Physics, 21.02.2020 04:32, winterblackburn78
A protostar's radius decreases by a factor of 100 and its surface temperature increases by a factor of two before it becomes a main sequence star. Its luminosity: A. Decreases by a factor of 160,000 B. Decreases by a factor of 625 C. Decreases by a factor of 40 D. Increases by a factor of 40 E. Increases by a factor of 625 F. Increases by a factor of 160,000
Answers: 1
Physics, 21.06.2019 22:20, lunamoon1
The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?
Answers: 2
Physics, 22.06.2019 14:00, batmanmarie2004
Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?
Answers: 1
A protostar's radius decreases by a factor of 100 and its surface temperature increases by a factor...
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