What are the differences between neap tides and ebb tides?
a -The tidal range of a spring tide is larger than the tidal range of a neap tide.
b -During a spring tide, the moon, Earth and sun are aligned along a single line. During a neap tide, the moon and sun act on the Earth in right angles.\
c -When a spring tide occurs, the moon is new or full. When a neap tide occurs. The moon is at first quarter or new quarter.
d -All of the above
Answer: d -All of the above
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A brass rod with a length of 10.0 cm is placed end to end with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100
and a cold temperature of 10.0
The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m C and 230 W/m
respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
A. 55.3 W B. 65.3 W C. 70.3 W D. 78.1 W E. 85.3 W
Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points in the +y direction and has a magnitude that depends only on y. For which of the following gaussian surfaces would it be easiest to calculate the net flux of the electric field?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.
Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
Two blocks in contact with each other are pushed to the right across a rough horizontal surface by the two forces shown. If the coefficient of kinetic friction between each of the blocks and the surface is 0.30, determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg block.
A. 15 N B. 25 N C. 11 N D. 22 N E. 33 N