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3 years ago

PLEASE HURRY ITS FOR A QUIZ

Physics

1 answer:

zaharov [31]3 years ago

7 0

I think it's D because momentum= mass times velocity

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How is a boomerang different from a airplane propeller

gayaneshka [121]

Boomerang has a curve the airplane propeller is four paddles

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4 years ago

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The slope at point A of the graph given below is: WILL MARK BRAINLIEST TO CORRECT ANSWER

steposvetlana [31]

RQ/PQ I think

rise/run

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3 years ago

If the speed of sound in air is 343 m/s, what is the shortest wavelength of sound that humans can hear?

GuDViN [60]

F = 1/T = 20,000 so T = 1/20,000
distance = speed * time 
L = 343 T 
L = 343/20,000 
L =. 01715 meters or about 1.7 centimeters

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3 years ago

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7. A force stretches a wire by 1 mm. a. A second wire of the same material has the same cross section and twice the length. How

Lera25 [3.4K]

Answer:

(a) The second wire will be stretched by 2 mm

(b) The third wire will be stretched by 0.25 mm

Explanation:

Tensile stress on every engineering material is given as the ratio of applied force to unit area of the material.

σ = F / A

Tensile strain on every engineering material is given as the ratio of extension of the material to the original length

δ = e / L

The ratio of tensile stress to tensile strain is known as Young's modulus of the material.

$Y = \frac{FL}{Ae}$

Part A

cross sectional area and applied force are the same as the original but the length is doubled

$\frac{FL_1}{A_1e_1} = \frac{FL_o}{A_oe_o} \\\\\frac{L_1}{e_1} = \frac{L_o}{e_o}\\\\e_1 = \frac{L_1e_o}{L_o} \\\\But, L_1 =2L_o\\\\e_1 = \frac{2L_oe_o}{L_o}\\e_1 = 2e_o$

The second wire will be stretched by 2 mm

Part B

a third wire with the same length but twice the diameter of the first

$\frac{FL}{A_1e_1} = \frac{FL}{A_oe_o} \\\\\frac{1}{A_1e_1} = \frac{1}{A_oe_o}\\\\\frac{4}{\pi d_1^2e_1} = \frac{4}{\pi d^2_oe_o}\\\\\frac{1}{d_1^2e_1} = \frac{1}{d^2_oe_o}\\\\d_1^2e_1 = d^2_oe_o\\\\e_1 = \frac{d^2_oe_o}{d_1^2} \\\\e_1 =(\frac{d_o}{d_1})^2e_o\\\\But, d_1 = 2d_o\\\\e_1 =(\frac{d_o}{2d_o})^2e_o\\\\e_1 =(\frac{1}{2})^2e_o\\\\e_1 =(\frac{1}{4})e_o$

e₁ = ¹/₄ x 1 mm = 0.25 mm

The third wire will be stretched by 0.25 mm

3 0

4 years ago

The acceleration of gravity on earth is approximately 10 m/s2 (more precisely, 9.8 m/s2. if you drop a rock from a tall building

VLD [36.1K]

From the equation;
a= -1÷2gT2
a= -5×3(3)
a= -45m/s
it will drop about -45m/s2.

8 0

3 years ago

*PLEASE HURRY ITS FOR A QUIZ*

PLEASE HURRY ITS FOR A QUIZ