Master Physics with Fun Quizzes & Brain Teasers!

. The force of gravity on the Moon is said to be one-sixth of that on the Earth. What would a mass of 12 kg weigh; (a) on the Earth
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A current of 10 A flows through a conductor for 2 minutes calculate the amount of charge passed away any area of cross section of conductor if any charge of an electron is 1.6*10-19 then calculate total no of electrons flowing
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which of the following objects is most likely to have a mass-to-light ratio of 10? question 50 options: small group of galaxies matter around the sun the sun the milky way dense cluster of galaxies
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the magnetic field inside a 5.0-cm -diameter solenoid is 2.0 t and decreasing at 3.40 t/s . part a what is the electric field strength inside the solenoid at a point on the axis? express your answer with the appropriate units. activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value type e
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0.3 points question at position 3 which of the graphs to the left correspond to each of the two initial waves you were given? you may find it helpful to plot these graphs on your own. if you do it by hand, you will gain even more insight.
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for the galvanic (voltaic) cell cd(aq) fe(s) cd(s) fe(aq) (e = 0.0400 v), what is the ratio [fe]/[cd] when e = 0.010 v? assume t is 298 k
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what pressure does sun light exert on the earth? s = 1,340 w/m2 outside the atmosphere of the earth and the radius of the earth is 6,378 km. and on you if your effective area is approximately 1.4 m2?
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a girl running at 6.72m/s has a momentum of 281kgm/s. what is her mass
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A coil has 500 turns and self-inductance 7.50 mH.The current in the coil varies with time according toi=(680mA)cos[t/(0.0250s)].Part AWhat is the maximum emf induced in the coil? (with units)Part BWhat is the maximum average flux through each turn of the coil? (in Wb )
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if a stepper motor has a step angle of 7.5, what digital input rate is required to produce a rotation of 10 rev>s?
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find the magnetic field 6.31 cmcm from a long, straight wire that carries a current of 5.86 aa .
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a 0.309-kg mass is attached to a spring with a force constant of 55.0 n/m.if the mass is displaced 0.270 m from equilibrium and released, what is its speed when it is 0.127 m from equilibrium?
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for a particular reaction, =144.6 kj/mol and =301.2 j/(molk). calculate for this reaction at 298 k.
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find the time the trip would take if you could somehow travel there at jet-plane speed, 2800 km/h . (note: 1 light-year equals 9.461012km .)
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calculate p for the following values: v=100cos(t 50)v , i=25cos(t 15)a .
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if we observe a star's spectrum and find that the peak power occurs at the border between red and infrared light, what is the approximate surface temperature of the star?
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a small airplane has a total mass of 1800 kg and a wing area of 42 m2 . determine the lift and drag coefficients of this airplane while cruising at an altitude of 4000 m at a constant speed of 280 km/h and generating 190 kw of power
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Suppose that you have an electron moving with speed comparable to the speed of light in a circular orbit of radius r in a large region of uniform magnetic field B. (a) What must be therelativistic momentum p of the electron? (b) Now the uniformmagnetic field begins to increase with time: B = Bo + br, where Bo and b are positive constants. In one orbit, how much does the energy of the electron increase, assuming that in one orbitthe radius doesn't change very much?
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if you start to cool an fec alloy, starting at 600c, approximately what cooling rate would you need to ensure you maintain 100 ustinite?
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which change is a physical change? iron rusting the burning of lamp oil dry ice subliming dynamite exploding
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A 40 dB sound wave strikes an eardrum whose area is 5.0105m2. At this rate, how long would it take your eardrum to receive a total energy of 1.0 J?
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a car has acceleration given by a(t) = 8e0.2tm/s2 and initial velocity 15 m/s. (a) how much time does it take the car to stop? (b) how far does the car travel in this time?
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A toroidal solenoid has 600 turns, cross-sectional area 6.60 cm2 , and mean radius 5.00 cma)Calcualte the coil's self-inductance.b)If the current decreases uniformly from 5.00 A to 2.00 A in 3.00 ms, calculate the self-induced emf in the coil.c)The current is directed from terminal a of the coil to terminal b. Is the direction of the induced emf from a to b or from b to a?
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When the ends of two bar magnets are near each other, they attract one another. The ends must be...a. one north, the other southb. both northc. both southd. either b or c
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