Find δerxn for the combustion of naphthalene. the heat capacity of the calorimeter, determined in separate experiment, is 5.11kj/∘

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How might circuits be used to make a device or a home more energy efficient

what is the mass number in atomic mass units of an atom with 14 protons, 14 electrons, and 16 neutrons

How does the sun impact land at different latitudes?

space station in the space suit, carrying his Tom Corbett Space Cadet lunchbox. As he is moving along outside the space station, in the vacuum of space, he accidentally lets go of the lunch box. What would happen to it?

What size force will open a door of area 1.54m^2 if the net pressure on the door is 1.013 * 10^3 Pa?

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?

A skydiver with a mass of 60 kg jumps from an airplane. Five seconds after jumping the force of air resistance is 300 N. What is the acceleration of the sky diver, five seconds after jumping?