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3 years ago

Interrelationship between health population and environment education and Science and Technology

Physics

1 answer:

S_A_V [24]3 years ago

8 0

Answer:

Answer: Science and technology are relatively modern developments. For most of the past 50,000 years of civilization, there was religion, dogma, ritual an tradition. These kept civilization safe but prevented growth.

After the modern scientific method was developed during the Rennaisance, civil action took off.

Health, as expressed as life expectancies, has increased massively. Population growth has increased to levels thought impossible before. But yes, the environment has suffered.

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A factory has a solid copper sphere that needs to be drawn into a wire. The mass of the copper sphere is 76.5 kg. The copper nee

baherus [9]

Answer:

120.125 m

Explanation:

Density = Mass/volume

D = m/v .............................. Equation 1.

Where D = Density of the solid copper sphere, m = mass of the solid copper sphere, v = volume of the solid copper sphere.

Making v the subject of the equation,

v = m/D............................... Equation 2

Given: m = 76.5 kg,

Constant: D = 8960 kg/m .

Substituting into equation 2

v = 76.5/8960

v = 0.0085379 m³

Since the copper sphere is to be drawn into wire,

Volume of the copper sphere = volume of the wire

v = volume of the wire

Volume of wire = πd²L/4

Where d = diameter of the wire, L = length of the wire.

Note: A wire takes the shape of a cylinder.

v = πd²L/4 ........................ equation 3.

making L the subject of the equation,

L = 4v/πd²..................... Equation 4

Given: v = 0.0085379 m³, d = 9.50 mm = 0.0095 and π = 3.14

Substitute into equation 4

L = 4×0.0085379/(3.15×0.0095²)

L = 0.0341516/0.0002843

L = 120.125 m.

L = 120.125 m

Thus the length of the wire produced = 120.125 m

4 0

3 years ago

01.04 Law of Conservation of Energy <br> science question

mojhsa [17]

Answer:

law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.

5 0

2 years ago

An elevator's electric hoist is rated at 8.0 kW and has an efficiency of 90.0%. The hoist lifts the elevator car, mass 1225 kg,

Nataly_w [17]

Part a)

Power rated on the elevator is given as

$P = 8 kW$

$P = 8 \times 10^3 W$

now the mass that is lifted above is given as

$m = 1225 kg$

height of the elevator lifted is

$h = 9 m$

now the potential energy is given as

$U = mgh$

$U = 1225 (9.8)(9) = 108045 J$

now power is defined as rate of energy

$P = \frac{W}{t}$

$8 \times 10^3 = \frac{108045}{t}$

$t = 13.5 s$

so it will take 13.5 s to lift up

Part b)

Electrical energy used

$efficiency = 90$

$0.90 = \frac{Output}{Input}$

$0.90 = \frac{108045}{Input}$

$Input = 120050 J$

so electrical energy used in this process will be 120050 J

6 0

3 years ago

⚠️⚠️A driver brakes to stop a car in 3.0 s. The car's momentum was 33,000

nlexa [21]

Answer: 11000 N

Explanation:

Given that,

Time required to stop car = 3.0 s

The car's momentum = 33,000

kg m/s

magnitude of force = ?

Recall that impulse is equal to the change in momentum of the car, hence

Impulse (I) = Momentum

(Since I = force x time, then

Force x time = momentum)

F x 3.0 s = 33,000 kg m/s

F = 33,000kg m/s / 3.0s

F = 11,000 N

Thus, 11000N of force was used to stop the car.

3 0

2 years ago

Help Please fast like now!!

defon

Answer: d. availability of places to play

Explanation: I think that it’s d because availability of space to do your physical activity is important. Availabilty of places to play is an environmental factor due to where you decide to play.

7 0

3 years ago

Interrelationship between health population and environment education and Science and Technology​

Interrelationship between health population and environment education and Science and Technology