Now it's your turn 1 The speed of an electron in orbit about the nucleus of a hydrogen atom is
2.2 x 106m 5-1. It takes 1.5 x 10-16s for the electron to complete one orbit. Calculate
the radius of the orbit.

if they have a finite resultant

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

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

use photo math tells u all the answers thats what i use