A balloon is waiting to take off. As seen in the figure below, the balloon's basket sits on
a platform which rests on the ground. The
balloon is pulling up on the basket, but not
hard enough to lift it off the platform.
balloon
platform
basket
ground
What is the free-body diagram for the plat-
form? Some parallel vectors are offset hori-
zontally for clarity.

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places

(8%) problem 12. a bowling ball of mass mb 3 kg 's rolled down the lane with a velocity ofy-2/ m s lt strikes a single remaining pin mp 0.93 kg head on. after the collision the bowling ball has a velocity (in the same direction) of v2 1.1 m/s. = ▲ 33% part (a) write an expression for the velocity of pin in the horizontal direction after the impact, im ,, 33% part (b) what is the pins speed in ms? 33% part (c) assuming the coefficient of friction s μ,-0.1. how far in meters could the pin slide before stopping if it doesn't topple?

Explain the difference in reactivity of the elements based on their electron configurations.