All reversible engines operating between the same two temperatures have the same efficiency
Indicate whether the statement is true or false
TRUE
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What is the radius of the smallest electron orbit in a singly-ionized helium atom?
A) 1.06 × 10-10 m B) 1.32 × 10-11 m C) 5.29 × 10-11 m D) 2.65 × 10-11 m
Evidence for a very early "super rapid" inflation of the universe is that the 3-K radiation from opposite sides of the sky (i.e., 180 degrees or about 28 billion light years apart) is of nearly ___________ intensity. Time for light to travel this distance is ___________ the age of the universe in years
a. equal; greater than b. unequal; greater than c. equal; less than d. unequal; less than
A 95-N force exerted at the end of a 0.32-m long torque wrench produces a torque of 15 N ? m. What is the angle (less than 90°) between the wrench handle and the direction of the exerted force?
A) 30° B) 24° C) 36° D) 42°
The source of Earth's internal energy involves
A) kinetic energy. B) potential energy. C) radioactivity. D) the Sun.