1. Newton's 3rd Law states...
a. Objects in motion stay in motion and objects at rest stay at rest
b. Force is equal to mass times acceleration
c. For each action there is an equal and opposite reaction

Answer:

36111 kg

Explanation:

Given

Force = 65000N

Acceleration = 1.8m/s²

Required

Determine the mass of the elevator

This question will be answered using the following Force formula.

Force = Mass * Acceleration

Substitute values for Force and Acceleration

65000N = Mass * 1.8m/s²

Make Mass the subject

Mass = 65000N/1.8m/s²

Mass = 36111.11 kg

From the list of given options, option E answers the question.

Answer:

SI system - a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country

Explanation:

hope this helps u, sorry if it doesn't.

Answer:

International System of Units (SI), French Système International d'Unités, international decimal system of weights and measures derived from and extending the metric system of units. Adopted by the 11th General Conference on Weights and Measures (CGPM) in 1960, it is abbreviated SI in all languages

Answer:

The angle which the wheel rotates through in 2 seconds is   [tex]\theta =11 \ radians[/tex]

Explanation:

From the question we are told that

    The constant angular acceleration of the wheel is [tex]\alpha = 4.5 rad/s^2[/tex]  

     The initial angular velocity of the wheel is  [tex]w_1 = 1.0 \ rad/s[/tex]

     The time duration considered is  [tex]t = 2.0 \ s[/tex]

Generally from kinematic equation we have that

      [tex]\theta = w_1 t +\frac{1}{2} \alpha t^2[/tex]

=>   [tex]\theta = 1.0 * 2 +\frac{1}{2} * 4.5 * 2^2[/tex]

=>   [tex]\theta =11 \ radians[/tex]

Answer:

the claim is not valid or reasonable.

Explanation:

In order to test the claim we will find the maximum and actual efficiencies. maximum efficiency of a heat engine can be found as:

η(max) = 1 - T₁/T₂

where,

η(max) = maximum efficiency = ?

T₁ = Sink Temperature = 300 K

T₂ = Source Temperature = 400 K

Therefore,

η(max) = 1 - 300 K/400 K

η(max) = 0.25 = 25%

Now, we calculate the actual frequency of the engine:

η = W/Q

where,

W = Net Work = 250 KJ

Q = Heat Received = 750 KJ

Therefore,

η = 250 KJ/750 KJ

η = 0.333 = 33.3 %

η > η(max)

The actual efficiency of a heat engine can never be greater than its Carnot efficiency or the maximum efficiency.

Therefore, the claim is not valid or reasonable.

Answer:

The total thermal energy required  is 8.93 Kcal

Explanation:

Given;

mass of the ice cube, m = 43 g

specific heat capacity of water, Cp = 4.18 J/gc

specific latent heat of fusion of ice, Cf = 334 J/g

First step, determine the heat needed to raise the temperature of the ice from -16.5 °C to 0° C

Q₁ = mCp[0 - (-16.5)]

Q₁ = 43 x 4.18(16.5)

Q₁ = 2965.71 J

Second step, determine the latent heat of fusion of ice at 0°C

Q₂ = mCf

Q₂ = 43 x 334

Q₂ = 14362 J

Third step, determine the quantity of heat required to raise the temperature of the water initially at 0°C to above 11.5 °C of boiling point of water.

The final temperature of the water = 11.5 °C + 100° C = 111.5 °C

Q₃ = mCp Δθ

Q₃ = 43 x 4.18 (111.5 - 0)

Q₃ = 20041 J

Total thermal energy required = Q₁ + Q₂ + Q₃

Total thermal energy required =  2965.71 J + 14362 J +  20041 J

Total thermal energy required = 37,368.71 J

Total thermal energy required = 8.93 Kcal

Answer:

net force

Explanation:

The net force is the vector sum of all the forces acting on an object.

Answer:

357 J

Explanation:

The elastic potential energy of arrow in the stretched bow is 357 J.

The kinetic energy of the arrow after it has been shot is given by half of the product of the arrow's mass and velocity of the arrow.

Here there are no other forms of energy at play here. Only potential and kinetic energy.

As we know that in any system the energy is conserved accordingly the elastic potential energy of the arrow will be equal to the kinetic energy of the bow after it is released i.e., 357 J.

Answer: Example of ground water

Explanation: Groundwater is part of the hydrologic cycle, originating when part of the precipitation that falls on the Earth's surface sinks (infiltrates) through the soil and percolates (seeps) downward to become groundwater.

Answer:

Wavelength

Explanation:

Answer:

200j

Explanation:

The kinetic energy just as it reaches the ground is 200J.

Potential energy is defined as the energy stored within an object that exists as a result of the state, position or arrangement of the object. It is one of the two primary forms of energy while the other is kinetic energy. The stored energy is released when there is a change in the state, position or arrangement of the object.

This is the stored energy which depends upon the relative position of various parts of a system such as a spring has more potential energy when it is compressed or stretched.

Initially the potential energy of the body is 200 J but when it is released, its potential energy is converted into kinetic energy. When the body just touches the ground, the kinetic energy becomes equal to the potential energy.

Thus, the kinetic energy just as it reaches the ground is 200J.

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Answer:

take some sharp mixture of iron spread it from up the magnet you will see the magnetic field of magnet

Answer

The value is  [tex]I = 126000 \ kg \cdot m/s[/tex]

Explanation

From the question we are told that

  The mass of the tank is   [tex]m = 14000 \ kg[/tex]

   The speed is  [tex]u = 9 \ m/s[/tex]

   The duration taken to bring it to a stop is  [tex]\Delta t = 2.5 \ s[/tex]

Generally the impulse that was imparted on the tank is mathematically represented as

         [tex]I = m (u - v )[/tex]

Generally the v is the final velocity of the tank which is  v = 0 m/s , given that it was brought to rest

So

       [tex]I = 14000 (9 - 0 )[/tex]

=>    [tex]I = 126000 \ kg \cdot m/s[/tex]

Impulse is defined as the mass and change of velocity. The magnitude of the impulse was imparted to the tank 126000 Kg m/sec.

The force which acts on the body for a short interval of time is known as the impulsive force. The impulsive force is defined as the product of force and the duration for the force is applied.

It is denoted by I. Its unit is kgm/sec.

m is the mass of the tank =  14000 kg

v is the final speed = 9 m/s

u is the initial speed =0

t is the time interval = 2.5 sec.

The formula for impulse is given as ;

[tex]\rm I=\frac{m(v-u)}{t} \times t \\\\ \rm I=m(v-u) \\\\ \rm I=14000(9-0)\\\\\rm I= 126000 \;kgm/sec[/tex]

Hence the magnitude of the impulse was imparted to the tank 126000 Kg m/sec.

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Answer:

Usually, zeroes are found to the right of a decimal point in significant numbers if you have something like [tex]7\frac{1}{100000000000000000000000000}[/tex] (exaggerated example of course), which is when you have a number that is very very close to the integer before it, but isn't that integer.

Answer:

A boat can travel 2.30 m/s in still water. (a) If the boat points its prow directly across a stream whose current is. ... (a) What is the velocity (magnitude and direction) of the boat relative to the shore? ... The boat's velocity with respect to the shore, , is the sum of its velocity with respect to the water

Explanation:

Answer:

The highest order dark fringe is 2

Explanation:

From the question we are told that

   The wavelength is  [tex]\lambda = 575 \ nm = 575 *10^{-9} \ m[/tex]

    The width is of the slit is  [tex]d = 1410 nm = 1410 *10^{-9} \ m[/tex]

Generally the highest order dark fringe  is mathematically represented as

       [tex]m = \frac{w}{\lambda }[/tex]

=>     [tex]m = \frac{ 1410 *10^{-9}}{ 575 *10^{-9} }[/tex]

=>     [tex]m =2[/tex]

Answer:

c. arrow's push against the bowstring.

Explanation:

Newtons third law of motion describe the relationship between action and reaction forces. Thus when the action force is applied by the bowstring against the arrow, a reaction to this force is supplied by the arrow's push against the bowstring.

If these two forces are not equal and opposite, the arrow would not move as expected. The elastic property of the bowstring propels the arrow at a rate which is due to the potential energy it has gained due to the stretching force.

Answer:

Explanation:

Hydrogen nuclei fuse to form a larger nucleus, and a small amount of mass is converted into energy.

The mass difference between a helium nucleus and four hydrogen nuclei is 0.7%; this mass difference is transformed into energy during the fusion process. Each mole of He42 created as a result of this reaction generates around 3.6 1011 kJ of energy. Thus, option A is correct.

Hydrogen is exhausted during the fusion of hydrogen nuclei, which creates helium and energy. The process's fuel is hydrogen. The star's core condenses and heats up further as the hydrogen is consumed.

For instance, 0.645% of the mass is lost during the fusion of two hydrogen atoms to create helium in the form of electromagnetic radiation or the kinetic energy of an alpha particle. Even those of the lightest element, hydrogen, require a significant amount of energy to get their nuclei to fuse.

Due to this, heavier and heavier elements are encouraged to fuse together, eventually creating all the elements up to iron.

Therefore, Hydrogen nuclei fuse to form a larger nucleus, and a small amount of mass is converted into energy.

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Answer:

False

Explanation:

Answer:

false :3

hope this helps

Answer:

0.5

Explanation:

Answer:

Star Y is showing radial motion

Star Y is moving toward the Earth

Explanation:

Just answered this question on a quiz and got it right.

Star Y is showing radial motion

Star Y is moving towards earth.

Spectrum is defined as the arrangement of radiations emitted by atoms or molecules based on their characteristic wavelength and frequency.

Here,

The spectrum of the star Y is given and is compared to a reference hydrogen spectrum. The range of wavelengths of the star is given. The spectrum of the star shows that the wavelengths are shifted such that from longer wavelengths to shorter wavelength. This phenomenon of shift in wavelengths from higher to lower is known as blue shift. The star shows blue shift that means shifted to shorter wavelength or it can be said as shifted from lower frequency to higher frequency. As a result, it can be concluded that the star Y is moving towards the earth which implies Star Y is showing radial motion.

Hence,

The star Y is showing radial motion.

Star Y is moving towards the earth.

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Answer: your feet are the foundation! Even though all your body parts are connected and affect one another, your feet are what we at Foot Levelers call, the "foundation".

Explanation:

Answer:

This question is incomplete

Explanation:

This question is incomplete because the telescope's focal length was not provided. The formula to be used here is

Magnification = telescope's focal length/eyepiece's focal length

The eyepiece's focal length was provided in the question as 0.38 m.

NOTE: Magnification can be described as the power of an instrument (in this case telescope) to enlarge an object. It has no unit and thus the two focal lengths mentioned in the formula above must be in the same unit (preferably meters since one of them is in meters already).

Answer:

dont die bro

Explanation:

Answer:

Explanation:

The mass of an object can be found by using the formula

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

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{2000}{15} = \frac{400}{3} \\ = 133.3333[/tex]

We have the final answer as

Hope this helps you

Answer:

The power output is  [tex]P = 360 \ W[/tex]  

Explanation:

From the question we are told that

  The potential difference developed is  [tex]V = 450 V[/tex]

  The current is [tex]I = 0.80 \ A[/tex]

  The duration of the pulse is  [tex]\Delta t = 1.0 ms = 1,0 *10^{-3} \ s[/tex]

Generally the power output of the eel during the pulse is mathematically represented as

      [tex]P = V * I[/tex]

=>    [tex]P = 450 * 0.80[/tex]  

=>    [tex]P = 360 \ W[/tex]  

Answer:

The spring constant is 84,810.13 N/m

Explanation:

Given;

applied force on the spring scale, f = 670 N

extention of the spring, x = 0.79 cm = 0.0079 m

Apply Hook's law to determine the spring constant;

f = kx

where;

f is the applied force

k is the spring constant

x is the is the extension

k = f / x

k = 670 / 0.0079

k = 84,810.13 N/m

Therefore, the spring constant is 84,810.13 N/m