If a 50 N block experiences a force of kinetic friction of 11 N
from the surface of a table, then what is the coefficient of
kinetic friction () between the block and the table?

Answer:

D lithosphere colliding

Reason:

Image result for what causes the formation of trenches in Earth’s crust

Trenches are formed by subduction, a geophysical process in which two or more of Earth's tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.

The formation of trenches in Earth's crust is caused by the collision of lithospheric plates, so the correct answer is "lithosphere colliding."

Trenches are long, narrow depressions or canyons in the Earth's crust that form at subduction zones, where one lithospheric plate is forced beneath another plate into the Earth's mantle. Trenches are primarily found on the ocean floor, where they can be several kilometers deep and hundreds of kilometers long.

Trenches are formed by the process of subduction, which occurs when one tectonic plate moves beneath another plate. As the denser plate sinks into the mantle, it creates a deep trench in the ocean floor. This process is associated with volcanic activity, as the sinking plate often triggers the melting of rock in the mantle, which can then rise to the surface and form volcanic islands or arcs.

Trenches are important features of the Earth's crust because they provide evidence for the movement and interaction of tectonic plates over time. Additionally, they are often associated with earthquakes and can serve as warning signs of potential seismic hazards in the surrounding region.

Therefore, lithosphere colliding causes the formation of trenches in Earth’s crust.

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Answer:

No!

Explanation:

The sliver of California west of the San Andreas fault is slowly moving northwestward with the Pacific plate; movement is essentially horizontal.

The effect of black papper on the field is that the black paper have a form of chimney effect. Thid is because the black paper heat up the space between the field and the body in order to allow an upward air current like a chimney. This air current adds to the cooling of the field.

Black paper absorb heat from the surrounding and generate it to current flow in the field.

A field refer to a egion in which each point has a physical quantity like time or gravitational or space which are connected and associated with the region.

Therefore, the black paper allow air current flow.

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Regular exercise and physical activity is responsible for strong muscles and bones.

Exercise and physical activity improves respiratory, cardiovascular, and overall health of an individual. Staying active can help in maintaining a healthy weight, reduce your risk of diabetes, heart disease, and reduce risk for cancers so we can conclude that regular exercise and physical activity is responsible for strong muscles and bones.

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Answer: Kinetic energy is the energy of mass in motion. Because kinetic energy is proportional to the velocity squared, increases in velocity will have an exponentially greater effect on translational kinetic energy.

Explanation: Google

A moving object's kinetic energy is directly proportional to both its mass and the square of its velocity.

How does kinetic energy gets changed ?

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Answer:

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

Explanation:

sorry if this is wrong or is incorrect... but at least I tried right.

Answer:D>D>D>D>D>D>D>D>>D>D>D>D>D>D>D>D>D>

Explanation:

Answer:

O D. Any fundamental force

Explanation:

got it right on the test

Answer:

Option A. I and then II or III

Explanation:

From the question given above, the following data were obtained:

Angle = θ

Opposite = 16 m/s

Adjacent = 24 m/s

Hypothenus = v

i. The value of θ can be obtained by using Tan ratio as show below:

Tan θ = Opposite / Adjacent

Opposite = 16 m/s

Adjacent = 24 m/s

Tan θ = 16 / 24

ii. Cos θ = Adjacent /Hypothenus

Adjacent = 24 m/s

Hypothenus = v

Cos θ = 24 / v

Cross multiply

v × Cos θ = 24

Divide both side by Cos θ

v = 24 / Cos θ

iii. Sine θ = Opposite /Hypothenus

Opposite = 16 m/s

Hypothenus = v

Sine θ = 16 / v

Cross multiply

v × Sine θ = 16

Divide both side by Sine θ

v = 16 / Sine θ

From the above illustrations, we can use (i) to obtain θ then we can use (ii) or (iii) to obtain the value of v.

Answer:

Explanation:

To solve this problem we need to know the direction in which the ball was moving to start with.

The answer will be different depending n the original angle of the ball's movement.

It might be reasonable to assume that the ball is meant to approach along the x-axis,

but if so, the initial speed of 6.42m/s would be irrelevant to the answer.

So I will solve the problem for the general case of two objects colliding at arbitrary angles, and

tell you how to specialize it for any assumption about the initial conditions.

Let

m1 = 7.5 kg be the mass of the ball,

m2 = 1.6 kg be the mass of the pin,

v1 = 6.42 m/s be the velocity of the ball before the strike,

v2 = 0 m/s be the velocity of the pin before the strike,

α1 be the angle of v1,

α2 be the angle of v2,

w1 be the velocity of the ball after the strike,

w2 = 14.8 m/s be the velocity of the pin after the strike,

β1 be the angle of w1,

β2 = -47° be the angle of w2.

By conservation of momentum:

m1v1 + m2v2 = m1w1 + m2w2

Since the velocities are vectors, the addition is vector addition, and the equality is vector equality.

"Vector equality" means that the x-coordinates are equal and the y-coordinates are equal.

The problem cares only about y-coordinates, specifically the y-coordinate of w1, which is w1sin(β1).

(In general, the y-coordinate of any vector is obtained by multiplying the vector's norm by the sine of its angle.)

Conservation of momentum in the y-coordinate is then

m1v1sin(α1) + m2v2sin(α2) = m1w1sin(β1) + m2w2sin(β2)

Expressing the sought quantity

w1sin(β1) = (m1v1sin(α1) + m2v2sin(α2) - m2w2sin(β2))/m1

Substituting known quantities:

w1sin(β1) = (7.5×6.42×sin(α1) + 1.6×0×sin(α2) - 1.6×14.8×sin(-47°))/7.5

= (48.15×sin(α1) + 17.3)/7.5

In the above expression we do not know α1.

If we assume that the ball is approaching along the x-axis then α1 = 0, and

w1sin(β1) = 17.3/7.5 = 2.3

Under that assumption the y-component of the ball's final velocity is 2.3 m/s;

being positive, it is opposite the direction of the pin.

Answer:

Largest; options A & B

2nd largest; Option F

3rd Largest; Option D

Smallest; Options E & C

Explanation:

Looking at the charges, basically, the net force of the charge q1 is the sum of charges q2 and q3.

When 2 charges are opposite, the force will be attractive but if they are same, then the force will be repulsive.

Thus, the order of the forces is;

I) Largest: q1= +1nC, q2= -1nc, q3= -1nc and (q1= -1nC, q2= +1nc, q3= +1nc)

II) Second largest is: q1= +1nC, q2= -1nc, q3= +1nc

III) Third largest: q1= +1nC, q2= +1nc, q3= -1nc

IV) Smallest: (q1= -1nC, q2= -1nc, q3= -1nc) and (q1= +1nC, q2= +1nc, q3= +1nc)

Answer:

Gravity,momentum & friction are examples of FORCE.

Explanation:

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Answer:

The answer is

Explanation:

The momentum of an object can be found by using the formula

From the question

m = 1400 kg

v = 40 m/s

We have

momentum = 1400 × 40

We have the final answer as

Hope this helps you

If Maribel sends current through the copper wire in the iron rod, the needle of the compass will point toward the device.

Electric current is the rate of flow of electric charge.

According to this question, Maribel has an iron rod around which she wraps copper wire. She places the device on a table near a compass.

If Maribel sends current through the copper wire in the iron rod, the needle of the compass will point toward the device because the metallic needle is attracted in the direction of the current.

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Answer:

a. Muscular endurance

is correct answer

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Answer:

t = 5 s

Explanation:

We'll need this equation:

Vf = Vi + at

Rearranging the equation to solve for time, we get:

t = ( Vf - Vi ) / a

Plugging in what we know, we get:

t = ( 50 m/s - 0 m/s ) / 10 m/s^2

t = 5 s

Meat-eating desert reptiles depend on small animals in their habitat on which they feed.

Meat-eating desert reptiles depend on small animals that lives to their surrounding. On these animals, these meat eating desert reptiles feed and fulfill their requirements of food so we can conclude that meat eating reptiles needs small animals present in the desert for feeding.

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Answer: Green!

Explanation: ThankYou bro

Answer:

It is 5F

Explanation:

Answer:

304.87 m/s

Explanation:

v2 = v1 × √T2÷√T2

v2 = 330 × √233÷√273

v2 = 304.87 m/s

Answer:

Choice a. Approximately [tex]0.83\; \rm A[/tex] on average.

Explanation:

The electric current through a wire is the rate at which electric charge flows through a cross-section of this wire.

Assume that electric charge of size [tex]Q[/tex] flowed through a wire cross-section over a period of time [tex]t[/tex]. The average current in that wire would be:

[tex]\displaystyle I = \frac{Q}{t}[/tex].

For this question:

Therefore, the average current in this circuit would be:

[tex]\displaystyle I = \frac{Q}{t} = \frac{500\; \rm C}{10\; \text{minutes}} = 50\; \rm C /\text{minute}[/tex].

However, the units in the choices are all in [tex]\rm A[/tex] (for Amperes.) One Ampere is equal to one [tex]\rm C / \text{second}[/tex]. It will take some unit conversations to change the unit of [tex]I = 50\; \rm C/ \text{minute}[/tex] (coulombs-per-minute) to coulombs-per-second.

[tex]\begin{aligned}I &= 50\; \rm C/ \text{minute} \\ &= \frac{50\; \rm C}{1\; \rm \text{minute}} \times \frac{1 \; \text{minute}}{60\; \rm \text{seconds}} \approx 0.83\; \rm C/ \text{second} = 0.83 \; \rm A\end{aligned}[/tex].

Hence, the most accurate choice here would be choice a.

The relativistic momentum of the rocket differ from the ordinary momentum by a factor of 1.2m.

The relativistic momentum of the rocket is calculated as follows;

[tex]P = \frac{mv}{\sqrt{1- \frac{v^2}{c^2} } } \\\\P = \frac{m(12010)}{\sqrt{1- \frac{(12010)^2}{(3\times 10^8)^2} } } \\\\P = 12,011.2 m \ (kgm/s)[/tex]

where;

The ordinary momentum of the rock is calculated from the product of mass and velocity of the rocket.

P = mv

P = 12010m (kgm/s)

ΔP = 12,011.2m - 12,010m

ΔP =  1.2m

Thus, the relativistic momentum of the rocket differ from the ordinary momentum by a factor of 1.2m.

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The process of transcription and translation forms part of the central dogma of molecular biology which describes protein synthesis from genes.

Transcription is the process whereby RNA molecules are synthesized from DNA.

The RNA produced is messenger RNA written as mRNA

The mRNA produced is used then used to synthesize proteins at the ribosomes in a process known as translation.

Amino acids which are used to make the proteins are code for by three nucleotides known as codons.

Therefore, the process of transcription and translation is used for protein synthesis from genes.

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Answer:

Parallelogram law of vector addition states that. if two vectors are considered to be the adjacent sides of a parallelogram, then the resultant of the two vectors is given by the vector that is diagonal passing through the point of contact of two vectors.

Answer:

(i) 12 seconds

(ii) 216 meters from the initial position

(iii) 132 meters from the initial position

(iv) No

Explanation:

Speed of express train =36 m/s

Speed of local train =11 m/s

The initial distance between the local train and passenger train =100 m.

Due to the application of breaks, the express train slows at the rare of [tex]3.0 m/s^2.[/tex]

So, the acceleration of the express train, [tex]a=-3 m/s^2[/tex].

(i) Let t be the time the express train takes to stop.

From the equation of motion,

v=u+at

where, v: final velocity, u: initial velocity, a: constant acceleration, t: time taken to change the speed from u to v.

In this case, v=0, u=36 m/s, [tex]a=-3 m/s^2[/tex]

So, 0=36+(-3)t

[tex]\Rightarrow t= 36/3=12[/tex] seconds.

(ii) To compute the distance traveled, s, till the express train stops, using

[tex]v^2=u^2+2as[/tex]

[tex]\Rightarrow 0^2=36^2+2(-3)s[/tex]

[tex]\Rightarrow s=\frac{36\times36}{6}[/tex]

[tex]\Rightarrow s=216[/tex] meters.

(iii) The local train is moving at a speed of 11 m/s

So, in 12 seconds, the distance, d, traveled by the local train

d= 11x12=132 meters [as distance= speed x time]

(iv) Let 0 be the reference position which is the initial position of the express train.

So, at the initial time, the position of the local train is at 100m.

After 12 seconds:

The position of the express train is at 216 m [using part (ii)]

and the position of the local train is at 100+132=232m  [using part (iii)].

So, the local train is still ahead of the express train, hence the trains didn't collide.

Answer:

392 j

Explanation:

potential energy (PE) is equal to the mass of the object multiplied by the acceleration due to gravity multiplied by the height of the object.

PE=mgh (g=9.8 m/s/s)

PE= (2 kg)(9.8 m/s/s)(20 m)

PE= 392 j

j= joules

Answer:

30

Explanation:

Plug in p to get 4(8) - 2

32 - 2 = 30

Answer:

540 newtons.The weight of the chair is 90 N. Action-reaction pairs include the cat-woman’s lap, the woman- chair, the chair-strongman, and the strongman-ground.

Explanation:

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Answer:

As per Provided Information

Distance travelled by motorcycle is 420 miles

Time taken by motorcycle is 8.5 hours

we have been asked to determine the average speed of the motorcycle .

[tex] \bf \: Speed_{(Average)} = \cfrac{total \: distance \: travelled}{time \: taken} [/tex]

Now let's put the given value to find the average speed of motorcycle

[tex] \longrightarrow \sf \: Speed_{(Average)} \: = \cfrac{420}{8.5} \\ \\ \\ \longrightarrow \sf \: Speed_{(Average)} \: = \cfrac{4200}{85} \\ \\ \\ \longrightarrow \sf \: Speed_{(Average)} \: = \cancel\cfrac{4200}{85} \\ \\ \\ \longrightarrow \sf \: Speed_{(Average)} \: = 49.41 \: miles \: per \: hour[/tex]

Therefore,