All categories

3 years ago

LESSION 7:LIGHT UNIT TEST

Physics

2 answers:

Ksivusya [100]3 years ago

4 0

Answer:

I cheated on

Spanish

ELA

history

Explanation:

Tju [1.3M]3 years ago

4 0

Answer:

thx

Explanation:

You might be interested in

A model airplane with a mass of 0.741kg is tethered by a wire so that it flies in a circle 30.9 m in radius. The airplane engine

Tju [1.3M]

Answer:

$_T}=24.57Nm$

ω = 0.0347 rad/s²

a ≅ 1.07 m/s²

Explanation:

Given that:

mass of the model airplane = 0.741 kg

radius of the wire = 30.9 m

Force = 0.795 N

The torque produced by the net thrust about the center of the circle can be calculated as:

$_T } = Fr$

where;

F represent the magnitude of the thrust

r represent the radius of the wire

Since we have our parameters in set, the next thing to do is to replace it into the above formula;

So;

$_T}=(0.795)*(30.9)$

$_T}=24.57Nm$

(b)

Find the angular acceleration of the airplane when it is in level flight rad/s²

$_T}=I \omega$

where;

I = moment of inertia

ω = angular acceleration

The moment of inertia (I) can also be illustrated as:

$I = mr^2$

I = ( 0.741) × (30.9)²

I = 0.741 × 954.81

I = 707.51 Kg.m²

$_T}=I \omega$

Making angular acceleration the subject of the formula; we have;

$\omega = \frac{_T}{I}$

ω = $\frac{24.57}{707.51}$

ω = 0.0347 rad/s²

(c)

Find the linear acceleration of the airplane tangent to its flight path.m/s²

the linear acceleration (a) can be given as:

a = ωr

a = 0.0347 × 30.9

a = 1.07223 m/s²

a ≅ 1.07 m/s²

5 0

3 years ago

Pressure is about 1000 hPa at sea level and about 500 hPa at an altitude of 5.5 km. Why doesn’t this vertical pressure gradient

saul85 [17]

Answer:

A. The upward pressure gradient force is balanced by gravity.

Explanation:

A. is correct because the pressure difference is actually generated by gravity. As in the following formula for the pressure at different points:

$p = p_0 + \rho g h$

where $p, p_0$ are the pressure at 2 points, ρ is the density of the fluid, g is the gravitational constant, and h is the height difference.

B is incorrect because friction in air is too small to make an effect.

C is incorrect because the Coriolis force is horizontal, not vertical.

D is incorrect because a difference of 500 hPa = 50000 Pa, this is half of the atmospheric pressure.

E is incorrect because temperature cannot generate force.

6 0

3 years ago

A cement factory emits 900 kilograms of CO2 to produce 1,000 kilograms of cement. A fully grown tree removes six kilograms of CO

Dmitriy789 [7]

<h3>Answer;</h3>

To make the factory carbon neutral, the owners need to grow 15000 trees over an area of land measuring 75 acres

<h3>Explanation and solution;</h3>

From the information;

900 kg CO2 = 1000 kg Cement

1 tree = 6 kg CO2

1 acre = 200 trees

100000 kg Cement will require;

=(900 × 100000)/1000

= 90,000 kg of CO2

But 1 tree = 6 kg of CO2

Number of trees = 90,000/6

= 15,000 trees

But, 1 acre = 200 trees

Number of acres = 15,000/200

= 75 acres of land

Therefore;

To make the factory carbon neutral, the owners need to grow 15000 trees over an area of land measuring 75 acres

6 0

3 years ago

Read 2 more answers

Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists beli

djverab [1.8K]

I think the correct answer from the choices listed above is the first option. The statement that best accounts for these different opinions would be that scientists propose contradictory ideas to include all possibilities. Hope this answers the question. Have a nice day.

5 0

3 years ago

Read 2 more answers

In a thundercloud there may be an electric charge of 24 C near the top of the cloud and −24 C near the bottom of the cloud. If t

lidiya [134]

Answer:

Electric force, $F=1.29\times 10^6\ N$