Alien scientists discover an asteroid headed directly towards their planet. The alien planet has a mass of M=6.39x1023 kg and the asteroid has a mass of m=1.50x108 kg. When the asteroid is a distance r1=3.40x108 m from the center of the alien planet, it has a velocity v1=1.00 m/s. The alien scientists calculate it will hit the surface of the planet with velocity v0=4982.00 m/s. What is the radius of the alien planet?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell