A train with mass 1.8 x 10^3 kg is moving to the right with a speed of 15 m/s when the engineer applies the brakes. If the braking force is 3.4 x 10^4 N, how long will it take for the train to come to rest?

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.)

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?