A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The displacement vector from the equilibrium position has its largest magnitude
a. True
b. False
Indicate whether the statement is true or false
True
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A rocket with initial mass of 3.0 × 10^4 kg fires its engines at t = 0 . The exhaust speed of the rocket is 3.9 × 10^3 m/s. If the velocity of the rocket at t = 200 s is 1 500 m/s, how much fuel did it consume?
a. 9.6 × 10^3 kg b. 3.0 × 10^4 kg c. 4.4 × 10^4 kg d. 4.8 × 10^3 kg
Which of the following is not an advantage of spacecraft flybys over ground-based telescope observations?
A) Spacecraft can sample the gravitational field of a planet. B) Spacecraft can view "backlit" views of planetary rings. C) Spacecraft can measure local magnetic fields. D) Spacecraft can monitor changes in a planet's atmosphere over long times. E) Spacecraft can make highly detailed images of the planet and its moons.
What produces the 21-cm line that we use to map out the Milky Way Galaxy?
A) atomic hydrogen B) ionized hydrogen C) molecular hydrogen D) carbon monoxide E) helium
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1000 m, but the speed remained the same, by what factor would its centripetal acceleration change?
A. 0.25 B. 0.50 C. 1.00 D. 2.00 E. 4.00