Calorimetry: A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?

A. 34°C
B. 36°C
C. 38°C
D. 40°C


Answer: A

Physics & Space Science

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What is the source of the large dust shells seen around some red giants and red supergiants?

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A guarded hot plate test results in the following data:


Estimate the thermal conductivity of the test material.

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When a rock is held above the ground, we say it has some gravitational potential energy. When we let it go, it falls and we say the gravitational potential energy is converted to kinetic energy. Finally, the rock hits the ground (and stays there). What has happened to the energy?

A) The rock keeps the energy inside it in the form of mass-energy. B) The energy goes into the ground and, as a result, the orbit of Earth about the Sun is slightly changed. C) It is transformed back into gravitational potential energy. D) The energy goes to producing sound and to heating the ground, rock, and surrounding air.

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How large a pressure increase (in atm) must be applied to water if it is to be compressed in volume by 1.0%? The bulk modulus of water is 2.0 × 109 N/m2 and 1 atm = 1.0 × 105 N/m2.

A. 50 atm B. 100 atm C. 1 100 atm D. 400 atm E. 200 atm

Physics & Space Science