Gravitation

4. (1 point) The work function of sodium has a value of3.776 x 10-19 I Calculate the energy (E) required in electron volts to remove an electron from the surface of sodium. Express you answer in terms of the standard SI units for the quantity.

A planet of mass M and radius R rotates so quickly that material at its equator only just remains on its surface. What is the period of rotation of the planet? 2 \pi \sqrt{\frac{R^{3}}{G M}} 2 \pi \sqrt{\frac{G M}{R}} 2 \pi \sqrt{\frac{R}{G M}} 2 \pi \sqrt{\frac{G M}{R^{3}}}

Consider an object that moves at a constant speed, v, in a perfect circle, of radius r. Which one of the following statements is correct * The resultant force on the object equals zero O The rate of change of velocity is negative O The object experiences a resultant force outwards None of these statements are correct

The following are quantities associated with a body performing Simple Harmonic Motion: 1. The body's velocity 2. The accelerating force acting on the body 3. The acceleration of the body. Which of these quantities areexactly in phase with each other? All of these quantities O 1 and 2 only 1 and 3 only O 2 and 3 only O None of these quantities

t) Where \begin{array}{l} h=6.63 \times 10^{-34} \mathrm{Js} \\ m_{e}=9.1 \times 10^{-31} \mathrm{~kg} \\ e=1.6 \times 10^{-19} \mathrm{C}^{2} \\ g_{0}=8.85 \times 10^{-12} \mathrm{C}^{2} \mathrm{~N}^{-1} \mathrm{~m}^{-2} \end{array} a) Calculate the radius, r, of the Bohr orbit for an electron in-the fifth energy level of the Helium ion (He+). Express you answer in terms of the standard SI units for the quantity. If you don't get this in 2 tries, you can get a hint.

Near the surface of Venus, the r.m.s. speed of carbon dioxide molecules (CO2) is 659 m/s. What is the temperature (in kelvins)of the atmosphere at that point?

An object moves freely at 90° to the direction of a gravitational field. The acceleration of the object is * ) in the direction of the gravitational field. zero opposite to the direction of the gravitational field. O at 90° to the direction of the gravitational field.

The gravitational potential (V) as a function of distance, R, and the gravitational field, g as a function of distance R. * Which feature represents the magnitude of the gravitational field, g, at a point? O A O B Ос D

The diagram represents the gravitational field and potential for a planet-moon system. Which area in the graph shows the total gravitational field strength, g = 0 * DA В O D O None of the regions highlighted has g=0

The gravitational potential at a point in space is –1.1 x107 Jkg-1. A meteor moves through this position at a speedof 500 ms-1. Some time later the meteor passes through a newposition which has gravitational potential –4.3 × 107 Jkg-!. Calculate the speed of the meteor as it moves through the second point.%=