Salmon often jump waterfalls to reach their breeding grounds. Starting downstream, 2.85 m away from a waterfall 0.602 m in height, at what minimum speed must a salmon jumping at an angle of 28.5◦ leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s^2. Answer in units of m/s.

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

If you put a helium-filled balloon in the refrigerator, what will happen?