who was first person who envisaged a telescope to see the objects far away​

Answer:

[tex]v=0m/s[/tex]

Explanation:

From the question we are told that

Mass of object[tex]M=10kg[/tex]

Amplitude[tex]A=0.10m[/tex]

SHM [tex]w=2.0 times per second.[/tex]

Distance from equilibrium [tex]0.10m[/tex]

Generally the equation for SHM displacement from equilibrium position is mathematically given by

[tex]v=Aw\sqrt{1-\frac{x^2}{A^2}}[/tex]

For [tex]x=0.10[/tex]

Therefore

[tex]v=Aw\sqrt{1-\frac{0.10^2}{A^2}}[/tex]

[tex]v=0.10*2\sqrt{1-\frac{0.10^2}{0.10^2}}[/tex]

[tex]v=0.10*2\sqrt{1-1}[/tex]

[tex]v=0m/s[/tex]

Explanation:

Given. Required

wo = 400N. MA=?

wi = 50N

Solution

MA = wo = 400N =8

wi. 50N

Answer:

earth

Explanation:

its the only planet.

Answer: Did you get the answers to any of this report?

Explanation:

Answer:

1 year later and still not answered....

Explanation:

Answer:

D) Cells come from preexisting cells.

Explanation:

The universal i.e widely accepted cell theory was proposed in 1800's by the contribution of three scientists namely Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. They came together and proposed three main components that make up the cell theory today. The components are:

- All living things are composed of one or more cells.

- Cell is the basic and fundamental unit of life

- All cells come from preexisting cells.

Based on these three components of the cell theory, the statement that: "Cells come from preexisting cells" in the options is correct.

C. Paramedic for a fire department

A Paramedic for a fire department is the type of employee would most likely spend the majority of work time in a vehicle. Hence, option C is correct.

putting out fires in their vicinity. preserving property and life in the event of localized flames. saving and safeguarding individuals in the event of a car accident, as well as in the event of other catastrophes.

An institution that offers services for fire prevention and suppression is known as a fire department or fire brigade. It is also sometimes referred to as a fire authority, fire district, fire and rescue, or fire service.

The name used in contemporary legislation and by government agencies for this is a fire and rescue service.

Thus, option C is correct.

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Answer:

Explanation:

We shall apply law of conservation of momentum .

M and m be mass of man and boat . V and v be velocity of man and boat .

MV = mv

75 V = 30 v

2 .0 m/s is relative velocity of man wrt boat .

Given v + V = 2

V = 2 - v

75 ( 2 - v )  = 30 v

150 - 75 v = 30 v

150 = 105 v

v = 1.43 m /s

The electromagnetic waves are determined by the wavelength. Hence, the correct option is D.

Electromagnetic waves are made up of vibrating electric and magnetic fields. The electric and magnetic fields are mutually perpendicular to each other. EM waves are transverse in nature.

Electromagnetic waves can travel through the vacuum in the form of radiation. The EM waves travel with the speed of light 3×10⁸ m/s. EM waves have no mass and charge. These waves can carry energy in space.

The behavior of electromagnetic waves depends on its frequency and wavelength. EM waves are classified into 7 types based on its frequency and wavelength. They are classified from radio waves to  Gamma rays.

Frequency is inversely proportional to wavelength, f = c / λ. Higher frequencies have shorter wavelength and lower frequencies have longer wavelength.

Thus, the wavelength determines the radiation that an electromagnetic waves. Hence, the option D is correct.

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Answer:

The force applied to a spring equals the product of the spring constant and the displacement.

Explanation:

From Hooke's law, the force required to extend or compress a spring by a distance is proportional to the distance. This means extension is proportional to force.

Mathematically it is stated as;

F= -k*x  where k is the spring constant and x is the displacement of the spring after adjustment.

Hooke's law is an example of elasticity property of a material which is the ability of the object to return to a normal shape after experiencing a distortion also called "restoring force"

Answer:

Option A

Explanation:

We can change a gas to liquid by decreasing the temperature and increasing the pressure.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every element and substance has a precise range of temperatures and pressures at which it can change from one phase to another.

Each substance can transform into one of three phases: solid, liquid, or gas. At specific temperatures, every substance is in one of these three phases. The intermolecular forces acting on the material's molecules and atoms have a significant impact on the temperature and pressure at which the substance will change.

When we change a gas to liquid, we have to decrease in the temperature and increase in the pressure for this phase transition.

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Answer:

Loop of Wire

Explanation:

Answer:

No

Explanation:

Cereal is cereal and soup is soup.

Answer:

v = 15.23 m/s

Explanation:

Given that,

Mass of a car, m = 1110 kg

Initial velocity, u = 21 m/s

Force,F = -8000 N

Time, t = 0.9 s

We need to find the final velocity of the car.

Force, F = ma

[tex]F=\dfrac{m(v-u)}{t}\\\\v-u=\dfrac{Ft}{m}\\\\v=\dfrac{Ft}{m}+u\\\\v=\dfrac{-8000\times 0.8}{1110}+21\\\\v=15.23\ m/s[/tex]

So, the final velocity of the car is 15.23 m/s.

Answer: The Answer is B (Sorry if this is late)

Explanation:

I couldn’t find the answer to the question myself then found you, with no answer. So I guessed and failed my third question of the quiz, you were worth the sacrifice though ✨

The pair of waves could overlap to produce a wave with a higher amplitude through interference is that two waves of the same amplitude with crests that are perfectly aligned. Hence, option B is correct.

The maximum deflection or distance made by a point on even a vibrating object or wave relative to its equilibrium location is known as the amplitude in physics. It is equivalent to the length of a vibration path divided in half.

A pendulum's amplitude is therefore equal to the distance that the bob travels when swinging through one side to another. Vibrating sources produce waves, whose amplitude is inversely proportional to the source's amplitude.

The largest deviation of any place on the string out of its place when the line is at rest is used to determine the amplitude of a wave propagation, like the wave on such a plucked string.

Therefore, it concludes that option B is correct.

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One revolution of the propeller corresponds to a rotation of 2π radians, so that the propeller has an initial angular velocity of

10 rev/s = (10 rev/s) • (2π rad/rev) = 20π rad/s

The propeller thus has an angular velocity ω at time t of

ω = 20π rad/s - (2.0 rad/s²) t

so that at t = 40 s, its angular speed is reduced to

20π rad/s - (2.0 rad/s²) (40 s) = (20π - 80) rad/s

Convert this to a rotation rate by dividing this result by 2π :

(20π - 80) rad/s = ((20π - 80) rad/s) • (1/(2π) rev/rad) ≈ -2.73 rev/s

which would suggest that the propeller has started to turn in the opposite direction at a rate of 2.73 rev/s.

Answer:

D. Electromagnetic Induction.

Explanation:

Answer:Energy cannot be created or destroyed. It can be stored, or it can be transferred i.e. from a hot object to a cool object by conduction, convection or radiation.

Explanation:

Answer:

If you haven't heard, Joe Biden would like to unite America.

It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."

The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."

If only it were that easy.

When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.

It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.

Explanation:

btw i would rather have him as president

Answer:125 J

Explanation:

Given

Mass of block [tex]m=10\ kg[/tex]

Initial velocity [tex]u=0\ m/s[/tex]

Final velocity [tex]v=5\ m/s[/tex]

According to the work-energy theorem, work done by all the forces is equal to the change in kinetic energy.

As the block is on the horizontal surface so, the work done by gravity is zero.

Work(W)=change in kinetic Energy

[tex]W=\dfrac{1}{2}m[v^2-u^2]\\W=\dfrac{1}{2}\times 10\times [5^2-0^2]=125\ J[/tex]

Answer:

7.68m/s

Explanation:

At point A, height h= 0m where v=?

At point B, height of h = 3.01 m above the top of the ramp v= 0 m/s

The conservation of energy here will be energy at Point A equals energy at point B

g= acceleration due to gravity= 9.81m/s^2

(mgh + 1/2 mv^2)A = (mgh + 1/2 mv^2)B

✓But height h at point A= 0 m then energy at point A= 1/2 mv^2

✓At point B , the velocity v= 0 m/s, then Energy at point B= mgh

✓ if we equate both energy at point A and B we have

mgh=1/2 mv^2

Let us make v the subject of formula, and cancel out the "m"

v=√2gh

Then substitute the values

V= √2×9.81×3.01

V=7.68m/s

Hence, his initial speed (in m/s) at point A is 7.68m/s

We know that,

[tex]{\boxed{\sf{v=u+gt}}}[/tex]

[ Put values ]

[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]

Therefore, the time at which the stone reaches its maximum height will be 2.04 s.

Answer:

the power of the lamp is 100 Watts

step by step explaining:

work done = energy consumed by the lamp = 100J

time = 10 seconds

power = 100 / 10 = 100J - 1 = 100w

[tex] \bf \underline{ \underline{Given}}[/tex]

[tex] \bf \underline{ \underline{To \: find \: out}}[/tex]

Calculate the power of lamp.

[tex] \bf \underline{ \underline{Solution}}[/tex]

Formula of power is work done divide by time taken.

[tex] \boxed{ \bf \: Power = \frac{work}{time} }[/tex]

[tex] \blue \bigstar \bf \: Putting \: the \: given \: values[/tex]

[tex] \implies \bf Power = \cancel \dfrac{1000}{10} [/tex]

[tex] \implies \bf \: Power = 100 \: watt[/tex]

Answer:

30 m

Explanation:

Let's list out the known variables that we are given in this question.

We are trying to solve for displacement in the x-direction.

Find which constant acceleration equation contains all 4 of these variables.

Plug the known values into the equation and solve for delta x.

The car goes 30 m after the driver begins to brake.

Answer:

the answer should be 30 m

Explanation:

have a good day

Answer:

Yes, because the wrench is moving at the same speed as the sailboat.

The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,

This difference in paths lead to the relativistic change in lengths.

Answer:

Sample Response: If temperature and surface area increase, then the time it takes for sodium bicarbonate to completely dissolve will decrease, because increasing both factors increases the rate of a chemical reaction.

Explanation:

Answer:

$v_f = = 7.9 \times10^3 \text{ m/s }$

Answer:

Explanation:

The acceleration of an object is given by the formula

a = v²/r

The acceleration of the object is bound to increase, if and only if the following are changed as well.

The mass of the object is increased,

The speed of the object is increased,

The radius of the object is contrarily decreased

Taking another look at the formula, we see that if we increase the speed of the object, it increases the acceleration. And since the radius is in the denominator, it has to be reduced for the acceleration to increase

Answer:

Broken glass

Explanation:

By balancing the force, we get :

100 - Frictional Force = ma

100 - μmg = ma

100 - μ(5)(10) = (5)(15)

50μ = 25

μ = 0.5  

Distance travelled by box in 5 seconds is :

[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]

Hence, this is the required solution.