Estimate the time T100 it takes a good human swimmer, 1.80-m tall, to swim 100 m. Assume that the speed of the swimmer is limited by his or her height. Express the time numerically, in seconds, to three significant figures.

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

Apackage of supplies is dropped from a plane, and one second later a second package is dropped. neglecting air resistance, the relative velocity of the 1st package viewed from the second will 56) a) increase. b) be constant. c) be zero. d) depend upon their weight. e) decrease

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the