An object of known mass m with speed v0 travels toward a wall. the object collides with it and bounces away from the wall in the opposite direction in which the object was initially traveling. the wall exerts an average force f0 on the object during the collision. a student must use the equation δp⃗ =f⃗ δt to determine the change in momentum of the object from immediately before the collision to immediately after the collision. which side of the equation could the student use to determine the change of the object's momentum?

δp⃗ , because the mass of the object and the initial speed of the object are known.

a

f⃗ δt, because the average force exerted on the object during the collision is known.

b

either side of the equation may be used because the mass of the object, the initial speed of the object, and the average force exerted on the object during the collision are known.

c

neither side of the equation may be used because there are too many unknown quantities before, during, and after the collision.

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

What is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. wind turbines can kill birds that fly through the rotors. wind turbines are built too close to major population centers. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.