Dripstone formations that form on cavern ceilings are called ______________
Fill in the blank(s) with correct word
stalactites
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If the light takes 8 minutes to reach Earth from the Sun and the nearest star is 4.7 ly from the Sun, what is the distance from the Sun to the nearest star in astronomical units?
a. 37.6 AU b. 1.7 AU c. 214 AU d. 310,000 AU e. 1.5 × 10^11 AU
Which of the following is not a major idea of Einstein's general theory of relativity?
A) Time runs slower near strong gravitational fields. B) It is possible to travel through wormholes. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20
What horizontal force must be applied to the box to cause it to start sliding along the surface?
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 m T magnetic field is perpendicular to both the rod and its velocity. What is the potential difference between the ends of the rod?
A. 12 mV B. 60 mV C. 30 mV D. 15 mV E. 0