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Shalnov [3]
3 years ago
13

What is the volume of a cube whose side is 10 cm?

Physics
2 answers:
anyanavicka [17]3 years ago
6 0

the first one Is right answer

Rasek [7]3 years ago
5 0

<u>Answer:</u> The volume of the cube is 10^{-3}m^3

<u>Explanation:</u>

To calculate the volume of cube, we use the formula:

V=a^3

where,

a = edge length of cube = 10 cm = 0.1 m     (Conversion factor: 1 m = 100 cm)

Putting values in above equation, we get:

V=(0.1)^3=0.001m^3=10^{-3}m^3

Hence, the volume of the cube is 10^{-3}m^3

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A plane has a mass of 360,000 kg takes-off at a speed of 300 km/hr. i) What should be the minimum acceleration to take off if th
melomori [17]

Answer:

i) the minimum acceleration to take off is 22500 km/h²

ii) the required time needed by the plane from starting to takeoff is 0.0133 hrs

iii) required force that the engine must exert to attain acceleration is 625 kN

Explanation:

Given the data in the question;

mass of plane m = 360,000 kg

take of speed v = 300 km/hr = 83.33 m/s

i)

What should be the minimum acceleration to take off if the length of the runway is 2.00 km

from Newton's equation of motion;

v² = u² + 2as

we know that a plane starts from rest, so; u = 0

given that distance S = 2 km

we substitute

(300)² = 0² + ( 2 × a × 2 )

90000 = 4 × a

a = 90000 / 4

a = 22500 km/h²

Therefore,  the minimum acceleration to take off is 22500 km/h²

ii) At this acceleration, how much time would the plane need from starting to takeoff.

from Newton's equation of motion;

v = u + at

we substitute

300 = 0 + 22500 × t

t = 300 / 22500

t = 0.0133 hrs

Therefore, the required time needed by the plane from starting to takeoff is 0.0133 hrs

iii) What force must the engines exert to attain this acceleration

we know that;

F = ma

acceleration a = 22500 km/hr² = 1.736 m/s²

so we substitute

F = 360,000 kg × 1.736 m/s²

F =  624960 N

F = 625 kN

Therefore, required force that the engine must exert to attain acceleration is 625 kN

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3 years ago
Mass of water= 357g density water= 1.0g/cm3
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Answer:

W = 250(50) = 12500 J

Explanation:

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In which direction does the sun appear to move across the sky
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