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navik [9.2K]
4 years ago
12

A _____ is a device that multiplies force or increases speed and makes work easier.

Physics
2 answers:
Lena [83]4 years ago
5 0
Machine................
max2010maxim [7]4 years ago
4 0
Machine is the answer :)
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A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the
Advocard [28]

Answer:

a

The total distance traveled is D  = 26760 \ m

b

The average velocity is  v_{avg} =  6.8 \ m/s

Explanation:

From the question we are told that

     The time taken for first part t_1 =  22 \ minutes = 22*60 = 1320 \ s

      The speed for the first part is  v_1 =  7.2 \ m/s

        The time taken for second part is t_2 =  36 \ minutes =  2160 \ s

        The speed for the second  part is  v_2 =  5.1 \ m/s

         The time taken for third  part is  t_3 =  8 \ minutes = 480 \ s  

          The speed for the third  part is  v_3 =  13 m/s

Generally

        distance(D)  =  velocity * time

Therefore the total distance traveled is  

         D  =  (v_1 * t_1) + (v_2 * t_2 ) + (v_3 * t_3)

substituting values

        D  =  (7.2 * 1320) + (5.1 * 2160) + (13 * 480)

        D  = 26760 \ m

Generally the average velocity is mathematically represented as

        v_{avg} =  \frac{D}{t_{total}}

Where t_{total} is the total time taken which is mathematically represented as

       t_{total}  =  1320 + 2160 + 480

      t_{total}  =3960\ s

The average velocity is

        v_{avg} =  \frac{26760}{3960}

        v_{avg} =  6.8 \ m/s

   

8 0
3 years ago
Two observers in different inertial reference frames moving relative to each other at nearly the speed of light see the same two
lions [1.4K]

Answer:

The correct answer is d Both the observer's are correct

Explanation:

We know by postulates of relativity that laws of physics are same in different inertial frames.

Thus for each of the frames they make observations related to their frames and since the observations are true for their individual frames they both are correct. But when we compare the two frames we need to use transformation equations to compare both the results.

3 0
3 years ago
What happens if you add additional,solid NaCl after the maximum has been reached?
azamat
<span>it would bond to the phosphate 

</span>
3 0
4 years ago
Read 2 more answers
How can I act more like Runa from Kakegurui?
igomit [66]

Answer:

LOVE HER, and just study her, and sometimes just pause and try and act like that, or watch the backstory and go through everything they went through.

Explanation:

Hope this helps

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3 years ago
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An ambulance is rapidly approaching you at a stop light. What happens to the frequency and pitch of the sound as the ambulance d
vagabundo [1.1K]

Answer:

A )

Explanation:

This change in frequency observation occur due to doppler effect

if the wave source moves,In the time between one wave peak being emitted and the next, the source will have moved so that the shells will no longer be concentric. The wavefronts will get closer together in front of the source as it travels and will be further apart behind it.  (see the graph)

when the person standing still in front of the ambulance, he will observe a <em>higher frequency </em>than before as the source travels towards them.

f_(observed)=\frac{V_(wave)}{V_(wave)-V_(source)} *f_(original)

The pitch we hear depends on the frequency of the sound wave.

A high frequency corresponds to a high pitch

as we hear a higher frequency , it makes the <em>pitch higher</em> too

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3 years ago
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