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a swimmer who is able to swim a speed of 14ms in still water starts to swim southward directly across a 28km wide river
a rocket-powered hockey puck has a thrust of 150n and a total mass of 140kg it is released from rest on a frictionless
a 180 kg rubber ball is dropped from a height of 350 m and bounces off the floor if the ball does not lose any energy
how much work is done by pressure in forcing 66 m3 of water through a 130 mm internal diameter pipe if the difference
an air conditioner connected to a 150 v rms ac line is equivalent to a 98 resistance and a 197 inductive reactance in
the string in a yo-yo is wound around an axle of radius 0547 cm the yo-yo has both rotational and translational motion
an airtight box having a lid with an area of 139 in2 8968 cm2 is partially evacuated if a force of 1050 lb 46706 n
a river 240 m wide and 50 m deep drains a 30000 km2 land area in which the average precipitation is 48 cmyear
in a rotor-ride at a carnival people rotate in a vertical cylindrically walled room pt a if the room radius was 52 and
a riffle with mass 300kg fires a bullet with mass 350x10-3kg at a speed of 330 ms what is the recoil speed of the
two nichrome wires the following questions refer to the circuit shown in the figure consisting of two flashlight
the area enclosed by the wire loop in the figure below is reduced from 31 cm2 to 13 cm2 in a time interval of 013 s the
a lens for a 35-mm camera has a focal length given by f 67 mma how close to the film should the lens be placed to form
an iron casting containing a number of cavities weighs 65000 n in air and 35000 n in water note the density of iron is
a 000893-kg bullet is fired straight up at a falling wooden block that has a mass of 180 kg the bullet has a speed of
an object made of a single atomic element weighs 20000 n in air and 18965 n when completely submerged in water
under normal conditions humans radiate electromagnetic radiation of frequency 333 x 1013 hz what is the wavelength
a 23-kg cart is rolling along a frictionless horizontal track towards a 16-kg cart that is held initially at rest the
at any given time the magnitude of the magnetic field in a beam of sunlight is 17 x 10-6 t what is the magnitude of the
a syringe has an area of 07 cm2 at its barrel and then narrows down to an area of 014 mm2 at the needle end if a force
two automobiles are equipped with the same single-frequency horn when one is at rest and the other is moving toward the
suppose that the coefficient of kinetic friction between zaks feet and the floor while wearing socks is 0250 knowing
a gas bottle contains a mixture of helium and oxygen molecules o2 is diatomic the root mean square speed vrms for the
a 200-o resister a 400-mh inductor and a 200-uf capacitor are connected in series with a 12--v rms source at 1000 hza
a solid iron sphere and a solid lead sphere of the same size are each suspended by strings and are submerged in a tank