A circular loop of wire of radius 10 cm carries a current of 6.0 A. What is the magnitude of the magnetic field at the center of the loop? (?0 = 4? × 10-7 T ? m/
A)
A) 3.8 × 10-5 T
B) 3.8 × 10-7 T
C) 1.2 × 10-5 T
D) 1.2 × 10-7 T
E) 3.8 × 10-8 T
A
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A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal. (a) Calculate the efficiency each cycle. (b) Calculate the work done each cycle
What will be an ideal response?
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X?
Suppose that we place an aluminum cylinder, a wooden block, and a Styrofoam cup on a table and leave them there for several hours. We then come back into the room and feel each object. (a) Which (if any) feels coolest?
A. The aluminum cylinder B. The wooden block C. The Styrofoam cup D. All are the same.
A jar holds 2.0 L of ideal nitrogen gas, N2, at STP. The atomic mass of nitrogen is 14.0 g/mol, the ideal gas constant is R = 8.31 J/mol ? K,
Avogadro's number is NA = 6.022 × 1023 molecules/mol, and 1.00 atm = 101 kPa. (a) How many moles of nitrogen are in the jar? (b) How many nitrogen molecules are in the jar? (c) What is the mass of the nitrogen in the jar?