8107 N Activity 4:
A boy of mass 55 kg is travelling at 6m-s 'on a skateboard of mass 1 kg, when he reaches a
ramp of length 8m, he keeps moving and reaches the top of the ramp with velocity of 1 ms
The
constant friction that he experiences is 6 N.
8 m
4.1 Explain whether his mechanical energy is conserved or not
4.2. Calculate the kinetic energy of the boy when reaches the ramp.
4.3. Calculate the height of the ramp.​

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

What’s #16 asking and how do i solve it?