You stand at attention with your arm overhead and finger pointing to the sky for 12 hours. During this entire time, your finger traces along the celestial equator in the sky. Where are you located on Earth?
a. North Pole b. South Pole
c. equator d. mid-latitude between the equator and the North Pole
c
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A projectile is shot horizontally at 23.4 m/s from the roof of a building 55 m tall. Effects of air are negligible. (a) Determine the time necessary for the projectile to reach the ground below
(b) Determine the distance from the base of the building that the projectile lands. (c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.
In ferromagnetic materials the small regions that act like tiny magnets are called
A) conductors. B) domains. C) iron filings. D) spins. E) ferromagnets.
Hot air flows through a square 60 cm x 60 cm steel heating duct and the outside surfaces are at 45ºC when the surrounding quiescent air is at 15ºC. Estimate the heat loss from the duct per unit length of the duct.
What will be an ideal response?
The H-R diagram of a young star cluster shows
a. that high-mass stars have not yet reached the main sequence yet. b. that low-mass stars have not yet reached the main sequence yet. c. mainly giant stars. d. no stars since none have reached the main sequence yet.