How do these emission spectra compared in terms of colors and line positions?

The circuit above contains 5 resistors (r1, r2, ra, rb, rc) with equal resistance r. write an equation for the current i2 in terms of the current i1. (when entering your answer, use i1 for i1, e. g., the answer 0.5*i1 has the correct syntax) i2 =

The force pressing two stacked objects together is equal to the weight of the object on top. The friction between a piece of wood on a stone surface is 22.5 newtons.

The buoyant force increases as you push an inflated beach ball under the water's surface. When will the force stop increasing? Explain your reasoning.

A student wants to demonstrate entropy using the songs on her portable music player. What should she do to demonstrate the lowest entropy?

Which best describes how the current scientific model of the atom was developed?

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?