What are challenges faced by both modern and ancient engineers?

Answer:

Medium

Explanation:

I took a test on this last semester.

Answer:

g = 1.62 N/kg

Explanation:

g = GM/r²

  = (6.67 x 10⁻¹¹   x   7.35 x 10²²) / (1738 x 10³)²

  = 1.62 N/kg

Hope this helps!

Answer:

a measure of the amount of information on a storage medium

Density= mass

                volume

it symbol is roh

Explanation:

To find density

we need the mass and volume we have to devide both of the

Answer:

C = frequency × wavelength, where C is the speed of the photons which is the speed of light ~3×10^8

frequency = C/wavelength

f = 3×10^8/400×10^-9m

f = 3/4 × 10^15Hz

f = 0.75×10^15Hz

f = 7.5×10^14Hz

The property of the ball that is constant is acceleration because the rate of it's distance is constant.

Constant acceleration refer to the rate of the velocity of the body that is moving at constant rate or when the rate of change of distance of an object with respect to time is constant.

Therefore, The property of the ball that is constant is acceleration because the rate of it's distance is constant.

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Answer:

Average speed = 2.5 mph

Distance = 22.352 meters

Explanation:

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

You can use this formula for any question like this

The coefficient of kinetic friction between the block and the horizontal surface will be 1.597.

A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.

The given data in the problem is;

μ is the coefficient of kinetic friction=?

m is the mass of the block=10 kg

g is the acceleration due to gravity= 9.81 m/s²

Acceleration of block(a)=20 m/s²

Force (F)= 50 N

θ=30°

There are two forces to act on the block, one is the force directed while the other was the friction force opposing the motion.

From the newton's second law;

F= ma

F-f = ma

Fcos30°- μmg=ma

50cos 30°-μ× 10×9.81 =10 × 20

μ= 1.597

Hence, the  coefficient of kinetic friction will be 1.597.

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Answer:

c. Synaptic transmission

Explanation:

To transmit impulses/electronic signals around the body, nerve cells transfer messages across the synapse and the movement of the chemicals from one cell to the other is known as either diffusion or synaptic transmission.

Answer:

Approximately 2.06⋅108 meters per second.

Explanation:

Answer:

The momentum will quadruple

Explanation:

Original momentum

momen = mv

now increase both

 momen = 2m * 2v = 4 mv  <====== the momentum has quadrupled

All the following are momentum oscillators except Advance/Decline Line.

Momentum oscillators measure the amount that a security's price has changed over a given period of time.

Thus, all the following are momentum oscillators except Advance/Decline Line.

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When the window is closed the heat is trapped inside the classroom which is circulating around the room but when the window is opened, the heat is escaping so most of the heat is escaping rather than circulating the room.

In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in" because of the thermal gradient present between the outside colds air and the warm air present inside the room, as the window gets closed the outside air would not able to extract the thermal energy of the warm air present inside the room.

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

Thermal energy can be produced with help of various means such as by burning fossil fuels, with the help of solar energy.

As given in the problem statement In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in because when the window is closed the cold air from the outside would not be able to extract the heat from the warmed air present inside the room

Thus, the flow of heat would get obstructed by the closing of the window

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The radius of the circle in which the plane is flying is 1887 m.

The aerodynamic lift is the force that keeps the aircraft flying in the air.

Let the  aerodynamic lift be F1 sinθ= mv^2/R ---- (1)

and F1 cosθ= mg --------- (2)

Equating (1) and (2) and eliminating the mass;

R = v^2/ g tanθ

Where v = 490 km/h or 136 m/s

R = (136)^2/9.8 * tan 45

R = 18496/ 9.8

R = 1887 m

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a is the correct answer

Explanation:

no.of proton defines atomic number in an atom

Answer: a

Explanation:

An atomic number is the number of protons found in the nucleus. The number of protons is equal to the number of electrons. The atomic mass the atomic number add the amount of neutrons.

inelastic collision

75.3+60.5=(75+60)v'

225+300=135v'

v'=3.8 m/s

direction = positive = right

Answer:

Usual speed: [tex]500\; {\rm km \cdot h^{-1}}[/tex].

Explanation:

Let the usual duration of the trip be [tex]t[/tex] hours ([tex]t > 0[/tex].) The actual duration of this trip would be [tex](t - (1/2))[/tex] hours.

The usual speed would be:

[tex]\begin{aligned}\frac{1500}{t}\end{aligned}[/tex].

The actual speed would be:

[tex]\begin{aligned}\frac{1500}{t - (1/2)}\end{aligned}[/tex].

The actual speed is [tex]100\; {\rm km \cdot h^{-1}}[/tex] greater than the usual speed. In other words:

[tex]\begin{aligned}\frac{1500}{t - (1/2)} - \frac{1500}{t} = 100\end{aligned}[/tex].

Simplify this equation and solve for [tex]t[/tex] ([tex]t > 0[/tex]):

[tex]\begin{aligned}\frac{15}{t - (1/2)} - \frac{15}{t} = 1\end{aligned}[/tex].

[tex]\begin{aligned}15\, t - 15\, \left(t - \frac{1}{2}\right) = t^{2} - \frac{1}{2}\, t\end{aligned}[/tex].

[tex]\begin{aligned}t^{2} - \frac{1}{2}\, t - \frac{15}{2} = 0\end{aligned}[/tex].

[tex]2\, t^{2} - t - 15 = 0[/tex].

[tex](2\, t + 5)\, (t - 3) = 0[/tex].

Since [tex]t > 0[/tex], the only possible value for [tex]t[/tex] would be [tex]t = 3[/tex].

Thus, the usual duration of this trip would be [tex]3\; {\rm h}[/tex]. The usual speed of this trip would be:

[tex]\begin{aligned}v &= \frac{s}{t} = \frac{1500\; {\rm km}}{3\; {\rm h}} = 500\; {\rm km \cdot h^{-1}}\end{aligned}[/tex].

Answer:

Explanation:

answer: 4 velocity.

if nominal gdp is 1800 and the money supply is 450, then what is velocity?

4 velocity.

If the nominal GDP is 1800 and the money supply is 450, then the velocity of money would be 4.

The total value of goods and services generated in an economy during a given time period, usually a year, is referred to as nominal GDP and is not adjusted for inflation. It depicts what products and services are now selling on the market.

Given:

Nominal GDP, PQ = 1800

Money supply, M = 450

From equation of exchange:

MV = PQ

V = (PQ) ÷ M

V = (1800) ÷ (450)

V = 4

Hence, if the nominal GDP is 1800 and the money supply is 450, then the velocity of money would be 4.

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Answer:

b

Explanation:

It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then the pulley rope is pulled more than 1 meter, but less than 3 meters.

It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then. The correct answer is a. the pulley rope is pulled 1 meter.

When lifting a piano using a pulley system, the distance the pulley rope is pulled will be the same as the distance the piano is lifted. This is due to the mechanical advantage of the pulley, which reduces the amount of effort needed to lift the piano but does not change the distance the rope is pulled.

In a simple single fixed pulley system, where one end of the rope is attached to a fixed point and the other end is used to lift the piano, the distance the pulley rope is pulled will indeed be the same as the distance the piano is lifted.

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Answer:

convection

Explanation:

Answer:

The statements that describe the relationship between history and geography are:

Geography is the setting of the history's story.

Geography plays a role in historic events.

History affects geography, and geography influences history.

The second, third, and the fifth statements are the correct answers.

Explanation:

first 1=2=5=3=0=5=8=7=x=y

The emf of the battery of the given circuit is 18 volts and the current through the 6 ohm resistor is 3A.

In a current carrying conductor, the voltage difference V is directly proportional to the current I through the conductor. The constant is called the resistance R.

i.e V=IR.

Emf of the battery is equal to e = V1 +V2

Current through 2 ohm resistor, I2 = V2 /R

I2 = 12/2

I2 =6 A

Voltage through 1 ohm resistor V1 = I1 R

V1 = 6 x 1 =6 volts

Emf of the battery E = 6+12 =18 volts.

The current  through 6 ohm resistor is

I = 18 /6 = 3 A

Thus, emf of the battery is 18 volts and the current through the 6 ohm resistor is 3A.

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Answer:

B and D

Explanation:

A is wrong because objects with mass have gravity and the Earth and Sun both have mass. As we know, the Earth orbits around the Sun and the reason si because gravity.

B is corrects because throughout the whole universe there are objects like planets and meteors and more. All these objects have gravity because they have mass.

C Gravity pulls things together that is why we are on Earth and not pushed away into space.
D is correct, using Sun and a meteor. When a meteor comes within the gravity range of the sun, the sun pulls the meteor toward it. Without anything around the sun, nothing happens because there is nothing to pull.

Answer:

90 km/hr

Explanation:

AVERAGE is 60 km/hr  so   120 km / 60 km/hr = 2 hours total

first 30 km / 30 km / hr = 1 hour   used    1 hour left

  now there is 90 km to cover in the second hour

         so that must be   90 km/hr

Climate change is the reason for a lot of factors such as:

Heat-trapping Greenhouse Gases And The Earth's Climate

Greenhouse Gases

Reflectivity or Absorption of the Sun's Energy

Changes in the Earth's Orbit and Rotation

Variations in Solar Activity

Changes in the Earth's Reflectivity

Volcanic Activity

There's a lot more that I could list, but hopefully this will do.

Answer:

the answer is 2321 watts

Explanation:

power= energy/time

power= 441/0.19=2321.05watts

Answer:

number of moles of gas.

Explanation:

Answer:

Ampere

Explanation:

The SI unit of electric current is Ampere (A) after French physicist Andre Ampere who discovered electrical current

The planets of the solar system has the orbiting time.

Mercury-  88 days, Venus-225 days, Earth- 365 days, Mars-687 days, Jupiter- 12 years, Saturn- 29 years, Uranus-  84 years, Neptune- 165 years, Pluto- 248 years.

Solar system consists of all the planets and the most importantly the center of the solar system is Sun.

Sun is the main focus of the solar system. It emits high temperature light rays on the planets which in turn emit lights and be visible.

Outer planets take longer to orbit the sun because the gravitational pull is weaker as shown in the inverse square law.

The outer planets very far away from the Sun, means that they have more distance to cover in their orbit.

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