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Pepsi [2]
3 years ago
15

An observer sits in a boat watching wave fronts move past the boat. The distance between successive wave crests is 0.80 m, and t

hey are moving at 2.2 m / s.
What is the wavelength of these waves?
a. 1.6 m
b. 2.2 m
c. 0.80 m

What is the frequency of these waves?
a. 0.36 Hz
b. 2.8 Hz
c. 0.80 Hz

What is the period of these waves?
a. 0.80 s
b. 0.36 s
c. 2.8 s
Physics
1 answer:
Rama09 [41]3 years ago
7 0

To solve this problem we will use the three requested concepts: Wavelength, frequency and period.

The wavelength is the distance between each crest, therefore it is already given and is 0.8m

<em>The correct answer is C.</em>

The frequency can be described as a relationship between wave speed and wavelength therefore

f = \frac{v}{\lambda}

f = \frac{2.2}{0.8}

f = 2.75Hz \approx 2.8Hz

<em>The correct answer is B.</em>

The period is the inverse of the frequency therefore

T = \frac{1}{f}

T = \frac{1}{2.8}

T = 0.35s

<em>The correct answer is B.</em>

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At the end of cylindrical rod of length l = 1 m and mass M = 1 kg rotating horizontaly along the vertical axis in its center wit
matrenka [14]

Answer:

w = 0.943 rad / s

Explanation:

For this problem we can use the law of conservation of angular momentum

       

Starting point. With the mouse in the center

            L₀ = I w₀

Where The moment of inertia (I) of a rod that rotates at one end is

         I = 1/3 M L²

Final point. When the mouse is at the end of the rod

          L_{f} = I w + m L² w

As the system is formed by the rod and the mouse, the forces during the movement are internal, therefore the angular momentum is conserved

        L₀ = L_{f}

        I w₀ = (I + m L²) w

        w = I / I + m L²) w₀

We substitute the moment of inertia

        w  = 1/3 M L² / (1/3 M + m) L²    w₀

        w = 1 / 3M / (M / 3 + m) w₀

We substitute the values

      w = 1/3 / (1/3 + 0.02) w₀

      w = 0.943 w₀

To finish the calculation the initial angular velocity value is needed, if we assume that this value is w₀ = 1 rad / s

        w = 0.943 rad / s

3 0
3 years ago
Explaining How Momentum Can Cause
Ghella [55]

Answer:

The astronaut can throw the hammer in a direction away from the space station. While he is holding the hammer, the total momentum of the astronaut and hammer is 0 kg • m/s. According to the law of conservation of momentum, the total momentum after he throws the hammer must still be 0 kg • m/s. In order for momentum to be conserved, the astronaut will have to move in the opposite direction of the hammer, which will be toward the space station.

Explanation:

6 0
3 years ago
A voltmeter and an ammeter are used to respectively monitor the voltage across and the current through a resistor connected to a
dsp73

Answer:

(a) 95 volt

(b)  134.33 volt

(c) 10.746 volt

(d) Average delivered power is 722 watt  

Explanation:

We have given value of resistance R = 12.5 ohm

Current in the ammeter i = 7.60 A

(a) Rms voltage in the resistor V=iR=7.6\times 12.5=95volt

(b) We know that rms voltage is given by v_r=\frac{v_m}{\sqrt{2}}

v_m=\sqrt{2}v_r=1.414\times 95=134.33volt

So peak voltage will be equal to 134.33 volt

(c) Maximum current is equal to i_m=\sqrt{2}i_r=1.414\times 7.6=10.746A

(d) Average power delivered in the resistor is equal to

P = VI

So P=95\times 7.6=722watt

7 0
3 years ago
If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what
REY [17]

The question is incomplete! The complete question along with answer and explanation is provided below.

Question:

A student bikes to school by traveling first 1.00 miles north, then 0.500 miles west and finally 0.200 miles south.

If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what distance db would the bird cover

Given Information:  

distance towards north = dn =  1.00 mi

distance towards west = dw =  0.500 mi

distance towards south = ds =  0.200 mi

Required Information:  

distance covered by bird = db = ?

Answer:

distance covered by bird = 0.94 miles

Explanation:

As you can see in the attached image, by applying the Pythagoras theorem,

db = √(dn - ds)² + dw²

db = √ (1.0 - 0.20)² + 0.50²

db = √ 0.80² + 0.50²

db = 0.94 miles

Therefore, the bird would cover a distance of 0.94 miles

5 0
3 years ago
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Resolvemos los siguientes planteamientos.
Luden [163]

Answer:

if you can type it in english

Explanation:

it's 4

8 0
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