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a person pulls a 5 kg sled by a rope across nearly frictionless ice the rope and therefore the force is oriented 40
two canoes are tied together and traveling down a river with the current spotting a waterfall the two canoeists cut the
a person having a mass of 591 kg stands before a flight of 30 stairs each of which is 25 cm high he runs 20 stairs
youre an optometrist mounting a projector at the back of your 42-m-long exam room 26m above the floor it shines an
a transverse sinusoidal wave on a string has a period t 360 ms and travels in the negative x direction with a speed of
light of wavelength 530 nm is incident normally on a diffraction grating two adjacent maxima occur at angles given by
a laser produces a cylindrical beam of light of wavelength 400nm the average energy in a 2m length of the beam is
a cube of ice is taken from the freezer at -8oc and placed in a 110 g aluminum calorimeter filled with 300 g of water
an archers bow is drawn at its midpoint until the tension in the string is 107 times the force exerted by the archer
a hollow sphere of inner radius 74 cm and outer radius 84 cm floats half-submerged in a liquid of density 800 kgm3 what
in the macroscopic world you know that you can hear but cannot see around corners under what conditions does light bend
if one shines a laser with wavelength 650 nm through a single slit of width a 004 mm draw the diffraction pattern
the largest and smallest slits in these experiments are 016mm and 004mm wide respectively the wavelength of the laser
a microwave oven operates at 24 ghz with an intensity inside the oven of 2350 wm2 what is the amplitude of the
an object is placed to the left of a lens and a real image is formed to the right of the lens the image is inverted
1 what is the density of neon gas at standard temperature and pressure the atomic mass of neon is 2018 atomic mass
a block of mass m 260 kg is pushed a distance d 290 m along a frictionless horizontal table by a constant applied
a 640-kg runner has a speed of 550 ms at one instant during a long-distance eventif he doubles his speed to reach the
a 640-kg runner has a speed of 550 ms at one instant during a long-distance eventwhat is the runners kinetic energy at
a sledge loaded with bricks has a total mass of 186 kg and is pulled at constant speed by a rope inclined at 196deg
for a science experiment you need to electroplate a 120nm-thick zinc coating onto both sides of a very thin 25cm x 25cm
an electron confined in a one-dimensional box emits a 400nm photon in a quantum jump from n1 to n2what is the length l
a simple magnifying glass can focus sunlight enough to heat up paper or dry grass and start a fire a magnifying glass
in a hydraulic lift the maximum gauge pressure is 185 atm if the diameter of the output line is 187 cm what is the
a water pipe narrows from a radius of r1 433 cm to a radius of r2 339 cm if the speed of the water in the wider part