Question

A.) A circular hole is drilled through an aluminum plate. When the plate is at a temperature of 20.0 ◦C the hole is measured and found to have a diameter of 1.994 cm. To what temperature will it be necessary to bring the plate if a spherical ball of diameter 2.000 cm is to pass through the hole? The coefficient of linear expansion for aluminum is 2.4 × 10−5 ◦C−1). A) 87.6 ◦C B) 59.7 ◦C C ¯ ) 145 ◦C D) 124 ◦C E) -105 ◦C

B.) A container having a volume of 3.0 m3 holds 4.0 moles of helium gas at 30 ◦C. If the helium behaves like an ideal gas, the total energy of the system is A) 2.14 ×104 J B) 2.73 ×104 J C) 2.42 ×104 J D ¯ ) 1.51 ×104 J E) 2.34 ×104 J

Answer 1