Gravitation

Questions & Answers

(a) Choose relationship between the gravitational potential energy, Ep and the gravitational potential, V for a body of mass m placed in a gravitational field. and the mass of the Earth = 5.98 × 1024 kg. Find the radius of orbit A and of B from the centre of the Earth. RA = - RB = (c) Calculate the centripetal acceleration of a satellite in orbit


What is the gravitational field strength at a height of 2 x107m above the surface of the Earth? The radius of the Earth is 6.4 x 106 m and the value of g on the Earth's surface is 9.8 ms-2.


What is the angular speed of a satellite in a geostationary orbit around the Earth? *(1 Point) 1.2 \times 10^{-5} \mathrm{rad} s^{-1} 4.2 \times 10^{-3} \mathrm{rad} s^{-1} 7.3 \times 10^{-5} \mathrm{rad} s^{-1} 2.6 \times 10^{-1} \mathrm{rad} s^{-1}


Let's recap what we've been learned from the previous tutorials: Use the information from the video to answer these questions: 1A) What is the period of a Cepheid star used to directly determine? 1B) How do the light spectra from far away stars compare to our expected spectra? 1C) Which is true about the red shift seen in the light from far away stars?


An oscillator is forced to oscillate at different frequencies. The graph of amplitude A against the driving frequency f for this oscillator is shown. The damping on the oscillator is now DECREASED. Which of the following statements is/arecorrect? 1. The amplitude of the oscillations at any frequency decreases. 2. The maximum amplitude occurs at a lower frequency. 3. The peak on the graph becomes thinner. * O Statement 1 is only correct O Statement 3 is only correct O All three statements are correct. Statement 2 is only correct


Two ideal gases have the same mass density and the sameabsolute pressure. One of the gases is helium (He), and its tem-perature is 166 K. The other gas is neon (Ne). towhere the molar mass of helium and neon are given byMHe = 4.0026 kg mol- and MNeth= 20.179kgmol-1 What is the temperature of the neon?


1. (1 point) Calculate the wavelength of an electron travellingwith speed 0.28 c where 6.63 × 10–34 h= 6.63 × 10-34 Js c = 3 × 10° ms-l mẹ = 9.1 × 10¬31 kg


The acceleration due to gravity at the north pole of Jupiteris 25 ms-2. Jupiter has a mass 1.9 x 1027 kg and radius7.1 x 107 m. (a) What is the gravitational force on a 5 kg object placed atthe north pole of Jupiter? (b) If the apparent weight of this mass placed at the equator(ie the push of the ground on this mass) is 113 N, calculate thelength of Jupiter's day. Assume Jupiter is spherical. (c) Calculate a value for G.


The temperature near the surface of the earth is 291 K. Anargon atom (atomic mass = 39.948 u) has a kinetic energy equalto the average translational energy and is moving straight up. Ifthe atom does not collide with any other atoms or molecules,how high up would it go before coming to rest? Assume that the acceleration due to gravity is constant throughout the ascent.h =.


Which of the following are two explanations scientists use to explain the redshift seen in light from far away stars? Explanation 1 Explanation 2


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