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djyliett [7]
4 years ago
8

Which unit measures mass?

Physics
2 answers:
Damm [24]4 years ago
4 0
Your answer is B

a kilogram measures Mass
have fun :)))

Assoli18 [71]4 years ago
3 0
Kilogram measure mass
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what is the focalength of the combination of two thin renses of power -5D and -2D placeci in contact with each other?​
Ghella [55]

Answer:

f = - 0.143 m = - 14.3 cm

Explanation:

First, we will calculate the power of the combination of lenses:

P = P₁ + P₂

where,

P = Power of Combination = ?

P₁ = Power of first lens = - 5D

P₂ = Power of second lens = - 2D

Therefore,

P = - 5D - 2D

P = - 7D

Now, the focal length can be given as:

f = \frac{1}{P} \\\\f = \frac{1}{-\ 7\ D} \\\\

<u>f = - 0.143 m = - 14.3 cm</u>

Negative focal length indicates that combination will act as diverging lens.

6 0
3 years ago
What is it that lives if it is fed, and dies if you give it a drink?
Anna71 [15]

Fire is it that lives if it is fed, and dies if you give it a drink.

<h3><u>Explanation:</u></h3>

Fire is very essential part of human life. It is used for cooking food and for other important activities. Without fire we cannot not survive. Something or the other should be heated before consumption and this can be achieved only with fir. It is also used in the darker places for viewing many things around us.

Thus, fire can survive if we give fuel or any wooden pieces and when water is poured on it it will turn off. Hence Fire is the one that survives when it is fed and dies when water is given as a drink to it.

4 0
3 years ago
You obtain a spectrum of an object in space. The spectrum consists of a number of sharp, bright emission lines. Is this object a
Andreyy89

Answer:

In hot gases , the atoms keeps colliding with each other and sometimes the energy liberated during collision takes the electron to a higher level,thus, .The object is a cloud of hot gas and finally the electron returns back emitting photon

6 0
4 years ago
Read 2 more answers
The rate at which a metal alloy oxidizes in an oxygen-containing atmosphere is a typical example of the practical utility of the
Ray Of Light [21]

Answer:

The activation energy is  Q = 328.31 \ K J/mol

Explanation:

From the question we are told that

      The rate constant is  k

       at the temperature T_1  = 300 =  300 + 273 =  573 \ K

      The value of k is  k_1 = 1.05 *10^{-8} \  kg /m^4 \cdot s

      at temperature T_2 = 400 ^oC =  400 + 273 =  673 \ K

       The value of  k is  k_2 = 2.95 *10^{-4} \ kg /m^4 \cdot s

The rate constant is mathematically represented as

       k  =  Ce^{- \frac{Q}{RT} }

Where Q is the activation energy

         R is the ideal gas constant with a value of  R =  8.314 \ J /mol \cdot K

          C is a constant

           T is the temperature

For the first  rate constant

       k_1 = Ce ^{-\frac{Q}{RT_1} }

For the second   rate constant

       k_2 = Ce ^{-\frac{Q}{RT_2} }

Now the ratio between the two given rate constant is  

      \frac{k_1 }{k_2}  =  e^{(\frac{Q}{R} [\frac{1}{\frac{T_2 - 1}{T_1} } ] )}

  =>    ln [\frac{k_1}{k_2} ] =  \frac{Q}{R}  * [\frac{1}{\frac{T_2 -1}{T_1} } ]

substituting values  

       ln [\frac{1.05 *10^{-8}}{2.95 *10^{-4}} ] =  \frac{Q}{8.314}  * [\frac{1}{\frac{673 -1}{573} } ]

=>     Q = 328.31 \ K J/mol

7 0
3 years ago
4. Paper is solid in packets labelled 80 g/m2. This means that a sheet of paper of area
ira [324]

Answer:

Option C. 0.73 g/cm³

Explanation:

From the question given above, the following data were obtained:

Mass = 80 g

Area (A) = 10000 cm²

Thickness = 0.11 mm

Density =?

Next, we shall convert 0.11 mm to cm. This can be obtained as follow:

10 mm = 1 cm

Therefore,

0.11 mm = 0.11 mm × 1 cm / 10 mm

0.11 mm = 0.011 cm

Thus, 0.11 mm is equivalent to 0.011 cm.

Next, we shall determine the volume of the paper. This can be obtained as follow:

Area (A) = 10000 cm²

Thickness = 0.011 cm

Volume =?

Volume = Area × Thickness

Volume = 10000 × 0.011

Volume = 110 cm³

Finally, we shall determine the density of the paper. This can be obtained as follow:

Mass = 80 g

Volume = 110 cm³

Density =?

Density = mass / volume

Density = 80 / 110

Density = 0.73 g/cm³

Therefore the density of the paper is 0.73 g/cm³

3 0
3 years ago
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