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Alan the astronomer is earth-bound and observes two quasars moving away from each other along a line that passes through the earth. Alan observes that each is moving with a speed of 2.1 x 108 m/s relative to the earth. Find at what speed are the quasars moving apart relative to each other?
A 2.1 kg solid sphere ( I= 0.4mR2 ) rolls along a horizontal surface with a speed of 7.8 m/s. What is the total kinetic energy of the sphere
A 22 g ice cube at its melting point is dropped into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 77 k and has a latent heat of vaporization of 200 kJ/kg? Assume for simplicity that the spec..
Starting from rest, a 99 kilogram fire fighter slides down a fire pole. Estimate how far did he slide down the pole
during a 78-ms interval a change in the current in a primary coil occurs. this change leads to the appearance of a
The electron emitted during \(\beta\) in tritium (a hydrogen atom with two neutrons) hasa kinetic energy of 5.7 KeV. What is the deBroglie wavelength for this electron? What is the deBroglie wavelength for this electron? Would you expect such an e..
A light beam traveling in the negative z direction has a magnetic field B=(3.02x10-9T)x + (-5.28x10-9T)y at a given instant of time. The electric field in the beam has a magnitude of 1.82 N/C at the same time. Write the E (electric field) in terms of..
In a Compton scattering experiment, an x-ray photon scatters through an angle of 18.0° from a free electron that is initially at rest. Calculate the angle through which the electron scatters
In parts of the midwestern United States, sirens sound when a severe storm that may produce a tornado is approaching. What beat frequency does Mandy hear
a conductor anchored to the ground receives electrons that arc to it from a van de graaff generator. if the conductor
An experimental measurement has a result 7.95 +- 0.01, and a predicted value of 8.00. What is the percent uncertainty in the measurement
The equation of a transverse wave on a string is y = (4.3 mm) sin[(19 m^-1)x + (300 s^-1)t] The tension in the string is 17 N. (a) What is the wave speed? (b) Find the linear density of this string in grams per meter.
A cylindrical copper cable carries a current of 1040 A. There is a potential difference of 1.60 10-2 V between two points on the cable that are 0.37 m apart. What is the radius of the cable?
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