l _ U1 On a 20 mile bike ride =you ride the rst 10 miles at an average speed of 8 mi 3h. What must your average speed over the next 10 miles be to have your average speed for the total 20 miles be (a) 4 mph '3' (b) 12 mph '? (c) Given this average speed for the first 10 miles , can you possibly attain an average speed of 16 mph for the total 20 mile ride '3' Explain The moon. is accelerating toward the earth _ Why isn't it getting clow to us ? In fact , it is getting further awayr .W'hy '? A projectile is red from height ,3: above the ground =oriented upward at an angle 9 above the horizontal , with an initial speed at. a. What is its maximum height '? b. At this height , what is its velocity and its acceleration '? c. How far does it travel '3' d. How long is it airborne '? In a rainstorm with a strong wind ,what determines the best position in which to hold an umbrella ? Las Cruces is at 32 latitude .Find the di'erence between Las Cruces and a location on the equator for : a. The velocity due to Earth's rotation b. The acceleration due to Earth's rotation Is there anywhere on the planet that is unaffected by Earth's rotation '? Why '? An object of mass m is at rest in equilibrium at the origin .At 1' = 0 a new force F0) is applied that has components F10): ki+ k2}: FUR): k3: where k1, k}, and It] are constants . Calculate the position r( I) and velocity v03) vectors as functions of time _ In a world without friction , which of the following activities could you do (or not do )? Explain your reasoning (a) drive around an unbanked highway curve (b) jump into the air (c) start walking on a horizontal sidewalk (d) climb a vertical ladder (e) change lanes on the freeway