Taking the direction west to be positive, and east to be negative, what is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 seconds? A. 2.5 m/s2 B. 0.4 m/s2 C. - 0.4 m/s2 D. - 2.5 m/s2

A sled is moving at a constant speed down a surface inclined at 45 degrees with the horizontal and travels 30meter in 4 seconds. calculate the vertical velocity of the self at the end of 4 seconds

Which of the following are true about centripetal force? Check all that apply. A. Without centripetal force, an object cannot accelerate. B. Friction can be a centripetal force, such as when it keeps a car on the road going around a curve. C.

A pipe that is 0.92 m long and open at both ends vibrates in the second overtone with a frequency of 584 Hz. What is the speed of sound in the air in this pipe

Why are humans common ancestor of fish and reptiles

A hockey player has an acceleration of - 3.1m/s. how long does it take him to come to a complete stop from a speed if 13m/s

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?

What does the ozone layer absorb? a. Microwaves c. UV radiation b. X-rays d. Infra-red radiation

An object is undergoing shm with period 0.900 s and amplitude 0.320 m. at t = 0 the object is at x = 0.320 m and is instantaneously at rest. calculate the time it takes the object to go (a) from x = 0.320 m to x = 0.160 m and (b) from x = 0.

Your friend states in a report that the average time required to circle a 1.0-mi track was 49.325 s. This was measured by timing 10 laps using a stopwatch with a precision of 0.01 s. Do you believe his results are reliable? Explain.