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3 years ago

A sound wave has a frequency of 300 Hz. If the wavelength is .50 m, then what is the speed of

Physics

1 answer:

kherson [118]3 years ago

7 0

Answer:

15000 m/s

Explanation:

You just need to multiply the wavelength with the frequency.

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Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes ab

nata0808 [166]

To solve this problem we will apply the linear motion kinematic equations. On these equations we will define the speed as the distance traveled in a space of time, and that speed will be in charge of indicating the reaction rate of the individual. In turn, using the ratio of speed, position and acceleration, we will clear the position and determine the distance necessary for braking.

The relation to express the velocity in terms of position for constant acceleration is as follows

$v^2 = u^2+2a(s-s_0)$

Here,

u = Initial velocity

v= Final velocity

a = Acceleration

$s_0$ = Initial position

s = Final position

PART 1) Calculate the displacement within the reaction time

$d = vt$

$d = (44)(0.75)$

$d = 33ft$

In this case we can calculate the shortest stopping distance

$0^2 = 44^2+2(-2)(s-33)$

$s = 517ft$

PART 2)

PART 1) Calculate the displacement within the reaction time

$d = vt$

$d = (44)(3)$

$d = 132ft$

In this case we can calculate the shortest stopping distance

$0^2 = 44^2+2(-2)(s-132)$

$s = 616ft$

While a person without alcohol would cost 517ft to slow down, under alcoholic substances that distance would be 616ft

7 0

4 years ago

The mid-atlantic ridge crosses through iceland. physical features such as tensional fractures and cinder cone volcanoes are all

nlexa [21]

This indicates that they are moving away from each other, meaning that they form a divergent plate boundary, between the two continental plates, the Eurasian Plate moving eastward, and the North American Plate moving west, this forms the Mid Atlantic Ridge.<span>
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8 0

3 years ago

How could you use the barometer to determine the height of a building?

Nady [450]

Take the barometer to the roof of the building. Drop the barometer from the edge of the roof, and, with your wrist watch or a stop watch, measure the time it takes for the barometer to hit the ground or the street below. Then the height of the roof, in meters, is 4.9 times the square of the time in seconds.

5 0

3 years ago

A 7 kg cart is moving down a track at a speed of 9 m/s and hits a 11 kg cart sitting still. The two have an inelastic collision.

aliina [53]

Answer: 3.5 m/s

Explanation:

This problem can be solved by the <u>Conservation of Momentum principle</u> which establishes the initial momentum $p_{i}$ must be equal to the final momentum $p_{f}$ , and taking into account this is an inelastic collision:

Before the collision:

$p_{i}=mV_{o}+MU_{o}$ (1)

After the collision:

$p_{f}=(m+M)V_{f}$ (2)

Where:

$m=7 kg$ is the mass of the first cart

$V_{o}=9 m/s$ is the velocity of the first cart

$M=11 kg$ is the mass of the second cart

$U_{o}=0 m/s$ is the velocity of the second cart

$V_{f}$ is the final velocity of both carts

$p_{i}=p_{f}$ (3)

$mV_{o}+MU_{o}=(m+M)V_{f}$ (4)

Since $U_{o}=0 m/s$ :

$mV_{o}=(m+M)V_{f}$ (5)

$V_{f}=\frac{mV_{o}}{m+M}$ (6)

$V_{f}=\frac{(7 kg)(9 m/s)}{7 kg + 11 kg}$ (7)

Finally:

$V_{f}=3.5 m/s$

4 0

3 years ago

Two gases in a mixture pass through a filter at rates proportional to the gases' rms speeds. (a) find the ratio of speeds for th

Pavel [41]

Answer: 1.03 ,35CL

The rms speed is given by formula: $v_{rms}=\sqrt{\frac{3RT}{M}}$

RMS speed is inversely proportional to the molecular mass. To find ratio of rms speed we take the square root of ratio of molecular masses as: $\frac{v_{rms 35}}{v_{rms 37}} =\sqrt{\frac{M_{37}}{M_{35}}}
=\sqrt{\frac{37}{35}}
=1.03$

6 0

3 years ago