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a boy in a wheelchair total mass 450kg wins a race with a skateboarder he has speed 140 ms at thecrest of a slope 200 m
electron gun the electron gun in a traditionaltelevision tube fires electrons of kinetic energy 25 kev at thescreen in
particals mass of each 020kg are placed at the 40-cm and100cm marks of a meter stick of negligible mass this rigid body
a syringe with a 40-cm-long needle is filled with water at20circ rm c radius of thesyringe is 10 cm and the radius of
a particular radioactive source produces 150 mrad of 2 mev gamma raysper hour at a distance of 10 ma how long could a
two gas cylinders are identical one contains the monatomic gasargon ar and the other contains an equal mass of the
a uniform rod is 30m long the rod is pivoted about ahorizontal frictionless pin through one end the rod is releasedfrom
four identical particles mass of each 040kg are placed at the vertices of a rectangle 25m x 40m and held in those
a transverse wave is propogated in a string stretched along the x axis the equation of the wave in si units is given
a fireworks rocket is launched vertically into the night sky with an initial speed of 442 ms the rocket coasts after
two cubes having identical volumes are cemented together to form a composite material each cube is 260 cm on a side if
a ship carrying fresh water to a desert island in thecaribbean has a horizontal cross-sectional area of2710 m at the
early underwater exploration was conducted with a diving bell acylindrical diving bell 30 m in diameter and 40 m tall
a rechargeable battery that is completey drained of electrical energy can be completed charged by applying 2 ma of
the third order fringe of a 525 nm light is observed at an angle of 15 degrees when the light falls on two narrow slits
a component with a 19 omega resistor is rated for use at power levels not exceeding 11 w how much current can safely
accomplished silver workers in india can pound silver intoincredibly thin sheets as thin as 30010-7 m find the area of
a small block with mass 250kg is attacked to a string passing through a hole in a frictionless horizontal surface the
a small 100-g bug stands at one end of a thin uniform bar that is initially at rest on a smooth horizontal table the
if 470 j of heat are added to 65 moles of a monatomic gas at constant volume how much does the temperature of the gas
please calculate the concentration in molesm3 of oxygen in the air 21 oxygen assuming it acts as an ideal gas at 20
a projectile proton with a speed of 350 ms collides elastically with a targetproton initially at rest the two protons
two blocks are moving along a horizontalfrictionless surface the 4 kg block is moving to the right with aspeed of 6 ms
a ball of mass 180 g is released from rest at a height of150 m above the floor and it rebounds straight up to a
a river flows from south to north at 525 kmh on this river a boat is heading eastto west perpendicular to the current