Conservation of Momentum: In a police ballistics test, 2.00-g bullet traveling at 700 m/s suddenly hits and becomes embedded in a stationary 5.00-kg wood block. What is the speed of the block immediately after the bullet has stopped moving relative to the block?
Fill in the blank(s) with the appropriate word(s).
0.280 m/s
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Satellite Motion: The captain of a spaceship orbiting planet X discovers that to remain in orbit at 410 km from the planet's center, she needs to maintain a speed of 68 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.8 × 1019 kg B. 4.2 × 1017 kg C. 2.8 × 1016 kg D. 4.2 × 1014 kg
General relativity explains gravity as the ________ of spacetime
Fill in the blank(s) with correct word
The half-life of radium is
A) the time after which an individual radium atom splits in half. B) the time during which half of a large number of radium atoms will decay. C) half the lifetime of the individual radium atom. D) the life-time of the individual radium atom. E) half of the total time during which a quantity of radium will radioactively decay.
The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the ______________ sphere
Fill in the blank(s) with correct word