physics 13

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Answer:

Explanation: O B. Diffraction

Answer:

See below

Explanation:

 to the force of kinetic friction

The number of protons, electrons, and neutrons in the atom of cr-24 is 28, 24, and 24 respectively.

An atom is the smallest unit of matter, consisting of the positively charged nucleus and the electrons which move around it. The atom can not be divided further.

The atom of a matter is made by three elements-

The atom of cr-24 has the atomic number 24. The atomic number of atom is equal to the number of proton and electron in an atom. Thus,

[tex]\rm Proton=24\\\rm Electron=24[/tex]

Now, if this atom has the mass number of 52 (most common). Then the number of neutron is,

[tex]\rm Neutrons=Mass\; Number-Atomic\; Number\\\rm Neutrons=52-24\\\rm Neutrons=28[/tex]

Thus, the number of protons, electrons, and neutrons in the atom of cr-24 is 28, 24, and 24 respectively.

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Answer:

Answer:2nd question answer is 2.75Explanation:

Mass of ball is missing in your 1st question.

for 2nd question,

Small cart,

m1 = 1.25kg

u1 = 2.5m/sec

v1 = -0.94m/sec ( negative sign indicate opposite motion)

Large cart,

m2 = ?

u2 = 0 m/s

v2 = 1.56 m/sec

from conservation of linear momentum,

m1*u1 + m2* u2 = m1*v1 + m2*v2

1.25*2.5 + m2*0 = 1.25*-0.94 + m2*1.56

3.125 + 0 = -1.175 + 1.56*m2

3.125 + 1.175 = 1.56*m2

4.3 = 1.56*m2

m2 = 4.3/1.56

m2 = 2.75 kg

if they stuck together instead of bounced. then,

total mass of bodies (m)= m1+m2= 4kg

final velocity of bodies (v) = ?

From , conservation of linear momentum,

m1*u1 + m2* u2 = m*v

1.25*2.5 + 2.75*0 = 4*v

3.125 = 4*v

v = 3.125/4

v = 0.78125 m/ sec.

The large cart has a mass of 2.75kg. This can be identified from the law of conservation of momentum. Its unit is kg.s⁻¹/m.

Momentum is the quantity that describes the motion of the body. The momentum equals the product of mass and velocity. Momentum= Mass/velocity. It depends on the velocity as velocity changes momentum also changes.

The law of conservation of momentum states that the initial and final momentums are the same in the system. It shows that the momentum of the system remains constant, before and after the collision.

In an isolated system of two bodies acting on each other, total momentum remains constant in the absence of external forces. It can neither be created nor destroyed.

Law of conservation of momentum:

Total momentum before collision = Total momentum after the collision

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

From the givens,

Mass of small chair, m₁ = 1.25kg,

The initial speed of the small chair before the collision, u₁ = 2.5 m/s,

The final speed of the small chair after the collision, v₁  = - 0.94 m/s (negative sign opposite sign),

The initial speed of the large chair before the collision, u₂ = 0 (large chair is at rest before the collision),

The final speed of the large chair after the collision, v₂ =  1.56 m/s,

The mass of a large chair m₂ =?

From the conservation of momentum:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(1.25×2.5) + (m₂×0) = (1.25(-0.94) + (m₂×1.56)

3.125 + 0 = - 1.175 +( m₂×1.56)

3.125+1.175 = ( m₂×1.56)

4.3 / 1.56 = m₂

m₂ = 2.75kg

Hence, the mass of a large chair, m₂ = 2.75kg.

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Because the measurement of motion is dependent on the observer's position or reference frame.

Answer:

a

Explanation:

maybe b but I think it's a

Answer: i think Hubble's Law basically states that the greater the distance of a galaxy from ours, the faster it recedes

Explanation:

Answer:

Push-ups. Let M1 be the mass of the body and M2 be the mass of weights. Assume that M1 must be heavier than M2. Since M1 is heavier, M1 requires more force, and therefore work to be applied, let F1=M1*g. To bring our body back up, we need a force bigger or equal (if already in motion) to F1.

Let F2 = M2*g

Since F1 has to be bigger than F2 due to mass, we can build an equation for energy. Let X be a displacement, which is equal in both situations. Constructing a change of energy equation we can see that work done to lift the body is greater:

W1=F1*x

W2=F2*x

Where W1 is the work of the hands-on body, and W2 is the work of lifting weights. W1 has to be larger than W2. Since more work in W1, more muscle will be needed to complete a repetition, but only assuming that M1 > M2.

Answer:

The mass of the products and reactants are the same on both sides of the equation.

The number of atoms of products and reactants are equal and hence it proves the law of conservation of mass.

.

Detailed Explanation:

The speed of an airplane that normally flies at 200 km/h when it encounters an 80 km/h wind from the side will be 215.4065 m/sec.

Speed is defined as the rate of change of the distance or the height attained. It is a time-based quantity. It is denoted by u for the initial speed while v for the final speed. Its SI unit is m/sec.

The resultant or the net value of the velocity is found as;

[tex]\rm V_{net}=\sqrt{ V_A^2+V_B^2} \\\\ \rm V_{net}=\sqrt{(200)^2+(80)^2} \\\\ V_{net}=\sqrt{46400} \\\\ V=215.4065\ km/h[/tex]

Hence,  the speed of an airplane will be 215.4065 m/sec.

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The statement 'research indicates that genetics does not influence levels of aggression' is False.

Behavioral genetics is a branch of the genetics field aimed at understanding behavioral human patterns.

In conclusion, the statement 'research indicates that genetics does not influence levels of aggression' is False.

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Answer:

B

Explanation:

This is the discovery of redshift that led scientist to say the universeis still expanding

Answer:

Yes

Explanation:

Whatever the system be the system ought to obey law of conservation of matter.

This law states that

Matter can neither be created nor be destroyed

Answer:

N~ f fric m 1~g The acceleration of the car can be calculated using v2 f v 2 i = 2a x a = v2 2 x = (72000 3600) 2 2 30 = 6:67m=s2 On the other hand, Projecting 2nd Law on the y-axis gives N=mg; For the book to slide o the seat, acceleration should overcome frction: f s < ma sN < ma smg < ma s = 0:650 < a g = 6:67 9:81 = 0:68

Explanation:

The doubling of the capacitance and the reduction of the voltage to half, the energy of the capacitor is reduced to half.

The capacitance is given as the storage of charge per unit voltage. It can be given as:

[tex]\rm C=\dfrac{Q}{V}[/tex]

The energy stored in the capacitor is given as :

[tex]\rm E=0.5\;CV^2[/tex]

The doubling of capacitance to 2C and reducing the voltage to 0.5V, the new energy is given as:

[tex]\rm E^n=0.5\;\times\;2C\;\times\;(0.5V)^2\\E^n=0.25\;CV^2\\E^n=0.5E[/tex]

Thus, with the doubling of the capacitance and the reduction of the voltage to half, the energy of the capacitor is reduced to half.

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The moment of inertia of the tetrahedron will be 435.75,Moment of inertia is found by the application of integration.

The sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation expresses a body's tendency to resist angular acceleration.

The moment of inertia  of a tetrahedron of constant density is found as;

[tex]\rm I_Z = \int\limits^a_b {dz} \, dv \\\\ dv=dxdy\\\\ I_Z = \int_0^9 \int_0^{8-\frac{8x}{9}} \int_0^{5-\frac{5x}{9} -\frac{5x}{8} }(x^2+y^2)dzdy[/tex]

After applying the limit, we get the answer is;

[tex]\rm I_Z= \frac{1743}{4} \\\\ I_Z= 435.75[/tex]

Hence, the moment of inertia of tetrahedron will be 435.75

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Answer:

Circle

Explanation:

Actually its Eclipse or ecliptial path.

Force varies inversely with square of distance.

Remember Gravitation?

Yes

F is inversely proportional to r²

So it's eclipse

Recheck if a option given or circle is most likely correct

[tex](R_1 +R_2)||R_3\\\\R_{eq} = \left(\dfrac 1{R_1 + R_2} + \dfrac 1{R_3}} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{100+200} + \dfrac 1{600} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{300} + \dfrac{1}{600} \right)^{-1}\\\\\\~~~~~~=\left(\dfrac{3}{600} \right)^{-1}\\\\\\~~~~~~=\dfrac{600}3 \\\\\\~~~~~~= 200~ \Omega[/tex]

A passenger experiences centripetal acceleration when there is circular motion around a center. The centripetal acceleration is 3 m/s².

The centripetal acceleration is the acceleration acting when a body is moving on a circular path. It is acted towards the center of the path. Centripetal acceleration is the product of the square of angular speed and radius of path.

a =ω²r

Given the radius of path r is 12 m and angular speed ω is 0.50 rad/s².

The resulting centripetal acceleration is

a = (0.50)²×12

a = 3 m/s²

Thus, the centripetal acceleration is 3 m/s².

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Answer:

c . they have high boiling points

Answer:

Explanation:

Discussion

The top picture should be obvious. The rope is tied at one end. The person holding it provides energy in the form of vibrations moving up and down the way the diagram is shown. The wave can also be created by the rope moving sideways.

The bottom picture is much harder. T energy is provided by the forefinger. It has to move. If you just stick your finger in the water, all that will happen is that you will move some water (very little in the scheme of things.

So the energy is provided by a moving forefinger.

Answer:

432 60 27 4.14 10 9 1=15000

Answer:

0.015A

Explanation:

I=V/R

=1.5/100

0.015A

Just apply ohm's law

The change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and work done.

Work done is the energy needed or supplied to perform any task.

The first law of thermodynamics gives the relation between the heat and work done.

The heat added to a system is divide into two. One portion adds up heat to increase the internal energy and the left heat is used to do work.

ΔQ = ΔU + W

ΔU = ΔQ -W

Thus, the first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and work done.

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Hello always here to help!!!!

__________________________

Existing rocks come together under great heat and pressure to generate metamorphic rocks. Marble, schist, slate, and quartzite are examples of metamorphic rocks. Heat and pressure cause chemical changes in minerals, resulting in metamorphic rocks. They are frequently encountered near magma, but unlike igneous rock, they do not melt.

__________________________

Have a great day!!!

Environmental science enlightens us on how to conserve our environment in the face of increasing human population growth and anthropogenic activities that degrade natural resources and ecosystems.

Explanation:

The scope of environmental studies is very wide and it deals with many areas like:

(i) Conservation of natural resources,

(ii) ecological aspects,

(iii) pollution of the surrounding natural resources,

(iv) controlling the pollution,

(v) social issues connected to it, and

(vi) impacts of human population on the environment.

The electric field strength will be 0.6252 V/m. It is the strength at which the field is created by charges.

The electric field strength is defined as the ratio of electric force and charge.

The electric field strength is found as;

[tex]\rm E = \frac{I \rho }{A} \\\\ \rm E = \frac{20 \times 1.68 \times 10^{-8} }{ (0.6385 \times 10^{-6}} \\\\ E= 0.5262 \ V/m[/tex]

Hence, the electric field strength will be 0.6252 V/m.

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Answer:

Environmental science is the dynamic, interdisciplinary study of the interaction of living and non-living parts of the environment, with special focus on the impact of humans on the environment.

Explanation:

The lifting force applied by the person in lowering the basket is determined as 7.8 N.

The lifting force applied by the person is determined from Newton's second law of motion.

F = mg - ma

F = m(g - a)

where;

F = 1(9.8 - 2)

F = 7.8 N

Thus, the lifting force applied by the person in lowering the basket is determined as 7.8 N.

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