Assume 40% of the input electricity power is wasted as heat in an incandescent light bulb. (This value is higher in real life, but we will use this estimate.)
1. If you have 10 incandescent bulbs in your apartment, calculate the energy wasted as heat per week. (Each bulb is 75 W (J/s), and your lighting duration is 6 hours per day.)

45360 kJ

Explanation:

We can calculate energy by multiplying the power by time:

E = P * t

Each bulb has a power rating of 75W.

In 6 hours (3600 seconds) of each day, the energy exerted by each bulb will be:

E = 75 * 6 * 3600 = 1620000J

10 bulbs will therefore exert:

10 * 1620000 J = 16200 kJ

In a week, the energy exerted will be:

16200000 * 7 = 113400 kJ

Since 40% of this energy is wasted as heat, therefore, the amount of energy wasted as heat is:

40/100 * 113400000 = 45360000 = 45360 kJ

cancer risk hope this

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.