HELLLP PHYSICS An object with mass M attached to the end of a string and is raised vertically at a constant acceleration of g/8. If it has been raised a distance ℓ from rest, how much work has been done by the tension in the string?

A. (−9M g ℓ)/8

B. (−M g ℓ)/8

C. (M g ℓ)/4

D. (M g ℓ)

E. (9M g ℓ)/8

F. (M g ℓ)/8

G. (−M g ℓ)

H. (−M g ℓ)/4

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

Which of the following should not be included in a great summary? a. blaming your lab partner b. new questions your experiment has generated c. your prediction d. your investigation plan