Q: What is the measure of change in velocity of a moving object? Read this paragraph and choose the correct option from the provided answers: Acceleration is a measure of the change in velocity of a moving object. It shows how quickly velocity changes. Acceleration may reflect a change in speed, a change in direction, or both. Because acceleration includes both a size (speed) and direction, it is a vector. Choices: - transmission - vibration - kinetic energy - acceleration A:
acceleration

(Question)
Q: Friction causes the molecules on rubbing surfaces to move faster, which produces what? Read this paragraph and choose the correct option from the provided answers: You know that friction produces heat. That's why rubbing your hands together makes them warmer. But do you know why the rubbing produces heat? Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy. Heat from friction can be useful. It not only warms your hands. It also lets you light a match (see Figure below ). On the other hand, heat from friction can be a problem inside a car engine. It can cause the car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts and makes them slippery so there is less friction. Choices: - life - precipitation - cold - heat A:
(Answer)
heat

Ques: Q: What force increases a slide downhill and decreases a slide uphill? Read this paragraph and choose the correct option from the provided answers: Discussion As might have been expected, the player slides a shorter distance by sliding uphill. Note that the problem could also have been solved in terms of the forces directly and the work energy theorem, instead of using the potential energy. This method would have required combining the normal force and force of gravity vectors, which no longer cancel each other because they point in different directions, and friction, to find the net force. You could then use the net force and the net work to find the distance d that reduces the kinetic energy to zero. By applying conservation of energy and using the potential energy instead, we need only consider the gravitational potential energy. Choices: - nuclear - frictional - tension - gravity A:
Ans: gravity

(Q).
Q: Biomass, solar, wind, water, and geothermal power are examples of what kinds of energy resources? Read this paragraph and choose the correct option from the provided answers: Renewable energy resources include solar, water, wind, biomass, and geothermal power. These resources are usually replaced at the same rate that we use them. Scientists know that the Sun will continue to shine for billions of years. So we can use the solar energy without it ever running out. Water flows from high places to lower ones. Wind blows from areas of high pressure to areas of low pressure. We can use the flow of wind and water to generate power. We can count on wind and water to continue to flow! Burning wood ( Figure below ), is an example of biomass energy. Changing grains into biofuels is biomass energy. Biomass is renewable because we can plant new trees or crops to replace the ones we use. Geothermal energy uses water that was heated by hot rocks. There are always more hot rocks available to heat more water. Choices: - mechanical - electrical - fossil fuel - renewable A:
(A).
renewable

Ques:Q: When does a baby double in length and triple in weight? Read this paragraph and choose the correct option from the provided answers: Scientific notation is a way of writing very large or very small numbers that uses exponents. Numbers are written in the format a 10 b . Choices: - terrible twos - fetal stage - pre-adolescence - infancy A:

Ans:infancy

Ques:Q: Why does ice wedging occur? Read this paragraph and choose the correct option from the provided answers: Ice wedging happens because water expands as it goes from liquid to solid. When the temperature is warm, water works its way into cracks in rock. When the temperature cools below freezing, the water turns to ice and expands. The ice takes up more space. Over time, this wedges the rock apart. Ice wedging is very effective at weathering. You can find large piles of broken rock at the base of a slope. These rocks were broken up by ice wedging. Once loose, they tumbled down the slope. Choices: - water melts - water freezes - water evaporates - water expands A:

Ans:
water expands