How is a scientific theory different from a hypothesis? a theory is an explanation of a single phenomenon; a hypothesis is a question that can be tested. b. a theory is a well-tested explanation; a hypothesis is a possible answer that needs to be tested. c. a theory and a hypothesis are both educated guesses, but a hypothesis is not proven. d. a theory explains a scientific law; a hypothesis explains a theory.

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?