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In order to measure the radial velocity of a star (the speed of motion towards or away from us) what type of instrument would be used and how would the data be used to derive the velocity?
An aluminum wire has a cross-sectional area of 2.70x 10^-6 m^2 and carries a current of 7.50 A. The mass density of aluminum is 2.70 g/cm^3. find the average speed of the electons in the wire.
The conductive bar is moving with a constant speed v = 6.4 m/s, the magnetic field B = 0.75T, the length of bar inside of B field l = 50cm, How much is the power of the bulb
How much heat does an engine with an efficiency of 26.0% absorb in order to deliver 2.00 kJ of work, How much heat is exhausted by the engine
An AC series circuit has 12.0 ? resistance, 15.00 ? inductive reactance and 10.00 ? capacitive reactance. obtain the power output
Jim's dog Sparky runs 45.0 northeast to a tree, then 75.0 west to a second tree, and finally 15.0 south to a third tree. Calculate the direction of Sparky's net displacement
Three point masses each of mass m are connected by two thin rods each of mass M and length L. The central mass is at an origin and the z-axis is directed out of the page.
The starter motor of a car engine draws an electric current of 42.0 A from the battery. The copper wire to the motor is 6.00 mm in diameter and 1.71 m long, What is the current density in the wire
An airplanes airspeed (relative to still air) is 135 mph. The wind speed relative to the ground is 37 mph and is directed at theta = 51 deg
A fishing line has attached to it a hollow plastic float 2.65 cm in diameter and having a mass of 1.50 g. Find the mass of a lead weight
Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. It is observed on a screen 4.0 m behind the aperture. compute the diameter of the hole
A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.82 of the person's regular weight, Find the direction of the acceleration
When high-energy charged particles move through a transparent medium with a speed greater than the speed of light in that medium, Calculate the speed of the electrons in the water. The speed of light in water is 2.25 108 m/s
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