Which statements correctly describe motion and forces that
affect it? Select all statements that apply.
Please help!!

Answer:

2.47 s

Explanation:

Convert the final velocity to m/s.

We have the acceleration of the gazelle, 4.5 m/s².

We can assume the gazelle starts at an initial velocity of 0 m/s in order to determine how much time it requires to reach a final velocity of 11.1111 m/s.

We want to find the time t.

Find the constant acceleration equation that contains all four of these variables.

Substitute the known values into the equation.

The Thompson's gazelle requires a time of 2.47 s to reach a speed of 40 km/h (11.1111 m/s).

Answer:

a. The magnitude of the resultant velocity vector of the fish is approximately 5.83 m/s

The direction of the resultant velocity vector of the fish is approximately 30.93° relative to the direction of the river

b. The magnitude of the resultant velocity vector of the surfer is approximately 6.083 m/s

The direction of the resultant velocity vector of the surfer is approximately 9.46° relative to the direction of the wave

Explanation:

a. The given parameters of the fish and the river are;

The speed with which the fish is swimming across the river, v₁ = 3.0 m/s

The velocity  with which the river is flowing, v₂ = 5.0 m/s

Therefore, in vector form, we have;

v₁ = 3.0·j

v₂ = 5.0·i

The resultant velocity, R = v₁ + v₂ = 5.0·i + 3.0·j

∴ R = 5.0·i + 3.0·j

The magnitude of the resultant velocity vector, [tex]\left | R \right |[/tex] = √(5.0² + 3.0²) =√34 ≈ 5.83

The magnitude of the resultant velocity vector,  of the fish,  [tex]\left | R \right |[/tex]  ≈ 5.83 m/s

The direction of the resultant velocity of the fish, θ = arctan(3.0/5.0) ≈ 30.93°

Therefore, The direction of the resultant velocity vector of the fish, θ ≈ 30.93° relative to the direction of the river

b. The given parameters of the surfer and the wave are;

The speed with which the surfer is travelling, v₁ = 1.0 m/s

The speed of the wave travelling across, v₂ = 6.0 m/s

Therefore, in vector form, we have;

v₁ = 1.0·j

v₂ = 6.0·i

The resultant velocity, R = v₁ + v₂ = 1.0·i + 6.0·j

∴ R = 1.0·i + 6.0·j

The magnitude of the resultant velocity of the surfer, [tex]\left | R \right |[/tex] = √(1.0² + 6.0²) =√37 ≈ 6.083

The magnitude of the resultant velocity vector of the surfer, [tex]\left | R \right |[/tex]  ≈ 6.083 m/s

The direction of the resultant velocity of the surfer, θ = arctan(1.0/6.0) ≈ 9.46°

Therefore, The direction of the resultant velocity vector of the surfer, θ ≈ 9.46° relative to the direction of the wave

Answer:

Broken glass

Explanation:

Answer:

P = r g h   where r here is the density m / V and then P is the pressre.

W (weight) = m g

m = 10 N / 9.8 m / s^2 = 1.02 kg

r (density) = m / V = 1.02 kg / 1000 cm^3 = .00102 kg/cm^3

P = .00102 kg / cm3 * 9.8 m/s^2 * 10 cm

P = .1 kg m / (s^2 cm^2)

Since 1  N = kg m / s^2    then P = .1 N / cm^2

More simply P = F / A = 10 N / 100 cm^2 = .1 N / cm^2

Answer:

81

Explanation:

The problem here is to use the rules for significant figures in the multiplication below.

       67.6 x 1.2:

 This product will yield an answer that will produce the least number of significant figures.

   67.6 has 3 significant figures; 6, 7 and 6

    1.2 has 2 significant figures; 1 and 2

The product must give us an answer of two significant figures:

        67.6 x 1.2  = 81.12 to 2significant figures gives 81

The solution to this problem is 81

We know that,

[tex]{\boxed{\sf{v=u+gt}}}[/tex]

[ Put values ]

[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]

Therefore, the time at which the stone reaches its maximum height will be 2.04 s.

Answer:

Explanation:

Given

Mass = m

Time = t

Force = mass × acceleration ..... 1

Where acceleration = velocity/time

Ave Force = m×∆v/∆t

= mv/t

Answer:

WIND

Explanation:

EDG 2021

If A homeowner wants to reduce the environmental damage of the energy source used to heat her home. Then wind energy source would be best for her to choose. The correct option is D.

Wind energy is a form of renewable energy that is generated by harnessing the power of the wind to produce electricity.

Wind energy is produced when the kinetic energy of the wind is converted into mechanical energy by wind turbines.

Wind turbines are typically large, tower-like structures with rotor blades that spin in response to the wind, turning a generator that produces electricity.

Wind energy is a clean and sustainable source of energy that does not produce greenhouse gas emissions or air pollution, unlike fossil fuels such as coal, oil, and gas.

Wind energy is also abundant and widely available, with many regions around the world experiencing consistent wind speeds that can be harnessed to generate electricity.

As a result, wind energy has become an increasingly popular source of renewable energy, with many countries investing in wind power as part of their efforts to transition to a cleaner, more sustainable energy system.

Here in the question,

To reduce the environmental damage of the energy source used to heat her home, the homeowner should choose wind energy. Wind energy is a clean and renewable source of energy that does not produce harmful greenhouse gases or air pollution, which can contribute to climate change and negatively impact human health.

In contrast, coal, gas, and oil are all fossil fuels that produce significant amounts of carbon dioxide and other pollutants when burned, contributing to air pollution, climate change, and other environmental problems.

Therefore, wind energy is a better choice for the homeowner who wants to reduce the environmental impact of heating her home.

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Answer:

ecdbaf

Explanation:

The logical order of the steps of the scientific method is as follows:

a. analyze the data -- 5

b. test the hypothesis - 4

c. form a hypothesis - 3

d. gather information - 2

e. state the problem - 1

f. draw conclusions - 6

Each experiment and research uses the scientific method to test their hypothesis or solving the problem. The scientific method is a step-by-step process to acquire knowledge about a particular problem. There are the following steps in the scientific method

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Answer:

Explanation:

The acceleration of an object is given by the formula

a = v²/r

The acceleration of the object is bound to increase, if and only if the following are changed as well.

The mass of the object is increased,

The speed of the object is increased,

The radius of the object is contrarily decreased

Taking another look at the formula, we see that if we increase the speed of the object, it increases the acceleration. And since the radius is in the denominator, it has to be reduced for the acceleration to increase

Answer:

v2 = 0.6 m/s in opposite direction

Explanation:

The computation of the speed of the raft is as follows

The center of system mass would be remains at the same place also it has no external force applied

Therefore

V = 0

So,  

M1.V1= - (M2.V2)

where,

M1 = 60 kg, V1 = 1.5 m/s

M2 = 150 kg

Now  

60 × 1.5 = - 150 × v2

v2 = -0.6 m/s

v2 = 0.6 m/s in opposite direction

The speed of air greatest in a medium with high pressure. Air is moving from high pressure to low pressure areas called the winds.

The natural movement of air or other gases in relation to a planet's surface is referred to as wind. There are many different sizes of winds, ranging from thunderstorm flows that last only a few minutes to local breezes.

Large-scale atmospheric circulation is primarily brought on by the planet's rotation and the difference in temperature between the equator and the poles (Coriolis effect).

The air can move through a medium as well through vacuum. Air blows with the highest speed when the medium have higher temperature and pressure.

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Answer:

Jennifer

Explanation:

she has more mass which means she is using more force

Answer:125 J

Explanation:

Given

Mass of block [tex]m=10\ kg[/tex]

Initial velocity [tex]u=0\ m/s[/tex]

Final velocity [tex]v=5\ m/s[/tex]

According to the work-energy theorem, work done by all the forces is equal to the change in kinetic energy.

As the block is on the horizontal surface so, the work done by gravity is zero.

Work(W)=change in kinetic Energy

[tex]W=\dfrac{1}{2}m[v^2-u^2]\\W=\dfrac{1}{2}\times 10\times [5^2-0^2]=125\ J[/tex]

Given :

A 1200 kg truck traveling at 20 m/s towards the east.

To Find :

The magnitude and direction of the momentum.

Solution :

We know, momentum is given by :

Momentum, P = mv

P = 1200 × 20 kg m/s

P = 24000 kg m/s

Now, we know, direction of momentum is same as the direction of velocity.

Therefore, momentum of truck is 24000 kg m/s and direction is towards the east.

Answer:

Yes, because the wrench is moving at the same speed as the sailboat.

The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,

This difference in paths lead to the relativistic change in lengths.

Answer:

a

Explanation:

Answer: reflection

Explanation:

Answer:

See the explanation.

Explanation:

Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.

Q10.

i) Periscope

ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.

Answer:

5kg

Explanation:

The cart with the least amount of mass will result in the fastest acceleration.

The cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

The given parameters;

According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.

F = ma

The acceleration of the 5 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{5} = 18 \ m/s^2[/tex]

The acceleration of the 6 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{6} = 15 \ m/s^2[/tex]

The acceleration of the 8 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{8} = 11.25 \ m/s^2[/tex]

The acceleration of the 9 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{9} = 10 \ m/s^2[/tex]

Thus, the cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

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Answer:

I think the answer is C. for 4. and then B. for 5.

Answer:

F = 85696.5 N = 85.69 KN

Explanation:

In this scenario, we apply Newton's Second Law:

[tex]Unbalanced\ Force = ma\\Upthrust - Weight\ of\ Space\ Craft = ma\\F - W = ma\\F - mg = ma\\F = m(g + a)\\[/tex]

where,

F = Upthrust = ?

m = mass of space craft = 5000 kg

g = acceleration due to gravity on surface of Kepler-10b = (1.53)(9.81 m/s²)

g = 15.0093 m/s²

a = acceleration required = 2.13 m/s²

Therefore,

[tex]F = (5000\ kg)(15.0093\ m/s^{2} + 2.13\ m/s^{2})\\[/tex]

F = 85696.5 N = 85.69 KN

Answer: it is actually B. :)

Explanation:

Noise can distort analog signals making them unreliable.

Noise can actually bury, distort or cause interference to the analog signal carrying the intelligent information.

Hence, the correct answer is B.

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Answer:

The net force is 20 N and the acceleration of the block is [tex]5\ m/s^2[/tex]

Explanation:

Given that,

Mass of the block, m = 4 kg

Force in right side = 30 N

Force in left side = 10 N

We need to find the net force and the acceleration of the block.

Net force = Right force - left force (as both are opposite to each other)

= 30 N - 10 N

= 20 N

Formula for net force,

F = ma

a is acceleration

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{20\ N}{4\ kg}\\\\a=5\ m/s^2[/tex]

Hence, the net force is 20 N and acceleration of the block is [tex]5\ m/s^2[/tex].

Answer:

Loop of Wire

Explanation:

Answer:

the final velocity of the wagon is 6 m/s.

Explanation:

Given;

initial velocity of the wagon, u = 4 m/s

mass of the wagon, m = 35 kg

energy applied to the wagon, E = 350 J

The final velocity of the wagon is calculated as;

E = ¹/₂m(v² - u²)

[tex]m(v^2-u^2) = 2E\\\\v^2-u^2 = \frac{2E}{m} \\\\v^2 = \frac{2E}{m} + u^2\\\\v = \sqrt{\frac{2E}{m} + u^2} \\\\v = \sqrt{\frac{2(350)}{35} + (4)^2}\\\\v = 6 \ m/s[/tex]

Therefore, the final velocity of the wagon is 6 m/s.

Given:

Wagon's initial velocity,

Mass,

Applied energy,

We know,

→ [tex]E = \frac{1}{2} m(v^2-u^2)[/tex]

→ [tex]m(v^2-u^2) = 2E[/tex]

or,

→      [tex]v^2-u^2 = \frac{2E}{m}[/tex]

→               [tex]v= \sqrt{\frac{2E}{m} +u^2}[/tex]

By substituting the values,

                    [tex]= \sqrt{\frac{2(350)}{35}+(4)^2 }[/tex]

                    [tex]= 6 m/s[/tex]

Thus the answer above is correct.  

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Answer: Did you get the answers to any of this report?

Explanation:

Answer:

1 year later and still not answered....

Explanation:

Answer:

A lot of Dietary Fiber.

Explanation:

Answer:

Red apples get their color from anthocyanins. These are pigments, or natural colorings, that develop as the apple grows. ... It absorbs all the colors of the rainbow—except for red. The red light reflects off the apple and our brain and eyes work together to let us know what color we are seeing.

Answer:

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Two positive points charges repel each other with force 0.36 N when their separation is 1.5 meter . Then the force exerted by two charges when the distance is 1.0 meter is 0.8 N.

Calculation:

R1 = 1.5 meter

R2 = 1 meter

F1 = 0.36 N

F1/F2 = R2^2/R1^2

F2 = R1^2/R2^2 × F1

F2 = 2.25 / 1 × 0.36

F2 = 0.81

Electrostatic force is type of force which act between two charges it is  repulsive or attractive in nature.  If both charge in same type then it will be repulsive and when both are in opposite nature then it will be attractive in nature.

Mathematically,

F = k× Q1× Q2/r^2

So,

In above problems

R1 = 1.5 meter

R2 = 1 meter

F1 = 0.36 N

F1/F2 = R2^2/R1^2

F2 = R1^2/R2^2 × F1

F2 = 2.25 / 1 × 0.36

F2 = 0.81

Therefore, Two positive points charges repel each other with force 0.36 N when their separation is 1.5 meter . Then the force exerted by two charges when the distance is 1.0 meter is 0.8 N.

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