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4vir4ik [10]
3 years ago
14

The theory that the Earth's crust and part of the upper mantle are broken into sections that move on a fluid layer of the mantle

is called...
A. Continental Drift
B. Wegener's Theory
C. Sea Floor Spreading
D. Plate Tectonics
Physics
1 answer:
VMariaS [17]3 years ago
6 0
I most sure about c but could be wrong
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The answer is option A .

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Water flows through a 2.5cm diameter pipe at a rate of
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Answer:

From the Bernoulli energy principle,

ΔP + 1/2ρΔv² = 0 -------------------------- eqn 1

where

ΔP = pressure drop = P2 - P1 = (1 - 0.25)x10⁵ N/m =7.5 x 10⁴N/m

Δv²= velocity change = v₂² - v₁²

ρ = water density = 1kg/m3

Recall volumetric flow rate, Q=A v = constant

A = cross sectional area = πr²=πd²/4

d=pipe diameter at point 2 = 2.5cm = 0.025m and Q =0.20m³/min = 0.00333m³/s

So A= 0.000491m²

we can get v2 = Q/A = 6.79m/s

From eqn 1, v₁² = 2(P2 - P1)/ρ + v₂²

v₁² =  (2 x 7.5 x 10⁴)/1000 + 6.79²

v₁² = 196

v₁ = 14m/s

we can now get the area of the constriction point 2, A₁ = Q/v₁

A₁ = 0.000238m² and the diameter now will be d₁

d₁² = 4 x A₁ / π

     = 4 x 0.000238/3.14 = 0.000303m²

d₁ = √0.000303 = 0.0174m

Therefore, the diameter of  a constriction in the pipe  at the new pressure = 0.0174m = 1.74cm

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3 years ago
Help needed Can a body be accelerating if it is moving in circle
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<em>Answer:</em>

<em>When </em><em>a </em><em>body </em><em>is </em><em>moving </em><em>on </em><em>a </em><em>circle </em><em>it </em><em>is </em><em>accelerating </em><em>because </em><em>centripetal </em><em>acceleration</em><em> </em><em>is </em><em>always </em><em>acting </em><em>on </em><em>it </em><em>towards </em><em>the </em><em>center.</em>

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<em>From </em><em>the </em><em>above </em><em>diagram,</em><em>we </em><em>can </em><em>say </em><em>the </em><em>acceleration</em><em> </em><em>is </em><em>always </em><em>acting </em><em>on </em><em>the </em><em>body </em><em>when </em><em>it </em><em>moves </em><em>in </em><em>a </em><em>circle.</em>

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At $.110 per kWh, what does it cost to leave a 40-W porch light on day and night for a year?
nlexa [21]

The cost of electricity be  $ 38.544.

<h3>What is electricity?</h3>

Electricity is the passage of charges in a conductor. From one end of the terminal to the other, charges are transmitted. Usually, the terminal moves from positive to negative. Since the nucleus holds the electrons loosely, they can move freely throughout the body.

Watts are units of power used to measure electrical output. 

Price of electricity is $ 0.110 per kWh .

If a 40-W porch light on day and night for a year, total amount of electricity spend = power of the bulb × time

= 40 W × 1 year

= 40 W × 365 day

= 40 W × 365 ×24 h

= 350400 Wh

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Hence,  the cost of electricity be = $350.4 × 0.110 =  $ 38.544.

Learn more about electricity here:

brainly.com/question/8971780

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A mirrored-glass gazing globe in a garden is 28.0 cm in diameter. part a what is the focal length of the glob
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For a curved mirror, the radius of curvature R is twice the focal length f:
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Since the diameter d is twice the radius R, we can rewrite (1) as
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f= \frac{d}{4}= \frac{28.0 cm}{4}=7.0 cm
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3 years ago
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