the force on each
an x-ray photon with a wavelength of 069 nm scatters off an electron at 123 degrees what is the wavelength of the
the brakes of a car are applied to give it an acceleration of -3 ms2 the car comes to a stop in 5 s what was its speed
water flows at 0990 ms from a hot water heater through a 450-kpa pressure regulator the pressure in the pipe supplying
1- a 546 g sample of a conducting material is all that is available the resistivity of the material is measured to be
a wheel turns with a constant angular acceleration of 0640 rads2a how much time does it take to reach an angular
a certain molecule has a dissociation energy of 469 ev what is the minimum frequency photon that can dissociate it in
two identical pucks are on an air table puck a has an initial velocity of 20 ms in the x-direction puck b is at rest
after a satellite is blown apart the first part has speed v1 063c and the second one has a speed v2 091c if the mass
an object carries a charge of -80 microc while another carries a charge of -20 microc how many electrons must be
a 200 cm long organ pipe is filled with air and is open at one end and closed at the other the velocity of sound in air
aluminum is a very light metal with density of 27 gcm3 what is the weight in pounds of a solid sphere of aluminum of
an inexperienced catcher catches a 130 kmh fastball of mass 140 g within 1 ms whereas an experienced catcher slightly
a 58-kg astronaut is in space far from any objects that would exert a significant gravitational force on him he would
a boy of mass 600 kg is rescued from a hotel fire by leaping into a firefighters net the window from which he leapt was
for a safe re-entry into the earths atmosphere the pilots of a space capsule must reduce their speed from 26 times 104
a projectile is launched from 15 m above the ground at some angle theta it travels 42 m in the x direction where it
some kids playing at the park get creative and they turn a seesaw into a trebuchet - they slide the plank until only 20
a car is traveling at 10 ms how fast would the car need to go to double its kinetic energy by what factor does the cars
a 560 g sample of a conducting material is all that is available the resistivity of the material is measured to be
a cylindrical aluminum pipe of length 133 m has an inner radius of 190 10-3 m and an outer radius of 300 10-3 m the
a van de graaff generator has a spherical dome of radius 20 cm operating in dry air where atmospheric breakdown is at