What three things happen when air is warmed?

it expands

it contracts

it becomes lighter

it becomes heavier

it rises

it sinks

How can an object overcome static friction?

Deep currents circulate seawater around the globe due to differences in the density of water at different locations. Two factors that can alter the density of water are salinitymarine lifespecific heat and windtemperatureEarth's rotation.

Billy is pushing a book with a force of 100N to the left, and Johnny is pushing the same book with a force of 80N to the right. What is the Fnet? 20N to the left 20N to the right 20n to the right 20n to the left

In a double-slit interference experiment, interference fringes are observed on a distant screen. The width of both slits is then doubled without changing the distance between their centers. a. What happens to the spacing of the fringes? b.

A thin film of polystyrene is used as an antireflective coating for fabulite (known as the substrate). the index of refraction of the polystyrene is 1.49, and the index of refraction of the fabulite is 2.409.

Two trains leave the same station at the same time. The first train travels north at 60 mph. The second train travels west at 45 mph. Find how fast the distance between the trains is changing two hours after the trains have left.

If the room radius is 4.5 m, and the rotation frequency is 0.8 revolutions per second when the floor drops out, what is the minimum coefficient of static friction so that the people will not slip down?

Energy of motion is known as what energy

While a constant total force of 17 n is exerted on a cart, the cart's acceleration is 5 m/s2. find the mass of the cart?

Which of the following is NOT a possible cause of a genetic disorder in humans? changes in the number of chromosomes mutations in the DNA of genes being born underweight changes in the structure of chromosomes