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Vanyuwa [196]
3 years ago
15

Velocity is speed in a certain direction. True False

Physics
2 answers:
lara [203]3 years ago
6 0
True if you look up the question Is velocity speed in a certain direction you would’ve gotten the answer but I’m pretty sure it’s true
kvasek [131]3 years ago
3 0
The answer is true.
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How much water
nevsk [136]

Answer:

The mass is  m  =  3.75 \  kg

Explanation:

From the question we are told that

     The initial temperature is  T_1 =  15^oC

      The final  temperature is  T_2 =  100 ^o C  \ (boiling point )

Generally the maximum heat produced by  1  Liter   of  natural gas is  9000 \ cal

 So the amount of heat produced by 100 L is  

              E = 9000 * 100

=>           E = 9000 00 \  cal

Generally given that the efficiency is  \eta =  0.35

Then actual heat received by the water is

         H  =  0.35 *  E

=> H  =  0.35 *   9000 00

=> H  =  315000 \  cal

Converting to kcal  

=> H  =  315000 \  cal = \frac{315000}{1000} =  315 \ kcal

Generally the specific heat of water is  

       c_w  =  1 kcal/ kg \cdot ^oC

Generally the heat received by the water is mathematically represented as

       H  =  m *  c_w  *  (T_2 - T_1)

=>     315  =  m *  1   *  ( 100  - 15 )

=>     m  =  3.75 \  kg

     

6 0
3 years ago
Which of these items would be a renewable resource?
Irina18 [472]
Trees can be a renewable source , we use them to breath , we make paper out of them , we make houses and etc.

i hope this helps
8 0
3 years ago
A car with an initial velocity of 5.0 is acelerated at 3.0for 4.0seconds what os the velocity of tje car ofter the 4.0seconds
sasho [114]
Vf =Vi+at
Vf= 5 + 3*4
Vf=5+12
Vf=17m/sec
6 0
3 years ago
A rock dropped on the moon will increase it's speed from 0 m/s to 8.15 m/s in about 5 seconds what is the acceleration of the ro
Lunna [17]

Using the formula:


a = (Vf - Vi) / t


Our initial velocity is 0 m/s, and our final velocity is 8.15 m/s, with a time period of 5 seconds:


a = (8.15 - 0.0) / 5

a = 1.63 m/s^2


If you know the acceleration due to gravity on the Moon, you can confirm this answer. The recorded gravitational acceleration on the Moon is 1.62 m/s^2.

5 0
3 years ago
A long, straight wire is surrounded by a hollow metal cylinder whose axis coincides with that of the wire. The wire has a charge
Alexxx [7]

Explanation:

It is given that, a long, straight wire is surrounded by a hollow metal cylinder whose axis coincides with that of the wire.

The charge per unit length of the wire is \lambda and the net charge per unit length is 2 \lambda.

We know that there exist zero electric field inside the metal cylinder.

(a) Using Gauss's law to find the charge per unit length on the inner and outer surfaces of the cylinder. Let \lambda_i\ and\ \lambda_o are the charge per unit length on the inner and outer surfaces of the cylinder.

For inner surface,

\phi=\dfrac{q_{enclosed}}{\epsilon_o}

E.A=\dfrac{q_{enclosed}}{\epsilon_o}

0=\dfrac{\lambda_i+\lambda}{\epsilon_o}

\lambda_i=-\lambda  

For outer surface,

\lambda_i+\lambda_o=2\lambda

-\lambda+\lambda_o=2\lambda

\lambda_o=3\lambda

(b) Let E is the electric field outside the cylinder, a distance r from the axis. It is given by :

E_o=\dfrac{\lambda_o}{2\pi \epsilon_o r}

E_o=\dfrac{3\lambda}{2\pi \epsilon_o r}

Hence, this is the required solution.

6 0
3 years ago
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