Aroller coaster (378 kg) moves from a (3.24 m above the ground) to b (28.3 m above the ground). two non-conservative forces are present: friction does -2.84 x 104 j of work on the car, and a chain mechanism does +5.24 x 104 j of work to the car up a long climb. what is the change in the car's kinetic energy kef - keo from a to b?

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.

Drag each item into the proper state of matter category.