At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three directions. as a result, three forces act on the ball, , , and (see the drawing). the magnitudes of and are f1 = 61.0 newtons (n) and f2 = 66.0 n. determine (a) the magnitude of and (b) the angle θ such that the resultant force acting on the ball is zero.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.

What is the percent yield of titanium (iv0 oxide, if 10.2 are formed when 25.7g of titanium (iv0 chloride react?