Newton's Second Law in 1 Dimension: A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing.(a) During this landing maneuver, what must be the thrust due to the rocket's engines?(b) What must be the direction of the engine thrust force?
What will be an ideal response?
(a) 1300 N (b) upward
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Reactance: As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A. approaches zero. B. approaches one. C. approaches infinity. D. becomes negative.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?
a. 105 N/C b. 15 N/C c. 75 N/C d. 45 N/C e. 60 N/C
What happens after many generations of the star-gas-star cycle?
A) The heavy element abundance decreases; the amount of gas increases. B) The heavy element abundance increases; the amount of gas decreases. C) The heavy element abundance increases; the amount of gas stays the same. D) The amount of gas and heavy elements stay the same: it's a cycle. E) The heavy element abundance stays the same; the amount of gas decreases. F) The heavy element abundance increases; the amount of gas increases.
Compared to an open cluster, a globular cluster will have more hot, blue stars
Indicate whether the statement is true or false