Two people, one with mass m1 and the other with mass m2, stand on a stationary sled with mass m on a frozen lake. assume that the ice is frictionless. a) the first person (with mass m1) jumps off the sled with a velocity −sxˆ relative to the (stationary) sled. what is his velocity? use conservation of momentum to find the velocity of the sled (which is still carrying the second person).

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

Geologists get to play with chemistry, physics, and history! and what a history you will meet as youwork your way through the course. starting at the beginning, the textbook provides the scientifically acceptedstart of the and promises that you'll get to explore some of the evidence for that scientific view, later inthe semester. meanwhile, which is more nearly correct of the scientifically accepted view? a) the earth formed when the big bang caused older materials to fall together, about 14 billion years ago.b) the earth formed from the falling together of older materials, about 4.6 billion years ago.c) the earth formed in the big bang, about 6000 years ago.d) the earth is eternal, having been here forever and promising to be here forever.e) the earth was assembled by gigantic space beavers, which gnawed down the primordial tree of life andpiled its branches together to form the planet.

Asimple electrochemical cell contains two electrodes? t or f