A. The current through a lamp connected across 154 V is 1.25 A when the lamp is on. What is the lamp’s resistance when it is on (and hot)? b. When the lamp is COLD, its resistance is one forth as large as it is when the lamp is hot. What is its COLD resistance?

c. Then what would the current through the lamp be just after it is turned on, when it is still cold? (Still connected to a potential difference of 154 V.)

What is hidden during a lunar eclipse? isn't the moon hidden?

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Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?