Gaps in the asteroid belt (often called Kirkwood gaps) are caused by ________
A) tidal forces from Jupiter
B) tidal forces from the Sun
C) the competing gravitational tugs of Mars and Jupiter
D) orbital resonances with Jupiter
D
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How fast is a galaxy at a distance of 300 Mpc receding from us?
A: 300 km/s B: 300,000 km/s C: 240 km/s D: 21,600 km/s E: 7,200 km/s
A uniform disk with mass M and radius R sits at rest on an incline 30° to the horizontal. A string is wound around disk and attached to top of incline as shown. The string is parallel to incline. The friction force acting at the contact point is:
A quantum of electromagnetic radiation is a __________
Fill in the blank(s) with correct word
Resolution: The two stars in a binary star system have an angular separation of 1.0 × 10-5 rad. If the wavelength of the light from the system is 500 nm, what is the smallest diameter aperture telescope that could just resolve this system to show that it contains two stars?
A. 0.50 cm B. 0.61 cm C. 5.0 cm D. 6.1 cm