A 150 W light bulb is designed for an ac voltage of 120 V rms. What is the resistance of the bulb?
A. 150 
B. 144
C. 96.0
D. 68.0
E. 48.0
C. 96.0
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Thermal radiation is defined as
A) radiation with a spectrum whose shape depends only on the temperature of the emitting object. B) radiation produced by an extremely hot object. C) radiation that is felt as heat. D) radiation in the form of emission lines from an object.
The coefficient of linear expansion of aluminum is 24.0 × 10-6 K-1 and the density of aluminum at 0°C is 2.70 × 103 kg/m3. What is the density of aluminum at 300°C?
A) 3.93 × 103 kg/m3 B) 2.73 × 103 kg/m3 C) 2.70 × 103 kg/m3 D) 2.67 × 103 kg/m3 E) 2.64 × 103 kg/m3
Projectile motion is characterized by
A. constant velocity in the x direction and constant acceleration in the y direction B. constant acceleration in both the x and y directions C. constant velocity in both the x and y directions D. constant acceleration in the x direction and constant velocity in the y direction
The temperature at the Sun's core is about ________.
A. 1,500,000 K B. 150,000 K C. 15,000,000 K D. 15,000 K