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the closest star to our solar system is alpha centauri which is430 light years away a spaceship with a constant speed
a spaceship takes a nonstop journey to a planet and returns in 10hours according to a clock on the spaceship if the
how fast should a moving clock travel if it is to be observed by astationary observer as running at one-half its normal
an observer on earth sees an alien vessel approach at a speed of 6c a second spaceship comes to the rescue overtaking
a parallel-plate capacitor has a capacitance of 100pf a plate areaof 135cm2 and a mica dielectric kappa 54 completely
electricity may be generated by rotating a loop of wire between the poles of a magnet the induced current is greatest
a basketball of mass 0611 kg is droppedfrom rest from a height of 117 m it rebounds to a height of 0638m a how much
a uniform bridge 200 m long and weighing 400 x 105 n is supported by two pillars located 300 m from each end if a 196
a 1 kg meterstick is supported at its 4m mark by a stringattached to the ceiling a 7 kg mass hangs vertically from
how did marie and pierrecurie measure the radio activity of her pitchblende samples how did she deduce that there must
an athlete on a trampoline leaps straight up into the air with an initial speed of 90 ms find the speed of the athlete
a parallel-plate capacitor has a voltage v 60 v between its plates each plate carries a surface charge density sigma
two equal charges q are separated by a distance dnbsp one of the charges is released and moves away from the other due
a glass is half-full of water with a layer of vegetable oiln 147 floating on top a ray of light travelingdownward
a molecule of dna deoxyribonucleic acid is 230 microm long the ends of the moleculebecome singly ionized -- negative on
a disk is initially at rest undergoes constant angular acceleration after accelerating for 31 s te disk hasturned to an
four identical charges 29 muc each are brought from infinity and fixed to a straight line each charge is 033 m from the
a river flows due south with a speed of 20ms a man steers aboat across the river his velocity relative to the water is
a typical lightbulb in your house is rated 75 w which means that the bulb dissipates 75 wwhen connected to a dc voltage
a lamp r 147 anelectric heater r 26and a fan r 48 areconnected in parallel across a 115 vlinea what total current
a revolutionary war cannon with a mass of 2270 kg fires a 165 kgball horizontally the cannonball has a speed of 137 ms
how much does the internal energy in joules of a block of metal changenbsp a when 30 cal of heat is added to it and b
a 30 kg block is traveling in the -x direction at 50 ms and a10 kg block is traveling in the x direction at 30 msa find
a sled and rider with a combined weight of 63 kg are at reston the top of a hill 11 m higha what is their total ebergy