A person uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the angular magnification if the person's eye is relaxed and has a near point of 25 cm?

A) 4.0
B) 5.0
C) 6.0
D) 7.0


B

Physics & Space Science

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Carnot Engine: One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C, the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J)(a) What is the actual efficiency of this engine?(b) What is the power output of this engine?(c) What would be the maximum possible efficiency for an engine using the same temperature extremes?

What will be an ideal response?

Physics & Space Science

A bullet moving at 244. m/s strikes a tree and penetrates a distance of 8.34 mm before stopping. What was the average acceleration of the bullet as it slowed?

What will be an ideal response?

Physics & Space Science

Two charged particles 1 m apart exert a 1-N force on each other. If the magnitude of each charge is doubled, the force on each particle will be

A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) none of the above

Physics & Space Science

Lasers are used to create holograms because

A. they are cool B. they exhibit high coherence C. they are red D. they have lots of energy

Physics & Space Science