A box sliding down a hill going 3m/s accelerates at 2m/s2. How fast is going after 4 seconds.

Answer:

Series circuit

Explanation:

The type of circuit can be divided into series and parallel. In the series circuit, there is only one loop/path. If the path is cut or stopped, the current of the circuit will be stopped completely. A parallel circuit has more than one loops. This means the circuit has alternative paths that it can travel in case that one path is blocked or cut. This alternative path makes the parallel circuit have a lower resistance compared to the series.

Opposition for the current flow

Explanation:

Answer:

As per international agreement.

Explanation:

A chemical symbol is a mode to represent a chemical element. These symbols are named as per international agreements.

Answer:

a

Explanation:

Answer:

78g

Explanation:

Given parameters:

Mass of oxygen gas = 16g

Mass of potassium oxide = 94g

Unknown:

Mass of reacting potassium = ?

Solution:

To solve this problem, we need to obtain a balanced reaction equation. Then determine the number of moles of the reactant and use it to find that of the other one.

Balanced equation:

                      4K +   O₂   →    2K₂O

  Number of moles of reacting oxygen;

       Number of moles = [tex]\frac{mass}{molar mass}[/tex]

molar mass of  O₂ = 2 x 16 = 32g/mole

     Number of moles = [tex]\frac{16}{32}[/tex]  = 0.5mole

From the reaction equation;

          4 mole of K reacted with 1 mole of O₂;

           x mole of K will react with 0.5 mole of O₂

Therefore, 4 x 0.5 = 2 moles of potassium.

Mass of potassium = number of moles x molar mass

              Molar mass of potassium = 39g

Mass of potassium = 2 x 39 = 78g

The correct answer is option (1) and (2). The advantages of parallel circuits include If one bulb goes out, the other bulbs stay lit and If there is a break in one branch of the circuit, current can still flow through the other branches.

Parallel circuits offer several advantages, and you should check the statements that accurately reflect these benefits.

Here are the advantages of parallel circuits:

1. If one bulb goes out, the other bulbs stay lit.

2. If there is a break in one branch of the circuit, current can still flow through the other branches.

3. Parallel circuits are simple to design and build.

4. Parallel circuits are complicated to design and build.

5. If one bulb goes out, the other bulbs go out.

6. If there is a break in one branch of the circuit, current cannot flow at all.

The complete question is:

What are the advantages of parallel circuits? Check all that apply.

1. If one bulb goes out, the other bulbs go out.

2. If one bulb goes out, the other bulbs stay lit.

3. If there is a break in one branch of the circuit, current can still flow through the other branches.

4. If there is a break in one branch of the circuit, current cannot flow at all.

5. Parallel circuits are simple to design and build,

6. Parallel circuits are complicated to design and build.

Answer:

1.2

Explanation:

30/25=1.2 so 1.2*25=30

Answer:1.2 hours

Explanation:

distance=30km

Time=25hours

Speed=distance/time

Speed=30/25

Speed=1.2km/hr

To keep work output equal with a reduced force of 10 N, the object must be moved 100 m, based on the work formula showing that work equals force times distance.

To determine the distance an object must be moved with a different force while ensuring that the work input equals the work output, we use the work formula Work = Force × Distance. Initially, a 50 N force moves an object 20 m, so the work done is 50 N × 20 m = 1000 Joules. If the force is reduced to 10 N, to maintain the same amount of work (1000 Joules), the object must be moved a greater distance. We solve for the distance using the work formula, rearranging it to Distance = Work / Force. Thus, the new distance is 1000 Joules / 10 N = 100 m.

Answer:

Explanation:

Velocity is changing by a constant amount -10 m/s-in second of time.Anytime an object's velocity is changing,the object is said to be accelerating;it has an acceleration.

Answer:

[tex]\boxed{\mathrm{view \ explanation}}[/tex]

Explanation:

[tex]\displaystyle Acceleration =\frac{change \ in \ velocity}{elapsed \ time}[/tex]

[tex]\displaystyle A=\frac{V_f-V_i}{t}[/tex]

Answer:

increase

Explanation:

We need to find what change takes place to the acceleration of the object in the given situation.

The acceleration of the object would increase.

m = Mass of the object

a = Acceleration of the object

Force is given by

[tex]F=ma[/tex]

Acceleration would be

[tex]a=\dfrac{F}{m}[/tex]

It is given that force is constant so

[tex]a\propto \dfrac{1}{m}[/tex]

This means that acceleration is inversely proportional to mass.

Here, the mass is decreasing so the acceleration will increase.

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Answer:

0.027 J

Explanation:

The electric potential energy of the charge is given by:

[tex]U=qEd[/tex]

where:

q is the magnitude of the charge

E is the strength of the electric field

d is the distance of the charge from the source of the field

In this problem, we have:

[tex]q=4.5\cdot 10^{-5}C[/tex] is the charge

[tex]E=2.0\cdot 10^4 V/m[/tex] is the strength of the field

d = 0.030 m is the distance of the charge

So, its electric potential energy is

[tex]U=(4.5\cdot 10^{-5})(2.0\cdot 10^4)(0.030)=0.027 J[/tex]

Answer:

.027 J

Explanation:

Answer:

1) 5.83

2) 1.38

3) 4.22

Explanation:

The electrostatic force exerted tow electrons on each other is equal to  5.83  × 10⁻²⁹ N. The gravitational force is 1.38  × 10⁻⁷¹ N.

According to this law, the force of attraction between two charged particles can be written as the product of their charges on them and is the inverse of the square of the distance by which they are separated.

The magnitude of the electrostatic force between charges is given by:

[tex]\displaystyle F = k\frac{q_1q_2}{r^2}[/tex]

where k has a value of 8.99 × 10⁹ N.m²/C².

Given the charge on one electron, q₁ =  q₂ = 1.61 × 10⁻¹⁹

The distance between these two electrons, r = 2.00 m

The magnitude of electric force between the electrons will be:

F = 8.99 × 10⁻⁹ × (1.61 × 10⁻¹⁹)²/ (2.00)²

F = 5.83  × 10⁻²⁹ N

The gravitational force between two electrons is equal to:

[tex]\displaystyle F = G\frac{m_1m_2}{r^2}[/tex]

F' = 6.674 × 10⁻¹¹ × (9.1 × 10⁻³¹)²/ (2.00)²

F' = 1.38  × 10⁻⁷¹ N

F/F' = 4.23 × 10⁴² N

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The vertical component of the momentum of the volleyball is -0.49 kgm/s and the horizontal component is 38.93 kgm/s.

To find the vertical component of the momentum, we need to first find the vertical velocity of the volleyball. We can use the equation:

vf = vi + at

The initial vertical velocity is 0 m/s since the volleyball was sent up from rest. The final velocity can be found using the equation:

vf = vi + gt

where g is the acceleration due to gravity. Plugging in the values and solving for vf, we get:

vf = 0 + (-9.8 m/s^2)(0.05 s)

vf = -0.49 m/s

Since the downward direction is considered negative, the vertical component of the momentum is -0.49 kgm/s.

To find the horizontal component of the momentum, we can use the equation:

p = mv

where p is the momentum, m is the mass of the volleyball, and v is the horizontal velocity. The horizontal velocity can be found using:

vx = v * cos(theta)

where theta is the angle above the horizontal. Plugging in the values, we get:

vx = 45 m/s * cos(30 degrees)

vx = 38.93 m/s

Therefore, the horizontal component of the momentum is 38.93 kgm/s.

Answers:

a. Change in acceleration

b. Not change in acceleration.

c. Not change in acceleration.

d. Change in acceleration

Explanation:

Let's begin by explaining what acceleration is:

Acceleration [tex]a[/tex] is initially defined as the variation of Velocity [tex]\Delta V[/tex] in time [tex]\Delta t[/tex]:  

[tex]a=\frac{\Delta V}{\Delta t}[/tex]  

However, we cannot forget acceleration is a vector quantity as well (like velocity) and as a vector it has magnitude and direction.

So, when one of these aspects changes (or both) acceleration changes as well.

In other words: A change in acceleration implies the change in velocity, or a change in direction, or both.

Having this clear, we can identify the statements that describe a change in acceleration:

a. A car stopped at a stop sign.

Change in acceleration, since the car changed its velocity.

b. A boat traveling east at 10 knots.

Not a change in acceleration, since the boat is travelling at a constant velocity and is not changing its direction.

c. An airplane traveling north 600 miles per hour.

Not a change in acceleration, since the airplane is travelling at a constant velocity and is not changing its direction.

d. A person running at 5 meters/second along a curving path

Change in acceleration, since the person is changing its direction in the curving path.

Answer:

point guard, center, middle

Explanation:

Explanation:

let the magnitude of the vector be |A|

|A| = ✓11^2 + 17^2 =

|A| =✓410

|A| = 20.23

theta =Tan^-1(11/17) =32.91°

Explanation: edmentum answer

Answer:Use two magnants with opposite poles South and north attract to each other same poles push away. So using two magnants as the forces that will attract each other.

Explanation: I feel like this is how I would go about it but If it is wrong I apologize but I don't know what else they would want. So that said Good luck :) hope this helps.

Use two magnet of opposite poles to  set up an experiment in which the forces attract each other. In this  set up, the poles of the magnet must be opposite and it can be easily demonstrated as an experiment in which the forces attract each other.

The attraction or repulsion of magnetic force results from the motion of electrically charged particles. It is the fundamental force behind phenomena like how electric motors operate and how magnets are drawn to iron.

Among fixed electric charges, there are electric forces; among moving electric charges, there are both electric and magnetic forces. The influence of a magnetic field generated by one charge on another charge can be referred to as the magnetic force between two moving charges.

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Salt water offers the least electrical resistance.

Explanation:

Least electrical resistance indicates that any material which readily allows the electric current through itself, and shows more conductivity.

Here pure water doesn't contain any ions, so it is a bad conductor.

Wood and glass are also bad conductors of electricity.

Salt water contains ions, which conducts electricity which means it shows least electrical resistance.

Answer:

salt water

Explanation:

The formation ice sheets cause the Earth's surface to sink so much that when the ice melts, the crust and mantle does not rebound.

Explanation:

The above-mentioned statement is the only false statement

During the Ice ages, large continental parts were covered under thick ice sheets. This imposed a superincumbent additional load on the Earth's crust.

Isostasy refers to the balance that exists between parts of Earth's mantle and crust.  Isostatic adjustments are a common phenomenon.  As a result of isostatic adjustments, several parts of the world have risen by as much as 900 feet as an adjustment to superincumbent load since ice ages. E.g. Parts of Scandinavian countries have witnessed these activities and also undergoing this process.

Answer: d

Explanation:

Answer:

Explanation:

a. Mechanical advantage

The mechanical advantage of a system of pulleys is the ratio of the ouput force (weight of the object) to the input force (pulling force):

b. Work input

Work is the product of the force applied by the distance traveled in the same direction:

c. Work output

Using the law of conservation of energy, the work output is equal to the change in the potential energy of the block:

d. Efficiency

The efficiency is the ratio of the work output to the work input:

You can check that the efficiency is also the ratio of the mechanical advantage to the ideal mechanical advantage

The ideal mechanical advantage is equal to the ratio of the input distance (pulling distance) to the output distance (lift distance):

Answer:

B) 5

Explanation:

Pedigree charts can be read like family trees, and you can trace a trait through families. Squares usually refer to males, and circles refer to females. Shaded shapes usually refer to the presence of a specific trait, whereas blank shapes are those who do not possess the trait of interest.

The horizontal line between 1 and 2 shows that these individuals have had offspring.

If you follow that vertical line down to the next level, you can see it forms 5 branches - to individuals 3, 5, 7, 8 and 10. Therefore, 1 and 2 had five offspring.

Then, individual 3 had two children with individual 4 (see the horizontal line) - individuals 11 and 12.

Individual 5 had three children with individual 6 - individuals 13, 14, and 15.

Individual 7 did not have any children. Neither did individual 8

Individual 10 had four children with individual 9 - individuals 16, 17, 18 and 19.

The gravity has traditionally been defined as a force of attraction between things that have masses.

Explanation:

Gravitational force is a type of attractive force. It is because of this force, that we are able to walk on this Earth. Also due to gravitational force, the solar system and the galaxies are existing in the universe. Sir Issac Newton first discovered this force. He postulated the universal law of gravity. And according to this law, the gravitational force will be acting between the objects having masses and separated by a distance. So in this law, it states that gravitational law is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

Thus, the gravity has traditionally been defined as a force of attraction between things that have masses.

Answer:

Letter D is not a reason to warm up.

Answer:

d

Explanation:

Answer:

Length of the pipe is 33.2 cm

Explanation:

As we know that the frequency of the sound in open end pipe is given as

[tex]f = \frac{v}{2L}[/tex]

so here we will have

f = 512 Hz

v = 340 m/s

so now we have

[tex]512 = \frac{340}{2L}[/tex]

[tex]L = \frac{170}{512}[/tex]

[tex]L = 33.2 cm[/tex]

Final answer:

To calculate the length of a tube open at both ends with a given frequency and speed of sound, we can rearrange the formula ν = v / (2L) and solve for L, giving a length of 0.332 m for a 512 Hz tuning fork.

Explanation:

A tuning fork vibrating at 512 Hz is held near one end of a tube of length that is open at both ends. The tube resonates at its fundamental frequency. To calculate the length of the tube given the speed of sound in air is 340 m/s, we use the formula for the fundamental frequency of a tube open at both ends, which is ν = v / (2L), where ν is the frequency (512 Hz), v is the speed of sound (340 m/s), and L is the length of the tube we are looking for.

Rearranging the formula, we get L = v / (2ν). Plugging in the numbers, L = 340 m/s / (2 × 512 Hz) = 0.33203125 meters, which can be rounded to 0.332 m or 33.2 cm.

Answer:

a) [tex]r = 3.820\,m[/tex], b) [tex]v\approx 10.472\,\frac{m}{s}[/tex]

Explanation:

a) The needed length is found by the following formula:

[tex]r = \frac{v}{\omega}[/tex]

[tex]r = \frac{40\,\frac{m}{s} }{(100\,rpm)\cdot(\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )}[/tex]

[tex]r \approx 3.820\,m[/tex]

b) The required speed is:

[tex]v = \omega \cdot r[/tex]

[tex]v = (100\,rpm)\cdot (\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )\cdot(1\,m)[/tex]

[tex]v\approx 10.472\,\frac{m}{s}[/tex]

Final answer:

The sling must be 3.82 meters long for the object at the end to travel at 40 meters per second, while an object at the end of a 1-meter long sling will travel at 10.47 meters per second. Over one hour, the sling makes 6000 revolutions.

Explanation:

Calculating the Length of Sling and Speed of an Object

To calculate the length of the sling so that the speed of the object at the end will be 40 meters per second, we use the relationship between linear speed (v), radius (r), and angular speed (ω). The linear speed is given by the equation v = r ω, where ω must be in radians per second. For 100 rpm, we convert to radians per second:

ω = 100 rev/min × (2π rad/rev) × (1 min/60 s) = 10.47 rad/s

The required radius (or length of the sling) is then: r = v/ω = 40 m/s / 10.47 rad/s = 3.82 meters.

To find out how fast the object at the end of a 1 meter long sling would be traveling, we use the same formula: v = r ω = 1 m × 10.47 rad/s = 10.47 m/s.

Over one hour, the number of revolutions would be 100 rpm × 60 min/hour = 6000 revolutions.

Answer:

The short answer is that velocity is the speed with a direction, while speed does not have a direction.

Explanation:

Speed is how fast an object is moving. It is calculated by the displacement of space per a unit of time. Velocity is the rate at which an object changes position in a certain direction. It is calculated by the displacement of space per a unit of time in a certain direction. Velocity deals with direction, while speed does not.

Answer:

velocity is speed with direction

Explanation: