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a backpack full of books weighing 52n rests on a table in a physics classroom a spring with a force constant of 150nm
a long straight wire carries a current of 40 a in a region where a uniform external magnetic field has a 30-microt
the pressure of a helium gas cylinder is 297 atm after several balloons have been blown up the pressure is decreased
an electron initially at rest recoils after a head-on collision with a 594-kev photon determine the kinetic energy
a solid sphere of mass m and radius r spins about a horizontal axis with a period t it is hung by a thread attached to
the first bright fringe of a diffraction grating of 600 rulingmm is found at angle of 21 degreesfind the wavelength
in 1971 apollo 14 astronaut alan shepard hit two golf balls while on the moon the first one rolled 40 yards into a
when a concave mirror is placed facing the sun the suns rays converge to a point 10cm from the mirror now an erect
a 20 wood block is launched up a wooden ramp that is inclined at a 31 angle the blocks initial speed is 60 ms the
a persons body is covered with 18 m2 of wool clothing the thickness of the wool is 230 10-3 m the temperature at the
air molecules in a warm room 27degc 300 k typically have speeds of about 500 ms 1100 mph why is it that we are
a 162 g bullet with an initial speed of 870 ms embedded itself in a 400 kg block which is attached to a horizontal
discuss in detail why it might be dangerous to microwave raw eggs with their shell intact using the concepts learnt
a mixture of iron and an unknown material is bombarded with electrons the wavelength of the rmkalpha lines are 194 rm
a strong weightless rope has a mass m hanging from the middle of it as shown the tension force on each rope is 25 n
a solenoid is to have an inductance of 0257 mh a cross-sectional area of 556 10-4 m2 and a length of 396 cma how many
in a particle accelerator a proton reaches an acceleration of 90 times 1013 ms2 the mass of a proton is 17 times 10
the density of ice is 917 kgm3 and the density of sea water is 1025 kgm3 a swimming polar bear climbs onto a piece of
a 720gg 50-cm-long metal rod is free to rotate about a frictionless axle at one end while at rest the rod is given a
block 1 with mass m1 and speed 21 ms slides along an x axis on a frictionless floor and then undergoes a
a cylindrical spacecraft with length l 132m and mass m 11110kg is at rest in a particular reference frame a piece of
the turntable of a record player has an angular speed of 97 rads at the instant it is switched off 40 s later the
in a certain solar house energy from the sun is stored in barrels filled with water in a particular winter stretch of
a beaker with a capacity of exactly 100ml contains 997ml of ethanol at 26degrees c part a if its temperature rises at
a 300kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 00400m the spring