2. What is the reason for spherometer stands on three legs?​

Answer:

​​In 1954 modern solar cells were invented at Bell Labs with the intent of powering satellites. For many years solar remained expensive but today prices have come down and solar electricity is everywhere. Our satellites and the Mars rover are solar powered, as are homes, toys, outdoor lighting and solar battery packs to charge our electronic devices. Importantly solar electricity is bringing light to the one billion people around the world who live without power. Often these solar lights are replacing kerosene or candles as light sources in the home. Let’s look at some frequently asked questions about solar lights and how they are changing the world.

What are solar lights made of? Solar lights are made up of four main components: the solar photovoltaic (PV) panel, battery, control electronics and the light fixture. When the sun is out, a solar panel takes the light from the sun and produces electrical energy. The energy can then be used immediately or stored in a battery. The goal of most solar lights is to provide power at night, so they will definitely contain a battery, or be capable of attaching to a battery. The battery itself may not need to have a large capacity, due to the availability of solar energy, but it should be long lasting to account for difficulties replacing batteries in many places across the globe.

The advent of the Light Emitting Diode (LED) for the light fixture has drastically reduced the capacity needs of both the solar panels and the batteries. They use significantly less energy than other types of lighting, so the solar panel and battery can be smaller (more transportable and less expensive). The control electronics are required to move the energy around the system, keep the system safe, and potentially switch on or off your light, depending on the level of light it’s exposed to. Solar lights made for outdoor lighting will often turn on automatically when it gets dark outside. Some solar lights made for reading will turn off during daylight hours to preserve the solar charge, but won’t turn on until they are powered on by a user.

How is solar energy produced? Let’s look a little more deeply into the science behind solar electricity. Solar energy is produced due to the photovoltaic effect. A photovoltaic panel (also known as solar cell) converts sunlight into electrical energy. The solar cell is made up of multiple layers of crystalline silicon and chemicals that create layers of negatively-charged electrons and positively-charged spaces. When light passes through the solar cell, it excites the negatively-charged electrons and pushes them into the positively-charged spaces. Those spaces then transfer the electron stream as direct current of electricity through the wires in the solar cell for use or to a battery where the power is stored until it is needed.

Explanation:

Answer: Yes the answer is C

Explanation: Look a pictures of field vectors, they are represented with the arrows.

Answer:

|---20----|

|            |

| 50       |50

|---D--->|

Start      End

Total displacement(D)  20 yards (East).

Explanation:

Answer:

25.48

Explanation:

the earth's gravitational pull is 9.8 m/s. So to find the answer, multiply 2.6 x 9.8

Answer:

Convection and Radiation

Explanation:

Because the sun heats up the earth which cause the warm temperature and you probably know convection heat up the coefficient  and radiation transfer heat electromagnetic or heat LOL

The cause of weather systems on earth is CONVECTION.

This transfer of heat can be calculated as

In conclusion, the cause of weather systems on earth is CONVECTION.

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Answer:

b down

Explanation:

because as she is jumping she is bending her nees so the acceleration is down words

Answer:

b down

Explanation:

Answer:

Explanation:

Part A

Every force has one and only  pair force , according to 3 rd law

It is true , the pair force has equal magnitude .

Part B

The two forces in each pair act in opposite directions.

It is true .

The pair forces are equal and act in opposite direction .

Part C

The two forces in each pair can either both act on the same body or they can act on different bodies.

It is false .

The two forces in each pair can not act on same body  . They act on different bodies , bodies which are undergoing mutual interaction.

Answer:

Explanation:

An N-type semiconductor is a type of material used in electronics. It is made by adding an impurity to a pure semiconductor such as silicon or germanium. The impurities used may be phosphorus, arsenic, antimony, bismuth or some other chemical element. They are called donor impurities

Answer:

48

Explanation:

The formula is d, time t, and speed or rate of travel r is:

d = rt.

We know that d = 120 km and t = 2 hours and 30 minutes = 2.5 hrs.

So you now plug in for d and t to find r, we get:

120 km = r(2.5 hrs)

divide both sides by 2.5 and we get

120 km/2.5 hrs = [r(2.5 hrs)]/2.5 hrs

120 km/2.5 hrs = r(2.5 hrs/2.5 hrs)

48 km/hr = r(1)

r = 48 km/hr

Speed = (distance covered) / (time to cover the distance)

Speed = (120 km) / (2.5 hr)

Speed = (120/2.5) (km/hr)

Speed = 48 km/hr (B)

Answer:

[tex]a=5.51\ m/s^2[/tex]

Explanation:

Given that,

The mass of a bag of acorns, m = 8.5 kg

The force acting on the bag = 80 N

The force of friction = 32 N

We need to find the acceleration of the bag of acorns.

Net force acting on it is = 80 N - 32 N

= 48 N

Let a be the acceleration of the bag of acorns. So,

F = ma

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{48}{8.7}\\\\a=5.51\ m/s^2[/tex]

So, the acceleration of the bag of acorns is [tex]5.51\ m/s^2[/tex].

Answer:

a. 1.642 Ns/m b. 0.0294 N c. 5 × 10⁵ ms

Explanation:

a. Presuming the resistive force R = −bv, what is the value of b (N s/m)?

Using the equation of motion on the object,

W + R = ma where W = weight of the mass = mg where m =mass of marble = 3.00 g = 0.003 kg and g = acceleration due to gravity = 9.8 m/s² , R = resistive force = -bv where v = velocity and a = acceleration of marble.

So,

mg - bv = ma

At terminal speed, a = 0,

So, mg - bvt =m(0)

mg - bvt = 0

mg = bvt

b = mg/vt since terminal speed vt = 1.79 cm/s = 0.0179 m/s

So, b = 0.003 kg × 9.8 m/s²/0.0179 m/s

b = 0.0294 kgm/s² ÷ 0.0179 m/s

b = 1.642 Ns/m

b. What is the strength of the resistive force (N) when the marble reaches terminal speed?

Since the resistive force R = -bv, at terminal speed, vt

R = -bvt

R = -1.642 Ns/m × 0.0179 m/s

R = -0.0294 N

So, its strength is 0.0294 N

(c) How long in milliseconds does it take for it to reach a speed of 0.600vt?

Using mg - bv = ma where a = dv/dt,

mg - bv = mdv/dt

g - bv/m = dv/dt

separating the variables, we have

dv/(g - bv/m) = dt

Integrating, we have

∫dv/(g - bv/m) = ∫dt

(-b/m)/(-b/m) × ∫dv/ (g - bv/m) = ∫dt

1/(-b/m) ∫(-b/m)dv/(g - bv/m) = ∫dt

1/(-b/m) ㏑(g - bv/m) = t + C

㏑(g - bv/m) = -m/bt - mC/b

㏑(g - bv/m) = -m/bt + C'  (C' = -mC/b)

taking antilogarithm of both sides, we have

g - bv/m = exp(-m/bt + C')

g - bv/m = exp(-m/bt)expC'

g - bv/m = Aexp(-m/bt) (A = expC')

bv/m = g - Aexp(-m/bt)

v = mg/b - (Am/b)exp(-m/bt)

when t = 0, v = 0 (since the marble starts from rest)

0 = mg/b - (Am/b)exp(-m/b(0))

0 = mg/b - (Am/b)exp(0))

-mgb = -Am/b

A = g

v = mg/b - (mg/b)exp(-m/bt)

when v = 0.600vt = 0.600 × 0.0179 m/s = 0.01074 m/s

mg/b = 0.003 kg × 9.8 m/s²/1.642 Ns/m = 0.0179 m/s and m/b = 0.003 kg/1.642 Ns/m = 0.00183/s

So,v = mg/b - (mg/b)exp(-m/bt)

0.01074 m/s = 0.0179 m/s - (0.0179 m/s)exp[(-0.00183/s)t]

0.01074 m/s - 0.0179 m/s = - (0.0179 m/s)exp[(-0.00183/s)t]

-0.00716 m/s = - (0.0179 m/s)exp[(-0.00183/s)t]

exp[(-0.00183/s)t] = -0.00716 m/s/-0.0179 m/s

exp[(-0.00183/s)t] = 0.4

taking natural logarithm of both sides, we have

(-0.00183/s)t = ㏑(0.4)

(-0.00183/s)t = -0.9163

t = -0.9163/-0.00183

t = 500 s

t = 500 × 1000 ms

t = 5 × 100000

t = 5 × 10⁵ ms

Answer:

The answer is 6.

90 - (3+9) • 7

90 - (12) • 7

90 - 12 • 7

90 - 84

6

Answer:

16N

Explanation:

Answer:  3.2 kilograms

=================================================

Work Shown:

Apply Newton's Second Law of Motion

F = m*a

8 = m*2.5

2.5m = 8

m = 8/2.5

m = 3.2

The mass is 3.2 kilograms

Answer:

0.54

Explanation:

2.7÷5 = 0.54

Hope this helps!

Answer:

1.241/s

Explanation:

From this question, we have the following information:

Mass of oscillator = 310

The time Period, t = 0.180

Decrease = 20 %

Amplitude of oscillation has the formula

A = Aoe^yt

1-20% = 80%

= 0.80

Y x 0.18 = -ln(0.8)

= 0.18Y = 0.2234

Y = 0.2233/0.18

Y = 1.241/s

The damping constant y is Therefore equal to 1.241s

Answer:

Explanation:

A compound machine is a combination of two or more simple machines.

BRAINLIEST? plz

All four choices are correct responses. (A), (B), (C), (D)

Answer:

This may help

Examples of Newton's third law of motion are ubiquitous in everyday life. For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.

Explanation:

Answer:

(2).........

Explanation:

(2)..........

Answer:

I don't know this for sure, but I think its because they need to be able to sit in their seats without flying in the air.

Explanation:

Because of the centrifugal force he ship must rotate so that passengers feel effects similar to gravity.

''Centrifugal force is force acting on a body performing circular motion, which is along radius of the circle and directed outwards from the center of circle".  Since Centrifugal force acts at right angle to the tangential velocity of the body, there is no displacement in the direction of the force, hence no work done. It has newton(N) as Si unit.

centripetal force is given by,

F= mv²÷r

Where m is mass of the body v is velocity of the body r is radius of circle at which body is moving.

When space ship rotate to the certain angular velocity, centrifugal force will act on each object in the space ship. that force will force the object radially outwards as result all will stuck on the floor and all will experience the feel of gravity.

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#SPJ2.

Answer:

a group of organs working together to perform a function.

Explanation:

Answer:

The more velocity an object has the harder it is to slow it down

Explanation:

slow it down

Answer:

De cual Tema??? jajaja no se que necesitas

Answer:

El análisis temático es un método de análisis de datos cualitativos. Por lo general, se aplica a un conjunto de textos, como las transcripciones de entrevistas. El investigador examina de cerca los datos para identificar temas comunes: temas, ideas y patrones de significado que surgen repetidamente.

Explanation:

Answer:

Explanation:

Time of flight = 2 x u sinα / g where u sinα is vertical component of projectile's velocity u .

So Time of flight = 2 x vertical component / g

vertical component = constant

g is also constant so

Time of flight will also be constant .

It will remain unchanged .

1 Newton force is equal to the 10⁻⁵ dynes. The unit of force will be dyne and the value of force will be 0.1 dynes.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration.

Its SI unit is Newton, MKS unit is kgm/s² and CGS unit is dyne.

The given formulae are;

F = k I l

k is a constant with unit=  N A-1 m-1

I is currently measured in mA = 10⁻³A

l is the length measured in mm= 10⁻³ m

F = k I l

F= N A-1 m-1× 10⁻³A×10⁻³ m

F= 10⁻⁶ N                 ( 1N = 10⁻⁵ dyne)

F= 0.1 dyne

Hence the unit of force will be dyne and the value of force will be 0.1 dynes.

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Answer:

B. It increases

Explanation:

Im sure