Question

You plan on using a 5000-kg-crane to vertically lift a very heavy mass (m), as shown in the figure. Assume the horizontal location of the crane’s center of mass is halfway between the front and rear bumper of the crane. (a) What is the largest mass that can safely be lifted without the crane tipping over? (b) If the maximum mass is lifted vertically, what is the maximum height it can be lifted without tipping the crane over?

Xcom for, crane iN

Answer 1

Electrostatic force b/w two point charge's is given by F = k q_1 q_2/r^2 r = 1.41 cm rightwardsdoublearrow 1.41 times 10^-2 m q_1 = q_2 = -2.99 times 10^-16 C (a) F = (9 times 10^9) (2.99 times 10^-16)^2/(1.41 times 10^-2)^2 rightwardsdoublearrow F = 4.047 times 10^-18 Newton (b) q = n e rightwardsdoublearrow -2.99 times 10^-6 n (-1.6 times 10^19) rightwardsdoublearrow n = 1868.75 rightwardsdoublearrow n = 1869 electrons