I need help with this science work

Answer:

Explanation:

The modern United Kingdom and France, by virtue of most government power being held by the central, national government,

Answer:

The answer Iswhat the other person said

Explanation:

By dividing an uphill or downward movement into smaller increments, an inclined plane facilitates work.

An inclined plane wrapped around a cylinder is how a screw looks. It increases the forward driving power from a tiny rotational force.

A basic device with a sloping surface called an inclined plane is used to lift heavy objects. When friction is taken into account, the force needed to move an object up an incline is less than the weight being raised. The needed force is closer to the real weight the higher the slope or incline.

A screw is a device that transforms rotational motion into linear motion and a torque's (a rotational force's) linear force into rotational motion. One of the six traditional simple machines, it. The most typical design consists of a cylindrical shaft with external threads, which are helical ridges or grooves.

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Answer:

12.5 km/h

Explanation:

For this question, you just need to use the equation x/t = v. X is distance, T is time, and V is velocity. If you need to as well, you could convert km to m and h to s to make it into m/s.

Answer:

2 km due south.

Explanation:

We need to find the displacement of 4km south,2 km north, 5km south, and 5 km north.

Let south is negative direction and north is positive direction.

The shortest path covered by an object is called its displacement.

D = -4+2-5+5

D = -2 km

So, the displacement is 2 km and it is in south direction.

Answer:

ok

Explanation:

Answer:

♡ goodmorning ♡

the answer is a.

hope this could help! ☆

- madeline/madi

✧･ﾟ: *✧･ﾟ:･ﾟ✧*:･ﾟ✧･ﾟ

Explanation:

Answer: Left cheek from the sun

Explanation:

Answer:

false

Explanation:

(im sorry if im not right but im pretty sure that false is the answer)

Answer:

The end that faces the north is called the north-seeking pole, or north pole, of the magnet. The other end is called the south pole. When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges.

Explanation:

Answer:

North pole, south pole

Explanation:

The end of the pole that faces the north is the north pole, and the other end is called the south pole.

Opposite poles attract (North-South), but like poles repel (South-South, North-South).

Answer:

The resistance of the inductor at resonance is 258.76 ohms.

Explanation:

Given;

resistance of the resistor, R = 305 ohm

capacitance of the capacitor, C = 1.1 μF = 1.1 x 10⁻⁶ F

inductance of the inductor, L = 42 mH = 42 x 10⁻³ H = 0.042 H

At resonance the inductive reactance is equal to capacitive reactance.

[tex]\omega L = \frac{1}{\omega C}\\\\2\pi F_0 L = \frac{1}{2\pi F_0 C}\\\\F_0 = \frac{1}{2\pi\sqrt{LC} }[/tex]

Where;

F₀ is the resonance frequency

[tex]F_0 = \frac{1}{2\pi\sqrt{LC} } \\\\F_0 = \frac{1}{2\pi\sqrt{(0.024)(1.1*10^{-6})} }\\\\F_0 =980.4 \ Hz[/tex]

The inductive reactance is given by;

[tex]X_l = 2\pi F_0 L\\\\X_l = 2\pi (980.4)(0.042) \\\\X_l = 258.76 \ ohms[/tex]

Therefore, the resistance of the inductor at resonance is 258.76 ohms.

Answer:

t think 90

Explanation:

m=f/a

=45kg m/s/0.5m/s

450kg/5

90kg

Answer:

0.01 s

Explanation:

The following data were obtained from the question:

Mass (m) of baseball = 0.15 kg

Initial velocity (u) = +26 m/s

Final velocity (v) = 0 m/s

Force (F) applied = –390 N

Time (t) =?

Next, we shall determine the acceleration of the baseball. This can be obtained as follow:

Mass (m) of baseball = 0.15 kg

Force (F) applied = –390 N

Acceleration (a) of baseball =?

F = ma

–390 = 0.15 × a

Divide both side by 0.15

a = –390/0.15

a = –2600 m/s²

Finally, we shall determine the time taken for the baseball to stop. This can be obtained as follow:

Initial velocity (u) = +26 m/s

Final velocity (v) = 0 m/s

Acceleration (a) = –2600 m/s²

Time (t) =?

v = u + at

0 = 26 + (–2600 × t)

0 = 26 – 2600t

Collect like terms

0 – 26 = – 2600t

– 26 = – 2600t

Divide both side by – 2600

t = –26 / –2600

t = 0.01 s

Thus, it will take 0.01 s for the baseball to stop.

Answer:

0.01 s

Explanation:

The answer above is correct.

Answer:

Average force exerted on car = 250,000 N or 250 KN

Explanation:

Given:

Initial speed u = 20 m/s

Final speed v = 0 m/s

Total distance covered = 1.2 m

Find:

Average force exerted on car

Computation:

v² = u² + 2as

0² = 20² + 2(a)(1.2)

a = -166.67 m/s² or 166.67 m/s²

Average force exerted on car = Ma

Average force exerted on car = (1,500)(166.67)

Average force exerted on car = 250,000 N or 250 KN

Answer:

D. 1020 J

Explanation:

In a closed system the law of conservation of energy is prevalent.

According to the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".

Answer:

A. 1.

B. 5.

C. 3.

D. 4.

E. 6.

F. 4.

Explanation:

This question is incomplete, the complete question is;

A coil consists of 200 turns of wire. Each turn is a square of side 18 cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.50 T in 0.80 s,

a) what is the magnitude of the induced emf in the coil while the field is changing?

b) if the resistance of the coil is 2.0, what is the magnitude of the induced current in the coil while the field is changing?

Answer:

a) the magnitude of the induced emf in the coil is 4.05 V

b) induced current in the coil I is 2.025 A

Explanation:

Given that;

side of turn a = 18 cm = 0.18 m

no. of turns N = 200

dB = 0.50 T

time t = 0.80 sec

(a)

what is the magnitude of the induced emf in the coil while the field is changing?

we know that the magnetic flux is equal to the product of the magnetic field in a loop and the area of the loop so;

 ∅ = NBA

expression for the electromotive force is expressed as;

∈ = d∅/dt

Now replace NBA for ∅ in the above equation.

∈ = d(NBA) / dt

= NA(dB/dt)

The expression for the area of each square turn is expressed as follows

A = a²

a is the side of the turn

so we substitute the value of a

A = (0.18) ²

A= 0.0324 m²

 As  earlier derived

formula for the electromotive force is as follows:

∈  = NA(dB/dt)

so we substitute all our values

∈ =  (200)(0.0324m²) (0.50T/0.80s)

∈ = 6.48 × 0.625

∈ = 4.05 V

Therefore the magnitude of the induced emf in the coil is 4.05 V

(b)

if the resistance of the coil is 2.0, what is the magnitude of the induced current in the coil while the field is changing?

we know that the current induced in the circuit is equal to the ratio between the electromotive forces to the resistance of the ring so;

I = ∈ / R

given that; resistance of the coil = 2.0

so we substitute

I = 4.05 / 2.0

I = 2.025 A

Therefore induced current in the coil I is 2.025 A

Answer:

Explanation:

initial momentum = .36 kg.m.s⁻¹

negative impulse = force x time = .02 x 12 = .24 kg.m.s⁻¹

final momentum - initial momentum = impulse

final momentum = initial momentum + impulse

= .36 - .24

= .12 kg.m.s⁻¹

Answer:

The lens is a concave lens

Explanation:

In concave lens, the image formed is erect. diminished and virtual. The more the distance of the object from the mirror, the more diminished the image formed will be. Concave lens are used in binoculars and telescopes and are installed before or in the eye piece to enable a clear focus.

Answer:

yes

Explanation:

Answer:

- Final energy of neutron is 1.557 Mev

- Final energy of nucleus is 0.443 Mev

Explanation:

Given the that;

for ¹⁶O, A = 16

we know that Energy of neutron and nucleus after collision = ( A - 1 / A + 1)² E₀

so we substitute

Fe = ( 16 - 1 / 16 + 1)² × 2

= (0.8823)² × 2

= 1.557 Mev

therefore Final energy of neutron is 1.557 Mev

Final energy of nucleus will be

2 - Final energy of neutron

= 2 - 1.5569

= 0.443 Mev

therefore Final energy of nucleus is 0.443 Mev

Answer:

Since the object is floating, the buoyant force equals the weight of the water displaced:

W = d g v  where d is the density of water and v = V/2 where v is the volume of the water displaced   and v = V/2 where V is the volume of the object.

W = 1000 kg/m^3 * 9.8 m/s^2 * (3.5 /2 m^3)

W = 17150 kg m / s^2 = 17150 N

When an object floats with half its volume beneath the surface of the water. If the volume of the object is 3.5 m,then the weight of the object would be 17167.5 N if the density of water is 1000 kg/m3

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

The density is the reciprocal of the specific volume of any substance.

The mathematical formula for density is given below

ρ =m /V

where ρ is the density of the substance

m is the mass of the substance

V is the volume of the substance

As given in the problem an object floats with half its volume beneath the surface of the water. The volume of the object is 3.5 m

The density of water is 1000 kg/m3​

According to the Archimedes principle, the buoyancy force acting on  the floating object is equal to the weight of the fluid displaced by it

W =  ρ g V

Given the object floats with half its volume beneath the surface of the water means the volume of the water displaced is half of the volume of the object

V=3.5/2 m³

W = 1000×9.81×3.5/2

   = 17167.5 N

Thus, the weight of the object is 17167.5 N

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Answer:

-36 m/s

Explanation:

u = 18m/s

a = -9m/s²

v = ?

t = 6s

from,

v = u + at

v = 18 + (-9)(6)

v = 18 - 54

v = -36m/s

Answer:

Wm = 97.2 [N]

Explanation:

We must make it clear that mass and weight are two different terms, the mass is always preserved that is to say this will never vary regardless of the location of the object. While weight is defined as the product of mass by gravitational acceleration.

W = m*g

where:

m = mass = 60 [kg]

g = gravity acceleration = 10 [m/s²]

But in order to calculate the weight of the body on the moon, we must know the gravitational acceleration of the moon. Performing a search of this value on the internet, we find that the moon's gravity is.

gm = 1.62 [m/s²]

Wm = 60*1.62

Wm = 97.2 [N]

Answer:

5m/s²

Explanation:

The force exerted on an object is calculated using the formula ;

F = ma

Note that the upward force (F) is 148N

Where;

F = force (N)

m = mass (kg)

a = acceleration (m/s²)

The downward force towards gravity is F' = mg

F' = 10 × 9.8m/s²

F' = 98N

Net force (F - F') = m × a

148 - 98 = 10 × a

50 = 10a

a = 50/10

a = 5m/s²

Answer:

0.126J

Explanation:

To calculate the potential energy of the system U:

Since the charges are the same, and the charges between them are the same.

q1 =q2 = q3 are the charges, and r1=r2=r3 is the distance between their centres.

q = 1.45 μC

r = 0.450 m

1/4πE°(3q^2/r)......... 1

1/4πE° = 9 × 10^9 N⋅m^2⋅C−2,

Substitute the values into equation 1

= 9 × 10^9 N⋅m^2⋅C−2 × {3* (1.45×10^-6)^2/0.450m}

= 9 × 10^9 N⋅m^2⋅C−2×{3*2.1025^-12/0.450m}

= 9 × 10^9 N⋅m^2⋅C^−2×{6.3075^-12}/0.450m

= 9 × 10^9 N⋅m^2⋅C^−2 × 1.401^-11

= 0.12615J

= 0.126J

Answer:

i think issa uh.. i think issa carrot

Explanation:

Answer: synthesis

Explanation:

Chemical reaction which Brianna is explaining is synthesis  reaction as she is making use of various colors to make a sculpture of horse .

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

Electromagnetic waves

Electromagnetic waves bring energy into a system by virtue of their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave itself, whether it is absorbed or not.

So the answer is B electrical energy

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