A cube of copper 2.00cm on a side is suspended by a string. The cube is heated with a burner from 20.0°C to 90.0°C. The air surrounding the cube is at atmospheric pressure (1.01×10^5Pa).

a. The increase in volume of the cube.
b. The mechanical work done by the cube to expand against the pressure of the surrounding air.
c. The amount of heat added to the cube.
d. The change in internal energy of the cube.

a. 2.856 x 10^-6 m³

b. 0.288 J

c. 971.88 J

d. 971.592 J

Explanation:

d) The change in internal energy of the cube.

Note: For Copper -

B(beta)= 5.1 × 10^-3 (C)^-1

Cp = 390J/Kg.K

p (Rho) = 8.90 × 10³Kg/m³

Detailed solution is attached below

battery with hi vtge high val resist in series

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.