(b) Suppose a horizontal circular loop of wire has a diameter of 7cm and is lowered into sample of crude oil and suppose the additional force that is required to pull the loop out of the oil is 0.08N. Calculate
the surface tension of the sample of crude oil. (2 marks)​

It is really hard for me right know

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.