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Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A.Helium has no mass, but air does. B.Helium increases the balloon’s mass more than air. C.Helium has a higher density than air. D.Helium has a lower density than air.

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In a energy transformation, the total amount of energy is “increased” True or false?

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If heat is transferred away from a gas, which could happen? A) The gas may explode. B) The gas may become a liquid as it loses energy. C) The heat capacity of the gas may increase.

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As 390-g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. How does the temperature of the milk change? (cmilk = 3.9 J/g°C) a) It increases by 77°C. b) It decreases by 77°C. c) It increases by 20°C. d) It decreases by 20°C.

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When an atom of beryllium-9 is bombarded by an alpha particle, an atom of carbon-12 is produced and a neutron is emitted. What kind of nuclear reaction just occurred?

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Batteries transform ______________ energy into mechanical energy. Which part of a circuit in a home is designed to be replaced if it stops a circuit overload? a circuit breaker an arc-fault circuit interrupter a fuse a ground-fault circuit interrupter A(n) ____________ force causes the leaves in an electroscope to separate according to the law of charges. A material that conducts under certain conditions but acts as a resistor under other conditions is known as a(n) ______________. Laser printers are one application of ______________ electricity.

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The approximate size of a galaxy can be measured by using the doppler effect. true or false.

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What is the mass of a sample whose specific heat is 6.28 J/g·°C if the sample absorbs 19.4 J and has a temperature increase of 22.9 °C? a)0.135 g b)0.324 g c)7.41 g d)70.7 g

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Which is occurring when work is being done? energy is being reverted. energy is being decreased. energy is being increased. energy is being transferred.?

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Which is a chemical property that can be used to identify calcium carbonate?

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A bowling ball has a mass of 6 kg. What happens to its momentum when its speed increases from 2 m/s to 4 m/s? A) The initial momentum is 6 kg*m/s, and the final momentum is 3 kg*m/s B) The initial momentum is 12 kg*m/s, and the final momentum is 24 kg*m/s C) The initial momentum is 12 kg*m/s, and the final momentum is 3 kg*m/s D) The inital momentum is 6 kg*m/s, and the final momentum is 12 kg*m/s

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A bowling ball has a mass of 5 kg. What happens to its momentum when its speed increases from 1 m/s to 2 m/s? A) The initial momentum is 5 kg”m/s, and the final momentum is 10 kg”m/s. B) The initial momentum is 5 kg”m/s, and the final momentum is 3″kg m/s. C) The initial momentum is 5 kg”m/s, and the final momentum is 7 kg”m/s. D) The initial momentum is 5 kg”m/s, and the final momentum is 20 kg”m/s. (I think this is Physics not sure)

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A bowling ball has a mass of 6 kg. What happens to its momentum when its speed increases from 2m/s to 4 m/s? A) The initial momentum is 6 kg m/s, and the final momentum is 3 kg m/s B) The initial momentum is 6 kg m/s, and the final momentum is 12 kg m/s C) The initial momentum is 12 kg m/s, and the final momentum is 24 kg m/s D) The initial momentum is 12 kg m/s, and the final momentum is 3 kg m/s

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ANSWER TRUE OR FALSE FOR EACH OF THESE. 1. Life forms have been discovered on other planets. 2. The most unusual characteristic of Uranus is axis tilted 98°. 3. The two heavenly bodies which were predicted to exist before they were sighted are Neptune and Pluto. 4. The three planets which have rings are Saturn, Neptune, Uranus. 5. The most abnormal thing about Pluto is its orbit. 6. Neptune’s discovery was predicted before it was actually discovered. 7. Mars has a very thin atmosphere of carbon dioxide. 8. Venus is covered with an atmosphere of dense clouds. 9. Pluto is always farther away from the sun than Neptune is. 10. Uranus is a pale green planet, with 27 satellites and several rings. 11. The asteroid belt may be the remains of a former planet. 12. Comets could possibly be millions of years old. 13. The existence of comets provides possible evidence for a young solar system. 14. Comets are made up of dust and frozen gas particles. 15. As the moon revolves around the Earth, eventually all of the moon’s surface can be seen. 16. The moon’s period of rotation and revolution are the same. 17. The moon revolves in the same direction as the Earth’s rotation. 18. The new moon can be seen in the night sky only. 19. Ocean tides are produced by a combination of the moon and sun’s gravity. 20. The largest tides occur at new moon, full moon, solar eclipse, & lunar eclipse. 21. Neap tides occur during the quarter moon phase 22. One of the first useful instruments used by astronomers to map the position of the stars was the astrolabe. 23. A telescope which has an eyepiece and large glass lens connected by a large body (tube) is called a refracting telescope. 24. A reflecting telescope uses a mirror to collect light from an object.

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Which of the following are early clues that signal an earthquake may occur? Select all that apply. Changes in magnetic properties of rock Movement of magma Decrease in well water levels Increase in sulfur dioxide and carbon dioxide ground emissions Increases in radon gas in groundwater Foreshocks

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A human hair is approximately 50 um in diameter. Express this in meters

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Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work? Move the machine to a different gravitational field. Increase the friction between its moving parts. Reduce the friction between its moving parts. Redefine the machine’s system boundaries.

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Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work? Move the machine to a different gravitational field. Increase the friction between its moving parts. Reduce the friction between its moving parts. Redefine the machine’s system boundaries.

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Pancake syrup taken out of the refrigerator will be difficult to pour because low temperature increases viscosity. a)True b)False

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Which isotope is appropriate for dating rocks that are billions of years old? carbon-12 carbon-14 uranium-238 oxygen-16

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Which type of energy increases as air expands?

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Iagara Falls is a set of very large waterfalls located on the border between New York and Ontario, Canada. Over 200,000 cubic feet of fast-moving water falls approximately 180 feet every second. Water at the top of the Falls possesses

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Exercising above your target heart rate zone may A increase change of injury B decrease lung capacity C increase hydration D decrease perspiration

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For a given input force , a ramp increases which of the following? A) height B) output force C) output work D) efficiency

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Explain why increasing the temperature of a gas in a closed, rigid container causes the pressure in the container to increase.

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If a step-up transformer has a primary coil with 15 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts? A. 8 turns B. 30 turns C. 80 turns D. 160 turns

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When a baseball player catches a baseball, the glove “gives” or moves backward. How does this movement affect the change in momentum of the baseball? The change in momentum increases because the impact time increases. The change in momentum decreases because the force decreases. The change in momentum stays the same because the ball still comes to a stop. The change in momentum depends on the initial speed of the ball and the time to stop.

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The mass of a moving object increases, but its speed stays the same. What happens to the kinetic energy of the object as a result? It decreases. It increases. It remains unchanged. It fluctuates up and down.

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The mass of a moving object increases, but its speed stays the same. What happens to the kinetic energy of the object as a result? It decreases. It increases. It remains unchanged. It fluctuates up and down.

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In a simple circuit, if you replace one resistor with a resistor of a higher value will the reading the ammeter increase, decrease or not change?

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