Does anybody know this ???

Answer:

c

Explanation:

Answer:

too little body fat is a health risk

Explanation:

IF you do not have enough body fat you can have bad things happen to you

true

Explanation:

this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons

Answer and Explanation:Option A->The innermost layer of the earth is known as the core. It is divided into inner core and outer core. It comprises of a high concentration of nickel and iron.

Answer:

The tire fills up just like anything else that holds air when u pump a ball or tire up it fills all the way up cause it is a small confined space and after filling it with air the atoms of the air fill the tire up

Explanation:

Answer:

Work done W = 50 N-m

Explanation:

Given:

Force F = 10 N

Distance s = 5 meter

Find:

Work done

Computation:

Work done is formulated way that it includes both Applied force upon thing and  displacement of thing.

W = fs

W = 10 x 5

Work done W = 50 N-m

Answer:

0.8 N

Explanation:

From coulomb's law,

Formula:

F = kqq'/r²........................ Equation 1

Where F = Force of repulsion, k = coulomb's constant, q = first positive charge, q' = second positive charge, r = distance between the charge.

Given: q = 20 μC = 20×10⁻⁶ C, q' = 100 μC = 100×10⁻⁶ C, r = 150 cm = 1.5 m.

Constant:  k = 9×10⁹ Nm²/C²

Substitute these values into equation 1

F = (20×10⁻⁶ )( 100×10⁻⁶)(9×10⁹)/1.5²

F = 1800×10⁻³/2.25

F = 1.8/2.25

F = 0.8 N

Answer:

to heat spaces in buildingss

Explanation:

Answer:

Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. ... To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd.

Explanation:

Definition of work in physics

Answer:

Acceleration, a = 2.47 seconds

Explanation:

Given the following data;

Time, t = 1.8 seconds

Distance = 4 meters

Initial velocity = 0 m/s (since it's starting from rest)

To find the acceleration of the toy car, we would use the second equation of motion;

[tex] S = ut + \frac {1}{2}at^{2}[/tex]

Where;

S represents the displacement or height measured in meters.

u represents the initial velocity measured in meters per seconds.

t represents the time measured in seconds.

a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

Substituting into the formula, we have;

[tex] 4 = 0(1.8) + \frac {1}{2}*a*(1.8)^{2}[/tex]

[tex] 4 = 0 + \frac {1}{2}*a*3.24[/tex]

[tex] 4 = \frac {1}{2}*a*3.24[/tex]

Cross multiplying, we have;

[tex] 8 = 3.24a[/tex]

[tex] a = \frac {8}{3.24}[/tex]

Acceleration, a = 2.47 seconds

Answer:

option A

Explanation:

the diameter is twice the length of the radius

hope it helps

The mechanical equilibrium condition allows to find the value of the normal for the body is:

Newton's second law establishes a relationship between the force, the mass and the acceleration of bodies, in the special case that the acceleration is zero, it is called a mechanical equilibrium condition.

       ∑ F = 0

A free body diagram is a diagram of the forces without the details of the bodies, in the attachment we can see this diagram, let's write the equilibrium condition for each axis.

x- axis

          Fₓ -fr = 0

y-axis

          F_y + N – W =0

Let's use trigonometry to find the components of the applied force.

            Cos 30= [tex]\frac{F_x}{F} [/tex]

            sin 30 = [tex]\frac{F_y}{F } [/tex]

            Fₓ = F cos 30

            [tex]F_y[/tex] = F sin 30

The weight of a body is the mass times the acceleration due to gravity.

           W = m g

Let's substitute.

           F sin 30 + N – m g = 0

           N= m g – F sin 30

Let's calculate.

           N = m 9.8 – 150 sin  30

           N = m 9.8 - 75

To finish the calculation, the mass of the body must be known, suppose a value of 10 kg.

          N=10 9.8 -75

          N = 23N

In conclusion using the mechanical equilibrium condition we can find the value of the normal for the body is:

Learn more about the mechanical equilibrium condition here: brainly.com/question/12804448

Answer:

0.36 J

Explanation:

[tex]PE = \frac{1}{2} kx^{2} \\PE = \frac{1}{2} (200 N/m)(0.06 m)^{2} \\PE = 0.36 J[/tex]

Answer:

As atoms in the spoon vibrates about their equilibrium positions and transfer energy form one end to other end. This process is called conduction.

Answer:Cricket !

The origins of cricket are very vague, and many theories have been put forward suggesting its origins, but it is, without doubt, very English. The first evidence of cricket being played was recorded in the year 1550, by the pupils of Royal Grammar School, Guildford.

Answer:

Oceanic currents an waves are in motion due to energy of wind.

Explanation:

Answer:

v = (10 i ^ + 0j ^) m / s,    a = (0i ^ - 9.8 j ^) m / s²

Explanation:

This is a missile throwing exercise.

On the x axis there is no acceleration so the velocity on the x axis is constant

           v₀ₓ =  10 m / s

On the y-axis velocity is affected by the acceleration of gravity, let's use the equation

           v_y = [tex]v_{oy}[/tex] - g t

           [tex]v_{y}^2 = v_{oy}^2 - 2 g (y - y_o)[/tex]

at the highest point of the trajectory the vertical speed must be zero

           v_y = 0

therefore the velocity of the body is

          v = (10 i ^ + 0j ^) m / s

the acceleration is

          a = (0 i ^ - g j⁾

          a = (0i ^ - 9.8 j ^) m / s²

Answer:

Neil Armstrong

Explanation:

Answer:

Neil Armstrong.

Explanation:

. PLEASE GIVE BRAINLIEST.

Answer:

balenced

Explanation:

Answer:

2400 km

Explanation:

30km for 1hr

Need up to 80 hrs , multiply both 80 and 30

So its 2400km

Answer:

7.7 m/s

Explanation:

Initial speed=2 m/s

mv=Ft

1*v=3*1.9

v=5.7 m/s

5.7+2=7.7

Answer:

A) so the conditions for the expirament don’t affect the outcome

b) to make sure the results are conclusive and accurate

Explanation:

Answer: When the isopropyl alcohol was boiled, it quickly boiled away. The water ALSO boiled away, but the alcohol was quicker. Isopropyl alcohol had a high vapor pressure because it boiled away very fast, and isopropyl alcohol had strong forces between its molecules (seen with the surface tension experiment.) The water boiled away slower, and had weaker forces between its molecules. So, the stronger the forces, the higher the vapor pressure

Explanation:

The period of the sound wave having frequency of 457Hz is 0.0022 s.

The frequency refers to the number of waves that pass a fixed point in unit time.

Time period is equal to the reciprocal of frequency.

                           i.e. T = 1 / f

So, The period of the sound wave having frequency of 457Hz will be

                                T = 1/457

                            ∴ T = 0.002188 s

Now , rounding to the nearest value we get , 0.0022 s

Thus , The period of the sound wave having frequency of 457Hz is 0.0022 s.

Learn more about frequency here -

https://brainly.com/question/254161

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Answer:

One of the primary advantages of thermal power is that the generation costs are extremely low. No fuel is needed to generate the power, and the minimal energy needed to pump water to the Earth's surface can be taken from the total energy yield.

Explanation:

Explanation:

heating system warming homes and other buildings is an abvous way that thermal energy can be used two common types of home heating system are hot water and warm air