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qaws [65]
3 years ago
14

Which choice best explains the definition of a variable?

Physics
1 answer:
Alexandra [31]3 years ago
5 0

Answer:

I don't have the answer but...

Explanation:

A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables.

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Find the acceleration produced.
krok68 [10]

Answer:

0.67m/s²

Explanation:

Given parameters:

Mass of toy  = 1.2kg

Force applied = 0.8N

Unknown:

Acceleration   = ?

Solution:

According to newton's second law of motion;

      Force  = mass x acceleration

Now,

      Acceleration = \frac{Force}{mass}

     Acceleration  = \frac{0.8}{1.2}   = 0.67m/s²

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When a wire loop is connected to a battery, what is produced in the loop?
Vinil7 [7]

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magnetic field

Explanation:

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Is Smoke Abiotic or Biotic?
nlexa [21]

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6 0
3 years ago
An object in space has altitude of 2210 km, velocity of 7000 m/s and flight path angle of 20 degrees. Find the eccentricity, sem
Dmitry [639]

Answer:

Eccentricity = 0.0557

Semi-major axis = 9,095 km

Angular momentum/mass = 60,116 \frac{km^{2} }{Sec}

Kinetic energies/mass = 24,500 KJ

Potential energies/mass = 21,673 KJ

Explanation:

Eccentricity

To find the eccentricity use the following formula

Eccentricity = [ Altitude from the earth x ( Velocity^{2} / Gravitational parameter for the Earth ) ] - 1

Where

Altitude from the earth radius = Radius of the earth + Altitude of the earth from radius = 6,378 km + 2,210 km = 8,588 km

Velocity = 7,000 m/s

Gravitational parameter for the Earth = 3.986004418 × 10^{14}

Eccentricity = ?

Placing values in the formula

Eccentricity = [ ( 8,588 km x 1000 ) x ( 7000^{2} / 3.986004418 × 10^{14}   ) ] - 1

Eccentricity = 0.0557

Semi-major axis

Total Distance = Semi-major axis x ( 1 - Eccentricity )

Where

Total Distance = 8,588 km

Eccentricity = 0.0557

8,588 x 1,000 m = Semi-major axis x ( 1 - 0.0557 )

8,588,000 m = Semi-major axis x 0.9443

Semi-major axis = 8,588,000 m / 0.9443

Semi-major axis = 9,094,567.40 m

Semi-major axis = 9,094.56740 km

Semi-major axis = 9,095 km

Angular momentum/mass

L = MVR

L/M = VR

Where

V = Velocity = \frac{7,000 m/s}{1000} = 7 km/s

R = Total Radius = Radius of Earth + Altitude = 6,378 km + 2,210 km = 8,588 km

Placing values in the formula

L/M = 7 km/s x 8,588 km = 60,116 \frac{km^{2} }{Sec}

Kinetic energies/mass

Ke = I W^{2}

Ke = \frac{1}{2} mr^{2} W^{2} ( Where I = mr^{2} )

\frac{ke}{m} = \frac{r^2}{2} W^{2}

\frac{ke}{m} = \frac{r^2}{2} \frac{V^2}{r^2} ( W^{2} = \frac{V^2}{r^2} )

\frac{ke}{m} = \frac{V^2}{2}

\frac{ke}{m} = \frac{7000^2}{2}

\frac{ke}{m} = 24,500,000 J

\frac{ke}{m} = 24,500 KJ

Potential energies/mass

PE = mgh

\frac{PE}{m} = gh

Where

g = 9.807 \frac{m}{s^2}

h = 2,210 km x 1,000 = 2,210,000 m

Placing values in the formula

\frac{PE}{m} = 9.807 \frac{m}{s^2}  x 2,210,000 m

\frac{PE}{m} = 21,673,470 J

\frac{PE}{m} = 21,673.470 KJ

\frac{PE}{m} = 21,673 KJ

8 0
3 years ago
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