Denote the speeds of block at point a and a ′ (the same point for different two cases) to be va and va′ respectively. What is the ratio of the speeds va va′ ?.

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

The graph shows the populations of two species in a particular region over two decades. based on the graph, what can you conclude about the relationship between the two species? a. the two species have a parasitic relationship. b. the two species are mutualistic in nature. c. the two species exhibit commensalism. d. the two species have a prey-predator relationship. e. the two species have a familial relationship.

Compared with the cost of tuition, fees, and books for a traditional college course, the cost of a clep exam is: