Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes (fig. P5. 90). (a) which way will the system move when the blocks are released from rest? (b) what is the acceleration of the blocks? (c) what is the tension in the cord?.

Earth's atmosphere is unique among the planets and is able to support life because it contains a large amount of a) oxygen b) helium c) methane d) carbon dioxide

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

Essay questions may also be referred to as a. talk questions c. hard questions b. explain questions d. think questions