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a comet of mass 45 e22 kg moving at 10000 ms collides withthe earth initially at rest and stick the mass of the earth
a 5kg steel ball is dropped onto a copper plate from a heightof 10m if the ball leaves a dent 32mm deep what is the
which of the following reagents could be used to separate the two anions in a solution of sodium sulfide and sodium
a uniform drawbridge must be held at a 37 degree angle abovethe horizontal to allow ships to pass underneath the
1 in a capacitor one side accumulates charge because the battery is putting charges on it explain how the other plate
determine the total number of moles of solid sodium hydroxide required to react with 67800ml of 04500m phosphoric acid
1 they help position the reactant molecules to facilitate the reaction2 they make electron transfer proceed more
a uniform ladder 50 m long rests against a frictionlessvertical wall with its lower end 30 m from the wall the
a particle of charge 303 x 10-6 c is 102 cmdistant from a second particle of charge -185 x 10-6 ccalculate the
the double helix of dna is partially held together with hydrogen bonds between the complementary bases a with t and g
a lawn mower in the form of a thin-walled hollow cylinder withmass m is pulled horizontally with a constant horizontal
a boat moves through the water of a river at 100 ms relative to the water regardless of the boats direction if the
a simple harmonic oscillator takes 200 s to undergo sixcomplete vibrationsa find the period of its motionsb find the
a second-order reaction required 538s for the concentration to drop from 050 m to 036 m what is the value of the rate
a cylinder with a ovable piston contains gas at a temp of 27degree c a whole volume of 150 m cubed and an absolute
a transverse sinusoidal wave on a string has a period t 280 ms and travels in the negativex direction with a speed of
a block of unknown mass is attached to a spring of force constant500 nm and undergoes simple harmonicmotion and an
two scales on a voltmeter measure voltages up to 210 and 309 vrespectively the resistance connected in series with
about 01ev is required tonbsp break a hydrogen bond in a protein molecule what is the minimum frequecy that the
the escape speed from a distant planet is 40 kms if theacceleration of gravity on the planet surface is 125ms2 what is
an electric heater is used to heat a room of volume 62m3 air is brought into the room at 50 and its completely
which of the following would act as a nonelectrolyte when dissolved in water select all that applya nh4no3b naclc
a 65 kg person jumps from awindow to a fire net 23 m below whichstretches the net 15 m assume thatthe net behaves like
a rocket is fired at a speed of 750 ms from ground level at an angle of 648degabove the horizontal the rocket is fired
an experimenter wishes to arrange a two-slit experiment with 3 evelectrons so that the n1 maximum occurs at 15o what