A 4.5 kg block is pulled across a table by a horizontal force of 42 N. The frictional force opposing the motion is 7.5 N. Calculate the acceleration of the object.

Aresearcher plans to conduct a test of hypotheses at the 1% significance level. she designs her study to have a power of 0.90 at a particular alternative value of the parameter of interest. the probability that the researcher will commit a type ii error for the particular alternative value of the parameter at which she computed the power is: a. 0.90. b. 0.01. c. 0.10. d. equal to 1

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z