A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 105 J/kg).
What will be an ideal response?
20.8 J (per second)
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The _____ marks the top of the sky above your head
A) north point B) zenith C) south point D) nadir
An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 2.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 1,000 
A. 1.46 cm B. 1.20 cm C. 1.10 cm D. 0.90 cm E. 0.75 cm
Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's apparent brightness in our sky?
A) It would decrease by a factor of 2. B) It would decrease by a factor of 4. C) It would increase by a factor of 2. D) It would increase by a factor of 4. E) It would remain the same.
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor. The coefficient of static friction between the person's shoes and the floor is 0.700
What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700