Question

i need #5 please!

1. I have 250 g of tea at 90°C in a light foam cup. I have some ice cubes at O'C, each with a mass of 10 g. How many should I add to my tea to make it drinkable? Explain your assumptions 2. A thermos will keep hot things hot or cold things cold by preventing the transfer of heat Explain how a thermos prevents each of the different kinds of heat transfer 3. I have 5.0 liters of air in a sealed container at a pressure of 120,000 Pa and 20*C How many air molecules are in my container? (Be careful of units here.) 4. If warm up the air in my container to 50°C, what will the new volume, pressure and number of particles be? 5. An isolated system has a momentum of 40 kg m's, an angular momentum of 12 kg m2's, and an energy of 150 J at time to. What is its angular momentum at timet 10s?

Answer 1

5) linear momentum = 40 kgm/s

angular momentum = 12 kgm^2/s

energy = 150 J [at t= 0 seconds]

now, since no external force is acting on the system, therefore torque and/or angular acceleration = 0

sing angular acceleration is 0 , it means there is no change in the angular velocity

thus, angular momentum remains conserved.

or in other words,

torque = rate of change of angular momentum

since there is no torque, means rate of change of angular momentum = o

thus , angular momentum remains constant.

Thus, angular momentum at t= 10 seconds = 12 kgm^2/s

Please ask your doubts or queries in the comment section below.