Q: Answer the following question given this paragraph: Thermal energy can be trapped in Earth's atmosphere by gases such as CO2, water vapor, methane, and chlorofluorocarbons before it can be radiated into spacelike the effect of a greenhouse. It is not yet clear how large an increase in the temperature of Earth's surface can be attributed to this phenomenon. Venus is an example of a planet that has a runaway greenhouse effect. The atmosphere of Venus is about 95 times denser than that of Earth and contains about 95% CO2. Because Venus is closer to the sun, it also receives more solar radiation than Earth does. The result of increased solar radiation and high CO2 levels is an average surface temperature of about 450C, which is hot enough to melt lead. Data such as those in Figure 5.22 "Changes in Atmospheric CO" indicate that atmospheric levels of greenhouse gases have increased dramatically over the past 100 years, and it seems clear that the heavy use of fossil fuels by industry is largely responsible. It is not clear, however, how large an increase in temperature (global warming) may result from a continued increase in the levels of these gases. Estimates of the effects of doubling the preindustrial levels of CO2 range from a 0C to a 4.5C increase in the average temperature of Earth's surface, which is currently about. Q: Gases such as co2 and methane can trap what energy in earth's atmosphere, before radiating it into space? A:

OPTIONS:
- mechanical energy
- sunlight energy
- potential energy
- thermal energy

A: thermal energy

input: OPTIONS:
- ending
- middle
- concurrent
- beginning Now, answer this question: Answer the following question given this paragraph: Reactant concentrations are highest at the beginning of a reaction. The plot of [C] versus tis a curve with a slope that becomes steadily less positive. Q: Reactant concentrations are highest at which part of a reaction? A:
A:
output: beginning

Answer the following question given this paragraph: Discussion for (a) This value is the net work done on the package. The person actually does more work than this, because friction opposes the motion. Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. Strategy and Concept for (b) The forces acting on the package are gravity, the normal force, the force of friction, and the applied force. The normal force and force of gravity are each perpendicular to the displacement, and therefore do no work. Solution for (b) The applied force does work. Q: Friction does negative work and removes some of the energy the person expends and converts it to which kind of energy? A:

OPTIONS:
- erosion
- hydro
- evaporation
- thermal

Answer: thermal

Problem: OPTIONS:
- temperature
- pressure
- wavelength
- direction
Q: Answer the following question given this paragraph: Acceleration is a vector, and thus has a both a magnitude and direction. Acceleration can be caused by either a change in the magnitude or the direction of the velocity. Instantaneous acceleration a is the acceleration at a specific instant in time. Deceleration is an acceleration with a direction opposite to that of the velocity. Q: Acceleration is a vector, and thus has a both a magnitude and what else? A:
Answer: direction

Problem:OPTIONS:
- mature
- immature
- stable
- unstable

Answer the following question given this paragraph: Different radioisotopes may vary greatly in their rate of decay. The more unstable their nuclei are, the faster they decay. Q: Radioisotopes may vary greatly in their rate of decay, decaying faster if their nuclei are more what? A:
****
A: unstable

Problem:OPTIONS:
- reflective point
- boundary point
- periodic point
- focal point

Answer the following question given this paragraph: Some mirrors have a curved rather than flat surface. Curved mirrors can be concave or convex. A concave mirror is shaped like the inside of a bowl. This type of mirror forms either real or virtual images, depending on where the object is placed relative to the focal point. The focal point is the point in front of the mirror where the reflected rays intersect. You can see how concave mirrors form images in Figure below and in the interactive animation at the URL below. The animation allows you to move an object to see how its position affects the image. Concave mirrors are used behind car headlights. They focus the light and make it brighter. They are also used in some telescopes. Q: The point in front of a mirror where the reflected rays intersect is known as what? A:
****
A:
focal point