A student performs an activity in which a large tank is filled with salt water. An ice block is placed at one end and a heat lamp at the other end. The student adds a drop of color dye in the water near the ice block. The color dye sinks near the ice block and rises near the heat lamp, as shown by the arrows. Which conclusion can be made about ocean currents from the activity?

Surface wind changes the density of water in the ocean, causing ocean currents to sink.

Heat from Earth’s interior creates pockets of warm air, causing ocean currents to circulate.

Ice found near Earth’s poles adds more salt to the ocean, forming ocean currents

Energy from the atmosphere causes convection of water, forming ocean currents.

The ballistic pendulum was invented in 1742 by english mathematician benjamin robins. it consists of an initially stationary pendulum that moves after being struck by a bullet, and it is used to measure the original velocity of the bullet. the known variables are the bullet's mass m, the pendulum's mass m, and the height to which the block and bullet swing, determined by the length of the pendulum l and final angle θ. two principles of physics are necessary to solve for the bullet's original velocity. what are these principles? conservation of momentum and newton's third law conservation of energy and conservation of angular momentum grade summary deductions 0% potential 100% conservation of momentum and newton's second law. newton's second law and conservation of angular momentum. conservation of energy and newton's third law conservation of momentum and conservation of angular momentum. conservation of momentum and conservation of energy conservation of energy and newton's second law.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

What is required for an electric charge to flow through a wire? zero resistance in the wire a balance of electric potential high resistance in the wire a difference in electric potential