Which of the following statements about hydropower is true?

A. Dams have little or no impact on native aquatic organisms.
B. Hydropower includes dams, tides, and ocean currents.
C. Dams are relatively inexpensive to build but are expensive to operate.
D. The Wild and Scenic Rivers Act fosters the hydroelectric development of U. S. waterways.
E. Humans downstream of a dam may be exposed to waterborne diseases if the dam breaks.

Apiece of metal 75g at 110°c is dropped in a container with 500g at 20°c. the h2o if temperature is 24°c find specific heat capacity of metal

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2