In which of these reactions is energy released? A. endothermic reactions B. exothermic reactions C. no reactions D. all reactions

Which is more dense; a marshmallow or a brick of the same size? Explain.

Aipal measures a circuit at 1.2 A and 24. Using Ohm's law, what can he calculate for the circuit?

The student concluded that the current in the LDR is inversely proportional to the potential difference across the LDR. Explain why the student's conclusion is incorrect.

Atoms of which element have two protons and two electrons? a. Carbon b. Helium c. Hydrogen d. Lithium

You have a set of calipers that can measure thicknesses of a few inches with an uncertainty of ± 0.005 inches. You measure the thickness of a deck of 52 cards and get 0.590 in: a.

Object A and B are 10m apart. Which of the following will cause the greatest increase in gravitational force between the objects? A. Increase the mass of object A. B. Increase the mass of object B. C. Increase the distance between objects A and B. D.

A large balloon is initially filled to a volume of 1.96 l at 318.44 k and a pressure of 2.89 atm. what volume of gas will the balloon contain at 1.77 atm and 336.33 k?

What would scorch marks on fabric near bullet wound indicate?

The heat added to a thermodynamic system minus the work done is equal to which of the following? A. the heat lost from the system B. the internal energy C. the total heat added to the system D. the Carnot efficiency of the system E.

How many kilometers are in 14,000 centimeters