The concept of escape velocity can be best described as: (A) The initial speed required so that an object will safely orbit the Earth. (B) The speed for an object to be launched and fly through space forever. (C) The speed necessary for a spacecraft to escape Earth's atmosphere. (D) The velocity needed to provide an initial kinetic energy such that total mechanical energy is zero.

A 0.23-kg stone is held 1.1 m above the top edge of a water well and then dropped into it. The well has a depth of 4.6 m. (a) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system before the stone is released? (b) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system when it reaches the bottom of the well? (c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well?

A car accelerates from rest to 14 m/s in 5 seconds on a horizontal road under perfect conditions. If the mass of the car is 850 kg, approximately how much power must be supplied to the wheels of the car to obtain this acceleration?

In a futuristic scenario, you are assigned the mission of making an enemy satellite that is in a circular orbit around Earth inoperative. You know you cannot destroy the satellite, as it is well protected against attack, but you can try to knock it out of its orbit so it will fly away and never return. What is the minimum amount of work ?W applied to the satellite that is required to accomplish that? The satellite's mass and altitude are 969 kg969 kg and 241 km.241 km. Earth's mass and radius are 5.98×1024 kg5.98×1024 kg and 6370 km.

A 4.0 kg object is raised 7 meters above the ground (on the earth).  How high would the object have to be raised above the surface of the moon (g = 1.6 N/kg) to have the same amount of potential energy.  Use gEhE=gMhM

A couple of soccer balls of equal mass are kicked off the ground at the same speed but at different angles. Soccer ball A is kicked off at an angle slightly above the horizontal, whereas ball B is kicked slightly below the vertical. How do each of the following compare for ball A and ball B? (a) The initial kinetic energy and (b) the change in gravitational potential energy from the ground to the highest point? If the energy in part (a) differs from part (b), explain why there is a difference between the two energies.

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An object with a mass of m = 2.25 kg is traveling with an initial velocity of v, = (5.40î – 1.40j) m/s. (a) Determine its initial kinetic energy. (Give your answer to at least one decimal place.) (b) Determine the amount of work that must be done on the object in order to change its velocity to v; = (7.00oî + 7.00j) m/s.

You have an object of mass 30.6 kg. If it is moving at a speed of 7.1 m/s and is a distance of 4.3 m above the ground, what is the total energy of the object, in Joules? (Use the ground as your zero for gravitational potential energy.) Your Answer: Answer

This golfer has been known to tell some extraordinary stories. Explain if each situation is possible using conservation of energy. Assume friction/air resistance ARE present. They hit a ball in a completely flat field, and the ball followed a parabolic trajectory (like in projectile motion). They measured the ball speed at takeoff to be 91m/s. When the ball landed 145m away, they measured their ball speed on landing to be 94m/s.  They hit the ball along the ground. When the ball left the club, it was moving at 2m/s. When the ball went in the hole, it was moving at only 0.9m/s. The golfer claims that hitting the ball with a club that is four times as massive at the same speed makes the ball go two times faster off the tee. Note: Please solve the subparts