A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground. Calculate the velocity of the acorn just before it reaches the ground (rounding your answer to the integer) and its kinetic energy when hitting the ground (rounding your answer to the nearest tenth)

Answer:

1.7 m

Explanation:

[tex]v_x[/tex] = Velocity of ball in x direction = 4.47 m/s

[tex]u_y[/tex] = Velocity of ball in y direction = 0

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

t = Time taken

[tex]s_y[/tex] = Vertical displacement = 0.7 m

[tex]s_y=u_yt+\dfrac{1}{2}gt^2\\\Rightarrow 0.7=0+\dfrac{1}{2}\times 9.81t^2\\\Rightarrow t=\sqrt{\dfrac{0.7\times 2}{9.81}}\\\Rightarrow t=0.38\ \text{s}[/tex]

Horizontal displacement is given by

[tex]s_x=v_xt\\\Rightarrow s_x=4.47\times 0.38\\\Rightarrow s_x=1.7\ \text{m}[/tex]

The passenger should throw the ball 1.7 m in front of the bucket.

Answer:

I am pretty sure it is B My friend hope you are well

Explanation:

Answer:

B- It is a constant when the light is traveling in a vacuum.

Explanation:

"Light in a vacuum always travels at the same speed." Those additional three words in a vacuum are very important. A vacuum is a region with no matter in it. So a vacuum would not contain any dust particles (unlike a vacuum cleaner, which is generally full of dust particles)

Answer:

false here is why :)

Explanation:

Regular, moderate-intensity physical activity reduces the risk of developing coronary heart disease and can reduce the likelihood of dying from heart disease.

hope this helped.

Answer:  10 m/s

We're told the speed is constant, so it's not changing throughout the time period given to us. So throughout the entire interval, the speed is 10 m/s.

Answer:

(C) Solar radiation

Explanation:

The water cycle is driven by solar energy that produces solar radiation and this drives water from ocean surface , rivers, lakes, soil and plants through transpiration , which then forms clouds and water falls back on earth as precipitation.  

Answer:

c i took the test

Explanation:

Answer:

The final speed is 75 m/s

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes uniformly in time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at[/tex]

The airplane comes from rest (vo=0) accelerating at a=25 m/s^2 for t=3 s.

The final speed is:

[tex]v_f=0+25~m/s^2\cdot 3~s[/tex]

[tex]v_f=75~m/s[/tex]

The final speed is 75 m/s

Answer:

the correct answer is A

Explanation:

In a series circuit the current flows through the circuit and when it is opened at some point the current stops throughout the circuit.

In a parallel circuit, the current flows through the different branches of the circuit and when the current in one branch is interrupted, it continues to flow through the others.

In this exercises they indicate that the bedroom lights are turned off (the circuit was opened), but the kitchen lights are still on, therefore it is a parallel circuit with at least two branches, the current that circulates through each one depends on the existence on each branch.

Therefore the correct answer is A

Answer:

A real image.

Explanation:

A real image is formed by real interaction of rays, hence it is possible to project it on a screen. And where a virtual image is drawn via back tracing the path of reflected rays, hence they don't meet in reality.

Explanation:

Inertia is the tendency of a body to remain at rest or to do nothing.

It is the resistance to any change in position of body.

 When the force on a body increases, the inertia reduces

 When the mass is reduced the inertia reduces

According to newton's first law or the law of inertia "an object will remain in its state of rest or of uniform motion unless if it is acted upon by an external force".

Answer:

Long short

Explanation:

1

Dogs that are bigger are selected to be parents.

2

The parents are bred together, and their offspring will be different sizes.

3

The biggest offspring will be selected and bred together.

4

This cycle continues until the dogs have been selectively bred to be bigger than the current world record size.

5

Selective breeders need to ensure that they are not also selecting for disadvantageous traits, like genetic limb defects.

Ur gonna need this...

Brainliest plzzz..thanks..sorry Messy

Answer:

Geological and atmospheric changes happening over a long time scale can cause short extinctions.

Explanation:

Answer:

 fr ’= ½ F

Explanation:

For this exercise we use the translational equilibrium equation, on the axis parallel to the wall

              fr - W = 0

              fr = W

for the adult man they indicate that the friction force is equal to F

              F = M g

we write the equilibrium equation for the child

             fr ’= w’

             fr ’= m g

in the statement they tell us that the mass of the adult is 2 times the mass of the child

             M = 2m

we substitute

            fr ’= M / 2 g

            fr ’= ½ Mg

we substitute

            fr ’= ½ F

therefore the force of friction in the child is half of the friction in the adult

Answer:

a. same

b. less

c. less

Explanation:

you can use the position, time, acceleration equation

xf=xi + vi*t+(at^2)/2

you can say the final distance will greater for X than Y

using acceleration for gravity a=9.81m/s^2

a.  both X and Y will have the same acceleration due to gravity

b. to solve for final speed vf=vi+gt

since the initial velocity is 0 and X will take longer to fall, Y will hit the ground with less speed

c. as mentioned before, X will take longer to fall; therefore Y will have less time of descent.

Answer:

2.625 m/s

Explanation:

This is a momentum question. Momentum is conserved which means that all the starting momentum must be accounted for.

1.5 kg * 2 m/s + 2.5 kg * 3 m's = (1.5 + 2.5)kg * x m/s

3 kg m/s + 7.5 kg m/s = 4 kg * x

10.5 kg m/s = 4 kg x

10.5 / 4 = x

x = 2.625 m/s

inelastic means that after the collision, the masses stick together as though they were one.

Answer:

Hydrogen and helium

Answer:

1. iron, nickel, calcium, sodium, and magnesium

2. nuclear fusion

Explanation:

I googled it

Answer:

-6.25 m/s

Explanation:

i took the quiz

Answer:

Ammeter

Explanation:

An ammeter is used to measure current.

Answer:

the answer is c. hope this help you out

Answer:

incorrect, the mantle is solid

Explanation:

Complete Question

While john is traveling along a straight in interstate highway, he notices that the mile marker reads 242 km. John travels until he reaches the 147 km marker and then retraces his path to the 161 km marker. What is John's resultant displacement from the 242 km marker? How far has he traveled answer in units of km

Answer:

The resultant displacement [tex]\Delta x _{1 , 3} = 81 \ km[/tex]

The total distance traveled by john is  [tex]x_t =109 \ km[/tex]

Explanation:

From the question we are told that

      The first position of john from the finish point   is [tex]x_1 = 242 \ km[/tex]

       The second position of john from the finish point is   [tex]x_2 = 147 \ km[/tex]

        The third position of john from the finish point is [tex]x_3 = 161 \ km[/tex]

Generally the displacement from the 242 km  marker is mathematically represented as

          [tex]\Delta x _{1 , 3} = x_1 - x_3[/tex]

Here we used [tex]x_3[/tex] instead of  [tex]x_2[/tex] because [tex]x_3[/tex] is further than [tex]x_2[/tex] from the finish point

=>       [tex]\Delta x _{1 , 3} = 81 \ km[/tex]

Generally the total distance traveled by John is  mathematically evaluated as

         [tex]x_t = [x_1 - x_2 ] + [x_3 - x_2][/tex]

=>       [tex]x_t = [242 - 147 ] + [161 - 147][/tex]

=>       [tex]x_t =109 \ km[/tex]

Answer  888990,0 kg

Explanation:

888990,0 kg is the mass of the object.

Any two mass-containing objects are attracted to one another by the gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive.

Newton's Universal Law of Gravitation is what it is known as.

Admittedly, you aren't pushing on those other objects all that much because you don't have a very large mass. Additionally, items that are very far apart from one another do not clearly tug on one another. 

Therefore, 888990,0 kg is the mass of the object.

To learn more about Gravitational constant, refer to the link:

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Answer:

-47.04

Explanation:

Divide 12 m by 2.5 m/s which equals 4.8s

And then use 4.8s to multiply it with -9.8

4.8(-9.8)= -47.04 m/s

Hope this helped!! :)

The initial height of the pumpkin is 23.52m and the final vertical velocity of the pumpkin is 47.04 m/s.

Initial horizontal speed, u = 2.5 m/s

horizontal distance covered , d = 12m

So the time taken is:

t = d/u

t = 12/2.5 s

t = 4.8s

Now, the initial vertical speed, v = 0

So the vertical distance traveled by the pumpkin will be equal to the initial height of the pumpkin:

s = vt + ¹/₂gt²

s = 0.5 × 9.8 × 4.8 m

s = 23.52m

Final vertical velocity:

v' = v + gt

v' = 9.8 × 4.8 m/s

v' = 47.04 m/s

Learn more about laws of motion:

https://brainly.com/question/26083484?referrer=searchResults

Answer:

0.5m/s²

Explanation:

Given parameters:

Initial velocity  = 0m/s

Final velocity  = 5m/s

Time taken  = 10s

Unknown:

Acceleration of the bicycle  = ?

Solution:

Acceleration is the rate of change of velocity with time.

   Acceleration  = [tex]\frac{v - u}{t}[/tex]  

v is the final velocity

u is the initial velocity

t is the time taken

  Insert the parameters and solve;

     Acceleration = [tex]\frac{5-0}{10}[/tex]   = 0.5m/s²

Answer:

Force of kinetic friction, Fk = 6N

Explanation:

Given the following data;

Coefficient of kinetic friction, μ = 0.2

Normal force, Fn=30N

To find the Force of kinetic friction;

Mathematically, the force of kinetic friction is given by the formula;

Fk = μFn

Where;

Substituting into the equation, we have;

Fk = 0.2*30

Fk = 6N

Therefore, the force of kinetic friction is 6N.

A force that is present between two moving objects or surfaces is called kinetic friction. It is estimated in newtons (N) and is calculated by:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

Where, [tex]\rm F_{k}[/tex] = frictional force,  [tex]\mu _{\rm k}[/tex]  = coefficient, [tex]\rm F_{n}[/tex] = normal force.

The kinetic friction of the object is 6N.

The kinetic friction can be estimated as:

Given,

Substituting values in the formula:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

[tex]\begin{aligned}\rm F_{k} &= 0.2 \times 30\\\\\rm F_{k} &= 6 \rm N\end{aligned}[/tex]

Therefore, 6N is the frictional force.

To learn more about frictional force follow the link:

https://brainly.com/question/1714663

My commute to school is a constant distance, but the time it takes to get there fluctuates owing to traffic.

If an object moves with respect to a reference frame, such as when a passenger travels to the back of an airliner or a professor moves to the right with respect to a whiteboard, the item's position changes.

This change in location is described as displacement.

My commute to school is a constant distance, but the time it takes to get there fluctuates owing to traffic,

The initial and the final position of the commute is the same, but the displacement varies with the route which affects my car's speed and where it is in line at stop lights.

Learn more about displacement here, refer to the link;

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Answer:

Food chain is a linear transfer of energy from the producer to the consumer

producer →primary consumer → secondary consumer → tertiary consumer while food web is the interconnection of two or more food chains

Answer:

i think 53 or 56

Explanation:

cause i cross multiplied and got that

Answer :

He had 300 more nickels than dimes in the end

Explanation:

The ratio of dimes and nickels has changed to 6:21; we have known this son that is 540 dimes and nickels together the. We can make a proportion difference/sum=15/27= difference/540. By cross multiplying, difference=15 x 540  divided by  27= 300

Which gives us the answer that he had 300 mor nickels than dimes in the end.