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The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume e=1 for these surfaces.
a) Find the radius of the star (assumed to be spherical) Rigel, the bright blue star in the constellation Orion, that radiates energy at a rate of and has surface temperature 11000.
b) Find the radius of the star (assumed to be spherical) Procyon B (only visible using a telescope), that radiates energy at a rate of and has surface temperature 10000.
In one such decay, the electron and the neutrino are emitted at right angles to each other. The electron(mass 9.11 x 10^-31kg) has a speed of 5.00×10^7m/s and the neutrino has a momentum of 8.10×10^-24kg m/s. What is the recoil speed of the nucleu..
A 0.599 kg object is at rest at the origin of a coordinate system. A 3.76 N force in the positive x direction acts on the object for 2.46 s. What is the velocity at the end of this interval
If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop?
A car drives north at 42 mi/h for 10 {rm min} and then turns east and goes 5.0 {rm mi} at 62 mi/h. at last, it goes southwest at 30 mi/h for 6.0 {rm min}.
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another, What is the speed of the second train
A roller coaster goes 26 m along a section of track sloping 10 degrees below the horizontal, followed by a 15-m section sloping upward at 6 degrees, followed by an 18-m section of level track. Find the net displacement.
Sally travels by car from one city to another. She drives for 24 min at 63.0 km/h, 52.0 min at 42.0 km/h, and 18.0 min at 81.0 km/h, and she spends 5 min eating lunch and buying gas.
The driver of a 1485 kg car is driving along a street at 25.0 mph. Another driver, coming from directly behind, with what combined speed do they begin to skid
A thick copper wire of length 10 m is observed to stretch 0.10 cm. What is the strain? If the applied force is 50,000 N, what is the diameter of the wire
q1. if air drag is negligibly small how fast is sequoia cone moving while it reaches the ground if it dropped from the
Water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm. What is the pressure at the valve
Suppose atmospheric pressure at Denver is 1.0135 × 105 N/m2 today. How high will the water column stand on the barometer tube
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