(a) steve exerts a steady force of magnitude 210n (about 47 lb.) on the stalled car in fig. 6.3 as he pushesit a distance of 18 m. the care also has a flat tire, so to make the car track straight steve must push at an angle of 30 degrees to the direction of motion. how much work does steve do? (b) refer to book.

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

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.