Suppose the Sun's gravity were switched off. The planets would leave their orbits and fly away in straight lines as described by Newton's first law. (Assume the mass of the sun is 1.99 1030 kg, the orbital radius of Jupiter is 7.78 1011 m, and the orbital radius of Neptune is 4.50 1012 m.) (a) Would Jupiter ever be farther from the Sun than Neptune

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

What can you increase the strength of an electromagnet by

Convection occurs when thermal energy is transferred by the movement of