There are three ways to give an object a static charge. they are friction, conduction and induction. two pieces of cellophane tape are stuck to a lab table. each piece is quickly ripped off the table. a student attempts to bring the two pieces of tape together, but the tape is attracted to her hand. so, the tape clings to her hand. formulate a possible explanation for this. a) the adhesive on the tape sticks to the student's hand. b) the charges are conducted onto the student's hand and then the tape is attracted to her hand. c) the tape is charged by friction and her hand has an induced opposite charge. they therefore attract. d) the tape is charged by friction and the human body is naturally charged. so, the tape is attracted to her hand. eliminate

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

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?

By what primary heat transfer mechanism does the sun warm the earth?