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Rotation in the Milky Way: as I mentioned the rotation speed of the sun around the Milky Way center is approximately 200 km/s (actually to be precise, it's 220 km/s), and that it takes the sun around 200 million years to orbit once around center of the Galaxy.
Given that the rotation curve is relatively flat (ie the rotation speed stays the same as function of distance), how long does it take to make one full orbit for a star that is two times further from Milky Way center than the Sun?
During an action potential, Na+ ions move into the cell at a rate of about 3×10^?7mol/m2?s. How much power must be produced by the "active Na+ pumping" system
The diameter of a blood vessel narrows by 70% due to the presence of a plaque on the blood vessel walls. what is the systolic blood pressure in the narrowed vein (in mmHg)
A rock is suspended by a light string. When the rock is in air, the tension in the string is 40.6 N. When the rock is totally immersed in water, What is the density of the unknown liquid
A -50 nC charged particle is in a uniform electric field {E} = (10 V/m, east). An external force moves the particle 1.0 m north, then 6.0 m east, How much work is done on it by the external force
An electric power plant that would make use of the temperature gradient in the ocean has been proposed. What is the maximum efficiency of such a system
Light of wavelength 650 nm falls on a 0.48 mm wide slit and forms a diffraction pattern on a screen 1.8 m away.
What is the maximum load that could be suspended from a copper wire of length 1.0 m and radius 1.0 mm without breaking the wire? Copperhas an elastic limit of 2.0 x 10^8 Pa and a tensile strength of 4.0 x 10^8 Pa.
Electrons in a photoelectric experiment emerge from an aluminum surface with a maximum kinetic energy of 1.3eV
A flywheel having constant angular acceleration requires 4.60 to rotate through 170 . Its angular velocity at the end of this time is 104. Find the angular velocity at the beginning of the 4.60 interval; the angular acceleration of the flywheel.
Charges of 3.0 nC, -2.0 nC, -7.0 nC, and 1.0 nC are contained inside a rectangular box with length 1.0 m, width 2.0 m, What is the electric flux through the surface of the box
The sound level 23 m from a loudspeaker is 65 dB. What is the rate at which sound energy is produced by the loudspeaker
two point charges of 50 nc are each placed at the two vertices of an equilateral triangle of side 2.0 m. find the
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