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Calculate the thermal broadening for a Ca II K line at 3933 A, given stellar photospheric temperatures of 3000,6000 and 9000K. Interpret the results and discuss the effect of temperature on this line profile.
An object moves uniformly around a circular path of radius 20.5 cm, making one complete revolution every 2.40 s. What is the translational speed of the object
Consider a capacitor consisting of two identical metal plates parallel to each other. Each plate has an area of 140 cm2 and they are separated by 2.7 mm. Find the capacitance of the capacitor
A hall sensor made from silicon is 0.40 nm thick and has a charge carrier density of 2.0 x 10 ^19 m^-3. What is the value of the magnetic field
Estimate how many books can be shelved in a college library with 3400 of floor space. Assume 5 shelves high, having books on both sides
A coil of wire with a resistance of 0.45 ohm has a self-inductance of 0.083 H. If a 3.0-V battery is connect across the ends of the coil, what is the stored energy in the inductor
A 0.460-kg toy is undergoing SHM on the end of a horizontal spring with force constant k = 500 N/m. find the maximum speed attained by the object during its motion
A compound microscope has a barrel whose length is 19.7 cm and an eyepiece whose focal length is 1.7 cm. What focal length must the objective have so the angular magnification of the microscope is -330
What frequency will hear after the train passes
A car is driving directly north on the freeway at a speed of 117 km/h and a truck is leaving the freeway driving 76 km/h in a direction that is 40° west of north. What is the velocity of the truck relative to the car?
A 74- kg ice hockey player standing on a frictionless sheet of ice throws a 6.2- kg bowling ball horizontally with a speed of 3.9 m/s. what speed does the hockey player recoil
A mass on a spring bobs up and down over a distance of 29 cm from the top to the bottom of its path four times each second. What are its period and amplitude
A small block with mass 0.0475kg slides in a vertical circle of radius 0.0710m on the inside of a circular track. What is the magnitude of the normal force that the track exerts on the block when it is at the top of its path
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