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A white dwarf star has surface temperature 20 kK.
(a) Where is the Wien peak in this star s blackbody curve?
(b) In what part of the electromagnetic spectrum is that peak?
A total of 2.99·106 electrons are placed on an initially uncharged wire of length 2.25 m. a) What is the magnitude of the electric field a perpendicular distance of 0.494 m away from the midpoint of the wire? b) What is the magnitude of the accele..
A convex mirror has a focal length of -39.0 cm. A 12.0 cm tall object is located 41.0 cm in front of this mirror. Using a ray diagram drawn to scale, determine the size of the image
What is the minimum thickness of the film. what is the magnitude of the average acceleration of the ball through out this time interval.
The string connecting the m1 and the m2 passes over a light frictionless pulley. Given m1 = 1.77 kg, m2 = 7.24 kg, m3=2.23 kg, and g = 9.8 m/s2. The acceleration of gravity is 9.8 m/s2 . Find the downward acceleration of m2 mass.
You are applying a anti reflecting coating to your plane. You don't want to be seen by radar which uses 'light' of wavelength 2cm. determine the minimum thickness of this coating
Consider a 0.200kg pendulum bob that is in an upright circular cylinder with a 0.0193 diameter, Draw a free body diagram and calculate the tension and the centripital acceleration at the bottom of the pendulum's swing
A firefighting crew uses a water cannon that shoots water at 29.0m at a fixed angle of 52.0 degrees above the horizontal. How far from the building should they position their cannon
Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5 mr2.
An iron bar of mass, 0.55 kg, slides down a frictionless incline 0.41 m high. What is the speed of the combined masses after collision
A high-energy pulsed laser emits a 1.2-ns-longpulse of average power 1.3×1011W. Determine the rms value of the electric field
If you supply 1950J of heat to 3.00moles of an ideal diatomic gas initially at 27.0 Celsius in a perfectly rigid container
An 80-N crate slides with constant speed a distance of 5.0 m downward along a rough slope that makes an angle of 30 ° with the horizontal
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