PLS HELP ASAP (no links) WILL MARK YOU

You find a ring with a mass of
13.5g. You fill a graduated
cylinder with 10 ml of water and
put the ring into the cylinder. The
water rises to 15 ml. What is the
substance?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

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?