4 po 2. The specific heat capacity of Aluminium is 880J/Kg. C, calculate the
amount of energy required to increase the temperature by 40.C of an
aluminium block of mass a. 250g b. 1.5Kg [4]

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

more than, less

less than, more

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards