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4 years ago

What is the focal length of 2.30 D reading glasses found on the rack in a drugstore?

Physics

1 answer:

irakobra [83]4 years ago

8 0

Answer:

Focal length, f = 0.43 meters

Explanation:

It is given that,

Power of the reading glasses, P = 2.3 D

We need to calculate the focal length of the reading glasses. The relationship between the power and the focal length inverse i.e.

$P=\dfrac{1}{f}$

$f=\dfrac{1}{P}$

$f=\dfrac{1}{2.3\ D}$

f = 0.43 m

So, the focal length of the reading glasses found on the rack in a drugstore is 0.43 meters.

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3 years ago

A ball is hit with a paddle, causing it to travel straight upward. It takes 2.90 s for the ball to reach its maximum height afte

zmey [24]

Answer:

A. 28.42 m/s

B. 41.21 m

Explanation:

From the question given above, the following data were obtained:

Time (t) to reach the maximum height = 2.90 s

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A. Determination of the initial velocity of the ball.

Time (t) to reach the maximum height = 2.90 s

Final velocity (v) = 0 m/s (at maximum height)

Acceleration due to gravity (g) = 9.8 m/s²

Initial velocity (u) =?

v = u – gt (since the ball is going against gravity)

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Collect like terms

0 + 28.42 = u

u = 28.42 m/s

Thus, the initial velocity of the ball is 28.42 m/s

B. Determination of the maximum height reached by the ball.

Final velocity (v) = 0 m/s (at maximum height)

Acceleration due to gravity (g) = 9.8 m/s²

Initial velocity (u) = 28.42 m/s

Maximum height (h) =?

v² = u² – 2gh (since the ball is going against gravity)

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Collect like terms

0 – 807.6964 = – 19.6h

– 807.6964 = – 19.6h

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h = 41.21 m

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3 years ago

On a roller coaster ride at an amusement park, a car travels from 7.6 m/s to 56 m/s in 3 seconds. whats the cars acceleration?

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Acceleration is defined as rate of change in velocity

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t = time interval to change the velocity = 3 s

now we will plug in all values in the above equation

$a = \frac{56 - 7.6}{3}$

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