1. What was Swimmer C's average speed?

2. What was Swimmer A's average speed during the period 10 min to 20 min?

Answer:

Lunar eclipse

Explanation:

Lunar eclipse occurs when Earth comes in between sun and Moon. The moon is either partially or fully blocked and the moon sighting appears to be black from earth since the light rays coming from sun are blocked by Earth. Lunar eclipse occurs only at full moon. The moon is aligned with the position of earth and sun so that they all form a straight line.

Answer:

I'm pretty sure its product.

Explanation:

Hope this helps and have a wonderful day!!!!

Answer:

Car A has a velocity of 40 km/hr  west.

Explanation:

The velocity of an object is a vector quantity. It has both magnitudes as well as direction.

Arrows are used to show direction.

Car A is moving towards west. Car B is moving towards east-south direction. Car C is moving towards South direction. Car E is moving towards North direction.

So, the correct option is (a) i.e. Car A has a velocity of 40 km/hr  west.

Answer:

Explanation:

306.12 Kg,

Answer:

The mass of an object weighing 3000N is 300kg

Explanation:

Here,

Weight (W) = 3000N is given

So,

we will use

W = mg

where,

m = mass of the body

g = acceleration due to gravity

Now,

W = mg

3000 = m × 10

m = 3000 ÷ 10

m = 300kg

Thus, The mass of an object weighing 3000N is 300kg

-TheUnknownScientist

Answer:

the workenergy principle is measured in joules

Answer:

i) b. 14.3 Hz

ii) d. 0.4625 m/s

Explanation:

f = c / λ

f = frequency

c = speed

λ = wavelength

first question:

the given values,

λ = 2.17 m

c = 31 m/s

f = c / λ

f = 31 / 2.17

f = 14.28

∴ f = 14.3 Hz

second question:

given,

λ = 0.25 m

f = 1.85 Hz

f = c / λ

rearranging,

c = f × λ

c = 1.85 × 0.25

c = 0.4625

∴ c = 0.4625 m/s

(love your username, btw.)

Answer:

Number of electron wavelength will Double

Explanation:

let the radius = r  and wavelength = λ

when R doubles and  λ ( wavelength ) remains the same

The number of electron electron wavelengths will double as well

Using Bohr's angular momentum quantization to show this

attached below

Answer:

to find the weight, use the following formula

F= m x g

in Earth---> 45 x 9.8= 441 N

in Moon---> 45 x 1.6= 72 N

Explanation:

I HOPE THIS HELPS!!! :)

The change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

Gravitational potential energy is defined as the energy possessed by or acquired by an object due to a change in its position when it is present in a gravitational field. This can be said that gravitational potential energy is the energy which is related to the gravitational force or gravitation.

Gravitational potential energy is expressed as

U=m g h

Where, U = gravitational potential energy

m = mass

g = gravitational field

h = height

For above given example,

The change in gravitational potential energy for Earth

mass= 45kg

Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m

g= [tex]9.8m/s^2[/tex]

U= 45*16*9.8 = 7056J or 7.056kJ

The change in gravitational potential energy for Moon

mass= 45kg

Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m

g= [tex]1.6m/s^2[/tex]

U= 45*16* 1.6= 1152J or 1.152kJ

Thus, the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

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Answer:

Oxygen is abiotic

Explanation:

Answer:

yes it would u just wouldn't be able to hit him as hard as u would if u were using your dominate hand

Explanation:

Answer:

So work require will be 3888×10×10³J

Explanation:

⇒Work done=Change in kinetic energy

⇒KE=1/2mv²

⇒Mass->15000kg

⇒Velocity->72km/h

⇒KE=1/2×15000×(72)²

⇒KE=1/2×15000×5184

⇒KE=7500×5184

⇒KE=3888×10×10³J

Answer:

E = 0.4 kWh

Explanation:

Given that,

The power of a bulb, P = 40 W

Time, t = 10 hours

We need to find the energy used by the bulb. Let it is equal to E. So,

[tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]

So, 0.4 kWh of energy would be needed.

Answer: 146,000 Wh or 146 kWh

Explanation:

65 days × 10 hours × 40 W = 146,000 Wh or 146 kWh

Answer:

Option B

Explanation:

Looking at the 3 galvanometer readings given above, for galvanometer A, the reading is -2 mA.

For galvanometer B, the reading is 4 mA.

While for galvanometer C, the reading is -5 MA

Thus, option B is correct.

Answer:

B, the second picture

Explanation:

edge 2022

Answer:

The force exerted by the block on the floor is 38.4 Newtons

Explanation:

The given parameters are;

The area of the box in contact with the floor, A = 2.4 m²

The pressure exerted by the block on the floor, P = 16 N/m²

The force exerted by the box on the floor is given as follows;

[tex]Pressure, P = \dfrac{Force, F}{Area, A}[/tex]

∴ F = P × A

From the question, P = 16 N/m², and A = 2.4 m²

∴ F = 16 N/m² × 2.4 m² = 38.4 N

The force exerted by the block on the floor, F = 38.4 N.

Answer:

The Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex], the ratio of Astronomical Units per mile is [tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].

Explanation:

The distance from the Earth to the Sun is approximately [tex]92.96\times 10^{6}\,mi[/tex], then the Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex]. The ratio can be described by the quantity of miles per Astronomical Unit, then we define:

[tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].

Answer:

Answer:

The number of air molecules in her lung compared with the number she had in a full breadth at the surface is;

C. Twice as many

Explanation:

The depth at which the scuba diver fills her lungs with air, d = 10 m

Pressure of fluid = Density, ρ × Acceleration due to gravity, 'g' × Depth, 'd'

Where;

ρ = 970 kg/m³

g ≈ 9.81 m/s²

∴ The pressure of the water of the 10 m water column = 970 kg/m³ × 9.81 m/s² × 10 m = 95,157 Pa

The atmospheric pressure, P₁ = 101,325 Pa

The total pressure at the 10 m depth = The atmospheric pressure + The pressure of the water of the 10 m water column

∴ The total pressure at the 10 m depth, P₂ = 95,157 Pa + 101,325 Pa = 196,482 Pa

By the combined gas law, we have;

P₁·V₁/n₁ = P₂·V₂/n₂

Where;

P₁ = The atmospheric pressure

P₂ = The pressure at 10 m depth

V₁ = V₂ = The volume of her lungs

n₁ = The number of air molecules at the surface that fills her lungs

n₂ = The number of air molecules that fills her lungs at the 10 m depth

Therefore, we have;

P₂/P₁ = n₂/n₁ × V₁/V₂

From V₁ = V₂, we have;

P₂/P₁ = n₂/n₁ × V₁/V₁ = n₂/n₁ × 1

∴ P₂/P₁ = n₂/n₁

P₂/P₁ = 196,482/101,325 ≈ 2

∴ P₂/P₁  = n₂/n₁  ≈ 2

n₂ ≈ 2 × n₁

The number of air molecules that fills her lungs at the 10 m depth, n₂ is approximately 2 times (twice) as many as the number of air molecules at the surface that fills her lungs, n₁

Therefore the correct option is twice as many molecules as she had in a full breath at the surface is required to fill her lungs at the 10 m water depth.

This question involves the concepts of pressure, the equation of state, and the number of molecules.

The number of molecules in hr breathe are "C. twice as many" as compared to the number of molecules in her lungs when she had a full breath at the surface.

According to the equation of state:

[tex]\frac{P_1V_1}{n_1}=\frac{P_2V_2}{n_2}[/tex]

where,

n₁ = no. of molecules in lungs at surface

n₂ = no. of molecules in lungs at depth

P₁ = Pressure at surface = Atmospheric Pressure = 101325 Pa

P₂ = Pressure at depth = 101325 Pa + ρgh

P₂ = 101325 Pa + (1000 kg/m³)(9.81 m/s²)(10 m) = 199425 Pa

V₁ = V₂ = V = Volume of lungs

Therefore,

[tex]\frac{(101325\ Pa)V}{n_1}=\frac{(199425\ Pa)V}{n_2}\\\\[/tex]

n₂ = 2 n₁

Learn more about the equation of state also known as general gas law here:

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Answer:

A trees food and air source would be deprived because of this. Trees need leaves to perform photosynthesis, so besides their roots soaking up water and nutrients, they wouldn't have any other form of food until those leaves grow back. If they don't and the locusts continue to eat up the tree, it will eventually starve and die.

Explanation:

Imagine the trees trunk and roots as your body and the leaves as your mouth/food source. God Forbid you catch a cold or some sickness. You probably won't have the appetite to eat. Despite that, you'll still have to. But, if you get so sick to the point that eating just makes you throw it up before your body can take in the nutrients and beneficial stuff, you will eventually get to the point where eating is nearly impossible. This will lead up to the sickness taking over your body, as there's no energy going in to help it fight it off, and you would die.

(Gah, sorry for the dark theme... didn't think it would turn like that lol)

Anyways, hope this helped!

Source(s) used: N/A

Answer:

b im pretty sure (let me know if this is correct!) :)

Explanation:

Answer:

Jupiter Neptune moon Uranus

Explanation:

Answer:

Explanation: p = mass x velocity = m x v. • p = 1000 x 30 . The product of the force (F) acting on an object and applied force)  A 1000 kg Civic is traveling at 30 m/s and ... What is the momentum of the car after accelerating for ... If a 5kg object experiences a 10 N force . Solve: Honda, Camry, collision ... v = -15 m/s

Answer:

second law tells us that a body accelerates when the net force is not zero. ... for situations involving extremely high speeds (near the speed of light) or very ... forces applied at a point on a body have the same effect as a single force ... exerted by the worker, of magnitude 20 N

The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.

The amount of energy dissipated by an electrical appliance is the calculated using the following formulas;

P = I²R

where;

The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.

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Answer:

C. unlikely to combine with other elements.

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc.

Hence, the full octet makes the gas (neon) unlikely to combine with other elements.

Transparent objects allow all the light to pass through them, translucent ones allow partial light to pass, whereas opaque ones allow no light to pass through.

Answer:

Mechanical

Explanation:

The tank is at rest. And energy of any substance at rest is known as potential energy.

Now, in forms of energy, potential energy is a type of mechanical energy.

Thus, the correct option is mechanical Energy.

Answer:

Reflection of light means the bouncing back of light in another direction after hitting a smooth polished surface

1) Angie of incidence is equal to the angle of reflection

2) The nornal ray, reflected ray and the incident ray all lie in the same plane

Answer:

c

Explanation:

diluted means weakened

Another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

A weak solution may be defined as a type of solution that significantly partially dissociates into its ions in an aqueous solution or water. In contrast, a strong solution fully dissociates into its ions in water.

The concentration of the weak solution is found to be lower as compared to the strong solution. The word dilute also symbolizes the presence of less concentration in any solution.  

The main difference between weak and strong solutions is true that for strong solutions we are given a Brownian motion on a given probability space whereas for weak solutions we are free to choose the Brownian motion and the probability space.

Therefore, another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

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