100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)
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A) have lifetimes long enough for advanced life to evolve B) have lifetimes long enough for planets to form and for life to appear, but not long enough for advanced life C) do not contain enough heavy elements to form planets D) have lifetimes too short for planet formation
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N. As the string unwinds the pulley begins to rotate
What is the speed of the string after it has unwound 1.25 m? A) 2.09 m/s B) 2.36 m/s C) 1.18m/s D) 3.18 m/s E) 4.95 m/s
An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?
A) 260 mi/h B) 280 mi/h C) 275 mi/h D) 270 mi/h
To cause an object to move in a circle, a ______________ force is necessary
a. balanced b. functional c. centripetal d. centrifugal