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Solve for the net intensity at point A.
q1 9 m A 2 m q2
I
. _______________________________O__________________________.
-5 µC + 3 µC
a plane lands at a speed of 68 m/s and slows down at a rate 0f 4 m/s^2. How much runway is needed to stop the plane?
Explain the field theory.
Draw gravitational field lines to represent Jupiter’s gravitational field.
(b)Jupiter has a radius of 7.14 x 107m and the gravitational field strength at its surface is 24.9N/kg.
(i)Show that the mass of Jupiter is about 2 x 1027 kg.
(ii) Calculate the average density of Jupiter.
What is the force on an object of 50 kg that is 80 m away from another object that is 150 kg?
An object is 300m from another object of mass 40kg and experiences a force of 50N. What is the mass of the first object?
The Earth’s orbit is of mean radius 1.50 x 1011 m and the Earth’s year is 365 days long.
(i)The mean radius of the orbit of Mercury is 5.97 x 1010 m. Calculate the length of Mercury’s year.
(ii) Neptune orbits the Sun once every 165 Earth year.
Calculate the ratio: distance from Sun to Neptune / distance from Sun to Earth
State in words, Newton’s law of Gravitation.
By considering the centripetal force which acts on a planet in a circular orbit, show that T2 is directly proportional to R3 , where T is the time taken for one orbit around the Sun and R is the radius of the orbit.
A planet has radius 3/2 that of the earth and a density of 1/3 that of the earth. If a man jumps 1.5m on the earth, the approximate height he might jump on the planet is?
Calculate the least kinetic energy which must be given to a mass of 2000kg at the earth's surface for the mass to reach a point distance Ro from the center of the earth. Ignore the effect of the earth's rotation.
A communication satellite occupies an orbit such that its period of revolution about the earth is
24hrs. Explain the significance of this period
