Young open clusters contain a lot of hot, young blue-white stars
Indicate whether the statement is true or false
TRUE
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When you remove electrons from a metal cup, the cup becomes
A) negatively charged. B) positively charged. C) ionized.
Planet Roton has a mass of 4.0 × 10^23 kg and a radius of 2.0 × 10^6 m. With what speed should a space probe be launched from the surface of Roton so as to achieve a maximum distance of 3.0 × 10^6 m from the center of Roton?
a. 4.2 km/s b. 3.9 km/s c. 3.0 km/s d. 3.4 km/s e. 6.0 km/s
A charge of 2.0 ?C flows onto the plates of a capacitor when it is connected to a 12. V battery. How much work was done in charging this capacitor?
A) 24. ?J B) 12. ?J C) 48. ?J D) 0.14 mJ E) 21. ?J
Suppose that Hubble's constant were 11 km/s/million light-years instead of 22 km/s/million light-years. How would this graph look different?
A) The data would follow a much steeper, almost vertical line. B) The data would follow a more shallow line, closer to horizontal than the current line. C) The data would follow a flat, horizontal line. D) The graph would have to show luminosity on the vertical axis, rather than velocity.