Two glass rods are rubbed together. One of the glass rods are brought near (but
does not touch) an uncharged pith ball. Would you expect the pith ball to attract,
repel, or do nothing? Explain why.

Answer:

[tex]a=0.276[/tex]

Explanation:

From the question we are told that:

Mass [tex]m=98.kg[/tex]

Radius [tex]r=0.335[/tex]

Angular velocity [tex]\omega=100rpm[/tex]

Radial force of [tex]F_r=23.6 N.[/tex]

Kinetic coefficient of friction  [tex]\mu=0.192[/tex]

Generally the equation for Kinetic Force is mathematically given by

 [tex]F_k=\mu.F_r[/tex]

 [tex]F_k=0.192*23.6[/tex]

 [tex]F_k=4.5312[/tex]

Generally the equation for Torque on Center is mathematically given by

 [tex]Ia=f_k*r[/tex]

Where

 [tex]I=\frac{Mr^2}{2}[/tex]

Therefore

 [tex]a=\frac{2f_k}{Mr}[/tex]

 [tex]a=\frac{2*4.5312}{98*0.335}[/tex]

 [tex]a=0.276[/tex]

Therefore Angular acceleration of the grindstone is

[tex]a=0.276[/tex]

Answer:

[tex] 0.625 \: g {cm}^{ - 3} [/tex]

Explanation:

[tex]density \: = \frac{mass}{volume} \\ \\ = \frac{250}{400} \\ \\ = 0.625 \: g {cm}^{ - 3} [/tex]

Answer: First stage

Explanation:

The four stages of technological design include:

• identifying a problem.

• Designing a solution.

• Implement, build, and test the design.

• Determine if solution met the need.

In this scenario, Robert Shuman identified the problem. This was depicted as he stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun,

Answer:

2,340,000 J

Explanation:

Work done can be described as when energy or force is applied to an object to cause displacement

Work done is measured in joules

1 Watt = 1 Joule / second

650 watts = 650 Joules / second

convert 650 joules to seconds by multiplying by 3600

650 x 3600 = 2,340,000 J

Answer:

liquid phase

Explanation:

it is liquid phase because molecules are not that tightly packed as solid and not that far away from each other as in gas phase.

Answer:

Explanation:

B

Answer:

A: -2.6 × 10^(-6) C and 2.6 × 10^(-6) C

Explanation:

According to coulombs law, the formula for the force between 2 charged particles is;

F = kq1•q2/r²

Where;

F is Force = |1N|

q1 and q2 are the charges of both particles

k is coulombs constant = 9 × 10^(9) N.m²/C²

r is distance between particles = 0.25

Now, the force |1N| means -1 or +1

Thus;

-1 = 9 × 10^(9) × q1•q2/(0.25)²

Or

1 = 9 × 10^(9) × q1•q2/(0.25)²

Thus;

q1•q2 = -6.94 × 10^(-12)

Or q1•q2 = 6.94 × 10^(-12)

Now, we are told that the magnitude of both charges are the same.

Thus;

q² = 6.94 × 10^(-12)

q = √(6.94 × 10^(-12))

q = 2.6 × 10^(-6) C

Since from earlier, we saw that;

q1•q2 = -6.94 × 10^(-12)

Or q1•q2 = 6.94 × 10^(-12)

Thus means that one of the charges will be negative while the other will be positive.

Thus, the charges are;

-2.6 × 10^(-6) C and 2.6 × 10^(-6) C

Answer:

Initial velocity, u = 23.33 m/s

Explanation:

Given the following data;

Acceleration = 2.5 m/s²

Distance = 4 km to meters = 4000 meters

Time = 0.8 mins to seconds = 0.8 * 60 = 48 seconds.

To find the initial velocity, we would use the second equation of motion;

[tex] S = ut + \frac {1}{2}at^{2}[/tex]

Where;

S represents the displacement or height measured in meters.

u represents the initial velocity measured in meters per seconds.

t represents the time measured in seconds.

a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

4000 = u*48 + ½*2.5*48²

4000 = 48u + 1.25*2304

4000 = 48u + 2880

48u = 4000 - 2880

48u = 1120

Initial velocity, u = 1120/48

Initial velocity, u = 23.33 m/s

Answer:

your voice travels much more quickly across your vocal cords, also LOT less density which causes the sound to  travel over twice as fast through helium than it does regular air.

ballon Air = Helium

Hope this helps and brainlist is appreciated !

- ☾

Answer: 7.2%

Explanation:

Given

Efficiency of converting energy produced by wind into electricity is about [tex]\eta_1=40\%[/tex]

Transport of electricity efficiency [tex]\eta_2=90\%[/tex]

Fluorescent light bulb efficiency is [tex]\eta_3=20\%[/tex]

Overall efficiency is the product of all the efficiencies i.e.

[tex]\Rightarrow \eta=\eta_1\times \eta_2\times \eta_3\\\\\Rightarrow \eta=0.4\times 0.9\times 0.2\\\Rightarrow \eta=0.072\ \text{or}\ 7.2\%[/tex]

Therefore, the overall efficiency is 7.2%

The correct answer to this open question is the following.

Unfortunately, you did not attach the article or the text. You also forgot to attach the options for the question.

However, trying to help you we did some deep research and can comment on the following.

The statement that describes the central idea of the text is "Baseball can be explained and improved by collecting data and studying the natural laws at play in the sport."

You are referring to the article written by Stephen Ornes, of August 21, 2013, for Science News for Students.

The author refers to the idea that baseball and physics are related and can be understood through the "eyes" of science. Statistics bring interesting data to help understand the game.

And this idea is correct because today, baseball coaches and other sports coaches as is the case of football, use a series of statistics and data to better hire talent for their respective teams, as well as to better create plans and game strategies derived from the results and interpretation of data.

Explanation:

is this the full question?

Answer:

1258.46

Explanation:

Acellus

Answer:

E = 4000 N/C

Explanation:

Given the following data;

Force = 0.080 N.

Charge, q = 20 microcoulomb = 20 * 10^-6 = 2 * 10^-5 Coulombs

To find the electric field strength;

Mathematically, the electric field strength is given by the formula;

Electric field strength = force/charge

Substituting into the formula, we have;

E = 0.080/0.00002

E = 4000 N/C

sea water is the answer to your question

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Sound travels faster in steel than in water. Similarly, sound travels faster in water than in air. This is because in solids, the distances between the molecules are closer and thus the atoms are more densely packed than in gases and liquids

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

The friction of braking heats up the tire and the road. The temperature is so high that it reaches the melting point of the rubber in the tire. The melting rubber is what leaves a mark on the road.

Explanation:

Answer:

the friction of braking heats up the tires and the road. then the temperature gets even hotter to the point where it melts the rubber.

Explanation:

this is my answer so be careful how you copy it, but you've got this guys schools is almost out stay strong an have fun and be safe this summer keep pushing <33.

remember you're loved by many

- Jason Edwards 5/15/23

Answer:

That's essentially how objects in orbits work as they move closer to the body they orbit, they accelerate faster and faster. Our penny will get so fast that, once it comes around the planet, it will be flung very far away, which will then slow it down. This is what creates an elliptical orbit.

Explanation:

Answer:

d. wavelength/2.

Explanation:

The circular motion of water molecules extends from regions of shallow water to deep water. It ranges from a depth, H < L/20 for shallow water to a depth of H > L/2 for deep water where L is the wavelength of the wave.

For depths greater than L/2,the circular motion is not affected by the wave energy. So, the maximum depth for the circular motion is L/2 = wavelength/2.

Answer: 1.67 m/s

Explanation:

Given

Mass of bag is [tex]m=8.6\ kg[/tex]

Mass of cart is [tex]M=18.1\ kg[/tex]

bag hits the cart with horizontal speed of [tex]u=5.2\ m/s[/tex]

Suppose the system move with speed v after collision

Conserving the momentum

[tex]\Rightarrow mu+M(0)=(M+m)v\\\\\Rightarrow v=\dfrac{mu}{M+m}\\\\\Rightarrow v=\dfrac{8.6\times 5.2}{18.1+8.6}\\\\\Rightarrow v=1.67\ m/s[/tex]

Answer:

The mass density (ρ)

Explanation:

The molar volume (Vm) is the volume that a mole of an element or compound occupies at standard temperature and pressure STP

The molar volume can be found as follows;

[tex]Vm = \dfrac{Mm}{\rho}[/tex]

Where;

Mm = The molar mass

ρ = The mass density

The molar mass (Mm) of an element or a compound is the ratio of the mass of the element or compound to the amount of the element or compound in the given mass

The mass density, ρ, of an element or a compound is the mass of a unit volume of the element or compound

Therefore, we have;

[tex]\rho = \dfrac{Mm}{Vm}[/tex]

When we divide the molar mass (Mm) by the by the molar volume (Vm), we obtain the mass density (ρ).

Answer:

Full and New Moon

Explanation:

Precaution: balance the ruler being used first.

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.Measure distances from the pivot to the centre of mass of the object.

Answer:

Answer:

The velocity of the ball when it reaches its highest point is  0

Explanation:

The velocity of the ball when it reaches its highest point is 0

Once the ball is tossed into the air, as it goes up, the initial velocity with which it was thrown, reduces, as the motion of the ball is hindered by several forces such as gravity and air resistance. This slows down the velocity of the ball, up until it reaches a point, where the upwards velocity of the ball becomes zero. at this point, the ball begins to fall back to the ground.

In short :

An object is said to be at rest when it doesn't change is position with respect to a stationary object which is taken as its reference point or origin of the object, as the time passes.

Answer:

anashe

Explanation:

full

Answer:

w=fxd

w=3.5x4

w=14

this is the correct answer

Answer:

1) - 35

2) - 35

3) - 67

4) - 83

Answer: B

Explanation: The higher temperature increases the reaction rate but also favors the reverse read on.

The higher temperature increases the reaction rate, but it also favors the reverse read on. So, option B.

The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction.

Here,

Generally, reactions progress more quickly as the temperature rises.

The average kinetic energy of the reactant molecules will rise with a rise in temperature. The number of molecules having threshold energy rises, increasing the quantity of efficient collisions that actually occur.

Therefore, as the temperature of the reaction is increased, the rate of the reaction increases. But also favors the reverse reaction.

Hence,

The higher temperature increases the reaction rate, but it also favors the reverse read on.

To learn more about rate of reaction, click:

https://brainly.com/question/30546888

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0.23 A across the 20-ohm resistor

Explanation:

The 20-ohm and 35-ohm resistors are in parallel so their combined resistance is

(1/20) + (1/35) = 0.0786 ohm^-1 or 12.73 ohms

These two are in turn connected in series with the 15-ohm resistor so the total resistance of the circuit is

R = 12.73 ohm + 15 ohm

= 27.73 ohm

Hence, the total current drawn by the circuit is

I = V/R = (10 V)/(27.73 ohm)

= 0.36 A

The potential across the 15-ohm resistor is

V1 = IR = (0.36 A)(15 ohm)

= 5.4 V

Now the potential across the 20-ohm and 35-ohm resistors is

V2 = V - V1 = 10V - 5.4V

= 4.6 V

This means that the current across the 20-ohm resistor is

I = V/R = (4.6 V)/(20 ohm)

= 0.23 A

Answer:

Answer would be 0.23

Explanation:

Put in 0.23