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2 years ago

A bag weighing 20 N is pushed horizontally a distance of 35 m across a

Physics

1 answer:

topjm [15]2 years ago

6 0

Answer:

350J

Explanation:

Given parameters:

Weight of bag = 20N

Distance moved horizontally = 35m

Force applied = 10N

Unknown:

Work done on the bag = ?

Solution:

Work done is the force applied to move a body through given distance.

Work done = Force applied x distance

So;

Work done = 10 x 35 = 350J

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3 years ago

Suppose astronomers built a 20-meter telescope. How much greater would its light-collecting area be than that of the 10-meter Ke

nirvana33 [79]

Answer:

4 times greater

Explanation:

Step 1: Calculate light-collecting area of a 20-meter telescope (A₁) by using area of a circle.

Area of circle = π*r² = $\frac{\pi d^{2}}{4}$

Where d is the diameter of the circle = 20-m

$A_{1} = \frac{\pi d^{2}}{4}$

$A_{1} = \frac{\pi (20^{2})}{4}$

A₁ = 314.2 m²

Step 2: Calculate light-collecting area of a 10-meter Keck telescope (A₂)

$A_{2} = \frac{\pi d^{2}}{4}$

Where d is the diameter of the circle = 10-m

$A_{2} = \frac{\pi (10^{2})}{4}$

A₂ = 78.55 m²

Step 3: divide A₁ by A₂

$= \frac{314.2 m^2}{78.55 m^2}$

= 4

Therefor, the 20-meter telescope light-collecting area would be 4 times greater than that of the 10-meter Keck telescope.

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3 years ago

Light in air enter crown glass (n = 1.52) at an angle of 35 degrees. What is the refracted angle?

Dovator [93]

Answer:

22.17 degree

Explanation:

n = 1.52

Angle of incidence, i = 35 degree

Let the angle of refraction is r.

use the Snell's law

n = Sin i / Sin r

Sin r = Sin i / n = Sin 35 / 1 .52

Sin r = 0.37735

r = 22.17 degree

Thus, the ray is refracted at an angle of 22.17 degree.

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3 years ago

At what age can a person begin taking actions that will reduce the risk of dementia

Snowcat [4.5K]

Answer:

Any time bud, keep good health

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Explanation:

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3 years ago

A total charge of 0.009 passes through a cross sectional area of a nichrome wire in 3.5 s. What is the current in the wire?

Marrrta [24]

Answer:0.003 amperes

Explanation:

Quantity of charge=0.009

Time=3.5seconds

current=quantity of charge ➗ time

Current=0.009 ➗ 3.5

Current=0.003 amperes

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3 years ago