Master Physics with Fun Quizzes & Brain Teasers!

Bead A has a mass of 17 g and a charge of -4.9 nC . Bead B has a mass of 30 g and a charge of -12.8 nC . The beads are held 14 cm apart (measured between their centers) and released.What maximum speed is achieved by each bead?
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what is an important characteristic of fiber optics?
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Ionization is the loss or gain of an electron in the atom or molecule. true or false
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a certain reaction has an enthalpy of =34 kj and an activation energy of a=66 kj. what is the activation energy of the reverse reaction?
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if the magnet in the buoy described in everyday phenomena box 15.1 is tethered to the ocean floor and does not move up and down how does it take advantage of the wave motion to generate power
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sunlight strikes the surface of a lake at an angle of incidence of 42.0. at what angle with respect to the normal would a fish see the sun?
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if the 80-kg cabinet is allowed to roll down the inclined plane, determine the acceleration of the cabinet and the normal reactions on the pair of rollers at a and b that have negligible mass.
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find the velocity, acceleration, and speed of a particle with the given position function. r(t) = 9 cos(t)i 8 sin(t)j
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Realizing that she often doesn't have her students' full attention during class, a professor devises an elaborate device on which to stand while she lectures. (Figure 1) The pulley is placed so that the string makes a 45.0-degree angle with the beam. The beam is uniform, 5.00 meters long, and has weight wb . The professor stands 2.00 meters from the pivot point and has weight wp .Find the tension T in the rope in terms of the professor's weight wp and the weight of the beam wb .
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A thin, 83.0 cm wire has a mass of 16.5 g. One end is tied to a nail, and the other end is attached to a screw that can be adjusted to vary the tension in the wire. To what tension (in newtons) must you adjust the screw so that a transverse wave of wavelength 3.33 cm makes 625 vibrations per second?
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the mass of jupiter is 3 kg times greater than the mass of the earth and its radius is 11 times greater than the radius of the earth if the value 'g' is 9.8 m/s2 on the earth calculate the 'g' pf the jupiter
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11.252#The figure above shows the paths of two stars of equal mass as they orbit their common center of mass. Thepositions of the stars at four different times are labeled in the figure. At which of the positions do the stars have theirgreatest speed?pet ni awoda in the basis8-1(A) Position 2 only(B) Position 4 only(C) Positions I and 3 only(D) All of the positions, since the stars move with constant speedWoypsed to becomesFestpre vlloF-a201
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A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 4.1s later. The speed of sound in air is 343 m/s. How high is the cliff?
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an object of mass m hangs from a string that is looped around a pulley of negligible friction, as shown. the pulley has a mass 0.5m. the object is released from rest and it falls to the floor at time t1. which of the following pairs of graphs best represents the angular speed as a function of time for the pulley and the vertical speed as a function of time for the falling object for a short time after it is released from rest?
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monochromatic light is incident on a pair of slits that are separated by 0.250 mm. the screen is 2.90 m away from the slits. (assume the small-angle approximation is valid here.) (a) if the distance between the central bright fringe and either of the adjacent bright fringes is 1.62 cm, find the wavelength of the incident light.
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what mass (in g) does 3.99 moles of kr have? a) 334 g b) 476 g c) 211 g d) 240 g e) 144 g
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when the current has magnitude 3.00 aa , at what rate is energy being stored in the capacitor?
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an electron is trapped in an infinite potential well. find its first five energy levels. the width of the potential well is: case 1. 0.10 nanometer case 2. 0.20 nanometer
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A 4.7-kg steel ball is dropped from a height of 21m into a box of sand and sinks 0.20m into the sand before stopping.A. How much energy is dissipated through the interaction with the sand?
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if each suction cup has an area of 40.0 cm2, what is the maximum mass they can support?
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A 1000-turn coil of wire 2.40cm in diameter is in a magnetic field that increases from 0 T to 0.120T in 9.00ms . The axis of the coil is parallel to the field. What is the emf of the coil?
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when 68.00 j of energy are added to a sample of gallium that is initially at 25.0 c, the temperature rises to 38.0 c. what is the volume of the sample?
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What is meant by the line of best fit?A. The line passes through as many data points as possible. B. The sum of the squares of the horizontal distances from each point to the line is at aminimum.C. The sum of the squares of the vertical distances from each point to the line is at a minimum.D. The line passes through as many non outlier data points as possible.E. The line passes through as many data points as possible, and the origin.
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A two-slit pattern is viewed on a screen 1.50m from the slits.If the two third-order minima are 23.5cm apart, what is the width of the central bright fringe?
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