Which of the following are ways to improve muscle endurance:

a. run as many miles as you can.
b. start an activity that is difficult and master it.
c. increase your activities that involve your muscles as they become easier to perform.
d. log your use of muscles and start using different ones if you see a pattern.
e. coordination

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.