Molecular Physics | Thermodynamics Answers

A balloon is fitted over the open end of a glass beaker that contains water.

The beaker is placed over a flame, which heats the water. At the same time,

the balloon is squeezed, so that it deflates. What are the correct signs for the

heat and work changes to the beaker and balloon system?

O A. -Q.+w

O B. +Q,+W

O C. -Q,-W

O D. +0. -w

An ideal gas is placed in a 4L container at a temperature of 300K and a pressure of 6

atmospheres. The pressure is held constant while the volume of the gas is halved. What is the

new temperature of the gas?

A. 1200K

B. 600K

C. 300K

D. 150K

E. 75K

A closed gaseous system undergoes a reversible process during which 25 BTU are rejected, the volume changing from 5 ft3 to 2 ft3, and the pressure remains constant at 50 psia. Find the change of internal energy.

A heat pump is used for heating a building. It supplies 50,000 kJ/hr of heat to the building at 20°C. The outside air is at -5°C. Determine; a) the heat taken from outside air per hour, and b) the horsepower of motor required

consider a slab with L=25cm A=90cm² and the metal is copper .T_H=125^oc and T_c=10^oc and steady state is reached,find the conduction rate through the slab.

Work done by a substance in reversible nonflow manner in accordance with V=100/p3 ft3 where P in psi. Eavaluate the

work done on or by the substance as the pressure increases from 10 psia to 100 psia.

An ideal gas absorbs 5.00 × 10^3 J energy while doing 2.00 × 10^3 J of work on the environment during a constant pressure process (a) What is the change in the internal energy of the gas?

(b) If the internal energy now drops by 4.50 × 10^3 J and 2.00 × 10^3 J is expelled from the system, find the change in volume, assuming a constant pressure process at 1.01 × 10^5 Pa.

A motorcycle begins driving from at rest position. It accelerates at 8 km/hr2 for 20 seconds, then travels at a steady speed for another 20 seconds, all in the same direction. How much distance has it covered since it started driving?

A current of 0.2A passes through a 1.4kΩ resistor. What is the voltage across it?

Calculate the pressure exerted on a diver at 60 m below the free surface of the sea.

The barometric pressure is 101 kPa and the specific gravity of seawater is 1.03.