An object of mass m is at rest on a rough inclined plane with height h, length 8 m, and which makes an angle of 30° with the horizontal. the object is allowed to move and it stops on a rough horizontal surface, at a distance of 2 m from the bottom of the inclined plane. the coefficient of kinetic friction on the inclined plane is 0.4 and g = 10 m/s2. what is the coefficient of kinetic friction for the horizontal surface?

Explanation:

given,

height of the inclined plane = h

length of the inclined plane = 8 m

angle made with  the horizontal= 30°

stopped in the rough horizontal surface = 2 m

kinetic friction coefficient = 0.4

acceleration due to gravity = 10 m/s²

coefficient of kinetic friction on horizontal surface = ?

using energy conservation

v = 4.91 m/s

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

multiply 2kg by latent heat of vap