Which of the following is an example of convection?

A. hot air rising and cooler air falling

B. a hot object transferring heat to a cooler one

C. a hot oven warming the air around it

D. the rays of the Sun warming the earth

The power grid is the system that transfers electricity to homes and businesses. A power plant produces electricity. The output electricity is an input for the wires that lead to power sub stations.

What creates push in a electrical circuit

Which best describes how magnesium and oxygen bond? a. they form an ionic bond by exchanging two electrons. b. they form an ionic bond by exchanging three electrons. c. they form a covalent bond by sharing one electron. d.

Explain how we know dark matter exists if we cannot see it

Which type of mirror causes light to spread out? a convex mirror a concave mirror a plane mirror

Tom stops using a new skin cream for five days to determine if the cream is the cause of a recent rash. What stage of the scientific method is Tom using?

Use your observations to determine qualitatively how the strength of the electric interaction between charged objects depends on the distance between them. Explain your reasoning (this is trickier than it might seem at first).

Far from any other masses, two masses, m1 and m2, are interacting gravitationally. The value for the mass of m1 suddenly doubles. What happens to the value of the gravitational force that mass m2 exerts on mass m1?

Which of the outer planets are most like Earth? How?

The pressure inside a champagne bottle can be quite high and can launch a cork explosively. Suppose you open a bottle at sea level. The absolute pressure inside a champagne bottle is 6 times atmospheric pressure; the cork has a mass of 7.