1. Earth as a “closed system 2. energy from the sun
3. mercury, lead, and some
plastics
4. may be broken down by
natural processes
5. the number and variety of
species that live in the area
A. Biodiversity
B. Biodegradable
C. Renewable resources
E. Spaceship earth

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s