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- 7Using the above equation and what you know about kinetic energy and energy conservation, show that the expression for the escape velocity ve from a planet of radius R is . (Hint: To just escape the planet, the object’s speed must be 0 infinitely far from the planet.) and find the escape velocity of an object being launched from Earth. Earth has a radius of and a mass of .4. Find the escape speed of a projectile from the surface of Jupiter.
- A satellite of mass 243kg orbits the Earth at a constant speed in a circular orbit. The work done by the Earth on the satellite is a. negative. b. zero. c.directed towards the centre of the orbit. d. [None of the others.] e. positive. f.directed along a tangent to the orbit.need help on this question.1) How does the acceleration due to gravity at the surface of a planet change if the planet's radius is doubled ?
- 14.) A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? Express your answer to two significant figures and include the appropriate units. gplanet= ____________ ______________ 15.) A 1400-NN crate rests on the floor. a.) How much work is required to move it at constant speed 5.0 mm along the floor against a friction force of 330 NN . Express your answer to two significant figures and include the appropriate units. Wp= ____________ _____________ b.) How much work is required to move it at constant speed 5.0 mm vertically. Express your answer to two significant figures and include the appropriate units. Wp= _____________ ______________Q19 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 launcned 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.4. To calculate the energy necessary to move from one situation to another we compare the total energy in each. How much work must be done by a rocket engine to transfer a 1000 kg satellite from an orbit of radius 2R, to 3R,?