Modelová Otázka ID 3217 - 
Těleso o objemu 50 ml a hmotnosti 15 g v nádobě vyplněné 2 litry vody (ρ = 1 000 kg/m3) stoupá k hladině rovnoměrným přímočarým pohybem při rychlosti 10 cm/s. Jak velká síla působí na těleso proti směru jeho pohybu?
Správná odpověď je: B
Na těleso v kapalině a v tíhovém poli za všech okolností musí působit tíhová síla 
a vztlaková síla 
, kde ρ je hustota kapaliny vytlačovaná tělesem. Proti pohybu tělesa směrem k hladině působí tíhová síla o velikosti:
FG = g · m = 0,015 kg · 10 m · s−2 = 0,15 N.
| Cookie | Délka | Popis |
|---|---|---|
| _fbp | 3 months | Facebook sets this cookie to display advertisements when either on Facebook or on a digital platform powered by Facebook advertising after visiting the website. |
| _ga | 1 year 1 month 4 days | Google Analytics sets this cookie to calculate visitor, session and campaign data and track site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognise unique visitors. |
| _ga_* | 1 year 1 month 4 days | Google Analytics sets this cookie to store and count page views. |
| sbjs_current | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_current_add | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_first | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_first_add | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_migrations | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_session | 1 hour | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_udata | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| Cookie | Délka | Popis |
|---|---|---|
| lp_session_guest | 2 days | Description is currently not available. |
| uloha_switch | 1 day | Description is currently not available. |
