21. A arctic tern was born in north pole. In autumn, it flys for about 20000 km to south pole, and then return back to north pole in next spring. Using the Earth as reference frame. If the artic tern spent 60 days for its first trip from north pole to south pole, what is the averaged velocity during this 60 days? (Assume earth radius 6400 km)

According to Lunar Laser Ranging experiment the average distance LM from the Earth to the Moon is approximately 3.91 x 105 km. The Moon orbits the Earth and completes one revolution relative to the stars in approximately 27.5 days (a sidereal month). Calculate the orbital velocity of the Moon in m/s. Answer: Choose...

A toy racecar races along a circular race track that has a radius of 26 meters. The racecar starts at the 3-o'clock position of the track and travels in the CCW direction. Suppose the car has swept out 2.05 radians since it started moving. The racecar is how many radius lengths to the right of the center of the race track?  radius lengths    The racecar is how many meters to the right of the center of the race track?  meters    The racecar is how many radius lengths above the center of the race track?  radius lengths    The racecar is how many meters above the center of the race track?

Read the question carefully and give me right solution according to the question. A particle travels around a circular path having a radius of 40 m. If it is initially traveling with a speed of 10 m/s and its speed then increases at a rate of (0.05 v) m/s 2, determine the magnitude of the particle’s acceleration at t = 3 s. Round your answer to 2 decimal places.

how do i solve this problem

Consider the Earth's orbit around the Sun to be circular with radius R = 9.30 x 107 mi and it takes 365 days to complete one revolution. What is the distance Earth traveled for one revolution (circumference of a circle is 2??2πR )?

B) what is the period of the orbit, in hours?

According to Lunar Laser Ranging experiment the average distance LM from the Earth to the Moon is approximately 3.92 x 105 km. The Moon orbits the Earth and completes one revolution relative to the stars in approximately 27.5 days (a sidereal month). Calculate the orbital velocity of the Moon in m/s. Answer: Choose...

According to Lunar Laser Ranging experiments the average distance LM from the Earth to the Moon is approximately 3.85 × 10° km. The Moon orbits the Earth and completes one revolution in approximately 27.5 days (a sidereal month). Select the correct expression to calculate the velocity of the Moon. Select one: L'M O a. UM 2nLM O b. UM Тм O c. UM LM Тм 2nLM TM O d. UM

010: A new planet (tentatively named "Melmac") is found in a circular orbit with a period of 571 years. The sun has a mass of 1.9891x1030 kg. How far away is the planet in Astronomical Units (AU) ? Note: An A.U. is 1.496x1011 m.