When did the heavy bombardment end?
A) about 4.5 billion years ago
B) between about 4.3 and 4.5 billion years ago
C) between about 3.8 and 4.0 billion years ago
D) exactly 3.95 billion years ago
C) between about 3.8 and 4.0 billion years ago
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Two boxes are connected by a weightless cord running over a very light frictionless pulley as shown in the figure. Box A, of mass 8.0 kg, is initially at rest on the top of the table
The coefficient of kinetic friction between box A and the table is 0.10. Box B has a mass of 15.0 kg, and the system begins to move just after it is released. (a) Draw the free-body diagrams for each of the boxes, identifying all of the forces acting on each one. (b) Calculate the acceleration of each box. (c) What is the tension in the cord? What will be an ideal response?
Which of the Galilean moons is the densest and most geologically active?
A) Io B) Europa C) Ganymede D) Callisto E) Titan
A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70-meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?
Assuming the Hubble constant is (21 km/s)/(106 ly), what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly)
a. 4200 km/s c. 640 km/s b. 21,000 km/s d. 7000 km/s