Spring tides occur ____

a. only during spring months
b. when high tides are unusually low and low tides are unusually high
c. when high tides and low tides are unusually low
d. when high tides are unusually high and low tides are unusually low
e. simultaneously with neap tides


d

Physics & Space Science

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Suppose that you wish to construct a simple ac generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns are needed?

A) 8 B) 16 C) 32 D) 64 E) 128

Physics & Space Science

Two identical concentric loops are arranged as shown in the diagram below. Loop 1 initially carries a steady current driven by the power supply shown, will the two loops briefly attract or repel each other as the current in loop 1 decays to zero? Suppose that when we turn off the power supply, it takes a small but finite time for the current to decay to zero in loop 1. In what direction does the current induced in loop 2 flow during this time interval?

A. They attract each other. B. They repel each other. C. They neither attract nor repel each other. D. One needs more information to answer.

Physics & Space Science

In 1661, who developed a definition of element that made the concept subject to laboratory investigation?

a. Berzelius b. Boyle c. Lavoisier d. Davy

Physics & Space Science

Exhibit 7-1 Three 5.0-kg masses are located at points in the xy plane as shown in the figure. ? ? Use this exhibit to answer the following question(s). Refer to Exhibit 7-1. What is the magnitude of the resultant force (caused by the other two masses) on the mass at the origin?

A. 2.7 × 10?8 N B. 2.1 × 10?8 N C. 1.8 × 10?8 N D. 2.4 × 10?8 N E. 2.9 × 10?8 N

Physics & Space Science