how many years would it take to reach the star from earth, as measured by observers on the spacecraft

Answer:

The change in momentum = -20000 kg m/s.

Explanation:

Mass m = 1000 kg

speed v₁ = 20 m/s

speed v₂ = 0 m/s

We know that,

The change in momentum

ΔP = m (Δv)

ΔP = m (v₂ - v₁)

     = 1000 (0 - 20)

     = 1000 (-20)

     = -20000 kg m/s

Thus, the change in momentum = -20000 kg m/s.

Note: negative sign indicates that the velocity is reducing when it hits the barrier.

the actual diameter of the object is 1.017×10⁵km

actual diameter, d = any line segment that passes through the center of the circle

angular diameter, θ = the angle that an actual diameter of an object makes.

distance, D= the actual path travel

distance of the object ,D= 1.4 billion = 1.4×10⁹km

angular diameter of an object,θ = 15arc

                            θ  = 15 ×π/ (60×60×180) rad

                                                 [ ∵ 1 revolution = 2π = 360°×60×60]

   Using the relation,

     θ = d/D   {angular diameter = actual diameter/ distance}

     d =  θD

      d =  1.4×10⁹×[15×3.14/(60×60×180) ] km

         =  1.017×10⁵km

This shows the actual diameter of the object is  1.017×10⁵km

It is the physical size of object.

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Computer-enhanced x-rays are called CT scans.

A CT scan is a computer-based technology and refers to the inside image of the body generated by using X-rays and advanced scientific technology.

The image shows detailed information about various body parts including bones, organs, blood vessels, veins, fat, and muscles.

CT scans are more advanced, innovative, and detailed technology compared to standard X-ray techniques.

Experts performing CT scans are known as radiology technologists or radiographers.

It differs from CAT which is the reduced form of Computer Axial Tomography.

The major difference between CT scan and MRI is that CT scan uses X-rays while MRI uses magnetic fields.

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The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers.

A galvanometer measures electric current electromechanically. Early galvanometers were not calibrated, but later models, called ammeters, were, and could measure current flow more precisely.

A galvanometer functions by deflecting a pointer in response to an electric current running through a coil in a steady magnetic field. Galvanometers can be viewed as a particular type of actuator.

The discovery that a magnetic compass needle deflects when near an electric current-carrying wire led to the invention of galvanometers, which was made by Hans Christian rsted in 1820. They were the first tools used to find and gauge minute currents. The apparatus was given the name Luigi Galvani by André-Marie Ampère after the Italian electricity researcher who, in 1791, discovered it.

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By electric flux, the electric field is 41.36 x 10⁵ N/C

We need to know about electric flux to solve this problem. Electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It can be determined as

Φ = E . S = E . Scosθ

where Φ is electric flux, E is electric field, θ is angle of surface and S is surface area.

From the question above, we know that

Φ = 5.20 × 10⁵ N.m²/C

d = 0.4 m²

r = 0.2 m²

because of maximum flux, hence (cosθ = 1)

By substituting the following parameter, we get

Φ = E . Scosθ

5.20 × 10⁵ =E  . π.r²

5.20 × 10⁵ =E . π.0.2²

E = 41.36 x 10⁵ N/C

Hence, the electric field is 41.36 x 10⁵ N/C

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Answer:

theres a mouse lol

no

the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.

Explanation:

Answer:

C. Radio waves have longer wavelengths and lower frequencies than microwaves.

Explanation:

Radio waves and microwaves are both electromagnetic waves. They do not require a medium for their propagation.

These waves are produced as result of the vibration between electric and magnetic fields perpendicular to one another.

Answer:

[tex]a_{moon}=5.84m/s^{2}[/tex]

Explanation:

In order to solve this problem, we will need to draw a free body diagram of both situations (see attached picture).

So first, we need to find what the mass of the object is. We can do so by analyzing the horizontal movement of the first situation, so we get:

[tex]\sum F_{x}=ma[/tex]

F=ma

[tex]m=\frac{F}{a}[/tex]

so

[tex]m=\frac{15N}{6.4m\s^{2}}[/tex]

m=2.34kg

next, we can analyze the second situation, we will start by analizing the vertical movement so we can determine the Normal force, so we get:

[tex]\sum F_{y}=0[/tex]

[tex]N-W=0[/tex]

N=W

N=mg

[tex]N=2.34kg(1.62 m/s^{2}[/tex]

N=3.79N

so now we can analyze the horizontal movement of the block, so we get:

[tex]\sum F_{x}=ma[/tex]

[tex]F-N\mu _{k}=ma[/tex]

[tex]a=\frac{F-N\mu_{k}}{m}[/tex]

[tex]a=\frac{15N-(3.79N)(0.35)}{2.34kg}[/tex]

[tex]a=5.84 m/s^{2}[/tex]

Answer:

0.144

Explanation:

Impulse is defined as force multiplied by time

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Answer:

Winter Solstice

By power transmitted by string, the frequency must be 163.31 Hz.

We need to know about power transmitted to solve this problem. The power transmitted by a  wave on string can be determined by this equation

P = 1/2 . μ . ω² . A² . v

where P is the power, μ is mass per unit length of string, ω is angular speed, A is amplitude and v is wave propagation speed.

the wave propagation can be determined as

v = √(F.l/m)

where F is the string tension, l is length and m is the mass.

From the question above, we know that:

l = 2.7 m

m = 260 g = 0.26 kg

F = 36 N

A = 7.7 mm = 0.0077 m

P = 58 W

Find the mass per unit length

μ = m / l

μ = 0.26 / 2.7

μ = 0.096 kg / m

Find the wave propagation speed

v = √(F.l/m)

v = √(36. 2.7 /0.26)

v = √(373.85)

v = 19.34 m/s

Find the angular speed

P = 1/2 . μ . ω² . A² . v

58 = 1/2 . 0.096 . ω² . 0.0077² . 19.34

ω² = 1053777.29

ω = √1053777.29

ω = 1026.54 rad/s

Find the frequency

ω = 2πf

1026.54 = 2 . 3.14 . f

f = 163.31 Hz

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Answer:

4-12x

Explanation:

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Mars has a thin atmosphere.

Answer:

jaja I don't remember it's been 6 years ago u don't remember nothing of that

Answer:

2m/s

Explanation:

Given parameters:

Mass of car  = 400kg

Momentum  = 800kgm/s

Unknown:

Speed of the car  = ?

Solution:

The momentum of a car is amount of motion it posses;

      momentum  = mass  x velocity

  Insert the parameters and solve;

         800  = 400 x v

             v  = 2m/s

Answer:

E) 800 km/h

Explanation:

The computation of the average vector velocity module of the plane, at that time is shown below:

The displacement vector is

d^2 = d1^2 + d2^2

where,

d1 = northeast displacement

d2 = southeast displacement

Now

d^2 = (120)^2 + (160)^2

= 14400 + 2560

= 40000

= √40000

d = 200 km

Now the average velocity is

V = ΔS ÷ Δt

= 200 ÷ 1 ÷ 4

= 200 × 4

=  800 km/h

Answer:

D: Heat from the water moves into the ice

Answer:

D

Explanation:

Because the molecules of a solid is going to separate form each other because of the hotness of the water and then that’s how the ice cubes would melt

Answer:

19.1 secs

Explanation:

The first step is to calculate the velocity

= 17.4/47.6

= 0.37 m/s

Therefore the time taken for the person to reach the top can be calculated as follows

= 17.4/(0.37+0.541)

= 17.4 / 0.911

= 19.1 secs

Hence the time taken is 19.1 secs

Answer:

A) Mechanical energy is converted into sound and thermal energy when the hands make contact

B) Mechanical Energy used to flip the switch sets off the lever which converts into Electrical Energy. Once the light is turned on, the Electrical Energy is converted into thermal energy, light energy, and a little bit of sound energy.

Answer:

when A and B are travelling opposite directions

Answer:0

Explanation:

All stationary objects have no momentum they do not have any motion to have momentum you need mass and motion

Answer:

Uniform rectilinear movement (m. r. u.)

Explanation:

It is a continuous movement without acceleration, that is, it moves at a constant speed. The speed does not change over time, for this reason, there is no change in acceleration.

Vf = final velocity = 50/30 [km/s] = 1.67 [km/s]

Vo = initial velocity = 50/30 [km/s] = 1.67 [km/s]

Answer:

c. 3/2 mg

Explanation:

Given that the acceleration of an elevator is 1/2 g upward.

The reading on the scale of the elevator is the net external force acting on the elevator.

Let the force F acting on the elevator as shown,

By using Newton's 2nd law, [tex]F_{net}=ma[/tex]

where, [tex]F_{net}[/tex] is the net force acting on the elevator.

m is the mass of the elevator,

a is the acceleration of the elevator, as given a=1/2 g upward.

So, [tex]F_{net}=m\times \frac 1 2 g[/tex]

[tex]F-mg=m\times \frac 1 2 g \\\\F=mg+ \frac 1 2 mg \\\\F= \frac 3 2 mg.[/tex]

So, the reading on the scale in the elevator is [tex]\frac 3 2 mg[/tex].

Hence, option (c) is correct.

Answer:

white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density

Answer:

White noise refers to sounds that mask other sounds that might occur naturally in an environment. If you live in a city, for example, white noise could help block out noises associated with traffic. Specific sounds might be used to help encourage sleep regardless of environmental noises.

Circut C have most electrical power, the product of the voltage and current is highest for circuit C.

Electric Power:

It can be defined as the product of the voltage and current.

P = V x I

For circuit C

P =  4.6 x 0.6 = 2.76

Since, the product of the voltage and current is highest for circuit C.

Therefore, circut C have most electrical power.

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Answer:

6.4 kg

Explanation:

From Newton's second law of motion,

F = ma

or, 63 = m * 9.8

or, 63÷9.8 = m

or, m = 6.4

Answer:

for part 1 the answer is 0.303

Explanation:

To determine the large dimension, always big dimension should be preferred. Hence, option B is correct.

An area, region, or space's length or width in one direction is referred to as a dimension in mathematics. It merely involves taking an object's length, width, and height into account.

Dimension can be expressed in any one of them, such as Length, Breadth, Width, Height, or Depth.

According to the question, the best possible way to express the dimension in 1.04 m* 4.00 m is because both the dimensions are in the same unit, so it will be easy to calculate the dimension and another thing is that all other dimensions in the option are very small, so it will take more time to measure from them because the desk is large.

Hence, measuring with 1.04 m * 4.00 m will be the more convenient and the best way as well.

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