Thermodynamics — Physics STD 11 Science — Question

Ifa 1kg weight is hung from a light spring, it makes 4 oscillations in 1 second. If a 4 kg weight is hung from the same spring, how many oscillations will it make per second?

Which gas monatomic and diatomic, will have greater specific heat at room temperature?

A ferry boat loaded with rocks has to pass under a bridge. The maximum height of the rocks is slightly more than the height of the bridge so that the boat just fails to pass under the bridge. Should some of the rocks be removed or some more rocks be added?

A monkey of mass 40kg climbs on a rope (Fig.) which can stand a maximum tension of 600 N. In which of the following cases will the rope break: the monkey,

1. Climbs up with an acceleration of 6ms^-2.
2. Climbs down with an acceleration of 4ms^-2.
3. Climbs up with a uniform speed of 5ms^-1.
4. Falls down the rope nearly freely under gravity?

(Ignore the mass of the rope).

What is momentum and on which factors it depends?

Answer the following questions based on the P-T phase diagram of carbon dioxide

1. At what temperature and pressure can the solid, liquid and vapour phases of CO₂ co-exist in equilibrium ?
2. What is the effect of decrease of pressure on the fusion and boiling point of CO₂?
3. What are the critical temperature and pressure for CO₂? What is their significance?
4. Is CO₂ solid, liquid or gas at (a) –70 °C under 1 atm, (b) –60 °C under 10 atm, 15 °C under 56 atm?

Why can water in a metallic pot be boiled quickly if the bottom of the pot is made black and rough than highly polished?

A satellite revolves round the earth. Air pressure inside the satellite is maintained at 76cm of mercury. What will be the height of mercury column in a barometer tube 1m long placed in the satellite?

What are ductile materials?