Explain why a centripetal force doesnot do work on a circularly moving objects?

A planet orbits its star in an elliptical orbit. Which of these quantities do not change as the planet orbits? O None of these quantities change as the planet orbits. O All of these quantities change as the planet orbits. O The planet's angular momentum O The planet's potential energy O The planet's kinetic energy

A rotating space station consisting of a ring of radius 40m provides the same gravity as earth. What is the kinetic energy of a stationary 10kg object on the space station express answers in joules

A satelite is in geostationary orbit. How much energy is required to move it to a circularorbit where it orbits the Earth once in 8 days? You may express your answer in terms ofthe total energy of the initial geostationary orbit.

lo completes one orbit about Jupiter in 1.77 days and the average Jupiter-Io distance is 4.22 x 10° m. Calculate the angular speed w of Io as it orbits Jupiter. W =

12. A child and her father are playing on a spinning merry-go-round (a solid, horizontal disk). The disk is rotating at 0.400 rad/s. The disk as a mass of 200 kg and a radius of 5.00 m. The daughter (1) has a mass of 25.0 kg and is 3.00- m from the center of the disk. The father (2) has a mass of 60.0 kg and is 2.00-m from the center of the disk. a) The father moves to the outer edge of the disk, while the daughter moves inward until she is 1.00 m from the center. What is the new angular speed of the disk?

28.  An elliptical orbit can be analyzed using conservation of angular momentum and mechanical energy.  The distance between Earth, mass 5.972 × 1024 kg, and Sun, mass 1.989 × 1030 kg, varies from 147 to 152 Gm.  (a) Use the formula UG = – Gm1m2/r to find the change in potential energy that occurs moving from the farthest distance to the nearest.  (b) Given that the speed of Earth at its farthest point is 29.29 km/s, use conservation of energy to find its speed at the nearest point.  (c) Calculate the angular momentum of Earth at each extreme and show that it is equal.29.  Use concepts from the previous problem to find the speed of Pluto at each extreme of its orbit about the Sun – distance varying from 4.44  × 1012 m to 7.38 × 1012 m.  Hint:  use a system of equations based on conservation of energy and angular momentum. P.S. I already solved 28 but I don't know how to do 29.

What’s the linear speed of a point on the equator of a planet whose radius is 2.3 times that of Earth?

A ezto.mheducation.com/ext/map/index.html?_con3con&external_browser%3D0&launchUrl=https%253A%252F%252Fnewconnect.mheducation.com%252F.. 18 i Saved Help Save 5 How much work is done by the motor in a CD player to make a CD spin, starting from rest? The CD has a diameter of 12.0 cm and a mass of 15.8 g. The laser scans at a constant tangential velocity of 1.20 m/s. Assume that the music is first detected at a radius of 20.0 mm from the center of the disk. Ignore the small circular hole at the CD's center. Вook Hint Int ences < Prey 5 of 21

A 35.0 kg child is on a swing following a circular path with a radius of 3.25 m. As the swing passes through the lowest point of the circular path, the seat exerts a force of 480 N [up] on the child, what is the speed of the swing at that point?