How much money does it cost to leave on 10 60 watt lights for 15 hours, if the cost of electricity is 8 cents per kWh?
a. 15¢ b. 32¢ c. 72¢ d. 120¢ e. 480¢
c
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Calculate the entropy of mixing for 2 moles of an alloy that has a composition of 30 atomic %copper and 70 atomic %nickel.
What will be an ideal response?
A skier, of mass 60. kg, pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10. m in elevation?
A) 0.20 km/s B) 15. m/s C) 10. m/s D) 0.15 km/s E) 49. m/s
An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy? (melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)
What will be an ideal response?
What is 56 + (32.00 )/(1.2465 + 3.45 ) written with the correct number of significant figures?
A) 62.8 B) 62.812 C) 62.81 D) 63 E) 62.8123846