A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
a. 49 N
b. 0.29 kN
c. 0.34 kN
d. 0.25 kN
e. 0.76 kN
a
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A condenser for a large refrigerator is a four-shell-eight-tube-pass heat exchanger. The condensing fluid is ammonia at 40ºC and the overall heat transfer coefficient is 500 W/m^2?K. 10 kg/s of water at 5ºC, heated to 30ºC, is used to cool the ammonia. Determine the mass flow of ammonia if its heat of vaporization is 1102 kJ/kg and then determine the surface area of the heat exchanger.
What will be an ideal response?
A puck on a frictionless air hockey table has a mass of 5.0 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The angular momentum of the puck (in kg?m2/s) is
a.
80
b.
20
c.
30
d.
60
e.
50
A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
A) 6.7 mm B) 6.7 cm C) 3.3 mm D) 3.3 cm E) 3.3 m
What is the absolute pressure at a distance 5.00 m below the surface of a lake? Assume the density of the water in the lake is 1000 kg/m3
A) 5.00 × 103 N/m2 B) 1.50 × 105 N/m2 C) 0.49 × 105 N/m2 D) 1.05 × 105 N/m2 E) 4.66 × 105 N/m2