A ping-pong ball is moving at 7.55 m/s at right angles to Earth’s 44.0 μT magnetic field. How much charge would you need to put on the 2.70 g ping-pong ball so that the magnetic force on the ball is equal in magnitude to the gravitational force on the ball? Assume g = 9.80 m/s2 . Note: The charge is unrealistically large!

Athermometer is removed from a room where the temperature is 70° f and is taken outside, where the air temperature is 10° f. after one-half minute the thermometer reads 60° f. what is the reading of the thermometer at t = 1 min? (round your answer to two decimal places.) ° f how long will it take for the thermometer to reach 30° f? (round your answer to two decimal places.)

Drag each item into the proper state of matter category.

Which of these metals are magnetic?