A student wishes to measure the speed of a toy car at the bottom of an inclined plane. Which information is needed to calculate speed? a) the mass of the car and the height of the inclined plane b) the friction of the surface of the inclined plane and the mass of the car c) the length of the inclined plane and the time for the car to descend the inclined planed) the length of the car and the time for the car to descend the inclined plane
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c) the length of the inclined plane and the time for the car to descend the inclined plane.

Explanation:

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.