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a 54 newton horizontal force pushes a 5.0 kg mass sitting on a horizontal surface. Additionally , the horizontal surface exerts a 30 newton frictional force on the mass. What is the acceleration of the mass?

  • An isolated macroscopic system at temperature 300K absorbs a photon from the visible part of spectrum (say Wavelength=500nm) obtain a value for the relative increase ∆w/w in The number of accessible states of the system ?
how much heat must be added to a system at 298K for the number of accessible states to increase by a factor of 10^6?
Carbon dioxide initially at 50 kPa, 400 K, undergoes a process in a closed system until its pressure and temperature are 2 MPa and 800 K, respectively. Assuming an ideal gas behaviour, find the entropy change of the carbon dioxide by assuming that the specific heats are constant. For the gas, take Cp = 0.846 kJ/kg.K and R = 0.1889 kJ/kg.K
Task 1

Estimate how much pressure you exert on the ground when standing up. Carefully account for the measurement data that you use when solving the problem

Heat flows through a wooden board 30mm thick at 0.0086 W/cm² when one of it's sides is 20°C warmer than the other. Determine the thermal conductivity of the wood.​

What quantity is carried by sound waves from their source to the point where they eventually get absorbed?

A mass of ideal gas of volume 400 cm3 at a temperature of 27 ˚C expands adiabatically until its volume is 500 cm3. Calculate the new temperature. The gas is then compressed isothermally until its pressure returns to the original value. Calculate the final volume of the gas. Assume γ = 1.40.
A water vapour thermometer is calibrated at the ice and steam points and the saturation
vapour pressures (s.v.p) are measured. The saturation vapour pressure Pθ is given by
Pθ =P0(1+αθ+βθ^2) , where P0 is the s.v.p at the ice point, θ is the temperature in ˚C on
the Celsius scale, α and β are constants and α = 40 β ˚C. Determine the temperature of a
medium on the water vapour scale if its temperature on the Celsius scale is 50 ˚C.
Neglecting the effect of any resistance forces, use the diagram below to answer the following question. Explain your answers in 1-2 sentences.

(a) As the ball moves from point A to point D across the surface, does the sum of its gravitational potential and kinetic energies decrease, increase, or remain the same?

(b) At which point will the ball have the minimum gravitational potential energy?

(c) At which point will the ball’s kinetic energy be greater than its kinetic energy at point C?
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