what is weight?how can we measure it



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Answer:

.0612 kg

Explanation:

I think your spec heat for lead should be   128 j /kg-K

Final lead temp is the same as the water 25 C   Note that 1 K = 1 C degree

 so lead goes from 45 to 25 C     (or difference of 20 K)

Heat given up by the lead =

.5 kg * (20 K)  * 128 j/ kg -C   = 1 280  j

this heat is GAINED by the water going from 20 to 25  C

x kg * (5 C ) (4186  j/kg-C )  = 1 280  j  

x = .0612 kg

Answer:

number d

Explanation:

because plant need carbondioxide

Answer:

4 m/s

Explanation:

v=u+ at  and  v^2=u^2+2as.

It is given that  v=0,t=5  s    and  s=10  m.

⇒0=u+5a  and  0=u^2+20a.

⇒a=−u/5  and  a=−u^2/20.

⇒u/5 = u^2/20⇒u=4  m/s.

⇒  The initial velocity is  4  m/s.

The planets of the solar system has the orbiting time.

Mercury-  88 days, Venus-225 days, Earth- 365 days, Mars-687 days, Jupiter- 12 years, Saturn- 29 years, Uranus-  84 years, Neptune- 165 years, Pluto- 248 years.

Solar system consists of all the planets and the most importantly the center of the solar system is Sun.

Sun is the main focus of the solar system. It emits high temperature light rays on the planets which in turn emit lights and be visible.

Outer planets take longer to orbit the sun because the gravitational pull is weaker as shown in the inverse square law.

The outer planets very far away from the Sun, means that they have more distance to cover in their orbit.

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Answer:

B temperature and dew point temperature

Answer:

1080 Newtons

Explanation:

F = m * a

F = 240kg * 4.5 m/s

F = 1080

The speed of an electromagnetic wave traveling through the air will be 2.9 ×10⁸ m/sec.

The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.

The refractive index is found as;

[tex]\rm n= \frac{c}{v} \\\\ 1.000293=\frac{3 \times 10^8}{v} \\\\ v=2.9 \times 10^8 \ m/sec[/tex]

Hence, the speed of an electromagnetic wave traveling through the air will be 2.9 ×10⁸ m/sec.

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Answer:

C

Explanation:

Dendrimers are the form of nanotechnology is most likely to help improve brain imaging.

Nanotechnology is the near-atomic manipulation of matter to create new structures, materials, and gadgets.

The technique offers scientific improvement in a variety of fields, including medical, consumer goods, energy, materials, and manufacturing.

Dendrites are a kind of nanoparticle that has been studied extensively for a variety of medicinal applications, including medication administration, imaging, and diagnostics in the brain.

Hence,dendrimers are the form of nanotechnology is most likely to help improve brain imaging.

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Answer:

B. Quantum Dots

Explanation:

Nanotechnology with quantum dots allows for better imaging while examining the body.

The most likely solution to the motor spinning a half rotation and stopping is checking the commutator, because the current is not reversing.

Electric motors are devices that convert electrical energy into mechanical energy used in driving other devices.

Electric motors require batteries to work or A.C. currents to work.

The most likely solution to the motor spinning a half rotation and stopping is checking the commutator, because the current is not reversing.

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Answer:

c

Explanation:

edge 2022

Answer:

1. Stars, Nebula, Exo Planets, Star Clusters
2. Galaxies, Magelnic Clouds, Voids

Explanation:

Studying Astronomy for Years hope this helps and if you need more than this basic run down let me know have a great night!

The force can be defined as rate of change in momentum because consists of the action of rotating or twisting a body around its axis of rotation (pole) through the application of a force.

The magnitude of the moment (M) is defined as the product of the magnitude of the force (F) and the distance (d) between the line of action of the force and the axis. The unit of moment of a force in the international system of units is N.m.

Torque, or moment of a force, is the tendency of a force to rotate a body on which it is applied. Torque is a vector perpendicular to the plane formed by the force and radius of rotation vectors.

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#1

These are two types of activities either muscular or cardiovascular.

#2

They are differing in the muscles they target ,Either cardio else others.

#3

Cardiovascular fitness is the fitness of our heart's muscular.Doing cardio workouts can be quite helpful in maintaining that fitness level

Muscular endurance denotes to strengthen of muscles like biceps ,knees ,ankles ,abs etc .

Answer:

missing mass has been converted to energy according to Einstein mass energy equation

Answer:

The two philosophers furthermore seem to share the same conception of the conditions of human freedom. For Hegel as well as Kant, a theory of morality and political right devoted to advancing the cause of freedom must require more than just the absence of obstacles preventing the satisfaction of our animal passions.

Explanation:

Hope that help ;)

Answer:

Both are caused by heating

Answer:

When the car crashes, there is no unbalanced force acting on the person, so they continue forward (Newton's First Law). The person moves against the seat belt, exerting a force on it.

Answer:

At the critical angle the angle of refraction (outside the medium) is 90°

Ni sin θ = Na sin 90° = 1    assuming outside medium is air

sin θ = 1 / Ni            where Ni is the refractive of the medium involved

The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing, called an image. Real and virtual images are the two sorts of images.

The following parameters can be used to describe an image:

1. It is possible for an image to be real or virtual.

2. Left-right reversal is possible or not.

3. The image can be inverted or upright.

4. The image can be enlarged, shrunk, or made the same size as the object.

Plane mirrors provide virtual images that are upright, inverted left-right, the same distance from the mirror as the item, and the same size as the thing.

As a result, the best description of image production by a plane mirror is “a virtual picture is produced behind the mirror.”

The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

Hence, option D is correct.

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Answer:

It is a circuit that is easily damaged

Water can rise from the roots to the tops of trees due to capillary action. The correct option is A.

It is the phenomenon by which the liquid rises or falls in a very small diameter tube.

In plants. its roots have very thin diameter tubes which are not visible to the eye. But the water reached to the plants through these tube to every single part of the plant i.e. from root to the fruits.

So, water can rise from the roots to the tops of trees due to capillary action.

Thus, the correct option is A.

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The Answer Is Displacement  

The ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.

Exhaust fan is defined as the device that is used to remove excess moisture, odors, and stale air usually from the kitchen.

When being installed in the kitchen, it should be above the kitchen stove and high enough to be able to remove the steam from the cooking activities.

Therefore, the ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.

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Answer:

d) observers in different reference frames will measure time and distance differently

The coefficient of kinetic friction between Thumper and the ice is determined as 0.1.

The coefficient of kinetic friction between Thumper and the ice is determined as follows;

μk = a/g

where;

a = v/t

a = 8/12

a = 0.667 m/s²

μk = a/g

μk = 0.667/9.8

μk = 0.1

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The potential energy of the rock is 19600 J. Then, the kinetic energy when it hits the ground will be 19600 J. The velocity before it hits the ground will be 44.2 m/s.

The potential energy of an object is the energy by virtue of its position. It is related to the mass, m ,height h and acceleration due to gravity g as follows:

p = mgh.

Given m =20 kg

height = 100 m

g = 9.8 m/s²

then  p = 20 kg × 100 m ×  9.8 m/s² = 19600 J.

When the rock falls down as it approaches the ground, the potential energy converts to kinetic energy. Hence, the kinetic energy before it strike the ground will be 19600 J.

Ke = 1/2 mv² = 19600 J

then v = √ (2 Ke/m)

v = √(2× 19600 J/20 kg) = 44.2 m/s.

Therefore, the speed of the rock as it hits the ground is 44.2 m/s.

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Answer:

[tex]64\; {\rm m}[/tex], assuming that the rollercoaster is not attached to the track.

Explanation:

Let [tex]r[/tex] denote the radius of the loop. The height of the top of the loop would be [tex]2\, r[/tex].

Let [tex]a[/tex] denote the acceleration of the rollercoaster. At any position in the loop, if the speed of the rollercoaster is [tex]v[/tex], the (centripetal) acceleration of the rollercoaster would be:

[tex]\displaystyle a = \frac{v^{2}}{r}[/tex].

Let [tex]m[/tex] denote the mass of the rollercoaster. The net force on the rollercoaster would then be:

[tex]\displaystyle F_\text{net} = m\, a = \frac{m\, v^{2}}{r}[/tex].

The rollercoaster would stay on the track (and goes around the loop without falling off) only if the normal force [tex]F_\text{normal}[/tex] between the track and the rollercoaster is non-negative. In other words: it is necessary that [tex]F_\text{normal} > 0[/tex] for the rollercoaster to stay on the track.

At the top of the loop, [tex]F_\text{normal}[/tex] and the weight of the rollercoaster [tex]m\, g[/tex] are in the same direction as the centripetal acceleration (downwards towards the center of the loop.) Hence:

[tex]F_\text{net} = F_\text{normal} + m\, g[/tex].

Let [tex]v_\text{top}[/tex] denote the speed of the rollercoaster at the top of the loop.

[tex]\begin{aligned} F_\text{normal} &= F_\text{net} - m\, g \\ &= \frac{m\, v_\text{top}^{2}}{r} - m\, g\end{aligned}[/tex].

If [tex]F_\text{normal} > 0[/tex] at the top of the loop, then:

[tex]\displaystyle \frac{m\, v_\text{top}^{2}}{r} - m\, g > 0[/tex].

[tex]\displaystyle v_{\text{top}}^{2} > g\, r[/tex].

At the same time, by the conservation of energy, the sum of the kinetic energy [tex]\text{KE}[/tex] and gravitational potential energy [tex]\text{GPE}[/tex] of the rollercoaster should stay the same during the entire ride. Assuming that [tex]\text{GPE}\![/tex] is [tex]0[/tex] at the bottom of the loop:

[tex]\begin{aligned}& \text{KE at the bottom}\\ &= \text{KE at the top} + \text{GPE at the top}\end{aligned}[/tex].

Let [tex]v_{0}[/tex] denote the speed of the rollercoaster at the bottom of the loop.

[tex]\begin{aligned}\text{KE at the bottom} = \frac{1}{2}\, m\, {v_{0}}^{2}\end{aligned}[/tex].

The speed of the rollercoaster at the top of the loop [tex]v_\text{top}[/tex] is at least [tex](g/r)[/tex]. Therefore:

[tex]\begin{aligned}& \text{KE at the top}= \frac{1}{2}\, m\, {v_{\text{top}}}^{2} > \frac{1}{2} \, m\, g\, r\end{aligned}[/tex].

Since the height of the loop is [tex]2\, r[/tex], the [tex]\text{GPE}[/tex] of the rollercoaster at the top of the loop would be:

[tex]\text{GPE at the top} = m\, g\, h = 2\, m\, g\, r[/tex].

Thus:

[tex]\begin{aligned} \frac{1}{2}\, m\, {v_{0}}^{2} &= \text{KE at the bottom}\\ &= \text{KE at the top} + \text{GPE at the top} \\ & > \frac{1}{2}\, m\, g\, r + \text{GPE at the top}\\ & = \frac{1}{2}\, m\, g\, r+ 2\, m\, g\, r \\ &= \frac{5}{2}\, m\, g\, r\end{aligned}[/tex].

In other words:

[tex]\displaystyle \frac{1}{2}\, m\, {v_{0}}^{2} > \frac{5}{2}\, m\, g\, r[/tex].

Rearrange and simplify to obtain a bound on [tex]r[/tex]:

[tex]\begin{aligned} r < \frac{(1/2)\, m\, {v_{0}}^{2}}{(5/2)\, m\, g}\end{aligned}[/tex].

[tex]\begin{aligned} r < \frac{{v_{0}}^{2}}{5\, g}\end{aligned}[/tex].

Given that [tex]v_{0} = 40\; {\rm m\cdot s^{-1}[/tex] and [tex]g = 10\; {\rm N \cdot kg^{-1}} = 10\; {\rm m\cdot s^{-2}[/tex]:

[tex]\begin{aligned} r & < \frac{{v_{0}}^{2}}{5\, g} \\ &= \frac{(40\; {\rm m\cdot s^{-1}})^{2}}{5 \times (10\; {\rm m\cdot s^{-2}})} \\ &= 32\; {\rm m}\end{aligned}[/tex].

Hence, the radius of this loop is at most [tex]32\; {\rm m}[/tex], such that the height of the top of this loop is at most [tex]2 \times 32\; {\rm m} = 64\; {\rm m}[/tex].

Answer:

False

Explanation:

This is due to the gravitational pull, since the moon does not have the same force or gravity like Earth, your weight would change.

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