what is the answer to this question I don't know it​

Answer: Kinetic or Thermal

Answer:

(i) 0.121 kg m²

(ii) 0.363 kg m²/s

(iii) 2 rad/s

Explanation:

(i) The moment of inertia of a rod about its end is:

I = 1/3 mr²

where m is the mass and r is the length.

Given m = 1.2 kg and r = 0.55 m:

I = 1/3 (1.2 kg) (0.55 m)²

I = 0.121 kg m²

(ii) Angular momentum is the moment of inertia times the angular velocity:

L = Iω

L = (0.121 kg m²) (3 rad/s)

L = 0.363 kg m²/s

(iii) This time, the moment of inertia of the putty is included.

I = 1/3 mr² + Mr²

I = 0.121 kg m² + (0.2 kg) (0.55 m)²

I = 0.1815 kg m²

Angular momentum is conserved:

L = Iω

0.363 kg m² = (0.1815 kg m²) ω

ω = 2 rad/s

Answer:

Work and time needed to the work

Explanation:

Power is defined as follows:

[tex]P=\frac{W}{t}[/tex]

where

P is the power

W is the work done

t is the time needed to do the work

Since the work can also be rewritten as the product between force (F) and displacement (d):

W = F d

The power can be also rewritten as

[tex]W=\frac{Fd}{t}[/tex]

But [tex]\frac{d}{t}[/tex] is equal to the velocity, v; so, power can be rewritten as product between force and velocity:

[tex]P=Fv[/tex]

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. ionic crystal

Explanation:

Crystal lattice is the ordered arrangement of molecules in a crystal. There are different form of arrangement in which molecules of crystals can be put to. When ions in a crystal are arranged in such a way that opposite charges are aligned and are held by an electrostatic force of attraction, an ionic crystal is formed.

Hello There!

Relative density is another word for specific gravity. Relative density is comparing the density of one thing to the density of another. Most of the time, you look at the density of water so we look at the density of an object relative to the density of water.

Multiple reflection causes interference in the sound quality is a TRUE statement.

Explanation:

The reverberation is the cause of interference which is a prolonged sound wave or can also be termed as resonance of sound waves. The sound wave is reflected in an ample amount of time which leads to absorbance of the wave in the medium, therefore, the quality of sound declines in the propagation of the sound wave.

Answer:

(a) 7.59 V

Explanation:

The current in the circuit is 0, so we can ignore the resistor in the circuit.

Capacitors in series have the same charge, so:

Q₁ = Q₂

C₁ V₁ = C₂ V₂

8.25 V₁ = 14.2 V₂

By Kirchoff's voltage law, the sum of the voltage drops equals the source voltage.

V₁ + V₂ = 12

We have two equations and two variables.  Let's solve with substitution.

V₂ = 12 − V₁

8.25 V₁ = 14.2 (12 − V₁)

8.25 V₁ = 170.4 − 14.2 V₁

22.45 V₁ = 170.4

V₁ = 7.59

Answer:

It’s the year 2078, and you’re traveling from Earth to the Moon. To determine how much fuel you need for the rocket ship, you measure your mass upon boarding. When you land on the Moon, your Mass hasn’t changed. Your Weight, however, has changed. You feel lighter because the Force of gravity is lower.

Explanation:

I got this right on Edmentum. Have a great day and I hope this helped!

Your mass remains the same when traveling from Earth to the Moon, but your weight decreases because the Moon's gravity is weaker. Weight is a measure of the force of gravity, which is weaker on the Moon. However, mass is not influenced by gravity and therefore remains constant.

The subject in question relates to the concept of mass and weight and how they are affected by changes in gravity. When traveling from Earth to the Moon as mentioned in your scenario, your mass remains the same, but your weight changes because weight is a measure of the force of gravity on your mass. The value of gravity on Earth is 9.8 m/s² whereas on the Moon it is only 1.67 m/s², which is much less. Therefore, you would feel lighter on the Moon because the gravitational pull is weaker, causing you to weigh less. This change in weight doesn't mean your mass has lowered; mass remains consistent regardless of the gravitational pull.

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An object's momentum is the product of its mass and its velocity:

p = mv

p is its momentum, m is its mass, and v is its velocity.

Given values:

p = -80kg×m/s

m = 8kg

Plug in these values and solve for v:

-80 = 8v

v = -10m/s

Choice D

The velocity is Option D. -10 m/s

v = p/m

v = velocity

p = momentum

m = mass of the object

An object's momentum exists as the product of its mass and its velocity:

p = mv

p is its momentum, m exists its mass, and v stands for its velocity.

Given values:

p = -80kg×m/s

m = 8kg

Plug in these values and solve for v:

-80 = 8v

v = -10m/s

The velocity is Option D. -10 m/s

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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.

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:

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

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:

The velocity

Explanation:

For a mass-spring system, the total mechanical energy is constant during the motion. The total mechanical energy is sum of the elastic potential energy, U, and the kinetic energy, K:

[tex]E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2[/tex]

where

k is the spring constant

x is the displacement

m is the mass

v is the velocity

Since E must remain constant, we see that when x increases, v decreases, and vice-versa. Therefore, when x (the displacement) is at maximum, v (the velocity) is at minimum (more precisely, it is zero).

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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Answer:

B

Explanation:

A. False.  Their mass does not affect when they reach the water.

B. True.  Daisy will reach the water in 1 second.

C. False.  Damon will reach the water in more than 1 second.

D. False.  Daisy reaches the water first.

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:  

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:

Concentric with the wire

Explanation:

The magnetic field around a long, straight current-carrying wire forms concentric lines around the wire itself. The magnitude of the field is given by:

[tex]B=\frac{\mu_0 I}{2\pi r}[/tex]

where

[tex]\mu_0[/tex] is the magnetic permeability

I is the current in the wire

r is the distance from the wire

The direction of the lines of the field can be determined by using the right-hand rule: the thumb of the right hand points in the same direction as the current, and the other fingers (wrapped around the thumb) gives the direction of the field lines.

Answer:

concentric with the wire

Explanation:

Answer:

The Core, Radiation Zone, Convection Zone, Photosphere, Chromosphere, and the Corona.

Explanation:

The Sun has 6 different region which constitutes it completely which are namely from the outermost part to innermost part as follows,

Corona, Chromosphere, Photosphere, Convection Zone, Radiation Zone, Core.

Explanation:

The innermost part is the core of the Sun which has its 25 percent of presence in respect to the radius of the Sun. Next is the Radiation zone comprising the 45 percent of the radius with another 30 percent covered with the convection zone of the Sun.

The atmosphere of the sun contains the outer three parts as Photosphere, Chromosphere and the Corona. The level of heat increases on the way up in atmosphere.

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:

900 kg/m³

Explanation:

There are two forces on the object: weight and buoyancy.

Newton's second law:

∑F = ma

B − W = 0

B = W

Weight is mass times gravity:

W = m₀ g

Mass is density times volume:

W = ρ₀ V₀ g

Buoyancy force is equal to the weight of displaced fluid:

B = ρ V g

Therefore:

ρ V g = ρ₀ V₀ g

ρ V = ρ₀ V₀

ρ₀ = ρ V / V₀

One quarter of the object's volume is above the liquid, which means three quarters of its volume is below the surface.

Given that V = ¾ V₀ and ρ = 1200 kg/m³:

ρ₀ = 1200 (3/4)

ρ₀ = 900 kg/m³

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

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]

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:

4.689 years

Explanation:

Traveling at light speed, it takes about 4.2 years to reach the nearest star from our solar system.

If you could travel at the speed of light, how long would it take to travel from our solar system to the nearest star?

Traveling at the speed of light, it would take approximately 4.2 years to reach the nearest star Alpha Centauri, which is 4.2 light-years away. This is due to the distance light needs to travel to cover the expanse between our solar system and the star.

Answer:

the correct answer is ferromagnetic.

The substance which can get easily magnetized is a ferromagnetic substance.

Explanation:

The magnetic properties of a substance classifies any substance into two kinds of substances or materials. These are ferromagnetic substances or the paramagnetic substances.

These two have been classified on the basis of being magnetized. Ferromagnetic substances gets easily magnetized whereas the paramagnetic substances do not get magnetize easily.

Examples of ferromagnetic substances: Iron, Cobalt or Nickel.

Answer:

B) Force = 7.5, Time = 2 is equal to an impulse of 15 units

It totally depends on WHAT the units are.

IF the force is 7.5 Newtons AND the time is 2 seconds, THEN the impulse is 15 newton-seconds or 15 kg-m/sec. (choice-B)

If either of them isn't, then it isn't.