A 6.00-V battery is connected across the primary coil of a transformer having 50 turns. If the secondary coil of the transformer has 100 turns, what voltage appears across the secondary?
1.24.0 V
2.12.0 V
3.6.00 V
4.3.00 V
5.none of those answers
5
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A vertical side of a cooling tower is approximately 90ºC when the surrounding air is 25ºC. If the tower is 30 m high, estimate the maximum vertical velocity of the air due to natural convection.
What will be an ideal response?
Significant Figures: What is the product of 12.56 and 2.12 expressed to the correct number of significant figures?
A. 27 B. 26.6 C. 26.23 D. 26.627
What do we mean when we say that the Sun is in gravitational equilibrium?
A) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity. B) The Sun maintains a steady temperature. C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. D) The Sun always has the same amount of mass, creating the same gravitational force.
The acceleration of a ball as it rolls down a ramp is 3 m/s2 . It starts from rest. (a) What is the ball's speed after 4 seconds? (b) How far does the ball travel during the 4 seconds?