Which of the following would be a good question that could be scientifically investigated?

a. what is the correct way to pursue happiness in life?
b. can play the piano at a shower tempo improve the sound quality?
c. what is the best advice a parent can give a child?
d. does lack of sunlight affect plant growth?

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?