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1. A completely black metallic sphere with a radius of 10.0 cm is heated to 213 degrees Celsius. What is the total power of the

1. A completely black metallic sphere with a radius of 10.0 cm is heated to 213 degrees Celsius. What is the total power of the electromagnetic waves emitted by the sphere?

2. A building-mounted warning siren has a frequency of 88.0 Hz. What is the perceived frequency of a car approaching the siren at a speed of 60.0 km/h? speed of sound in air=340 m/s

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