Why was it surprising to find three planets orbiting a pulsar?
What will be an ideal response?
The supernova explosion should have destroyed any terrestrial planets that close to the original star.
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A transformer transforms voltage while
A) producing energy. B) producing power. C) transferring energy from one coil to another. D) transferring current from one coil to another.
The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms. B) 44 ohms. C) 220 ohms. D) 440 ohms. E) none of the above
The ionosphere reflects high frequency radio waves
a. True b. False Indicate whether the statement is true or false
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. -0.29 kJ c. +30 J d. -30 J e. -50 J