A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?

A) 84 km/h
B) 89 km/h
C) 90 km/h
D) 91 km/h


B

Physics & Space Science

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A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?

A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J

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The total number of protons and neutrons in the nucleus of an tom is referred to as its

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On a scale in which the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is ________

A) about 30 meters B) small enough to fit within your hand C) about 1 meter D) about 5 meters

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