Part one: a gust of wind blows an apple from a tree.

as the apple falls, the force of gravity on the

apple is 9.39 n downward, and the force of

the wind on the apple is 1.50 n to the right.

what is the magnitude of the net external

force on the apple?

answer in units of n.

part two: what is the direction of the net external force

on the apple (measured from the downward

vertical, so that the angle to the right of

downward is positive)?

answer in units of ◦

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?

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?