A super-insulated house is at a temperature of 20°C. The temperature outside is 0°C. The surface area of the house is 200 m2, and the emissivity is 1 . Approximately how much energy is radiated (in W) per second?
a. 20 000
b. 2 000
c. 200
d. 2
e. 0.2
A
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A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm from the central axis of the wire. What is the magnitude of the current in the wire? (?0 = 4? × 10-7 T • m/
A) A) 7.5 mA B) 1.7 mA C) 3300 mA D) 24,000 mA
If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest
A) True B) False
The coefficients of static and kinetic friction between a 3.0-kg box and a horizontal desktop are 0.40 and 0.30, respectively. What is the force of friction that the desktop exerts on the box when a 15-N horizontal push is exerted on the box?
A) 12 N B) 8.8 N C) 15 N D) 6.0 N E) 4.5 N
Which of the following elements has the lowest ionization energy?
a. Ar b. Na c. Ne d. Li