Power: A toaster is rated at 800 W when operating at 120 V dc. What is the resistance of its heating element?
A. 16 ?
B. 18 ?
C. 6.7 ?
D. 0.15 ?
Answer: B
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Most of the energy produced in the Sun is released in the form of visible light from the photosphere. However, some energy is released from the upper layers of the solar atmosphere
Which of the following best describes where other forms of light are released? A) The chromosphere is the source of ultraviolet light, and the corona is the source of X-rays. B) The chromosphere is the source of infrared light, and the corona is the source of ultraviolet light. C) The chromosphere is the source of X-rays, and the corona is the source of radio waves. D) The convection zone is the source of ultraviolet light, and the upper photosphere is the source of X-rays. E) Radio waves can pass directly through the gas which allows us to see the core.
A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time
Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction. B) cuts off unwanted radiation. C) allows high-frequency waves in and blocks low-frequency waves exiting. D) is transparent only to lower-frequency waves.
The first plants probably evolved from
A) plankton B) algae C) corals D) seaweed