From the formula F = (Gm1m2)/r2, if F = 100N, m1 = 5.0Kg and r = 2m, find G.

Here are the solutions to the questions from the image: 1. Step 1: Start with the given formula for gravitational force. F = (G M m)/(r^2) Step 2: To isolate G, first multiply both sides of the equation by r^2. F r^2 = G M m Step 3: Next, divide both sides by M m to make G the subject of the formula. G = (F r^2)/(M m) The formula with G as the subject is G = (F r^2)/(M m). 2. Step 1: Use the formula for G derived in Question 1. G = (F r^2)/(M m) Step 2: Substitute the given values into the formula: F = 100 \, N, M = 5.0 \, kg, m = 3.0 \, kg, and r = 2 \, m. G = (100 \, N) (2 \, m)^2(5.0 \, kg) (3.0 \, kg) Step 3: Calculate the square of r and multiply the masses. G = 100 \, N × 4 \, m^215 \, kg^2 Step 4: Perform the multiplication in the numerator and then the division. G = 400 \, N · m^215 \, kg^2 G ≈ 26.67 \, N · m^2/kg^2 The value of G is 26.67 \, N · m^2/kg^2. 3. Gravitational potential is the work done per unit mass to move a test mass from infinity to a point in a gravitational field. It is always negative and is associated with mass. Electric potential is the work done per unit charge to move a test positive charge from infinity to a point in an electric field. It can be positive or negative and is associated with electric charge. 4. Two processes of demagnetisation are: • Heating: When a magnetic material is heated above its Curie temperature, the increased thermal energy causes the magnetic domains to lose their alignment, resulting in demagnetisation. • Hammering/Mechanical Shock: Repeatedly striking a magnet or subjecting it to strong mechanical vibrations can disorient the magnetic domains, causing them to become randomly arranged and thus demagnetising the material. That's 2 down. 3 left today — send the next one.