need help please... thank u​

If i understand your question clearly, The best choice in most scenarios is  copper.

Why?

Its due to copper's high conductive properties, its abundance, its low price compared to its fellow metal conductors, its ductile property, thermal resistance and immunity to oxidation ( rusting ).

Though Silver surpasses copper in conductivity, copper is shown to be more notable than its fellow conductors.

Answer:

Explanation:

Let's analyze the situation presented in order to know which answer is correct.

When the stick collides with the puck, it exerts a force for a certain time and discants. / After this time the horizontal force decreases to zero and the disk continues to move by the action of the initial velocity on the x axis and the acceleration of gravity on the y axis.

Therefore, after the collision, the only force that acts on the disk is the gravitational attractive force (WEIGHT), directed on the axis and in a negative direction.

The correct answer is:

C)           Since there is no frictional force exerted on the puck, a normal force is not exerted on the puck, but the gravitational force is exerted on the puck

Answer:

d.Net force

Explanation:

The net force is the force which is the sum of all the forces acting on an object simultaneously.

Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum. Class 3 has the effort between the load and the fulcrum.

...

Examples

Tweezers.

Stapler.

Mousetrap.

Broom.

Hockey stick.

Answer:

Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the same acceleration as all those actual forces together as described by Newton's second law of motion.

Explanation:

use this, but put it into you own words.

Answer:

The vector sum of forces acting on a particle or body is referred to as net force. The net force is a single force that replaces the effect of the original forces on the motion of the particle. It provides the particle with the same acceleration as all of the actual forces combined, as described by Newton's second law of motion.

°•°•°•°•°•°•°•°•°•°•°•°•°•°•°•°•

Hope it helps

Have a great day!!

Answer:

protects the surface from meteoroids and comets

Explanation:

Have a nice day

protects the surface from meteoroids and comets

Answer:

it would melt with the hot weather

Explanation:

It melts and the water changes color

Answer:

d

Explanation:

Answer:

B

Explanation:

Answer:

Length of the wire in meters​ = 0.000628 meter (Approx.)

Explanation:

Given:

Diameter of wire = 0.2 mm

Find:

Length of the wire in meters​

Computation:

Radius of wire = 0.2 / 2

Radius of wire = 0.1

Length of the wire = Circumference of circle

Circumference of circle = 2πr

Length of the wire = 2πr

Length of the wire = 2(3.14)(0.1)

Length of the wire = 0.628 mm (Approx.)

1 meter = 1,000 mm

So,

Length of the wire in meters​ = 0.000628 meter (Approx.)

Answer:

The speed of the object at the lowest point in its trajectory is:

[tex]v=2.34\: m/s[/tex]

Explanation:

We can use the conservation of energy between the maximum point of swing and the lowest point of the pendulum.

[tex]P=K[/tex]

[tex]mgh=\frac{1}{2}mv^{2}[/tex] (1)

Where:

We can find h using trigonometry.

[tex]h=L-Lcos(30)=L(1-cos(30))[/tex]

[tex]h=2.1(1-cos(30))=0.28\: m[/tex]

Now, using equation (1) we can find v.

[tex]gh=\frac{1}{2}v^{2}[/tex]

[tex]2gh=v^{2}[/tex]

[tex]v=\sqrt{2gh}[/tex]

[tex]v=\sqrt{2(9.81)(0.28)}[/tex]

[tex]v=2.34\: m/s[/tex]

I hope it helps you!

Answer:

Option (D), lunar eclipse

Explanation:

When the moon comes between the earth and sun, the lunar eclipse occurs, so D is the lunar eclipse. It is full moon day.

C is the position when there is new moon day and it is solar eclipse.

So, option (D) is correct.

The process of filtration of swamp water using a filtering material such as neat clothes will make the water clearer and remove any bad smell.

Filtration is a separation technique used to separate insoluble solids from a liquid.

Filtration is employed in water purification.

Water purification is done in water purification plants.

A locally designed purification process for swamp water will involve using materials such as:

The T-shirt is used filter out mud and sediments.

Repeated filtrations will make the water clearer and remove any bad smell.

Learn more about filtration at: https://brainly.com/question/552187

Answer: Step down

Explanation:

Given

No of turns on the primary coil is [tex]N_p=8000[/tex]

No of turns on the secondary coil is [tex]N_s=200[/tex]

Primary is connected to the voltage [tex]V_p=240\ V[/tex]

According to the turns rule

[tex]\Rightarrow \dfrac{N_p}{N_s}=\dfrac{V_p}{V_s}\\\\\Rightarrow \dfrac{8000}{200}=\dfrac{240}{V_s}\\\\\Rightarrow V_s=\dfrac{240}{40}\\\\\Rightarrow V_s=6\ V[/tex]

As the voltage drops from 240 V to 6 V. Therefore it is a step-down transformer.

Answer:

According to the principle of the Conservation of Energy, energy can neither be destroyed or created, energy can be transformed from form to another

The forms of energy the car has at the different stages is given by virtue of either the position of the car, which is the car's potential energy, or the speed of the car, which gives the potential energy of the car

However, due to the frictional forces acting on the car, there is a frictional force which requires work to be done for the car to move between points in the roller coaster

Therefore, based on the Conservation of Energy principle, we have;

The total energy of the roller coaster, M.E. = m·g·[tex]h_{max}[/tex]

Where;

m = The mass of the roller coaster = 4,500 kg

g = The acceleration due to gravity ≈ 9.81 m/s²

[tex]h_{max}[/tex] = The maximum height = 30 m

Therefore, M.E.[tex]_A[/tex] = 4,500 × 9.81 × 30 = 1,324,350 J

The energy at point B, [tex]M.E._B[/tex] = 4,500×15×9.81 + (1/2) ×4,500×17.15² = 1,323,950.625

The energy at point B, [tex]M.E._B[/tex] = 1,323,950.625 J

At point C, the total energy, [tex]M.E._C[/tex] = (1/2)·m·v²

Where;

v = The velocity of the roller coaster at point c = 24.25 m/s

Therefore;

[tex]M.E._C[/tex] = (1/2) × 4,500 × 24.25² = 1,323,140.625

At point C, the total energy, [tex]M.E._C[/tex] = 1,323,140.625 J

Therefore, given that the energy at point A, M.E.[tex]_A[/tex] is larger than the energy at point B, [tex]M.E._B[/tex], is larger than the energy at point C, [tex]M.E._C[/tex], the loss in energy can be explained by the presence of the friction which require energy for movement of the roller coaster between the points

Explanation:

Answer:

i. 2.5 kHz ii. 5 kHz

Explanation:

The frequency of the wave in the rod is given by f = nv/2L where n = harmonic, v = speed of sound in rod = 5000 m/s and L = length of rod = 1 m

i. f1

For f1, n = 1

f1 = 1 × v/2L

= v/2L

Substituting the values of the variables into the equation, we have

= 5000 m/s ÷ (2 × 1 m)

= 5000 m/s ÷ 2 m

= 2500 /s

= 2500 Hz

= 2.5 kHz

ii. f2

For f2, n = 2

f2 = 2 × v/2L

= v/L

Substituting the values of the variables into the equation, we have

= 5000 m/s ÷ 1 m  

= 5000 /s

= 5000 Hz

= 5 kHz

Energy released ,

[tex] = 3.789 \times {10}^{ - 12} [/tex] J

Answer:

Explanation:

Considering the fact that we ave been given an angle of inclination here, we best use it! That means that the velocity of 23 m/s is actually NOT the velocity we need; I tell my students that it is a "blanket" velocity but is not accurate in either the x or the y dimension of parabolic motion. In order to find the actual velocity in the dimension in which we are working, which is the y-dimension, we use the formula:

[tex]v_{0y}=v_0sin\theta[/tex] and filling in:

[tex]v_{0y}=23sin(25)[/tex] which gives us an upwards velocity of 9.7 m/s. So here's what we have to work with in its entirety:

[tex]v_{0y}=9.7m/s[/tex]

a = -9.8 m/s/s

t = 2.8 seconds

Δx = ?? m

The one-dimensional motion equation that utilizes all of these variables is

Δx = [tex]v_0t+\frac{1}{2}at^2[/tex] and filling in:

Δx = [tex]9.7(2.8)+\frac{1}{2}(-9.8)(2.8)^2[/tex] I am going to do the math according to the correct rules of significant digits, so to the left of the + sign and to 2 sig fig, we have

Δx = 27 + [tex]\frac{1}{2}(-9.8)(2.8)^2[/tex] and then to the right of the + sign and to 2 significant digits we have

Δx = 27 - 38 so

Δx = -11 meters. Now, we all know that distance is not a negative value, but what this negative number tells us is that the ball fell 11 meters BELOW the point from which it was kicked, which is the same thing as being kicked from a building that is 11 meters high.

Answer:

Which best describes the electric field created by a positive charge? ... Its rays point toward the charge.

Explanation:

thank me later

Answer:

pretty sure its studying the atomic structure of a solid carbon dioxide. so c

Explanation:

Answer:

B. Studying the atomic structure of solid carbon dioxide

Explanation:

This is known as crystallography, the study of the arrangement of atoms in a solid, and it is a popular branch of solid-state physics.

Hope this helps :)

Answer:

5 m

Explanation:

We'll begin by calculating the original potential energy. This can be obtained as follow:

Mass (m) = 0.2 Kg

Height (h) = 20 m

Acceleration due to gravity (g) = 10 m/s²

Energy (E₀) =?

E₀ = mgh

E₀ = 0.2 × 10 × 20

E₀ = 40 J

Next, we shall determine the new energy of the ball.

Energy (E₀) = 40 J

Energy lost (Eₗ) = 30 J

New energy (E) =?

E = E₀ – Eₗ

E = 40 – 30

E = 10 J

Finally, we shall determine height of the ball on rebound. This can be obtained as follow:

New energy (E) = 10 J

Mass (m) = 0.2 Kg

Acceleration due to gravity (g) = 10 m/s²

Height (h) =?

E = mgh

10 = 0.2 × 10 × h

10 = 2 × h

Divide both side by 2

h= 10 / 2

h = 5 m

Thus, the height of the ball on rebound is 5 m

Answer:

La persona pesa menos

Explanation:

Generalmente, definimos el peso como la fuerza gravitacional que actúa sobre un objeto.

Dado que la constante gravitacional depende del cuadrado de la distancia medida desde el centro de la Tierra, podemos concluir que el peso de un objeto disminuye a medida que aumenta la distancia entre el objeto y el centro de la Tierra (mayor altitud).

Por lo tanto, la persona que pesa 700 N al nivel del mar pesará menos cuando esté en un avión a una altitud de 10,000 m.

Answer:

Many digital consumer products in everyday life such as mobile phones / smartphones, digital cameras, televisions, washing machines, refrigerators and LED bulbs also use semiconductors.

multiplication of two vectors yields a vector oroduy

Answer:

a) The uniform velocity travelled by the car is 10 meters per second.

(Point b has been erased by the user)

c) The distance travelled by the car with uniform velocity is 100 meters.

Explanation:

a) Calculate the uniform velocity travelled by the car:

The uniform velocity is the final velocity ([tex]v[/tex]), in meters per second, of the the uniform accelerated stage:

[tex]v = v_{o} + a\cdot t[/tex] (1)

Where:

[tex]v_{o}[/tex] - Initial velocity, in meters per second.

[tex]a[/tex] - Acceleration, in meters per square second.

[tex]t[/tex] - Time, in seconds.

If we know that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]a = 2\,\frac{m}{s^{2}}[/tex] and [tex]t = 5\,s[/tex], then the uniform velocity is:

[tex]v = 0\,\frac{m}{s} + \left(2\,\frac{m}{s^{2}} \right)\cdot (5\,s)[/tex]

[tex]v = 10\,\frac{m}{s}[/tex]

The uniform velocity travelled by the car is 10 meters per second.

(Point b has been erased by the user)

c) The distance travelled by the car ([tex]\Delta x[/tex]), in meters, with uniform velocity is calculated by the following kinematic expression:

[tex]\Delta x = v\cdot t[/tex] (2)

If we know that [tex]v = 10\,\frac{m}{s}[/tex] and [tex]t = 10\,s[/tex], then the distance travelled is:

[tex]\Delta x = \left(10\,\frac{m}{s} \right)\cdot (10\,s)[/tex]

[tex]\Delta x = 100\,m[/tex]

The distance travelled by the car with uniform velocity is 100 meters.

Answer:

A longitudinal study is a research design that involves repeated observations of the same variables over short or long periods of time. It is often a type of observational study, although they can also be structured as longitudinal randomized experiments.

Explanation:

Answer:

See Explanation

Explanation:

The frequency of sound waves received by the microphone influences the output or pitch of the sound obtained from the microphone.

The higher the frequency of the sound received by the microphone, the higher the output of the microphone and vice versa. This is because, the higher the frequency of sound, the higher the oscillations produced and the greater the output of the microphone.

The rise and fall in the pitch of sound waves as the frequency of sound waves varies is called inflection.

Answer:

b

Explanation:

cuz im smart

Answer:

tie hair back

only burn the amount of chemicals as

directed by the lab procedure

Explanation:

The correct safety precautions for Amelia to take from the options would be to tie her hair back and to only burn the amount of chemicals recommended by the lab procedure.

With her hair left flowing freely, Amelia runs the risk of the hair catching flame while trying to burn the chemicals according to the procedure. Hence, tying her hair up into one neat bunch will limit the risk of it catching fire while working in the lab.

Also, burning less or more than the amount of chemicals recommended by the procedure may be dangerous or hinder Amelia from getting the right result.

Answer:

1,3

Explanation:

just did it