James runs along the surface of a frozen lake towards Alex. Alex is stationary on both slide an inner tube. James then jumps on the inner tube with Alex and they forward in the same direction that James was initially running in. Ignoring any friction from the surface of the ice, how does the system's momentum that contains both James and Alex on the inner tuber change from James jumping on the tube? a. The system's, momentum increases b. There is not enough information to be able to determine if the system's momentum will change. c. The system's momentum will change depending on their difference in masses. d. The system's momentum doesn't change. e. The system's momentum decreases

Rubber on floor tile has a coefficient of kinetic friction of 1.0 and a coefficient of static friction of 2.0. how much force would a 3.5 lb. robot need to produce in order to start moving?

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

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?