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3 years ago

Throughout the problem, take the speed of sound in air to be 343 .

Physics

1 answer:

anyanavicka [17]3 years ago

8 0

Answer:

A pipe has a length of 1.15 m.

a) Determine the frequency of the first harmonic if the pipe is open at each end. The velocity of sound in air is 343 m/s. Answer in units of Hz

b) What is the frequency of the first harmonic if the pipe is closed at one end?

Answer in units of Hz

Explanation:

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In an electrical circuit 200mC of charge flows through a 50kohm resistor in 90 seconds. What is the power

ss7ja [257]

Answer: $0.2464\ W$

Explanation:

Given

Charge $Q=200\ mC$

Resistance $R=50\ k\Omega$

Time $t=90\ s$

Charge is the amount of current flown in a particular time

$Q=It\\\Rightarrow 200\times 10^{-3}=I\times 90\\\\\Rightarrow I=\dfrac{200\times 10^{-3}}{90}\\\\\Rightarrow I=2.22\times 10^{-3}\ A$

Power is the given by $P=I^2R$

Insert values

$\Rightarrow P=\left(2.22\times 10^{-3}\right)^2\times 50\times 10^3\\\\\Rightarrow P=246.42\times 10^{-3}\ W\\\\\Rightarrow P=0.2464\ W$

The power is in the circuit is $0.2464\ W$ .

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2 years ago

Does anyone know what these three are? I need help!

VashaNatasha [74]

Answer:

1. A

2. C

3. A

Explanation:

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3 years ago

A ball is launched from ground level and hits the ground again after an elapsed time of 4 seconds and after traveling a horizont

Mumz [18]

Answer:

a. It is constant the whole time the ball is in free-fall

Explanation:

If we divide the movement on its vertical and horizontal components, and we concentrate on the vertical component, let's call x-component, and analyze Newton's second's law:

$\sum\overrightarrow{F_{x}}=m\overrightarrow{a_{x}}$

with $\sum\overrightarrow{F_{x}}$ , $a_{x}$ the acceleration on horizontal direction and m the mass of the ball, because the only force acting on the object is gravity that is always vertical, there're not forces on the horizontal direction that means $\sum\overrightarrow{F_{x}}=0$ and by (1) that implies $a_{x}$ =0 there's not acceleration on horizontal direction.

Because acceleration is the rate at what velocity changes and there's no acceleration, there's no change in velocity, in other words velocity is constant on horizontal direction.

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3 years ago

Superman is standing 393m horizontally away from Lois Lane. A villian drops a rock 4 m directly above Lois. I f Superman is to i

Nat2105 [25]

You have to draw a triangle

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2 years ago

The graph shows position versus time for an object moving with the constant acceleration. what is the final velocity of the obje

natali 33 [55]

Answer:

3.0 m/s

Explanation:

The equation of motion for constant acceleration (a) is ...

$x(t)=\dfrac{1}{2}at^2 +v_0t+x_0$

The problem statement tells us v₀ = 1, and we read from the graph that x₀=1. We also read from the graph that x(10) = 21. Filling these values into the equation, we can find <em>a</em> and x'(10).

$21 = \dfrac{1}{2}a(10^2)+1(10)+1\\\\10=50a\qquad\text{subtract 11}\\\\a=\dfrac{1}{5}\\\\x'(t)=at+v_0\\\\x'(10)=\dfrac{1}{5}\cdot 10+1=3.0$

The final velocity of the object at t=10 s is about 3.0 m/s.

_____

<em>Comment on the graph</em>

We note this graph better represents increasing acceleration than it does constant acceleration. x(2) = 3.4 per the equation. It is graphed as about 4.

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3 years ago