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during a solar eclipse the earth moon and sun all lie on the same line with the moon between the sun and the earth the
suppose you are a medieval knight attacking a castle with a cannon the ball leaves the cannon with a speed of 443 ms
two railroad cars each of mass 6500 kg and traveling 98 kmh in opposite directions collide head-on and come to rest
a block with a mass of 15killogram is held stationary by a cord on a frictionless plane that is inclined at an angle
to tighten a spark plug it is recommended that a torque of 136 nbullm be applied if a mechanic tightens the spark plug
when a ceiling fan rotating with an angular speed of 350 rads is turned off a frictional torque of 0257 nbullm slows it
an unknown mass is hung from a very light spring with a spring constant of 19 nm neglect the mass of the spring if the
a 155 kg mass vibrates in simple harmonic motion with a frequency of 90 hz it has a maximum displacement from
the number of radioactive nuclei present at the start of an experiment is 420 1015 the number present 23 days later
dolphins emit clicks of sound for echolocation and communication a marine biologist is monitoring a dolphin swimming in
a disk of mass m1 and radius r1 is rotating about the center around a thin axle with an initial angular velocity of
a source of electromagnetic waves radiates power uniformly in every direction at a single frequency at a distance of
a helium-neon laser of the type frequently found in physics laboratories has a beam power of 700 mw at a wavelength of
a body of unknown mass is attached to an ideal spring with force constant 120 nm it is found to vibrate with a
the flywheel of a gasoline engine is needed to give up 500 joules of kinetic energy while its angular velocity
a ray of light strikes the a-b interface at 50o angle of incidence the index of refraction a is na120 the angles of
a circular saw blade 0200 m in diameter starts from rest in 600 second it accelerates with constant angular
when responding to sound the person eardrum vibrates about its equilibrium position assume an eardrum is vibrating with
a 100 kg mass hangs on a rope wrapped around a freely rotating 200 kg cylinder of radius 100 cm find the tension in
the coefficient of kinetic friction between the floor and a suitcase is 0272 if the suitcase has a mass of 715kg
the owner of a van installs a rear-window lens that has a focal length of -0295m when the owner looks out during the
a 2 kg cart has a spring with k 5000 nm attached to its front parallel to the ground this cart rolls at 4ms toward a
a grizzly bear is sitting on a rock in the middle of a calm river when she observes a fish directly below if the
a cyclist travelling at 50 ms uniformly accelerates up to 10 ms in 20s each tire of the bicycle has a radius of 35 cm
an aluminum rod and a copper rod of equal diameter are joined end to end in good thermal contact the temperature of the