A 600-kg car traveling at 24.5 m/s is going around a curve having a radius of 120 m that is banked at an angle of 20°
(a) Is the curve properly banked for the car's speed? (b) What is the minimum coefficient of static friction required between the road and the car's tires so the car does not skid?
(a) No (b) 0.12
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What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies? For lead: LV = 207 kcal/kg at 1744°C, LF = 5.9 kcal/kg at 328°C
What will be an ideal response?
What feature of interstellar dust is inferred by the polarization of starlight?
A) its shape B) its composition C) its location in space D) its presence in molecular clouds E) its presence in dark nebulae
If a 10-V battery, with negligible internal resistance, and a 15-? resistor are connected in series, what is the amount of electrical energy transformed to heat per coulomb of charge that flows through the circuit?
a. 0.67 J b. 1.5 J c. 10 J d. 150 J e. 25 J
When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves
A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above