2. If a box measures 3 ft long, 2 ft wide, and 2 ft tall, how many books (L = 8 in, W = 4 in, H = 1 in) can it contain in such a way that no part of any book would be visible when it is to be closed?
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- Four lamps are suspended 6m above the ground at the corners of a lawn 4m on each side. If each lamp emits 250 cd, calculate the illumination at the center of the lawn. Draw the figure.A light wave and sound wave travelling through air both have the same frequency (4000 Hz). Which wave has the bigger wavelength, or are they the same? Explain. (Sound waves travel through air at 340 m/s)Chapter 25: Problem 5: In the year 1178, five monks at Canterbury Cathedral in England observed what appeared to be an asteroid colliding with the moon, causing a red glow in and around it. It is hypothesized that this event created the crater Giordano Bruno, which is right on the edge of the area we can usually see from Earth. a) How long after the asteroid hit the Moon, which is 3.84 ×10⁵ km away, would the light first arrive on Earth in seconds?