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2 years ago

5

A man lifts a 200 pound barbell over his head using 890 Newtons of force. It traveled a distance of 2.4 meters. Calculate the wo

rk done.
A. 2,136j
B. 83j
C. 371j
D. 480j

1 answer:

N76 [4]2 years ago

5 0

Answer:

371j

Explanation:

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Answer:

1.

109.6 cm , - 1.74 , real

2.

1.5

Explanation:

1.

d₀ = object distance = 63 cm

f = focal length of the lens = 40 cm

d = image distance = ?

using the lens equation

$\frac{1}{f} = \frac{1}{d_{o}} + \frac{1}{d}$

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$m = \frac{-d}{d_{o}}$

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2

d₀ = object distance = a

d = image distance = - (a + 5)

f = focal length of lens = 30 cm

using the lens equation

$\frac{1}{f} = \frac{1}{d_{o}} + \frac{1}{d}$

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a = 10

magnification is given as

$m = \frac{-d}{d_{o}}$

$m = \frac{- (- (a +5))}{a}$

$m = \frac{(5 + 10)}{10}$

m = 1.5

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