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4vir4ik [10]
4 years ago
8

Mr.nguyen decides to walk to school. How long does it take him to walk 10000m if he is traveling with a constant velocity of 2m/

s?
Physics
1 answer:
exis [7]4 years ago
8 0

Answer:

5000 s

Explanation:

Mr. Nguyen is moving in uniform motion (constant speed), therefore the distance he covers is given by the equation:

d=vt

where

d is the distance

v is the speed

t is the time taken

Here we have

d = 10000 m

v = 2 m/s

Solving for t, we find the time taken to cover this distance:

t=\frac{d}{v}=\frac{10000}{2}=5000 s

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A 121-cm-long, 4.00 g string oscillates in its m = 3 mode with a frequency of 180 Hz and a maximum amplitude of 5.00 mm. What ar
Alex777 [14]

Answer:

0.8067 m

69.696 N

Explanation:

m = Mode = 3

M = Mass of string = 4 g

f = Frequency = 180 Hz

l = Length of string = 121 cm

Length of the string is given by

l=m\dfrac{\lambda}{2}\\\Rightarrow \lambda=2\dfrac{l}{m}\\\Rightarrow \lambda=2\times \dfrac{1.21}{3}\\\Rightarrow \lambda=0.8067\ m

The wavelength is 0.8067 m

Linear density is given by

\mu=\dfrac{M}{l}\\\Rightarrow \mu=\dfrac{4\times 10^{-3}}{1.21}

Speed of the wave

v=f\lambda\\\Rightarrow v=180\times 2\times \dfrac{1.21}{3}\\\Rightarrow v=145.2\ m/s

Speed of wave is given by

v=\sqrt{\dfrac{T}{\mu}}\\\Rightarrow T=\mu v^2\\\Rightarrow T=\dfrac{4\times 10^{-3}}{1.21}\times 145.2^2\\\Rightarrow T=69.696\ N

Tension is given by 69.696 N

8 0
3 years ago
Many hurricanes during the 2010 season started near the west coast of Africa and moved across the open Atlantic Ocean. What do m
elena-14-01-66 [18.8K]

Answer:

Easterly waves

Explanation:

Easterly is a migratory wavelike disturbance of the tropical easterlies. It is a kind of wave within the broad easterly current which is generally more slowly than the current in which it is embedded.

7 0
4 years ago
Given three resistors of different values, how many possible resistance values could be obtained by using one or more of the res
Tasya [4]

Answer:

8 possible combinations

Assuming R 1, R 2 and R 3 be three different Resistance

1- all three in series

2-all three in parallel

3- R 1 and R 2 in series and parallel with R 3

​

4-R 1 and R 3 in series and parallel with R 2

​

5-R 2 and R 3 in series and parallel with R 1

​

6- R 1 and R 2

in parallel and series with R 3

​

7-R 1 and R 3 in parallel and series with R 2

​

8-R 2 and R 3 in V with R 1

​

7 0
4 years ago
A mixture that appears to contain only one substance is a(an) A. homogeneous mixture. B. heterogeneous mixture. C. compound. D.
finlep [7]
Mixtures that appear to be the same throughout are homogenous mixtures
5 0
3 years ago
Read 2 more answers
An 75-kg hiker climbs to the summit of Mount Mitchell in western North Carolina. During one 2.0-h period, the climber's vertical
Ostrovityanka [42]

Answer:

The change in gravitational potential energy of the climber-Earth system is  \Delta  PE  = 396900 \ J

Explanation:

From the question we are told that

    The mass of the hiker is  m = 75 \ kg

    The time  taken is  T  =  2 \ hr =  2 *  3600 =  7200 \ s

    The  vertical elevation after time  T is  H = 540 \ m

   

The  change  in gravitational potential is  mathematically represented as

         \Delta  PE  =  mgH

here g is the acceleration due to gravity with value  g =  9.8 \ m/s^2  

     substituting values  

        \Delta  PE  =  75  *  9.8  *  540

       \Delta  PE  = 396900 \ J

3 0
3 years ago
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