A model of a pure substance consists of 20% bolts, 40% washers, and 40% nuts. Another model of a mixture contains the same percentages of the same parts. Explain what type of sketch you would use to show each model.

Select the correct answer. what does the process of natural selection involve?

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.