Hi, I'm having a lot of trouble with this one. The answer I got to was 407.91 but I'm not confident in it.

Answer:

A How fast does a skateboard move at the bottom of a ramp?

Explanation:

How fast does a skateboard move at the bottom of a ramp is a scientific question about skateboarding.

'A' is the only one that can be tested and measured.

'B' and 'D' ask for 'best'. 'C' asks 'should'. These are things that can't be measured, and they're individual opinions anyway.

F = 0.06N. Since the charges has different signs the force of atraction between them is 0.06N.

In order to solve this exercise we have to use Coulomb's Law equation which says that the magnitude of each of the electric forces with which two point charges at rest interact is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them. Given by the equation:

[tex]F = k\frac{|q_{1}q_{2}|}{d^{2}}[/tex]. Where k is the Coulomb's Constant [tex]k = 9x10^{9}\frac{Nm^{2} }{C^{2} }[/tex], q1 and q2 are the charges value in Coulomb (C), and d is the distance between charges in meters (m).

There are two balloons of charges +3.37 x 10-6 C and –8.21 x 10-6 C. The distance between the two balloons is 2.00 m. Calculate the force between the two ballons.

[tex]F = 9x10^{9}\frac{Nm^{2} }{C^{2} } \frac{|(3.37x10^{-6}C)(-8.21x10^{-6}C)|}{(2.00m)^{2}}\\F = 9x10^{9}\frac{Nm^{2} }{C^{2} } \frac{|-2.77x10^{-11}C^{2} )|}{4.00m^{2}}\\F = 9x10^{9}\frac{Nm^{2} }{C^{2} }(6.92x10^{-12})\frac{C^{2} }{m^{2}}\\F = 0.06N[/tex]

Explanation:

There are two forces acting on the ruler: weight pulling down halfway at the 50cm mark, and the upward force at the 60cm mark.

Sum of the moments about the pivot:

∑τ = Iα

F (0.60) − (0.200) (9.8) (0.50) = 0

F = 1.63 N

Answer:

The force needed is 1.7N

In Chemistry, pH levels can be determined using acid-base indicators or pH paper which change color to reflect the acidity or alkalinity of a solution. Substances with pH less than 7 are acidic, while those with pH over 7 are basic. The concentration of hydrogen ions can also be used to determine pH.

The pH level of a substance can be determined using acid-base indicators or pH paper which change color in relation to the acidity or alkalinity of the solution. The pH scale measures from 0 to 14, with 7 being neutral. Anything below 7 is considered acidic, and anything above 7 is basic or alkaline. For example, if using pH paper or an indicator, a solution that colors the paper or indicator red or orange is likely to be acidic, whereas a green or blue color suggests a basic solution. The specific color can provide a rough estimate of the pH value, with some indicators or pH papers providing more precise value ranges.

Another method to measure pH is by examining the concentration of hydrogen ions in the solution. A lower pH value indicates a higher concentration of hydrogen ions, making the solution more acidic. Conversely, a higher pH value indicates a lower concentration of hydrogen ions, making the solution more basic or alkaline.

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The momentum of an object is the product of its mass and its velocity.

The momentum p is related as, p = mv

Explanation:

Momentum of an object is defined by the two variables;

(i) mass of the object

(ii) velocity at which the object travels.

Hence momentum is the product of the above two variables it is directly proportional to them and it is represented by the unit (kg.m) / s where kg represents the mass of the object, m / s  for velocity of the object.

Explanation:

13 cmHg (centimeters of mercury) is the pressure at the bottom of a column of mercury 13 cm deep.  It is the equivalent of about 17.3 kPa or 2.5 psi.

Explanation:

Near the surface of the Earth (sea level), gravity decreases with height such that linear extrapolation would give zero gravity at a height of one half of the Earth's radius - (9.8 m. s−2 per 3,200 km.)

Height from the earth, g becomes g/2.

Height from the earth, g becomes g/2.

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Answer:

0.076 m/s

Explanation:

Momentum is conserved:

m v = (m + M) V

(0.111 kg) (55 m/s) = (0.111 kg + 80. kg) V

V = 0.076 m/s

After catching the puck, the goalie slides at 0.076 m/s.

The speed with which the goalie slide on the frictionless ice is  0.076 m/s.

From the principle of conservation of linear momentum;

Momentum before collision = momentum after collision

Mass of the  hockey puck = 0.111 kg

Speed of the  hockey puck =  55 m/s

Mass of the goalie = 80 kg

Speed of the goalie = 0 m/s

Following the law of conservation of linear momentum;

(0.111 kg × 55 m/s) + (80 kg  × 0 m/s) = (0.111 kg + 80 kg) V

V = (0.111 kg × 55 m/s) + (80 kg  × 0 m/s)/ (0.111 kg + 80 kg)

V = 6.105/80.111

V = 0.076 m/s

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Answer: a. the magnetic field surrounding a long, straight wire

Explanation:

The Biot-Savart law was formulated by Jean Baptiste Biot and Felix Savart and describes how a magnetic field is generated by a stationary electric current.

In other words:

The law formulated by Biot and Savart relates the magnetic fields with the currents that create them.

Therefore, the correct option is a.

The magnetic field surrounding a long, straight wire.

Answer:

a) the magnetic field surrounding a long, straight wire

Explanation:

The Biot-Savart force law states that when an electrical conductor is passed through an electric current, a magnetic field will spontaneously appear around it. A characteristic of this magnetic field is that it is constituted by lines of force that are circular so that we can place compasses at different points at the end of the field and the north of each one will always face the tangential direction of the lines of the field.

This effect was discovered by Hans Christian Oersted, who realized through experiments that a magnetic needle positioned parallel to an electrical conductor would undergo significant deflection in relation to its original position. We can know the direction and direction of the magnetic field generated through the Right Hand Rule and its value at different points through the Biot-Savart Law.

Answer:

A. nucleus

Explanation:

Protons are found in the nucleus of the atom.

Answer: (B) Classify

Explanation:

 The classify is not the part of the inquiry process as the inquiry process are basically based on the different types of observations and then summarize it properly after the investigation. Without any observation we cannot classifying the specific things.

The inquiry is the process that include investigation planning and making the proper observation about the incident.

Then, collect all the related information and summarize all the process. It also include analyzing process, interpretation of the data and reviewing process.

Therefore, option (B) is correct.

Answer: D. If you look at the claims with critical thinking then you will be less likely to be fooled by something false

Answer: d. critical thinking  

Explanation:

A scientific claim is a statement which is based on evidences obtained after the experimental trials and direct observatory approach of the process occurring in the nature.  

Critical thinking based on the approach of verification and analysis can be used to evaluate the scientific claims. The result of evaluation will be reliable and acceptable. The evaluation should not be biased or presumed it will yield inappropriate results.

Answer:

D

Explanation:

Whatever question mark is, it will have to have a 1 taken away from the atomic number of Br.

The atomic mass of the electron doesn't change anything, so whatever ? is, it has a mass of 85.

Since ? is 85 / 34 Se, the answer much be D

Answer:

85 36 Kr

Explanation:

yeah

Explanation:

y = y₀ + v₀ᵧ t + ½ gt²

where y is the final height,

y₀ is the initial height,

v₀ᵧ is the initial vertical velocity,

g is the acceleration due to gravity,

and t is time.

0 m = 0 m + (5 sin 55º m/s) t + ½ (-9.8 m/s²) t²

0 = 4.10 t − 4.9 t²

0 = t (4.10 − 4.9 t)

t = 0, t = 0.84

The bobcat lands after 0.84 seconds.

Answer:

0.84

Explanation:

Apex ; good luck with your tests!

Force that acts on area is defined as pressure,

[tex]p=\dfrac{F}{A}[/tex]

If we solve for area,

[tex]A=\dfrac{F}{p}[/tex]

Now put in the data.

[tex]A=\dfrac{5N}{500Pa}=\boxed{0.01m^2}[/tex]

The area of surface is 0.01m^2

Hope this helps.

r3t40

Answer:

Galaxy MACS0647-JD

Explanation:

Answer:

Open energy system models are energy system models that are open sources.

Answer:

False

Explanation:

Distance is a sclalar quantity as it has only magnitude and no dirction.

Vector quantities have both magnificent and direction.

HOPE IT HELPS....

It is false that Distance is a vector quantity. Distance is not a vector quantity; it is a scalar quantity. Scalar quantities are physical quantities that have only magnitude and no direction.

They are described completely by their numerical value and units.

On the other hand, vector quantities have both magnitude and direction, and they are represented by arrows in a specific direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.

When we talk about distance, we are only concerned with the total length or magnitude of the path traveled by an object or the space between two points, without regard to the direction of motion. Since it lacks a specific direction, distance is considered a scalar quantity.

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Answer:

LinkedIn is a social community, or social network where connections are created between employers and employees.

A typical user creates an account, fill in their employment history, achievements and personal goals, and starts making contact with people that work in similar fields and could offer potential job opportunities.

LinkedIn is a popular tool for people looking to find jobs and new positions. You talk to people in your chosen career field, in different geographic areas, and once they look at the profile you have created, you could become a potential candidate for a job offer.

Speed of the block at the bottom of the incline: 5.42 m/s

The first part of the problem can be solved by using the law of conservation of energy. Since the ramp is frictionless, the initial gravitational potential energy of the block at the top of the ramp is converted into kinetic energy at the bottom:

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

where

m is the mass of the block

g = 9.8 m/s^2 is the acceleration of gravity

h is the initial height of the block

v is the speed of the block at the bottom

The initial height of the block is equal to the height of the ramp, so

[tex]h=L sin \theta[/tex] (2)

where

L = 3.00 m is the length of the ramp

[tex]\theta=30^{\circ}[/tex] is the angle of the ramp

Substituting (2) into (1) and re-arranging the equation, we  find the speed

[tex]2gL sin \theta = v^2[/tex]

[tex]v=\sqrt{2gL sin \theta}=\sqrt{2(9.8)(3.00)sin 30^{\circ}}=5.42 m/s[/tex]

Coefficient of kinetic friction between the floor and the block: 0.3

In the second part of the motion, the block is slowed down by friction along the flat surface. According to the work-energy theorem, the work done by friction is equal to the change in kinetic energy of the block:

[tex]W=\Delta K=K_f -K_i[/tex]

where

W is the work done by friction

Kf is the final kinetic energy of the block, which is zero since the block comes to rest

[tex]K_i = \frac{1}{2}mv^2[/tex] is the initial kinetic energy of the block, where

m = 10.0 kg is the mass of the block

v = 5.42 m/s is its initial speed

Substituting into the equation, we find

[tex]W=-\frac{1}{2}mv^2=-\frac{1}{2}(10.0)(5.42)^2=-146.9 J[/tex]

and the work is negative, since the direction of the force of friction is opposite to the direction of motion of the block.

Now we can rewrite the work as the product between the force of friction and the displacement of the block:

[tex]W=-F_f d = - \mu mg d[/tex]

where

[tex]\mu[/tex] is the coefficient of friction

d = 5.00 m is the displacement of the block

Solving for [tex]\mu[/tex],

[tex]\mu = - \frac{W}{mgd}=-\frac{-146.9}{(10.0)(9.8)(5.00)}=0.3[/tex]

Answer:

5 m/s upward and 5 m/s downward

Explanation:

Let's call v the speed of each elevator. So one elevator is moving with velocity +v relative to the ground (the positive sign indicates the upward direction) and the other one with velocity -v relative to the ground (downward direction).

The relative velocity of one elevator to another is 10 m/s, so we can write:

[tex]+v = -v + 10[/tex]

which means

[tex]+2v=10\\v = 5 m/s[/tex]

So the speed of each elevator relative to the ground is 5 m/s, with one moving upward and the other one moving downward.

Answer:

Explanation:

I'm not  sure you can do this without just a bit more information. I can tell you what the mass of the water is when the rocks are removed. When we know that, we know the volume of the water that was displaced. whether or not this is enough information to determine the volume of the box, I'm not sure.

400 grams raises the box 1 cm.

The density of water = 1 gm / cm^3

400 grams of water = 400 mL or 400 cm^3

The volume of the displaced water = 400 cm^3

The volume a slice from the square prism is B*h

B = 400 cm^2

h = 1 cm

If the base is 400 cm^2 then each side is

s^2 = 400

sqrt(s^2)= sqrt(400)

s = 20

The volume of the box is 20^3 = 8000 cm^3

Answer:

D) 0°

Explanation:

If vectors A and B add up to vector C, then vector C must start where A starts and end where B ends.

Since we also know the magnitudes of A and B add up to the magnitude of C, then A, B, and C must be inline with each other.

Therefore, the angle between A and B is 0°.

Answer:

skates

Explanation:

Ice hockey is considered to be an extremely tough sport in which there are twelve players who fights over small 3" puck which can be launched like a missile. If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women).

Here we can see that correct choice is ice skate which is important for supporting player's ankles while playing ice hockey.

Hope it helps!

Answer:

921 g

Explanation:

If S is the mass of silver and G is the mass of gold, then the total mass is:

S + G = 1050

And the total volume is:

S/10.5 + G/19.3 = 60

Using substitution:

S = 1050 − G

(1050 − G)/10.5 + G/19.3 = 60

(1050 − G) (19.3) + G (10.5) = 60 (19.3) (10.5)

20265 − 19.3G + 10.5G = 12159

8106 = 8.8G

G = 921.1

Rounded to 3 significant figures, the mass of the gold is 921 grams.

The mass of gold in the alloy can be determined by using the given alloy mass, volume, and the known densities of gold and silver. By setting up the appropriate equations and solving, we find that the alloy contains approximately 816.4g of gold.

The mass (M) is the total amount of gold and silver present in the alloy and can be represented as M = M_gold + M_silver, where M_gold and M_silver are the masses of gold and silver respectively. Given that the total mass of the alloy is 1050g, and the total volume is 60cm³, we can calculate the mass of gold using the known densities for gold and silver (19.3g/cm³ and 10.5g/cm³ respectively).

The volume of each metal in the alloy is given by the formula: Volume = Mass/Density. Therefore, for the alloy, we have 60cm³ = M_gold/19.3g/cm³ + M_silver/10.5g/cm³. We know that M_silver = 1050g - M_gold. Substituting M_silver into the volume equation and solving for M_gold yields a value of approximately 816.4g of gold in the alloy.

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Answer:

an element is a pure substance whereas a compound is a mixture of two or more elements.

The basic difference between a compound and an element is its constituents, in which the element is a pure individual chemical substance which has similar atom and compound is a mixture of two or more elements bounded chemically.

Explanation:

Elements:

Compounds:  

Electrical symbols in circuit diagrams are crucial for understanding and communicating complex electrical concepts and layouts. They represent key components like wires, power sources, resistors, and ground in a standardized, universally understood format. This foundational knowledge is essential for anyone in the field of electrical engineering or anyone interfacing with electrical technology.

The importance of electrical symbols in circuit diagrams and the broader field of electrical engineering cannot be overstated. These symbols serve as a universal language that allows scientists, engineers, and technicians to succinctly communicate complex electrical concepts and circuit layouts without the need for lengthy explanations. The main symbols in circuit diagrams include the wire, which represents the pathway for electrical flow; the battery or voltage source, supplying the energy; resistors, which control the flow of electric current; and the ground, indicating a common return path for an electrical current.

Understanding these symbols and their applications is crucial for anyone involved in the study or practice of electrical engineering. Electrical schematics simplify the analysis of circuits, which can range from simple battery connections in small devices to complex electric circuits in high-tech equipment. This simplified representation is essential for designing, troubleshooting, and improving electrical systems. Moreover, the advancement in electrical science significantly owes to the standardized terminology and symbolism that emerged over the past few decades, making it easier for professionals to communicate their ideas and understandings effectively.

Lastly, in the real world, we depend heavily on electricity and electrical appliances, making the study of electrical circuits vital. Knowledge of these symbols and how to interpret circuit diagrams equips individuals with the ability to understand the workings of everyday technology, from computers to household appliances, especially in troubleshooting and maintenance.

Answer:

Yes if the hunter has great accuracy it would hit the monkey, It might even hit it in a more fatal spot. For example, if you were aiming at the belly area and he dropped as you took the shot then maybe it hits more towards a deadly organ or the brain. Bullets travel insanely fast speeds, and I hunt so yes, it would definatly hit the monkey if the hunter was accurate

Hope this helps ya' :)

Good Luck :D

The bullet will hit the monkey as they both are subjected to the same gravitational pull and fall to the ground at the same rate after the rifle is fired and the monkey drops.

The subject of this question is Physics. The situation described here is a perfect example of Projectile Motion and gravitational force.

When a bullet is fired horizontally (assuming the absence of air resistance), it will start to drop immediately due to earth's gravity. Similarly, when the monkey observes the flash of the fire and drops, it is subjected to the same gravitational pull. Therefore, it doesn't matter that the monkey lets go of the tree because the bullet and the monkey both fall towards the earth at the same rate. So, if the hunter aims directly at the monkey at the instant it drops, the bullet will hit the monkey.

This question highlights an interesting point about projectile motion and how gravitation plays an important role in it. It ensures that all objects near earth fall to the ground at the same rate, regardless of their horizontal motion.

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