ВОПРОСЫ
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1) Каков физический смысл плотности вещества?
2) Что принято за единицу плотности в СИ ( СИ-Международная система физических велечин)

как найти время,если известны: масса сила расстояние коэффициент трения

Помогите задать Косвенную речь. 
1. I watch 2 or 3 hours of television a day. 
2. At weekends I watch 4 and even more hours of television. 
3. If there is nothing good on I'll sit down and wait. I won't turn off the TV. 
4. I always leave the TV on even if I am doing my homework. 
5. I always turn on the TV when I come home. 
6. Yesterday I didn't watch TV at all. I had a lot of homework to do. 
7. I have already looked through a TV guide to plan what to watch. 
8. I won't turn the TV off if guests come. 
9. I am not a couch potato* but I like watching TV. 
10. I have never thought that watching too much TV is bad for my health.