Field Theory Answers

The diagram below shows a man is trying to pull a box a distance of 3 m with a force of 20 N that makes a 35º with the horizontal. Apply your scientific knowledge and understanding of work to find the work done on the box.                             

On day with no wind, a large is dropped from a tall buildingThe object experience air resistance during its fall to the ground. State and explain,in terms of the forces acting, how the object varies during its fall

two ball are dropped from the same height neglible air resistance and if in the one ball a horizontal accelaraion is applied which ball will touch the ground first

Find the gradient vector and its modulus of scalar function (x,y,z) = x⁶y⁴z⁰-z³yx³-89 at (3,-2,1)

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