A 0.4kg ball has a velocity of 18m/s Calculate the kinetic energy of the ball

How much work would be required to stop the ball

A 7kg bowling ball is brought to a height of 1.5m
What is the increase of potential energy

How much work was required to lift the box to this position?
If the ball is dropped, calculate the velocity of the ball just before it hits the ground

The staples inside a stapler are kept in place by a spring with a relaxed length of 0.115m. If the spring constant is 51.0N/m, how much elastic potential energy( E. P.E) is stored in the spring when its length is 0.150m?

A roller coaster car with a mass of 1200kg starts at rest from a point (A) 20m above the ground.
a) What is the Potential energy of the car at point A?

b) If friction can be ignored, what will be the kinetic energy of the roller coaster at the bottom of the hill?

c) How fast is the roller coaster moving as soon as it reaches the bottom of the hill?

d) How much work must be done to stop the roller coaster as soon as it reaches the bottom of the hill? ( Explain)

Player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. what is the horizontal velocity component of the ball to the nearest tenth of a m/s?

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.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?