An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,
(a) what voltage is present in the secondary?
(b) what current is present in the secondary?
(a) 240 V (b) 0.40 A
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A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
A) 20 cm behind the mirror B) 25 cm behind the mirror C) 100 cm in front of the mirror D) 25 cm in front of the mirror E) 20 cm in front of the mirror
A clear plastic sandwich bag filled with water can act as a crude converging lens in air. If the bag is filled with air and placed under water, the effective lens is
1.converging 2.diverging
An atom must emit a photon when a(n) ____
a. electron moves from a lower to a higher energy level b. proton moves from a lower to a higher energy level c. proton moves from a higher to a lower energy level d. electron moves from a higher to a lower energy level e. atom becomes ionized
Answer the following questions for projectile motion on level ground assuming negligible air resistance (the initial angle being neither 0º nor 90º: (a) Is the acceleration ever zero? (b) Is the acceleration ever in the same direction as a component of velocity? (c) Is the acceleration ever opposite in direction to a component of velocity?
A. (a) No, (b) No, when the projectile is coming down, (c) No, on way up, because the acceleration is always downward throughout the satellite trip. B. (a) No, (b) Yes, when the projectile is coming down, (c) Yes, on way up, because the acceleration is always downward throughout the satellite trip. C. (a) Yes, (b) No, when the projectile is coming down, (c) Yes, on way up, because the acceleration is always downward throughout the satellite trip.