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3 years ago

PLA help if you understand

Physics

1 answer:

kolbaska11 [484]3 years ago

6 0

Answer:

b - it is not based on experimental data collected by scientists

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What amount of energy is required to change a spherical drop of water with a diameter of 1.60 mm 1.60 mm to six smaller spherica

Vikki [24]

Answer:

0.4731 μJ

Explanation:

Surface tension = surface energy/surface area.

Let the radius of the big sphere be R = 0.8 mm = 8 × 10⁻⁴ m

Radius of the small spheres = r

Surface Area of the big sphere = 4πR² = 4π(8 × 10⁻⁴)² = 0.0000080425 m² = 8.0425 × 10⁻⁶ m²

Surface energy of the big sphere = surface tension × surface area = 72 × 10⁻³ × 8.0425 × 10⁻⁶ = 5.791 × 10⁻⁷ J

Volume of big sphere = 4πR³/3 = 4π(8.0 × 10⁻⁴)³/3 = 2.145 × 10⁻⁹ m³

This volume is separated into 6 equal smaller drops,

Volume of one small sphere = (2.145 × 10⁻⁹)/6 = 3.574 × 10⁻¹⁰ m³

Each small sphere would have a radius as calculated from

4πr³/3 = 3.574 × 10⁻¹⁰ = 0.00044 m = 0.44 mm

Surface area of each small sphere = 4πr² = 4π(0.00044)² = 0.0000024356 m² = 2.436 × 10⁻⁶ m²

Surface area of 6 small spheres = 6 × 2.436 × 10⁻⁶ = 0.0000146141 m²

Surface energy of 6 small spheres = surface tension of water × Surface area of 6 small spheres = 72 × 0.001 × 0.0000146141 = 0.0000010522 J = 1.0522 × 10⁻⁶ J

Difference in surface energy of the big sphere and 6 small spheres = (1.0522 × 10⁻⁶) - (5.791 × 10⁻⁷) = 0.0000004731 J = 4.731 × 10⁻⁷ J = 0.4731 μJ

7 0

3 years ago

A person walks 45 m East and then walks 39 m at an angle 40◦ North of East. What is the magnitude of the total displacement? Ans

vredina [299]

Answer:

r = 78.95 m

Explanation:

given,

Person Walk in east, r₁ = 45 m

Then he walk, r₂= 39 m in the direction of 40◦ North of East.

writing the total displacement in x- direction

r₁ₓ = 45 m

r₂ₓ = 39 cos 40°

r₂ₓ = 29.87 m

total displacement in x-direction

rₓ = r₁ₓ + r₂ₓ

rₓ = 45 + 29.87

rₓ = 74.87 m

displacement in y-direction

r_{1y} = 0 m

r_{2y} = 39 sin 40°

r_{2y} = 25.07 m

total displacement in y- direction

r_y = 25.07 m

using Pythagoras theorem for the magnitude calculation

$r = \sqrt{r_x^2 + r_y^2}$

$r = \sqrt{74.87^2 +25.07^2}$

r = 78.95 m

The magnitude of total displacement is equal to 78.95 m.

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3 years ago

It is easier to add vectors together if we split them into what? A. Sizes B. Components C. Quadrants D. Lines

jonny [76]

Answer:

<h2> B. Components</h2>

Explanation:

Splitting vectors into components makes it easier to perform operations on them, typically categorizing vectors into horizontal and vertical components which are the two components makes it very easy to perform operations, since they are similar terms and operations cab be done easily

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4 years ago

A student uses a spring with a spring constant of 130 N/m in his projectile apparatus. When 56 J of

Triss [41]

Explanation:

$potentional \: energy \: = \frac{1}{2} k {x}^{2} \\ 56 = \frac{1}{2} \times 130 \times {x}^{2} \\ {x}^{2} = \frac{56}{65} \\ x = \sqrt{ \frac{56}{65} } meter$

plz..

mark it as a brilliant answer

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3 years ago

What is a precipitate?

Lunna [17]

Rain is considered a precipitate. Along with: drizzle, sleet, snow and hail.

hope this helps :)

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4 years ago

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