Which type of weather is characterized by spiral storms with winds of up to 300 km/hour?
A) hurricanes
B) tornadoes
C) tropical depressions
D) tropical storms
Answer: A
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Superconductors are materials that are good conductors of electricity
A. at any temperature B. only at temperatures below the critical temperature C. only at temperatures above the critical temperature
In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
The location of a star in the H-R diagram indicates its temperature and intrinsic brightness
a. True b. False Indicate whether the statement is true or false
Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m
What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2. A) 7180 m/s B) 7840 m/s C) 8230 m/s D) 11,000 m/s E) 13,400 m/s