Master Physics with Fun Quizzes & Brain Teasers!

A swimmer resting on a raft notices 12 wave crests pass him in 18s. The distance between one crest and the next crest is 2.6 m. What is the speed of sound if the temperature of the air where the simmer rests is 23 degrees Celsius?
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in a game of billars the cue ball strikes the 8-ball and immediately comes to rest. what happnes to the cue ball's momentum?
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what is the mass of 5l of fresh water (density = 1.00 g/cm3)?
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if the distance between the balloon and the pith ball doubles, what will happen to the static-electric force? explain your answer.
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true/false.properly conducting electricity so that its signal can travel unimpeded from one node on a network to another.
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A heavy rope, 60 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 130 ft high. (Let x be the distance in feet below the top of the building. Enter xi* as xi.)a) How much work W is done in pulling the rope to the top of the building?-Show how to approximate the required work by a Riemann sum.-Express the work as an integral.-Evaluate the intergral
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Two segments of wire have equal diameters but different conductivities. Current / passes through this wire. if the conductivities have the ratio -2, what is the ration of 2 of the electric field strengths in the two segments of the wire?
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A flight attendant pulls her 66 N flight bag a distance of 318 m along a level airport floor at a constant velocity. The force she exerts is 43 N at an angle of 52 above the horizontal.(a) Find the work she does on the flight bag.(b) Find the work done by the force of friction on the flight bag.(c) Find the coefficient of kinetic friction between the flight bag and the floor.
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an object 0.760 cm tall is placed 17.5 cm to the left of the vertex of a concave spherical mirror having a radius of curvature of 20.5 cm . part a calculate the position of the image.
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a series-wound dc electric motor will normally require
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If interstellar dust makes an RR Lyrae variable star look 1 magnitude fainter than it should, by how much will you overestimate its distance? (Hint: Use the magnitude-distance formula.)
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If we need a 1 second exposure with a f/8 lens, how long do we need to capture the same amount of light with an f/4 lens?a. 4 sb. 1/4 sc. 2 sd. 1/2 s
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Part 1 Suppose you inflate your car tires to 32 psi on a 22 C day. Part A Later, the temperature drops to 0C. What is the pressure in your tires now?
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ment you illuminate a metal with light of an unknown wavelength and measure the maximum kinetic energy of the photoelectrons to be 0.65 eV. Then you illuminate the same metal with light of a wavelength known to be 2/3 of the first wavelength and measure a maximum kinetic energy of 2.3 eV for the photoelectrons.(a) Find the first wavelength, in nanometers.(b) Find the metal's work function, in electron volts.
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what is the potential difference between yi =8cm and yf =8cm in the uniform electric field e =(20,000i^50,000j^)v/m?
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a tanker discharges a jet of water horizontally backwards with a velocity of 4.8 m/s. if the rate of discharge is 0.085 m3/s, what is the force required to keep the tanker at rest?
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what force magnitude does the scale read when the elevator slows to a stop with an acceleration of magnitude 2.6 m/s2 ?
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what is the pressure of water vapor (m = 0.018 kg/mol) at a temperature of 600 k and density of 1.5 kg/m3?
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A length of wire is cut into 7 equal pieces. The 7 pieces are then connected parallel, with the resulting resistance being 1 . What was the resistance r of the original length of wire? Answer in units of . q30
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output variables are closely related to one another wy do you think that nam model predicts higher temperatures than the gfs model in the first nine hours after the forecast is issued?
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a tanker discharges a jet of water horizontally backwards with a velocity of 4,8 m/s. if the rate of discharge is 85 dm3/s, what force is required to keep the tanker at rest?
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Determine: The speed of a 6.6 MeV proton. The speed of a 12 MeV helium atom. The specific type of particle that has 1.14 keV of kinetic energy when moving with a speed of 2.010^7m/s.
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which labels belong in the areas marked x, y, and z? x: always attractive y: very small range z: attractive and repulsive x: attractive and repulsive y: very small range z: always attractive x: very small range y: attractive or repulsive z: infinite range x: infinite range y: attractive or repulsive z: very small range
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In discussing molecular rotation, the quantum number J is used rather than l. The bond length is 141.4pm. Part B: Calculate Erot/kBT for 1H81Br for J =5 at 382 K . Part C: Calculate Erot/kBT for 1H81Br for J =10 at 382 K . Part D: Calculate Erot/kBT for 1H81Br for J =20 at 382 K .
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