Planet-X has a mass of 3.42×1024 kg and a radius of 8450 km. What is the First Cosmic Speed i. e. the speed of a satellite on a low lying circular orbit around this planet? (Planet-X doesn't have any atmosphere.) Submit Answer Tries 0/12 What is the Second Cosmic Speed i. e. the minimum speed required for a satellite in order to break free permanently from the planet? Submit Answer Tries 0/12 If the period of rotation of the planet is 17.1 hours, then what is the radius of the synchronous orbit of a satellite?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s