What force keeps a water spider on the surface of water

Steven buys a pair of scissors instead of getting a haircut. He belives the scissors will last for a long time, while the haircut will only last a few weeks. In this case, scissors is a good, while the haircut is a service.

A liquid in a test tube has a curved surface such that the edges touching the glass are higher than the surface at the center. This must mean that the cohesive forces are less than the adhesive forces. True/False

What does each letter in a = (Vf-Vi) / t stand for

An ice skater spins with her arms outstretched at 1 revolution per second. She pulls her arms in toward her body. Does her angular momentum change? Ignore friction with the ice.

A rock is thrown straight up. What is the net external force acting on the rock when it is at the top of its trajectory (ignoring ar resistance) ? a) There is none b) Gravity c) A normal force d) Thrust

A ball is rolling down a hill at + 1.0 m/s, The ball is uniformly accelerating at +4.9 m/s?, What will the ball's velocity be 4.0 s later? +8.9 x 100° m/s +2.0 x 10^1 m/s +2.1 x 10^1 m/s -1.9 x 10^1 m/s

What is the difference between unicellular and multicellular organisms?

Is momentum conserved in the collision?

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.