Objects A and B are made of the same substance, but object A is twice as massive as object B. Object A originally has a temperature of 100°C and B has a temperature of 0°C. Suppose these objects are put inside a well-insulated cup and are allowed to come to a common temperature Tf . What is that temperature? Select the closest answer.

A. 75°C
B. 67°C
C. 50°C
D. 33°C
E. 25°C


B. 67°C

Physics & Space Science

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Projectile Motion: A projectile is fired from ground level with a speed of 150 m/s at an angle 30° above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s?

A. 150 m/s B. 35 m/s C. 130 m/s D. 75 m/s E. 38 m/s

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Which of these Galilean satellites is most geologically active?

a. Io b. Europa c. Callisto d. Ganymede

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Which of these are good conductors?

A) feathers. B) wood. C) snow. D) all the above E) none of the above

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An assumption that Earth processes occurring today have always occurred is called

A) the principle of superposition. B) uniformitarianism. C) the principle of original horizontality. D) theory of unconformity.

Physics & Space Science