A boat is rowed perpendicular to the shore of a river that flows at 3.0 m/s as shown in the
figure. The velocity of the boat is 4.0 m/s relative to the water. What is the magnitude of the
velocity of your boat relative to the shore?

A-5 m/s
B-10 m/s
C-15 m/s
D-20 m/s

Answer:

10 kg rock at 15 degrees

Explanation:

did test

Answer:

120

Explanation:

lambda = 12

f=10

10×12=120

Answer:

Explanation:

Factors which affects and impacts our environment may include water, sunlight, buildings and so many other. The factors which can touched are called the physical factors. The physical factirs include buildings, humans and so on. Other factirs which aren't physical inckide the the effects posed to the environment t by biological and chemical factirs which may include, the impacts in sunlight and Rainfall, the pH and so on.

Answer:

It means that the frequency will be a lot higher with a shorter wave.

Answer:

the final velocity of the bus is -20 m/s.

Explanation:

Given;

initial velocity of the bus, u = 20 m/s

deceleration of the bus, -a = 8 m/s²

time of motion, t = 5 s

The final velocity of the bus is calculated as;

v = u + at

v = 20 + (-8 x 5)

v = 20 - 40

v = -20 m/s.

Therefore, the final velocity of the bus is -20 m/s.

Answer: This is true

Explanation: v2=800/25= 32m/s

Answer:

last one

Explanation:

Answer:

1. Two materials that can be scratched by an iron nail are zinc and aluminum

2. A substance that can be scratched by an iron nail but not a penny is;

Nickel

Explanation:

The hardness of a material can be defined as its ability to resist being plastically deformed at a location due to mechanical scratching, abrasion or indentation

The Mohs hardness scale provides a ranking of materials in the order of hardness with a material having a higher Mohs hardness number being able to scratch other materials which have a lower Mohs hardness number

1. From the Mohs scale of hardness, iron which has an harness number of 4.5 can scratch zinc which has an harness number of 2.5, and iron can also scratch aluminum which has an hardness number of 2.5 to 3

2. A penny is made from copper plated material and will have an outer layer hardness of copper which has an hardness number of 3 on the Mohs scale

Therefore, a penny cannot scratch a material mode of nickel which has an hardness number of 4, while iron which has an hardness of 4.5 will scratch a nickel material

(1) Zinc and aluminum can be scratched by an iron nail.

(2) Nickel can be scratched by an iron nail but not a penny.

The hardness of a material is defined as its ability to resist deformation due to mechanical scratching, abrasion, or indentation.

According to the Mohs hardness scale, a material having a higher Mohs hardness number is able to scratch other materials which have a lower Mohs hardness number.

From the Mohs scale of hardness, iron has a hardness number of 4.5, zinc has a hardness number of 2.5, and aluminum which has a hardness number between 2.5 to 3. So, iron can scratch both, Zinc and Aluminium.

A penny is made from copper-plated material copper has a hardness number of 3 on the Mohs scale. Whereas Nickel has a hardness number of 4. Therefore, a penny cannot scratch a material made of Nickel.

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P=F/A

A=foot1+foot2

A=0.05m2+0.05m2 because it says by two foot

A=0.10m2

>>F=mg=80kg*9.81m/s2=784.8N

P=784.8N/0.10m2

P=7848Pa

Answer:

inertia

..............

Answer:law of inertia

Explanation:

Answer:

c

Explanation:

The element is Magnesium as it can form s a +2 ionic charge, and has 3 energy levels. Therefore, option A is correct.

The ionic charge can be described as the oxidation state of the chemical species. The cation exhibits a positive charge while the anion exhibits a negative charge. The number of valence electrons in atoms decides the charge carried by their ions.

In the modern periodic table, the chemical elements from the left side are electropositive and usually act as metals.  The metals donate one or more electrons thus they usually carry a positive charge on ions.

In the periodic table, the chemical elements from the right end are electronegative and usually act as non-metals. The non-metals can accept electrons thus they form anions.

The valence shell configuration of magnesium is 3s². Magnesium (Mg) can donate two electrons from its valence shell and carry a +2 ionic charge.

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Answer:

v_f = 10.85 m/s

Explanation:

We will apply the law of conservation of momentum here:

[tex]m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{1f}+m_{2}v_{2f}\\[/tex]

where,

m₁ = mass of roller skater = 47 kg

m₂ = mass of bag = 6 kg

v_1i = initial speed of roller skater = 12 m/s

v_2i = initial speed of the bag = 0 m/s

v_1f = final speed of the roller skater = ?

v_2f = final speed of the bag = ?

Both the bag and the skater will have same speed at the end because kater is carrying the bag:

v_1f = v_2f = v_f

Therefore, the equation will become:

[tex](47\ kg)(12\ m/s)+(6\ kg)(0\ m/s)=(47\ kg)(v_{f})+(5\ kg)(v_{f})\\564\ N.s = (47\ kg+5\ kg)(v_{f})\\v_{f} = \frac{564\ N.s}{52\ kg}\\[/tex]

v_f = 10.85 m/s

Answer:

i know i'm way late. i'm so sorry but the answer is b not c. i just took the test and got 90% this one is wrong. it's B

Explanation:

just took the test.

hope this helps!

have a good day/ night

When a branch is added to a parallel circuit, the total resistance decreases, so the current in the circuit increases.

A parallel circuit is defined as the type of circuit in which the resistors are connected in parallel such that the current flowing through each of them is different.

Here,

The given circuit is connected in parallel combination of resistors. The current has different pathways to flow through. The voltage applied across each resistors will be the same.

Consider a parallel resistance circuit having a combination of n number of resistors with resistance R. The effective resistance of the parallel circuit can be given as,

1/Reff = 1/R₁ + 1/R₂ + 1/R₃ +....1/Rₙ

Since, the resistance is same on all resistors, we can write,

Reff = R/n

So, when adding a branch, the number of resistors, n increases. As a result, the effective resistance of the circuit decreases.

According to Ohm's law, as the resistance of a circuit decreases, the flow of current through the circuit increases.

Hence,

When a branch is added to a parallel circuit, the total resistance decreases, so the current in the circuit increases.

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Answer:

Atomic mass 5

Explanation:

No. protons=Atomic mass

Answer:

[tex]100\ \text{meters}[/tex].

Explanation:

Distance Skylar traveled North is [tex]50\ \text{meters}[/tex]

Then she traveled [tex]30\ \text{meters}[/tex] Westward.

After which she traveled [tex]20\ \text{meters}[/tex] towards the South.

The total distance traveled would be the sum of the distances.

[tex]50+30+20=100\ \text{meters}[/tex]

The distance traveled by Skylar was is [tex]100\ \text{meters}[/tex].

Answer:

hmmdndbdjjdjdhdjejjejdjdhdudududjhdhdhdhd

I hope this helps.......

Answer:

12 N to the Right

Explanation:

12 N is the answer for the first box and right is the answer for the second box

Answer:  when the full moon moves through Earth’s shadow, which only happens when Earth is between the Moon and the Sun and all three are lined up in the same plane, called the ecliptic  In an eclipse, Earth’s shadow has two distinct parts the umbra and the penumbra. The umbra is the inner, cone-shaped part of the shadow, in which all of the light has been blocked. The penumbra is the outer part of Earth’s shadow where only part of the light is blocked. In the penumbra, the light is dimmed but not totally absent.

Answer:

the answer is C. 3 hopefully this will help

Answer:

Ex.

1. When we try cycling when we push the padel cycle starts but if we do not push the padels the cycle will stop on one position........

Answer:

Ok

Explanation:

Speed

Answer:

K=1/2mv^2=(20x81)/2=810J

Answer:

The Sun is the Ultimate Source of Energy. Every morning the sun rises, bringing light and heat to the earth, and every evening it sets. ... Plants convert light energy from the sun into chemical energy (food) by the process of photosynthesis. Animals eat plants and use that same chemical energy for all their activities.

Answer:

40.56Hertz

Explanation:

v=f×lamda( I don't have the symbol)

from the question,

v=23,000

f=?

lamda i.e wavelength=567m

therefore, 23000=f×567

divide by 567

23000/567=567f/567

40.56 Hz=f

so, f=40.56Hz

Answer:

If Kepler’s laws define the motion of the planets, Newton’s laws define motion. Thinking on Kepler’s laws, Newton realized that all motion, whether it was the orbit of the Moon around the Earth or an apple falling from a tree, followed the same basic principles. “To the same natural effects,” he wrote, “we must, as far as possible, assign the same causes.” Previous Aristotelian thinking, physicist Stephen Hawking has written, assigned different causes to different types of motion. By unifying all motion, Newton shifted the scientific perspective to a search for large, unifying patterns in nature. Newton outlined his laws in Philosophiae Naturalis Principia Mathematica (“Mathematical Principles of Natural Philosophy,”) published in 1687.

Law I. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed theron.

In essence, a moving object won’t change speed or direction, nor will a still object start moving, unless some outside force acts on it. The law is regularly summed up in one word: inertia.

Law II. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

Newton’s second law is most recognizable in its mathematical form, the iconic equation: F=ma. The strength of the force (F) is defined by how much it changes the motion (acceleration, a) of an object with some mass (m).

Law III. To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.

As Newton himself described: “If you press a stone with your finger, the finger is also pressed by the stone.”

Explanation:

Hope this helps I cant say what I wrote is 100% correct so use at your own risk.

Answer:

The distance the bird flew is approximately 2.59 meters

Explanation:

We list out the parameters in the question, and the required measurement as follows;

The mass of the Cuban bee hummingbird, m = 1.7 g = 0.0017 kg

The amount of work the bird does, W = 8.8 × 10⁻⁴ J

The amount of upward force the bird exerts, F = 3.4 × 10⁻⁴ N

Let 'd' represent the distance flown by the bird

(The downward force, [tex]F_g[/tex] = The weight of the bird, W

W = The mass of the bird, m × The acceleration due to gravity, g

The acceleration due to gravity, g ≈ 9.81 × 10 m/s²

∴ [tex]F_g[/tex] ≈ 0.0017 kg × 9.81 m/s² = 0.016677 N > F)

Given that the weight of the bird is larger than 'F', we assume that the force exerted by the bird is the net force, [tex]F_{NET}[/tex] = F

Therefore;

Work done, W = Net Force, [tex]F_{NET}[/tex] × Distance, d

∴ W = [tex]F_{NET}[/tex] × d

d = W/[tex]F_{NET}[/tex] = 8.8 × 10⁻⁴ J/(3.4 × 10⁻⁴ N) = 2.58823529 meters

The distance the bird flew, d ≈ 2.59 m.