Physics

A tightly sealed house has a large ceiling fan that blows air out of the house and into the attic. The owners turn the fan on and forget to open any windows or doors. What happens to the air pressure in the house after the fan has been on for a while, and does it become easier or harder for the fan to do its job
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1. The law of reflection states that the angle of _______ is equal to the angle ofreflectionrefraction incidence
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What is activated by the sympathetic system?1. The digestive system2. The "rest and digest" response3. O The "fight or flight" response4. The "breed and feed" response
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Use what you know about mass and how you use it to calculate force in the following situation. If each washer has a mass of 4. 9 g, then the mass of two washers in kilograms would be. Given that F = ma, and if 4 washers are attached to the string and car instead of 2, then the applied force on the car will be. Recall a = 10 m/s2.
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37. The progressive loss of material from a surface by the mechanical action of a fluid on a surface is called
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What is the speed of sound through air?200 meters per second335 meters per second400 meters per second600 meters per second
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the acceleration of a train moving from rest and its speed reaches 36m/sec in 9 sec
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What is the anomalous expansivity of water
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Draw the graphs for exothermic and endothermic reactions Label: axes, reactants, products, Energy of reaction, heat energy change
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when plate movement rocks to break its called
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is atmosphere pressure at high altitudes is less than the pressure at ground, true or false
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Which statement explains the first law of thermodynamics?.
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The Sun has a mass of 1.99 x 10^30kg [^30 is an exponent] and is 1.5 x 10^11m [^11 is an exponent] from the earth. The planet Earth is 5.98 x 10^24kg [^24 is an exponent]. What is the gravitational attraction between the sun and the earth? G=6.6710^-11 (-11 is an exponent)
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The motor of an electric drill has a power input of 1200 W. How much work 3 pointsis done by the drill in a time of 2 minutes? *Your answerThis is a required question
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As a satellite is accelerated away from the Earth by a rocket, the satellite's mass increasesremains the samedecreases
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What type of heat transfer is most important to maintaining a relatively stableclimate on Earth? Justify your answer.
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You slide towards the window when a car makes a sudden turn
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Is this right for the second one
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Which of these do not affect fluid friction?The surface of an objectThe viscosity (thickness) of fluid an object is inThe shape of an objectThe weight of an object
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What are some of the dangers that volcanoes pose to human populations? a. Destruction of property from lava flow b. Destruction from mud flows c. Lung problems from ash and toxic gases d. All of the above.
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A volleyball that has an initial momentum of 1.0kgms1.0kg sm minus, 1, point, 0, start text, k, g, end text, dot, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction changes direction after a hand hits it with a force of 150N150N150, start text, N, end text for 0.01seconds0.01seconds0, point, 01, start text, s, e, c, o, n, d, s, end text.A hand hits a volleyball. An arrow points to the right, in the directio
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9. When a balloon rises into the air, itA. Expands on coolingB. Contracts on coolingC Expands on heatingD. Contracts on heating
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