PLEASE HELP!!!!!
When describing image formation for plane mirrors, what is an important rule
to remember about light rays?

Answer:

the pressure due to the water on the diver is 200,000 pascal

pressure = height × density × acceleration due to gravity

p = 20×1000×10

p=200,000 pascal

Jess wants to make her house more energy efficient. Insulating her loft, which will cost £460 and save £25 per year, is better long-term option. Therefore, option B is correct.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.

Computers, vehicles, communications, state-of-the-art medical technology, and many other things are all powered by energy. The demand for dependable and economical energy is especially pressing for emerging countries. It may enhance things or perhaps save lives.

A turbine generator set transforms mechanical energy into electrical energy to produce electricity. Natural gas, coal, nuclear fission, biomass, petroleum, geothermal, and solar thermal are examples of energy sources where the heat generated is used to produce steam.

Thus, option B is correct.

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Explanation:

Work = power × time

W = (6000 W) (7.5 s)

W = 45,000 J

Answer:

F = 0.32 N

Explanation:

GIVEN:

Mass = m =  200 g = 0.2 kg

Distance = S = 200 cm = 2 m

Time = t = 5 s

Initial velocity = U = 0 m/s

REQUIRED

Force = F = ?

SOLUTION

Using Second Equation of Motion,

S = Ut + 1/2 at²

2 = (0)(5) + 1/2 a(5)²

2 = 25/2 a

a = 4/25

a = 0.16 m/s²

So,

Acceleration = a = 0.16 m/s²

Now Using Equation from Newtons Second Law of Motion

F = ma

F = (2)(0.16)

F = 0.32 N

Answer: Dear Buddy ,the common brnches os physics are given below:

Explanation:

Mechanics

Classical physics

Modern physics

Thermodynamics

Electricity

Magnetism

Geo physics

Plasma physics

Optics

Sound and oscillation

Electronics

Chemical physics

Engineering physics

Solid state physics

Quantum physics

Nuclear physics

Particle physics

Bio physics

Astrophysics

Condensed matter physics

hope it helps

Answer:

Engineering is one of branches that uses physics mainly the most

Explanation:

as for engineering requires mathematics and physics principles in their everyday routine to calculate and measure accordingly to manufactur a product.

Answer:

visual art in which one uses to mark drawing and express feelings

Explanation:

In my own opinion. Hope it helps.

Answer: C. (Force = 2, time = 4.5)

Explanation:

J = FΔt

A. J = 5*2

A. J = 10

B. J = 1*8.5

B. J = 8.5

C. J = 2*4.5

C. J = 9

D. J = 3*2

D. J = 6

Answer:

C. (Force = 2, time = 4.5)

Answer:

the radiation pressure that has to push the star

Explanation:

In the stars there are two forces that act in the opposite direction.

- On the one hand there is the force of gravity that the star has to collapse

- On the other is the radiation pressure that has to push the star. This pressure comes from the radiation and velocity of the particles involved in nuclear reactions.

Answer:

10m/s

Explanation:

collisions results in objects sticking together or not sticking together after collision and so they do move with a common velocity or uncommon velocity respectively.

Parameters from the question:

Mass of green billiard balls, m1=2kg

Mass of white billiard balls, m2=2kg

Initial velocity for green billiard balls ,u1=4m/s

Initial velocity for white billiard balls ,u2 = 0m/s( since the body is at rest meaning it wasn't moving)

Final velocity of green billiard ball after collision is,v1= unknown

Final velocity of white green billiard ball after collision is, V2 = -6m/s.

Now from Newton's third law of motion that action and reaction must be equal and opposite;hence change in momentum before collision would be the same after collision since energy is conserved.

Hence,

m1U1 + m2U2 = m1V1 +m2V2

2×4 + 2×0 = 2×V1 + 2× (-6)

8 = 2V1 -12

8+12=2V1

20=2V1

10=V1

V1=10m/s

Answer:

Electric current.

Explanation:

The energy result from electric current resulting from potential differences between terminals which form an Electric circuit. This energy could come from different sources like chemical, wind, light

An electric circuit is one where there is movement of electrons;this electrons acquire charge which is energy. The electrons flow due to a potential difference; you have heard water flows from a higher position to a lower one freely. The highest height is said to be at higher potential and the lower point low potential.

So it's the same with electrons.

The formular for energy on charge is Q= I × t where I is electric current and t is time.

Answer:

any object that has density more than 1.4

Explanation:

The object that has density more than 1.4 is denser than the honey

Answer:

A

Explanation:

KE = 1/2 mv^2

=1/2(30kg)( 3.4 m/s)^2

=173.4 joules

=1.7×10^2 joules

Acceleration = (change in speed) / (time for the change)

Change in speed = (speed after the change) - (speed before the change)

Change in speed = (65 m/s) - (35 m/s)  =  30 m/s

Acceleration = (30 m/s) / (5 s)

Acceleration = 6 m/s²

Answer: 35

Explanation:

Given the following :

M = 0.5 kg

Power of heater = 100W

From the graph ;

Time (t) = 7seconds

Change in temperature(Dt) = t2 - t1

Where t2 = 70°C, t1 = 30°C

Dt = (70 - 30)°C = 40°C

Recall Q = iVt

IV = power

Q = mcDt

c = specific heat capacity of liquid

mcDt = ivt

mcDt = power × t

0.5 × c × 40°C = 100 × 7

20°C × c = 700 J

c = 700 J/ 20°C

c = 35 J / kg°C

Answer:

-8.4°C

Explanation:

From the principle of heat capacity.

The heat sustain by an object is given as;

H = m× c× (T2-T1)

Where H is heat transferred

m is mass of substance

T2-T1 is the temperature change from starting to final temperature T2.

c- is the specific heat capacity of ice .

Note : specific heat capacity is an intrinsic capacity of a substance which is the energy substained on a unit mass of a substance on a unit temperature change.

Hence ; 35= 1× c× ( T2-(-25))

35= c× ( T2+25)

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°{ approximated to 2 decimal place}

T2= 16.60-25= -8.40°C

C, specific heat capacity of ice is =2.108 kJ/kgK{you can google that}

To solve this we must be knowing each and every concept related to energy. Therefore, -8.40°C is the final temperature of the ice.

In physics, energy is the capacity to accomplish work. It can be potential, kinetic, temperature, electrical, chemical, radioactive, or in other forms.

There is also heat and work—energy inside the process of being transferred through one body to the other. Energy is always classified according to its type once it has been transmitted. As a result, heat transported could become thermal energy, whereas labor done may emerge as mechanical energy.

H = m× c× (T2-T1)

35= 1× c× ( T2-(-25))

35= c× ( T2+25)

specific heat capacity of ice is =2.108 kJ/kgK

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°

T2= 16.60-25= -8.40°C

Therefore, -8.40°C is the final temperature of the ice.

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Answer:

The new force becomes 3 times of the initial force.

Explanation:

Let q₁ and q₂ are two charged particles. The force between them is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}\ ......(1)[/tex]

If [tex]q_1'=\dfrac{q_1}{4}[/tex]

and

[tex]q_2'=3q_2[/tex]

Also, r' = r/2

New force,

[tex]F'=\dfrac{kq_1'q_2'}{r'^2}[/tex]

Putting all the above values,

[tex]F'=\dfrac{k\dfrac{q_1}{4}3q_2}{(r/2)^2}\\\\F'=3\times \dfrac{kq_1q_2}{r^2}\\\\F'=3F[/tex]

So, the new force becomes 3 times of the initial force.

Answer:

[tex]\mathbf{\dfrac{I(5l)}{I(l) } =10^{-8}}[/tex]

Explanation:

We are being told that the current is proportional to the tunneling coefficient[tex]I(l) = I_0 e^{-2kl}[/tex] ;

where l = distance between the tip and the surface.

Let      [tex]I(l) = I_0 e^{-2kl}[/tex]        ------------  equation (1)

and     [tex]I(5l) = I_0 e^{-2k(5l)}[/tex]   ------------ equation (2)

Dividing equation (2) by (1); we have :

[tex]\dfrac{I(5l)}{I(l) } = \dfrac{I_0 e^{-2k(5l)}}{ I_0 e^{-2kl}}[/tex]

[tex]\dfrac{I(5l)}{I(l) } =e^{-2k(5-1)l}[/tex]

[tex]\dfrac{I(5l)}{I(l) } =(e^{-2kl})^4[/tex]

where ;

[tex](e^{-2kl})[/tex] represents the transmission coefficient T = 0.01

Thus; replacing the value for 0.01;we have;

[tex]\dfrac{I(5l)}{I(l) } =0.01^4[/tex]

[tex]\mathbf{\dfrac{I(5l)}{I(l) } =10^{-8}}[/tex]

Answer:

True

Explanation:

Answer:

v = 0.3 ms⁻¹

Frequency = 4.8 Hz

T = 0.21 sec

Explanation:

The rate of oscillation is 4.8 oscillation/second

Let's see frequency's definition " no. of vibration/oscillation per unit time"

So,

Frequency = 4.8 Hz

Now

Time period is the reciprocal of frequency

T = 1/f

T = 1/4.8

T = 0.21 sec

Now

Using formula

v = f λ

f = 4.8 Hz , λ = 6 cm (But we need to convert it in a standard form)

So, λ = 0.06 m

Putting in formula

v = (4.8)(0.06)

v = 0.3 ms⁻¹

Answer:

Explanation:

If you look at the chemistry behind most brake fluid, it comes from the combination of various types of glycols, which are basically a mixture of non-petroleum and other alcohol-based fluids. After a mixing process, the chemical name gets shortened to “polyglycol”. In addition, there are also high-grade silicone-based fluids, which cannot be mixed with any other type of fluid. So whether it's used in the brake or clutch system, it's important to understand the differences between these common types of brake fluid.

The brake fluid must maintain specific properties. Our brakes can get hot, sometimes up to 1200 degrees, so the fluid needs a high boiling point. Also, because our vehicles experience seasons just as we do, it’s important to have low freezing point as well. On top of maintaining both extremes, it's designed not to damage any rubber components in the brake system.

As a result, the chemical properties found in most brake fluids can permanently dull or damage paint. So be sure to handle with care and be quick to clean any accidental overspills. Brake fluid is hydroscopic, meaning it has a natural tendency to absorb moisture. And over enough time the added moisture can result in corrosion build up or a decreased boiling point. It’s never a bad idea to change your brake fluid every couple of years and try not to leave your reservoir cap off any longer than needed

Answer: high operation temperatures, good low-temperature and viscosity-temperature properties, physical and chemical stability, protection of metals from corrosion, inactivity with respect to mechanical rubber articles, and lubricating effect

Hope this helps

Explanation:

K = 5kg[tex](2 m/s)^{2}[/tex]/2 = 10 J

The exact same.  gravity has no effect on mass.

Answer:

Explanation:

Answer:

1,650 meters

Explanation:

Start by converting the velocity to m/s. There are 3600 seconds in a minute and 1000 meters in a kilometer, so 90km/hr=25m/s. Half a minute is 30 seconds, so:

[tex]d=v_ot+\dfrac{1}{2}at^2 \\\\d=(25)(30)+\dfrac{1}{2}(2)(30)^2 \\\\d=750+900=1650m[/tex]

Hope this helps!

party and being happy..........

The reason why a delivery truck filled with birds sitting on the floor be heavier than a truck with the same birds flying around is because when the birds are sitting on the floor, they are adding their weight to the truck.

Meanwhile, if the birds are flying around they aren't resting on the truck or touching it, so therefore their weight wouldn't be added to the truck.

The mass of the truck will remain the same as you cannot change the mass but the weight will vary depending on the items and objects placed in it.

Answer:

NO

Explanation:

Since iron is a metal and carbon is a non- metal, they cannot form a metallic bond.

Answer:

a. 45 N. / b. 0.08 m/s^2. / c. 102 N

F = ma

F = 15(3)

F = 45 newtons

F/m = a

20/250 = a

0.08 m/s^2 = a

R = ma

R =1.5(68)

102 N

Answer:

Explanation:

The quantity of heat required to raise the temperature of water to 100 degrees is expressed as

[tex]Q= mc(T2-T1)[/tex]

Given data

mass of water = 5kg

initial temperature T1= 20 °C

final temperature T2= 100 °C

Specific heat capacity of water=  4 200 J/Kg °C

[tex]Q= 5* 4 200(100-20)\\Q= 21000(80)\\Q= 1680000\\Q= 1680kJ[/tex]

Answer:

a. 1.8 kV b. 30 A c. power input = 3.6 kW, power output = 3.6 kW

Explanation:

a. Since turns ratio N₁/N₂  = V₁/V₂ where N₁ = number of turns of primary coil = 80 turns, N₂ = number of turns of secondary coil = 1200 turns, V₁ = voltage in primary circuit = 120 V and V₂ = voltage in secondary circuit = unknown

So, V₂ = N₂V₁/N₁

= 1200 × 120 V/80

= 1800 V

= 1.8 kV

b. Also, N₁/N₂ = I₂/I₁ where I₁ = current in primary circuit = unknown and I₂ =  current in secondary circuit = 2.0 A

So, I₁ = N₂I₂/N₁

= 1200 × 2.0 A/80

= 30 A

c. The power input of the transformer P₁ = I₁V₁

= 30 A × 120 V

= 3600 W

= 3.6 kW

The power output of the transformer P₂ = I₂V₂

= 2 A × 1800 V

= 3600 W

= 3.6 kW

a) The voltage applied across the secondary circuit is 1.8 kV

b) The current in the primary circuit is  30 A

c) The power input and output of the transformer are 3.6 kW and 3.6 kW.

A transformer transfers electric energy from one AC circuit to one or more other circuits, either stepping up or stepping down the voltage.

a)  Turns ratio N₁/N₂  = V₁/V₂ where N₁ = number of turns of primary coil = 80 turns, N₂ = number of turns of secondary coil = 1200 turns, V₁ = voltage in primary circuit = 120 V

Substitute the values and we get the voltage in secondary circuit is

V₂ = N₂V₁/N₁

V₂ = 1200 × 120 V/80

V₂ = 1800 V

V₂ = 1.8 kV

Thus, the voltage applied across the secondary circuit is 1.8 kV

b) Turn ratio also represented as  N₁/N₂ = I₂/I₁ where  I₂ is the current in secondary circuit = 2.0 A
Put the values, we have current in primary circuit is

I₁ = N₂I₂/N₁

I₁ = 1200 × 2.0 A/80

I₁ = 30 A

Thus, the current in the primary circuit is  30 A

c) The power input of the transformer P₁ = I₁V₁

P₁ = 30 A × 120 V

P₁ = 3600 W

P₁ = 3.6 kW

The power output of the transformer P₂ = I₂V₂

P₂= 2 A × 1800 V

P₂= 3600 W

P₂= 3.6 kW

The power input and output of the transformer are 3.6 kW and 3.6 kW.

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