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Sedaia [141]
3 years ago
6

Both Slicing a tomato and a chemical change has a burning toast cannot be reversed. however, why is slicing a tomato still consi

dering only a physical change?
Physics
2 answers:
nata0808 [166]3 years ago
7 0
Because no new substances appear. A physical change doesn't have to be easily reversible. Crushing a rock into sand, and shattering a mirror, are physical changes.
olchik [2.2K]3 years ago
6 0
Because the tomato did not chemically changed it was only physically altered.

Hope this helps! :D
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The linear expansivity of a metal p Is twice that of metal q. When these metals are heated through the same temperature, their i
Sidana [21]

Answer:0-------0

do we have options?

Explanation:

4 0
2 years ago
The wet density of a gravel was found to be 2.32 Mg/m^3 and the field water content was 16%. In the laboratory, the density of t
Sholpan [36]

Answer:

the relative density of the gravel in the field is 0.7365 or 73.65%

Explanation:

Given that;

wet density of gravel r_{b} = 2.3 Mg/m³

field water content w = 16%

density of solids in lab r_{s} = 2.70 Mg/m³

Maximum void ratio e_{max} = 0.59

Minimum void ratio e_{mini} = 0.28

first we determine the dry density of gravel  r_{d} =  r_{b} / 1+ w

 r_{d} = 2.3 Mg/m³ / 1 + 0.16 = 2.3/1.16 = 1.9827 Mg/m³

we know that;  r_{w} = 1000 kg/m³ = 1 g/cm³

Specific Gravity of soil G = r_{s}  / r_{w}  = 2.70 Mg/m³ / 1 = 2.70 Mg/m³  

eo = ((G×r_{w})/r_{d}) - 1

eo = (( 2.70 × 1) / 1.9827 ) - 1

eo = 1.3617 - 1

Co = 0.3617

so Relative density I_{D} will be;

I_{D} = e_{max}  - eo  / e_{max} - e_{mini}

we substitute

I_{D} = 0.59  - 0.3617 / 0.59 - 0.28

I_{D} = 0.2283 / 0.31

I_{D} = 0.7365 or 73.65%

Therefore;  the relative density of the gravel in the field is 0.7365 or 73.65%

3 0
3 years ago
A 445-N force is used to hold up a Papa Johns sign in place. What is the mass of the sign?
nikitadnepr [17]

Answer:

The mass of the sign is 44.5 kg.

Explanation:

Given that,

Force acting on the sign, F = 445 N

We need to find the mass of the sign.

Net force acting on it is given by :

F = mg

Where g is the acceleration due to gravity

m=\dfrac{F}{g}\\\\m=\dfrac{445\ N}{10\ m/s^2}\\\\m=44.5\ kg

So, the mass of the sign is 44.5 kg.

3 0
2 years ago
Specific Heat and Thermal energy question. 30 points, will give brainliest. Please answer. Pic attached
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Answer:

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Explanation:

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