A transformer with 800 turns on the primary coil is used to decrease the voltage from 2000 V to 120 V for home use. How many turns should be in the secondary coil?
48 turns
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A body in a room at 300 K is heated to 3,000 K. The amount of energy radiated each second by the body increases by a factor of
a. 10 b. 100 c. 1,000 d. 10,000 e. 100,000
Dimensional Analysis: The period P of oscillation of a pendulum (the time interval needed to complete one full oscillation) can be expressed in terms of the mass m of the plumb bob, the length L of the string, and the acceleration due to gravity, g, as P =kmbLcgd, where k, b, c, and d are dimensionless constants. What must be the values of b, c, and d?
What will be an ideal response?
The skinny tires of a 10-speed racing bicycle require more air pressure than the fat tires on an equally massive mountain bike because
A. the racing bike exerts more force on the ground. B. the area of contact of the racing bike's tires is greater than that of the bike with fat tires. C. the racing bike touches the ground over a smaller area than the bike with fat tires. D. the racing bike moves faster.
The calendar we presently use is the ______________ calendar
Fill in the blank(s) with correct word