Water in a pond is at 2ºC and the air temperature is -20ºC with a convective heat transfer coefficient of 30 W/m^2?K above the water. When the water begins to freeze and the lower convective heat transfer coefficient between the ice and the water is 20 W/m^2?K, estimate the ice thickness after 8 hours.
What will be an ideal response?
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The figure shows two 1.0 kg-blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250 g. The entire assembly is accelerated upward at 2.3 m/s2 by force . What is the tension at the top end of rope 1?
A) 18 N B) 15 N C) 2.9 N D) 3.5 N
A sound with ten times the amplitude of another sound is judged to be ten times as loud
a. True b. False Indicate whether the statement is true or false
An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can accommodate 15 A of current. How many heaters can be safely operated in the circuit?
A) 2 B) 3 C) 4 D) 5 E) more than 5
Spherical Mirrors: When an object is 12 cm in front of a concave spherical mirror, the image is formed 3.0 cm in front of the mirror. What is the focal length of the mirror?
A. 15 cm B. 4.0 cm C. 2.4 cm D. 1.3 cm