Stars only form in molecular clouds that contain more than 100 times the mass of our Sun
Indicate whether the statement is true or false
FALSE
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In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
A) it is so far away that we will probably have stopped communicating before we receive and return signal B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life C) the message will be absorbed by interstellar dust before it reaches the cluster D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life
Which of these has the greatest mass?
A) proton B) electron C) both of these D) neither of these
Light of frequency 6.00 × 1014 Hz illuminates a soap film (n = 1.33 ) having air on both sides of it. When viewing the film by reflected light,
what is the minimum thickness of the film that will give an interference maximum when the light is incident normally on it? (c = 3.00 × 108 m/s) A) 24.0 nm B) 94.0 nm C) 188 nm D) 279 nm E) 376 nm
A satellite follows an elliptical orbit about a planet as shown. The speed of the satellite is greatest when the satellite is in position
1) A. 2) B. 3) C. 4) D. 5) same at all points in its orbit. At which position is there no component of force in the direction of the satellite's instantaneous velocity? 6) A 7) B 8) C 9) D 10) A component of force exists in the direction of instantaneous velocity at every point along the orbital path.