A layer of kerosene (n = 1.45) is floating on water (n = 1.33). For what angles of incidence at the kerosene-water interface will light be totally internally reflected within the kerosene?
? > 66.5°
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Torques T 5 5.7 kN?m are applied to a hollow aluminum shaft (G 5 27 GPa and d1 5 52 mm). The allowable shear stress is 45 MPa and the allowable normal strain is 8.0 3 1024. The required outside diameter d2 of the shaft is approximately:
(A) 38 mm
(B) 56 mm
(C) 87 mm
(D) 91 mm
A girl and her bicycle have a total mass of 42 kg. At the top of the hill her speed is 4.00 m/s. The hill is 14.3 m high and 112 m long. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom?
a. 4.00 m/s b. 15.8 m/s c. 13.8 m/s d. 63.1 m/s e. She stops before she reaches the bottom.
A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg. What is the tension in the lifting cable (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water?
A) (a) 2.0 × 105 N (b) 1.7 × 105 N B) (a) 1.7 × 105 N (b) 2.0 × 105 N C) (a) 2.6 × 103 N (b) 2.0 × 105 N D) (a) 2.0 × 105 N (b) 2.6 × 103 N
Two charges of equal magnitude but opposite sign are 10 cm apart. The potential is largest
A. close to the positive charge. B. halfway between the two charges. C. close to the negative charge. D. far away from the two charges.