Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h

Answer:

P = F d t = 10 ⋅ 20 30 = 6.7 W .

Explanation:

because

Answer:

Explanation:

Givens

vi = 0

a = 9.81

d = 4.50 m

vf = ?

Formula

vf^2 = vi^2 + 2 * a * d

Solution

Substitute the knowns into the formula

vf^2 =0 +  2 * 9.81 * 4.50

vf^2 = 88.29                          Take the square root of both sides.

sqrt(vf^2) = sqrt(88.29)    

vf = 9.40 m/s

Answer:

9.21 m

Explanation:

because this is the answer

Explanation:

Given that:

a→ = (i^ - 2j^ + 2k^)/3

b→ = (-4i^ - 3k^)/5

c→ = j^

Now,

| a | = √{(1/9) + (4/9) + (4/9)} = √{(1+4+4)/9} = √{(9/9)} = 1

| b | = √{(9/25) + (16/25)} = √{(9 + 16)/25} = √(25/25) = 1

| c | = 1

Now,

Let us assume that

⇛d→ = xi^ + yj^ + zk^ which makes equal angle

⇛α, β, γ with a→, b→, c→ respectively.

So, According to the statement,

⇛cos α = cos β = cos γ

⇛{(d→.a→)/(| d→ || a→ |)} = {(d→.b→)/(| d→ || c→|)} = {(d→.c→)/(| d→ || c→ |)}

⇛[{x-2y+2z}/{3√(x²+y²+z²)} = [{-4x - 3z}/{5√(x²+y²+z²)} = {y/√(x²+y²+z²)}

⇛{(x² - 2y + 2z)/3} = {(-4x - 3z)/5} = y

On Taking first and third member, we get

⇛{(x² - 2y + 2z)/3} = y

⇛{(x² - 2y + 2z)/3} = y/1

On applying cross multiplication then

⇛1(x² - 2y + 2z) = 3(y)

⇛x² - 2y + 2z = 3y

⇛x² - 2y + 2z - 3y = 0

⇛x² - 2y - 3y + 2z = 0

⇛x² - 5y + 2z = 0 --------Eqn(1)

Now,

Taking second and third member, we get

⇛ {(-4x - 3z)/5} = y

⇛ {(-4x - 3z)/5} = y/1

On applying cross multiplication then

⇛1(-4x - 3z) = 5(y)

⇛-4x - 3z = 5y

⇛-4x - 5y - 3z = 0 --------Eqn(2)

Now, solving equation (1) and equation (2) using cross multiplication method, we get

⇛{x/(-15 - 10)} = {y/(8 - 3)} = {z/(5 + 20)}

⇛(x/-25) = (y/5) = (z/25)

⇛(x/-5) = (y/1) = (z/5)

⇛(x/5) = (y/-1) = (z/-5)

⇛x = 5k

⇛y = -k

⇛z = -5k

So,

⇛d→ = 5k^ - kj^ - 5kk^

As,

⇛| d→ | = 1

⇛√(25k² + k²+ 25k²) = √(51)

⇛√(26k² + 25k²) = √(51)

⇛51k² = √(51)

⇛k² = 1

⇛k = ±1

Thus,

⇛d→ = ± (5i^ - j^ - 5k^)

Answer: So, required vector is

⇛d→ = 5i^ - j^ - 5k^

and

⇛| d→ | = √(25 + 1 + 25) = √(26 + 25) = √(51)

Please let me know if you have any other questions.

It should be noted that the vectors of magnitude √51 that makes equation angles with the three vectors will be 5i - j - 5k.

From the information given, the following can be depicted:

a = (i^ - 2j^ + 2k^)/3

b = (-4i^ - 3k^)/5

c = j^

After applying cross multiplication, the first equation will be x² - 5y + 2z = 0 and the second equation will be -4x - 5y - 3z.

Solving the equations further will be:

[x/(-15 - 10)] = [(y/(8 - 3)] = [z(5 + 20)]

= (x/-25) = (y/1) = (z/5)

= (x/5) = (y/-1) = (z/-5)

Therefore, x = 5k, y = -k, and z = -5k.

In conclusion, the required vector is 5i - j - 5k.

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During this experiment:

The angle of bob displacement should be small

The simple pendulum a system that moves in an oscillatory motion. It consist of a suspended mass on a string with length placed on a fixed support.

The acceleration due to gravity can be measured using a simple pendulum. During this experiment:

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Hi there!

We can begin by converting rpm to tangential velocity.

1 rotation = 2πR

Convert min to sec: 1 min = 60 sec

[tex]\frac{70rev}{min} * \frac{2(0.56)\pi m} {1rev} * \frac{1 min}{60 s} = \boxed{4.11 \frac{m}{s}}}[/tex]

We can find the tension by using the equation for Centripetal motion.

[tex]T = \frac{mv^2}{r}[/tex]

T = Tension (? N)
m = mass (.3 kg)
v = velocity (4.11 m/s)

r = radius (0.56 m)

Plug in the values:

[tex]T = \frac{.3(4.11^2)}{0.56} \approx \boxed{9.05 N}[/tex]

Answer:

because it can hit another one and git another one

Answer:

The speed each person travels and the distance they travel depends on their mass, friction of the scooter, etc. How would the distance moved by the scooter boards compare if one person had a lot more mass than the other person? The person with less mass would move away faster and would likely move a greater distance.

Answer:

B.), "Focused, warm".

Explanation:

The more focused the rays are, the more energy an area receives, and the warmer it is.

Answer:

B focused and warm.

Explanation:

sounds like a cool place to be

The total work done on the ball by the soccer player is 50,200 J.

The work done by the applied force is the product of the applied of the applied force and the displacement of the object.

The work done on the ball is calculated as follows;

W = Fd

W = 1000 x (0.2 + 50)

W = 50,200 J

Thus, the total work done on the ball by the soccer player is 50,200 J.

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So, the speed of the ball after 2 seconds after free fall is 20 m/s.

Hi ! I'm Deva from Brainly Indonesia. In this material, we can call this event "Free Fall Motion". There are two conditions for free fall motion, namely falling (from top to bottom) and free (without initial velocity). Because the question only asks for the final velocity of the ball, in fact, we may use the formula for the relationship between acceleration and change in velocity and time. In general, this relationship can be expressed in the following equation :

[tex] \boxed{\sf{\bold{a = \frac{v_2 - v_1}{t}}}} [/tex]

With the following conditions :

We know that :

What was asked :

Step by step :

[tex] \sf{a = \frac{v_2 - v_1}{t}} [/tex]

[tex] \sf{(a \times t) + v_1 = v_2} [/tex]

[tex] \sf{(10 \times 2) + 0 = v_2} [/tex]

[tex] \boxed{\sf{v_2 = 20 \: m/s}} [/tex]

So, the speed of the ball after 2 seconds after free fall is 20 m/s.

Answer:

1.19 hours

Explanation:

divide distance by speed. hope this helps

Answer:

if the image is on the book yes , no its can be both

Explanation:

Answer:

1.9

Explanation:

Answer:

a spark

Explanation:

a spark would be the most smartest

Answer:

In a standing sound wave in a pipe, nodes are regions of mean atmosphere pressure and low displacement.

Answer:

B and C are true

Explanation:

A. False, kinetic energy can transfer between particles during a collision.

B. True, one particle could gain kinetic energy, and the other could lose kinetic energy.

C. True

D. False, a fast particle can transfer kinetic energy to a slow particle, or even a particle at rest.

Answer:

1.58901572907

Explanation:

n = 1 / sin(c)

[tex]n=\frac{1}{sin(c)}[/tex]

Answer:

[tex]0\:\mathrm{ m/s^2}[/tex]

Explanation:

Recall the formula for acceleration:

[tex]\displaystyle\\a=\frac{v_f-v_i}{\Delta t}[/tex], where [tex]v_f[/tex] is final velocity, [tex]v_i[/tex] is initial velocity, and [tex]\Delta t[/tex] is elapsed time (change in velocity over this amount of time).

Let's look at our time vs velocity graph. At t=0 seconds, V=25 m/s. So her initial velocity is 25 m/s.

We want to find the acceleration during the first 5 seconds of motion. Well, looking at our graph, at t=5 seconds, isn't our velocity still 25 m/s? Therefore, final velocity is 25 m/s (for this period of 5 seconds).

We are only looking from t=0 seconds to t=5 seconds which is a total period of 5 seconds. Therefore, elapsed time is 5 seconds.

Substituting values in our formula, we have:

[tex]\displaystyle a=\frac{25-25}{5}=\frac{0}{5}=\boxed{0\:\mathrm{m/s^2}}[/tex]

Alternative:

Without even worrying about plugging in numbers, let's think about what acceleration actually is! Acceleration is the change in velocity over a certain period of time. If we are not changing our velocity at all, we aren't accelerating! In the graph, we can see that we have a straight line from t=0 seconds to t=5 seconds, the interval we are worried about. This indicates that our velocity is staying the same! At t=0 seconds, we have a velocity of 25 m/s and that velocity stays the same until t=5 seconds. Even though we are moving, we haven't changed velocity, which means our average acceleration is zero!

The water particles moving perpendicular to the source of the sound wave best describes the direction of the water particles.

These are the types of waves whose oscillations are perpendicular of the wave motion.

A sound wave traveling through water will cause ripples to form which are perpendicular to the source of the sound wave due to it being a transverse wave.

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Julianne’s displacement from her origin is equal to 10.015 kilometers.

Given the following data:

To calculate Julianne’s displacement from her origin:

We would denote the two (2) unit vectors along the East and Northeast directions by i and j respectively.

Note: Northeast is at angle of 45° with the East.

In terms of vectors, the distances becomes:

Distance A = 2i

[tex]Distance\;B=8.5 [(cos 45i + sin 45j)]\\\\Distance\;B=(\frac{8.5}{\sqrt{2} } i \;+\;\frac{8.5}{\sqrt{2} } j)[/tex]

For the resultant displacement:

[tex]D^2 = [(2+\frac{8.5}{\sqrt{2} } )^2+ (\frac{8.5}{\sqrt{2} } )^2\\\\D =\sqrt{[(2+\frac{8.5}{\sqrt{2} } )^2+ (\frac{8.5}{\sqrt{2} } )^2} \\\\D=2+\frac{8.5}{\sqrt{2} } + \frac{8.5}{\sqrt{2} }[/tex]

D = 10.015 kilometers.

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Answer:

The answer is a because its perpendicular

Explanation:

We can conclude that as the mass on the right increases, the distance of the mass towards the right decreases. Also when the two masses balance, the net torque is zero.

The torque experienced by an object a given position is the product of the applied force and the perpendicular distance of the object.

When 5 kg mass is at 2 m on the left, another 5 kg at 2 m on the right will balance it.

[tex]\tau _{net} = (2 \times 5 \times 9.8) - (2 \times 5 \times 9.8)\\\\\tau _{net} = 0[/tex]

Apply principle of moment

[tex]F_1r_1 = F_2r_2\\\\(m_1gr_1) = (m_2gr_2)\\\\r_2 = \frac{m_1gr_1}{m_2g} \\\\r_2 = \frac{m_1 r_1}{m_2} \\\\r _2 = \frac{5 \times 2}{10} \\\\r_2 = 1 \ m[/tex]

[tex]\tau_{et} = m_2gr_2 - m_1gr_1\\\\\tau_{et} = (10 \times 9.8 \times 1) - (5 \times 9.8 \times 2)\\\\\tau_{et} = 0[/tex]

[tex]r_2 = \frac{5 \times 2}{20} \\\\r_2 = 0.5 \ m[/tex]

[tex]\tau_{et} = m_2gr_2 - m_1gr_1\\\\\tau_{et} = (20 \times 9.8 \times 0.5) - (5 \times 9.8 \times 2)\\\\\tau_{et} = 0[/tex]

Thus, we can conclude that as the mass on the right increases, the distance of the mass towards the right decreases. Also when the two masses balance, the net torque is zero.

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Answer:

A. 7.0 milliseconds

Explanation:

We know the formula: Force = [mass( final velocity - initial velocity )] / time

using the formula:

83 = 0.45 (  1.3 - 0 ) / time

time = ( 0.45 * 1.3 )/ 83

time  = 0.585/83

time = 7.0 milliseconds

The time for the mallet in contact with the ball is 7 milliseconds.

To find the time , the given values are,

Mass = 0.45 kg

Force = 83 N

Final velocity = 1.3 m/s, Initial velocity = 0 m/s.

According to Newton's second law of motion, Force is equal to mass that is multiplied by the acceleration.

F = m.a

where, F - Force

m - Mass

a - Acceleration

Here,  Acceleration = ( Final velocity - Initial Velocity) / ( Time )

Acceleration can be defined as the change in velocity with respect to time.

Force = [mass( final velocity - initial velocity )] / time

Substituting the given values in the formula,

83 = 0.45 (  1.3 - 0 ) / Time

Time = ( 0.45 * 1.3 )/ 83

Time  = 0.585/83

Time = 7.0 milliseconds

Hence, Option A is the correct answer.

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#SPJ6

Answer:

Part A: The current is shown in milliamps because the values of current in this circuit are very small.

Part B: The value of the current also increases when the voltage increases.

Part C: The value decreases When the resistance increases.

Explanation: First answer is straight from Edmentum/Plato. B, C are rewritten Hope it helped!

Answer:

Milli means small. It also shows that its small because, such as millimeters. Millimeters are small, so that's why.

Explanation:

This is what i put as my answer!

Hope this helped!

Answer:

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. These types of waves are found globally across the open ocean and along the coast.

Explanation:

A fuse is an electrical safety device which should not blow, which should overheat and melts if current is too high. Its placed in the live wire before the switch. This prevents overheating and catching fire. A fuse have a specific current value for example - 3000 amps. So when choosing a suitable fuse you must use the above minimum value but less than maximum value. For example in a circuit there is 1000W flowing, you should choose more than 1000 amps fuse not less or else, it will melt.

Hi there!

We can use the following kinematic equation:

[tex]v_f^2 = v_i^2 + 2ad[/tex]

vi = initial velocity (6.7 m/s)
vf = final velocity (0 m/s at top of trajectory)

a = acceleration due to gravity (-9.8 m/s²)

d = max height reached (? m)

We can plug in the knowns:

[tex]0 = 6.7^2 + 2(-9.8)(d)\\\\[/tex]

Solve for 'd':

[tex]d = \frac{6.7^2}{2(9.8)} = \boxed{2.29 m}[/tex]

We will find that his average velocity is 1.11 m/s north-wise.

We define average velocity as the quotient between the displacement and the time it takes to make that displacement.

We know that he starts at the point 0m, where this measures distance in the north direction.

Then he moves 1000 meters north, so the new position is 1000m.

Then he moves 200 meters south, so the new position is:

1000m - 200m = 800m.

The displacement is equal to the difference between the final position (800m) and the initial position (0m).

D = 800m - 0m = 800m.

And we know that it takes 12 minutes to walk that distance. Because we want the average velocity in meters per second, we write:

12 minutes = 12*(60 seconds) = 720s

Then the average velocity is just:

AV = (800m)/(720s) = 1.11 m/s

And the direction of this average velocity is north-wise.

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