What forces are present in this situation? An elevator is rising at a constant speed; the elevator is the object in this situation.
A. gravity and tension
B. normal, gravity, and tension
C. normal and tension
D. gravity

A. Gravity and Tension

Explanation:

Gravity and Tension would be the only things changing the rising speed of the elevator.

Normal makes no sense not sure why that is an answer.

Gravity effects how much Tension is pulling on the elevator to go down while the elevator is pushing up.

Let me know if you have any other questions.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

a electronegativity decreases beacuse the size of nucleus is bigger.