Light from an ideal spherical blackbody 19.0 cmcm in diameter is analyzed by using a diffraction grating that has 3650 lines/cmlines/cm . When you shine this light through the grating, you observe that the peak-intensity wavelength forms a first-order bright fringe at ±± 14.2° from the central bright fringe. Required:
a. What is the temperature of the blackbody?
b. How long will it take this sphere to radiate 16.0 MJ of energy?

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

A- a of 8.00 cm a of 34.0 nc. a , -, a of 25.0 nc is on of a of 15.0 cm .be toto aof ? a) b) c) j d) e)

What is the most useful equation for electric power?