As the mass of object increased it is density increased

Answer:

Ra / Rb = 3

Explanation:

The resistance is defined by the expression

         r = ρ L / A

where A is the area of ​​the wire and L is the length

let's find the area of ​​each wire

a) solid wire (A) of d₁ = 1 m

           r = d₁ / 2 = 0.5 m

          A = π r²

          A = π 0.5²

          R_a = [tex]\frac{\rho \ L}{\pi \ 0.5^2}[/tex]

          R_a = 4 \frac{\rho \ L}{\pi   }

b) hollow tube (B) of d₁ = 1 m and d₂ = 2m

the radios are

            r₁ = 0.5 m

            r₂ = 1 m

the area is

            A = π r₂² - π r₁²

            A = π (r₂² - r₁²)

            A = π (1² - 0.5²)

            A = π 0.75

resistance is

             R_b = [tex]\frac{ \rho \ L }{\pi \ 0.75}[/tex]

             R_b = 1.33 \frac{ \rho \ L }{\pi  }

therefore the relationship between these two resistances is

             Ra / Rb = 4 / 1.33

             Ra / Rb = 3

Answer:

the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface

Explanation:

Answer:

Gravitational force is the force of attraction in which body having certain mass in the universe attracts every other body which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

c.  6.6

The x-component of a vector can be either sinθ or cosθ, depending on which angle you are given.

Cosθ always goes with the side of a right triangle that is adjacent to (touches) the given angle.

The projection of a vector quantity on the x axis of a coordinate system.

If you shine a light straight down onto that vector, then the length of its shadow on the x-axis is

x-component = 8· cosine(34°)

x-component = 8 · (0.829)

x-component = 6.6

Therefore,

6.6  is the length of the x-component of the vector.

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Answer:

a)[tex]|N|=9.83\: N[/tex]  at the top

[tex]|N|=33.37\: N[/tex] at the botton

b) The minimum velocity will be [tex]v=4.43\: m/s[/tex].

Step-by-step explanation:

a) Using the second Newton's law, at the top of the circle we have.

[tex]\Sigma F=ma_{c}[/tex]

The forces at the top are the weight and the normal force.

[tex]W-N=m\frac{v^{2}}{R}[/tex]

[tex]mg-N=m\frac{v^{2}}{R}[/tex]

[tex]N=mg-(m\frac{v^{2}}{R})[/tex]

[tex]N=1.2*9.81-(1.2\frac{6^{2}}{2})[/tex]        

[tex]N=-9.83\: N[/tex]  

[tex]|N|=9.83\: N[/tex]      

At the botton of the circle we have:

[tex]N-W=m\frac{v^{2}}{R}[/tex]

[tex]N-mg=m\frac{v^{2}}{R}[/tex]

[tex]N=1.2*9.81+(1.2\frac{6^{2}}{2})[/tex]  

[tex]|N|=33.37\: N[/tex]

b) If we do the normal force equal to zero we can find the minimum velocity, which means:

[tex]W-0=m\frac{v^{2}}{R}[/tex]

[tex]mg=m\frac{v^{2}}{R}[/tex]

[tex]v=\sqrt{Rg}[/tex]

[tex]v=\sqrt{2*9.81}[/tex]

Therefore, the minimum velocity will be [tex]v=4.43\: m/s[/tex].

I hope it helps you!

Answer:

A closed system.

Explanation:

The three major types of system are: open, closed and isolated. Open system interacts with its surroundings with respect to its particles and energy. A closed system interacts with its surroundings with respect to energy but not its particles. While an isolated system does not interact with its surroundings in any way.

Therefore, after the jar is sealed, it is an example of a closed system. This is because the emitted gas could not escape into the surroundings, but thermal energy was emitted into its surroundings after the chemical reaction has taken place.

Answer:

*Doppler effect by the displacement or towards the red

*The microwave temperature of the universe

Explanation:

The expansion of the universe can be visualized in various facts

* the stars and galaxies are moving away from us, this is observed in the Doppler effect by the displacement or towards the red of the hydrogen lines.

* The microwave temperature of the universe that comes from everywhere, this temperature is the rest of the temperature of an initial great explosion (big ban), for which the expanding universe must cool down.

Answer:

momentum=31.5

Explanation:

given,

mass(m)=2.1kg

velocity(v)=15m/s

momentum(p)=?

now,

p=mv

p=15×2.1

p=31.5 kgm/s

Answer:

B. The thrown ball

Explanation:

because you are giving the ball a higher force causing the acceleration to be higher

Answer:

A. 14.14 m/s²

B. 127.26 m/s

C. 572.67 m

Explanation:

From the question given above, the following data were obtained:

Mass (m) of jet = 4250 kg

Force (F) = 60100 N

A. Determination of the acceleration of the jet.

Mass (m) of jet = 4250 kg

Force (F) = 60100 N

Acceleration (a) =?

F = ma

60100 = 4250 × a

Divide both side by 4250

a = 60100 / 4250

a = 14.14 m/s²

B. Determination of the speed of the jet after 9 s.

Initial velocity (u) = 0 m/s

Acceleration (a) = 14.14 m/s²

Time (t) = 9 s

Final velocity (v) =?

v = u + at

v = 0 + (14.14 × 9)

v = 0 + 127.26

v = 127.26 m/s

C. Determination of the distance travelled during the time.

Initial velocity (u) = 0 m/s

Acceleration (a) = 14.14 m/s²

Time (t) = 9 s

Distance travelled (s) =?

s = ut + ½at²

s = (0 × 9) + (½ × 14.14 × 9²)

s = 0 + (7.07 × 81)

s = 0 + 572.67

s = 572.67 m.

Answer:

The answer is "[tex]12682.267\ \ \frac{W}{m^2}[/tex]"

Explanation:

Calculating the mass flow rate of fluid:

[tex]m= \rho AV[/tex]

   [tex]= \rho \frac{\pi}{4} D^2\ V\\\\= 100 \times \frac{\pi}{4} \times (0.0127)^2\times 0.2\\\\=0.0253 \ \frac{kg}{s}\\\\[/tex]

Calculating the amount of heat transfer.

[tex]q =m\timesC_p(T_{m,0}-T_{m,i})[/tex]

  [tex]=0.0253 \times 4000 (75-25)\\\\=0.0253 \times 4000(50)\\\\=0.0253 \times 200,000 \\\\= 5060 \ W[/tex]

Calculating the required value for heat flux:

[tex]q"=\frac{q}{A_s}[/tex]

   [tex]=\frac{q}{\pi DL}\\\\= \frac{5060}{\pi \times 0.0127 \times 10}\\\\= 12682.267 \frac{W}{m^2}\\[/tex]

e xddd  snoAnswer:n

E

xplanation:s no

Answer:

25.0

Explanation:

Answer:

  I₂ = 0.04 W / m²

Explanation:

Sound intensity is the power emitted between the unit area

          I = W / A

         W = I A

sound is a wave that travels in space whereby its energy is distributed on the surface of a sphere

         A = 4π r²

we substitute

         W = I (4π r²)

the emission power is constant, so the intensity at two different points is

           W = I₁ 4π r₁² = I₂ 4π r₂²

so the equation is

            I₁ r₁² = I₂ r₂²

In this case the units are not shown in the exercise, suppose that all units are in the SI system

           I₂ = [tex]I_1 \ \frac{r_1^2}{r_2^2}[/tex]

let's calculate

           I₂ = 4 [tex]4 \ \frac{2^2}{20^2}[/tex]

           I₂ = 0.04 W / m²

Answer:

The more velocity an object has the harder it is to slow it down

Explanation:

slow it down

Answer:

48

Explanation:

The formula is d, time t, and speed or rate of travel r is:

d = rt.

We know that d = 120 km and t = 2 hours and 30 minutes = 2.5 hrs.

So you now plug in for d and t to find r, we get:

120 km = r(2.5 hrs)

divide both sides by 2.5 and we get

120 km/2.5 hrs = [r(2.5 hrs)]/2.5 hrs

120 km/2.5 hrs = r(2.5 hrs/2.5 hrs)

48 km/hr = r(1)

r = 48 km/hr

Speed = (distance covered) / (time to cover the distance)

Speed = (120 km) / (2.5 hr)

Speed = (120/2.5) (km/hr)

Speed = 48 km/hr (B)

so 30.8/13= is 2.369

so round your ans to I dp which is

2.4d/kg

Answer:

150m/s

Explanation:

0.150km to m is multiplying by 1000.

Answer:

I don't know this for sure, but I think its because they need to be able to sit in their seats without flying in the air.

Explanation:

Because of the centrifugal force he ship must rotate so that passengers feel effects similar to gravity.

''Centrifugal force is force acting on a body performing circular motion, which is along radius of the circle and directed outwards from the center of circle".  Since Centrifugal force acts at right angle to the tangential velocity of the body, there is no displacement in the direction of the force, hence no work done. It has newton(N) as Si unit.

centripetal force is given by,

F= mv²÷r

Where m is mass of the body v is velocity of the body r is radius of circle at which body is moving.

When space ship rotate to the certain angular velocity, centrifugal force will act on each object in the space ship. that force will force the object radially outwards as result all will stuck on the floor and all will experience the feel of gravity.

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Answer:

B. 4700 J

Explanation:

Given the following data;

Mechanical energy = 4900J

Mass = 100kg

Velocity = 2m/s

To find the potential energy;

Mechanical energy = kinetic energy + potential energy

First of all, we would determine the kinetic energy of the object;

K.E = ½mv²

K.E = ½*100*2²

K.E = 50*4

K.E = 200 J

Substituting into the equation, we have;

4900 = 200 + P.E

P.E = 4900 - 200

P.E = 4700 Joules

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Answer:

hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity.

Explanation:

doesn't really need one.

Answer:

Kinetic Energy = 36 Joules

Explanation:

Given =

Mass = 2kg

Velocity = 6m/s

Solution =

Kinetic Energy = 1/2 × mv²

Kinetic Energy = 1/2 × 2 × 6 × 6

Kinetic Energy = 36 Joules

The kinetic energy of the string is 36 Joules.

To find the kinetic energy, the values given are

Mass m = 2 kg

speed v = 6m/s

  If an object is in motion, the energy of the object is said to be kinetic energy. The object kinetic energy will be changed unless it has the changes in the mass and speed.

The unit of Kinetic energy is Joules.

Formula for kinetic energy is,

                 K. E = 1/2 mv²

where, K. E - Kinetic energy

          m - mass

          v - velocity

Substituting all the values given,

          K. E = 1/2 ( 2 × 6² )

                 = 1/2 × 2 × 6 × 6

                = 36 J.

So, the kinetic energy of the string is 36 J.

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Answer:

This may help

Examples of Newton's third law of motion are ubiquitous in everyday life. For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.

Explanation:

Answer:

There is no kinetic energy.

Explanation:

Since K=1/2mv^2 where m=2122kg and v=0, clearly the car has no kinetic energy as multiplying by 0 results in 0. If the car were moving, there would be kinetic energy.

Answer:

a

Explanation:

Answer:

Half: 6 cm^2    Whole: 12 cm^2

Explanation:

First, we know that the edges of the cube are 2 cm long. So there are 6 faces on a cube. We do 2x6=12 cm^2 as our total surface area. Then it asks for each half. So you would divide it by 2 and get 6 cm^2 as your half.

Answer:

Erosion is the wearing away if land by forces such as water and wind. It has created things such as mountain peaks, valleys and coastlines.

Answer:

b down

Explanation:

because as she is jumping she is bending her nees so the acceleration is down words

Answer:

b down

Explanation:

Answer:

C. Size and Direction

Answer:

40 cm

Explanation:

We are given that

Magnification of concave mirror, m=4

Object distance, u=-10cm

We have to find the position of image.

We know that

Magnification of concave mirror, m=[tex]-\frac{v}{u}[/tex]

Using the formula

[tex]4=-\frac{v}{-10}[/tex]

[tex]4=\frac{v}{10}[/tex]

[tex]v=4\times 10[/tex]

[tex]v=40cm[/tex]

Hence, the image is formed at distance 40 cm behind the mirror.