A150-kg crate rests in the bed of a truck that slows from 50 km/h to a stop in 12 s. the coefficient of static friction between the crate and the truck bed is 0.655.(a) will the crate slide during the braking period? explain your answer.(b) give the range of stopping times for the truck that will prevent the crate from sliding.

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?