Most meteors burn up in the

Answer:

71 % eff

Explanation:

if 50 out of 70  watt goes to making light

50/70 = 71 %

Answer:

1 atm = 1.01E5 nt/m^2 = 1.01E5 pascals

5.05E5 nt/m^2 = 5.05E5 pascals

1 pascal = 1 nt/m^2

(a) The launch angle of the ball is 5⁰.

(b) The actual speed of the ball when it leaves the person's hand is 35.13 m/s.

(c) The maximum height reached by the ball is 0.46 m.

(d) The time spent in air by the ball is 0.26 s.

(e) The horizontal distance traveled by the ball on the road is 4.55 m.

The launch angle of the ball is calculated as follows;

[tex]tan(\theta) = \frac{V_y}{V_x} \\\\\theta = tan^{-1} (\frac{3}{35} )\\\\\theta = 5\ ^0[/tex]

The actual speed of the ball when it leaves the person's hand is calculated as follows;

[tex]V = \sqrt{V_x^2 + V_y^2} \\\\V = \sqrt{(35)^2 + (3)^2} \\\\V = 35.13 \ m/s[/tex]

The maximum height reached by the ball is calulated as follows;

[tex]Vy_f^2 = V_y_i^2 - 2gh\\\\0 = 3^2 - 2(9.8)(h)\\\\19.6h = 9\\\\h = \frac{9}{19.6} \\\\h = 0.46 \ m[/tex]

The time spent in air by the ball is calculated as follows;

[tex]h=V_yt + \frac{1}{2} gt^2\\\\0.46 = 3t + 4.9t^2\\\\4.9t^2 +3t - 0.46 = 0\\\\a = 4.9, \ b = 3, \ c =- 0.46\\\\t = \frac{-b \ \pm \ \sqrt{b^2 - 4ac} }{2a} \\\\t = 0.13 \ s[/tex]

Total time for upward and downward motion  = 2(0.13 s) = 0.26 s

X = Vx(t)

X = 35 x 0.13

X = 4.55 m

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The two pulses will have Constructive interference. Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes.

Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes. Equivalently, the minima of the waves would be aligned

This is an example of a standing wave produced when two ends of a string are oscillated in the same plane. The displacement of of point on two ends oscillates vertically.

We are given that two pulses move along the string each coming towards each other and meet at a common point ( P ).

Each pulse have their own magnitude or displacement in the vertical plane. If the pulses are to meet at a common point at the same instant, then they interfere with each other constructively.

Where constructive interference of two pulses is the addition of magnitudes of induvidual pulses and form a single puls of the constructed magnitude.

magnitude ( New pulse ) = magnitude (Pulse 1) + magnitude (Pulse 2)

Hence the two pulses will have Constructive interference

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Answer:

C

Explanation:

edge 22

Answer:

a person walking upstairs is a wasted energy

Answer:

..........................................................

Explanation:

Answer:

Where are the statements mate?

Answer:

100,000 to 200,000 years to cross the milky way.

Explanation:

where aee the options

for eg .. of simple machine

wheel , screw etc..

Using the idea of work done under gravity, the height of the building is 187 m.

We must recall that the work done in a gravitational field is given by; mgh

m= mass

g = acceleration due to gravity

h = height

mass = 60.0 kg

Workdone = 1.15x10^5 J

W = mgh

h = W/mg

h =  1.15x10^5 J/60.0 kg * 9.8 ms-2

h = 187 m

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Answer:

0.20 Hz

Explanation:

Frequency is the reciprocal of the period. The period is 5 seconds, so the frequency is 1/(5 s) = 0.20 Hz.

The statement 'Not all metals have the same current for a given electric potential' is TRUE. It is conductivity.

All the metals are able to conduct electric currents, but some metals have a higher conductivity.

Metals are able to conduct electric currents due to the free movement of negatively charged particles i.e., electrons, across the conductor.

The band theory of metals states that metals can conduct electrons (e-) in an electric current by means of the help of the e- valence.

The density of free electrons in metals is around 10^28 m-3, which indicates the number of states at a particular energy level that negative e- can occupy.

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(a) The final angular velocity of the flywheel after 3 complete revolutions is 4.96 rad/s.

(b) The time taken for the flywheel to make 3 complete revolutions is 5.93 s.

The final angular velocity of the flywheel after 3 complete revolutions is determined by applying third kinematic equation as shown below;

θ = 2π (rad/rev) x (3 rev) = 18.85 rad

ωf² = ωi² + 2αθ

ωf² = (1.4)² + 2(0.6)(18.85)

ωf² = 24.58

ωf = √24.58

ωf = 4.96 rad/s

The time taken for the flywheel to make 3 complete revolutions is calculated as follows;

ωf = ωi + αt

t = (ωf  - ωi)/α

t = (4.96 - 1.4)/0.6

t = 5.93 s

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Explanation:

Glass is good insulator because of the following reason:

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Glass is considered a good insulator because of its special way its molecules are arranged and its properties.

Glass is not like other solid materials because it doesn't have a regular structure. This messy pattern of atoms in glass makes lots of tiny holes and dirt in the material. Air bubbles and dirt make it harder for heat to move through the glass, so less heat moves through it.

Glass doesn't transfer heat easily because it has low thermal conductivity. Glass does not allow heat to move through it easily and helps to keep heat inside.

Glass does not easily let electricity pass through it. This means that it doesn't let electricity pass through easily. Glass cannot conduct electricity because it does not have any free electrons or mobile charged particles.

Glass allows infrared radiation, which is a type of heat energy, to pass through it. Glass lets light in but stops some heat from getting through.

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Answer:

D

No matter what time of year it is, shadows will remain the same.

Explanation:

Answer:

A

Explanation:

Late in the year the sun the earth is tilted away from the sun that means the sunlight is not coming in as directly. So, shadows during are longer.

Answer:

yea it seems pretty simple.... just follow the instruction

To design an earthquake-resistant structure, we must take several aspects into account, such as materials and construction techniques.

An earthquake-resistant structure is a term that refers to a type of structure that has the characteristic of resisting earthquakes without being destroyed or seriously affected.

Earthquake-resistant structures were developed to prevent tragedies due to the collapse of structures during earthquakes. Generally, to make a structure earthquake resistant, materials are used that resist the movements of the earth without breaking.

The most used materials to make earthquake-resistant structures are:

Additionally, earthquake-resistant structures include specific construction techniques that allow them to arrange materials in a certain way to resist movement.

According to the above, the best option to build a 500 square foot earthquake-resistant structure is a 25-foot-wide by 20-foot-long single-story structure to make it more resistant to earth movements.

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Answer:

no

Explanation:

Answer:

B) sublimation

Explanation:

An example is the vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature.

Answer:

sublimation

Explanation:

sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is the vaporization of frozen carbon dioxide or dry ice(CO2)

or Solid Chlorine (Cl2) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and

temperature relationships.

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Here; f = 450 rev/ min = 450/60 rev/s

f. = 15/2 rev/s

Therefore the angular velocity w. = 2π f•

= 15π rad / sec at t= 10s, w = 0

Therefore Angular acceleration

a=w-w./t

= w + 1/2 at^2

= 15π * 10 - 1/2 (3π/2) 10^2

= 150-75m = 75π rad

Therefore No. of revolution = •/2π = 75/ 2π

= 37.5

Answer:

the light speed up and change it directtions

For a block undergoing simple harmonic oscillation, the maximum amplitude is mathematically given as

a=0.0749m

Generally, the equation for the maximum acceleration is mathematically given as

Ma=A*w^2

Where

A = 0.075 m

Therefore

0.075 * w^2 = 9.8

w = 11.43 rad/s

In conclusion, maximum frequency

mF=w/2pi

mF=11.43/2pi

mF= 1.82 Hz

Where

g=2\pif)^2a

a=(9.8)/4*\pi^2(1.82)^2

a=0.0749m

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