Ultimate Physics Study Guide - Questions & Answers

an elastic cord vibrates with a frequency of 3.0 hz when a mass of 0.60 kg is hung from it. what is its frequency if only 0.38 kg hangs from it?
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an object is located in air 26 cm from the vertex of a concave surface made of glass with a radius of curvature 12cm. where does the image by refraction form? use nair
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a pipe of cross sectional area 1.2 m2 narrows to a pipe of cross-sectional area 0.4 m2. if the fluid is traveling at 1.7 m/s in the larger pipe, calculate the fluid speed in the narrower pipe.
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what is the magnitude and direction of the electric force on an electron in a uniform electric field of strength 1000 n/c that points directly west? (the charge on an electron is 1.6 x10-19 c)
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a baseball player takes a jump shot 14 m from the basket and releases the ball at the height of the basket. if the ball is launched at an angle of 51.0. what is the initial speed of the ball ?
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if an object is raised twice as high, its potential energy will be a. half as much b. twice as much. c. four times as much. d. impossible to determine unless the time is given. e. impossible to determine unless the mass is given.
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object a and object b are at equal distances on opposite sides of object c. object b has three times the mass of object c. objects a and b have equal mass. what is the ratio of the gravitational force between objects a and b to the gravitational force between objects b and c? (1 point)
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a bike rider approaches a hill at a speed of 8.5 m/s. the combined mass of the bike and the rider is 85.0 kg. choose a suitable system. find the initial kinetic energy of the system. the rider coasts up the hill. assuming there is no friction, at what height will the bike come to rest?
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a skydiver dives from an airplane. air resistance is measured each second following the skydivers jump.a. the skydriver has the slowest speed 2 secondsb.the skydriver has the slowest speed 4 seconds c.the skydriver has the slowest speed 1 seconds d.the skydriver has the slowest speed 3 seconds
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Use the information and table to answer the following question! A skydiver dives from an airplane. air resistance is measured each second following the skydivers jump.Time After Jump Weight Air Resistance(seconds) Newtons (N) Newtons (N)1 seconds 500N 200N2 seconds 500N 300N3 seconds 500N 400N4 seconds 500N 500NWhich statement BEST identifies the skydiver's speed at each second?a. The skydiver has the slowest speed at 2 secondsb. The skydiver has the fastest speed at 4 secondsc. The skydiver has the sloweat speed 1 secondd. The skydiver has the fastest speed at 3 seconds
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Suppose you have the following circuit diagram.Here R1=22k, R2=33k, R3=1.1k, R4=3.3k, R5=33k, R6=11k, R7=33k, R8=1.1k, R9=3.3k are the resistances on the circuit where k stands for kilo ohm. The electromotive forcesof the batteries are E1=3volts and E2=6volts.
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a laser beam is deflected 22.6 degrees by a 30 60 90 prism while passing horizontally through. what is the prism's index of refraction?
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the leaning tower of pisa is 55 m tall and 7 m in diameter. presently, the top is 4.5 m from where it would be if it were straight. how far can the tower move before it would become unstable?
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the rope-and-pulley system of negligible mass shown above supports a block of weight w that is at rest. if the tension throughout the rope is uniform, what is the reading on the spring scale?
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in a forward converter, the flux in the core is brought to zero during every switching cycle before the next cycle begins. this can be done by
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if the distance between a spaceship and the center of the earth is increased from one earth radius to four earth radii, the gravitational force acting on the spaceship becomes approximately?
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a driver in a 1000 kg car traveling at 28 m/s slams on the brakes and skids to a stop. if the coefficient of friction between the tires and the road is 0.80, how long will the skid marks be?
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sir lancelot, who weighs 800 n, is assaulting a castle by climbing a uniform ladder that is 5.0 m long and weighs 180 n. the bottom of the ladder rests on a ledge and leans across the moat in equilibrium against a frictionless, vertical castle wall. the ladder makes an angle of 53.1 deg with the horizontal. lancelot pauses one third of the way up the ladder. (a) find the normal force and friction forces on the base of the ladder. (b) find the minimum coefficient of static friction needed to prevent slipping at the base. (c) find the magnitude and direction of the contact force on the base of the ladder. (that is, the vector sum of the forces at the base.)
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the newly joined elephant member blames the lack of success of the band on the numbers of bits used in sampling the data. a recent publication about bulls and cows and their origin on nearby planets suggests that elephants of one gender are extremely sensitive to small changes in sound amplitude - as opposed to elephants of the opposite gender. if, as the publication claims, those elephants are capable of noticing a 1:297,921 change in sound amplitude then how many bits should be used in the recording per data sample to reproduce this effect?
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in order to treat the horizontal and vertical dimensions of a projectile as separate, which assumption must be true? initial y velocity is zero air resistance is negligible the projectile travels over level ground initial velocity is at a 45 degree angle initial x velocity is zero
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at noon, ship a is 170 km west of ship b. ship a is sailing east at 40 km/h and ship b is sailing north at 25 km/h. how fast is the distance between the ships changing at 4:00 pm?
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you can find the center of gravity of a meter stick by resting it horizontally on your two index fingers, and then slowly drawing your fingers together. first the meter stick will slip on one finger, and then on the other, but eventually the fingers meet at the cg. why does this work?
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what force must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2500 kg car (a big car) resting on the slave cylinder? the master cylinder has a 1.93 cm diameter, while the slave's is 24.9 cm. 1900 n 150 n 15 n 4.1e 06 n 74 n
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the sun has a mass of 2.0 x 1030 kg and radiates energy at the rate of 3.9 x 1026 w. (a) at what rate does the sun transfer its mass to other forms of energy? (b) what fraction of its original mass has the sun lost in this way since it began to burn hydrogen, about 4.5 x 109 y ago?
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