9. What was the average acceleration of the car from 40 seconds to 46 seconds? Include the
correct units. Remember that A means final value minus initial value. What does the
negative number of your

A) 9.2 m/s^2

B) The negative sign means the car is accelerating

C) -9.2 m/s^2

D) The negative sign means the car has crashed

E) -9.2 m/s

F) The negative sign means the car is decelerating

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Positrons are spontaneously emitted from the nuclei of