Select all the correct statements that are always true about conductors. a. A conductor in an electric field becomes polarized. b. In electrostatic equilibrium, the electric field inside a conductor should be zero. c. In electrostatic equilibrium, the electric field inside a conductor should be infinite. d. In electrostatic equilibrium, the electric field must point outward from the surface of the conductor. e. In electrostatic equilibrium, the electric field must point inward from the surface of the conductor.

Answer:

24000 kg·m/s

Explanation:

Momentum is Mass x Velocity, so 1200 kg time 20 m/s =  24000 kg-ms/s

The momentum of the car is  24000 Kg•m/s

Momentum is defined as the product of mass and velocity. Mathematically, it can be expressed as:

Momentum = mass × velocity

With the above formula, we can obtain the momentum of the car as follow:

Momentum = mass × velocity

Momentum = 1200 × 20

Momentum of car = 24000 Kg•m/s

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A fox getting its energy from a mouse and a mouse getting its energy from the grass  shows evidence of the carbon cycle

The carbon cycle is a necessary component within the global interchange between living species and the environment.

Through photosynthesis, plants absorb carbon dioxide from the atmosphere and convert it into vitalizing organic matter for consumption by animals; these organisms expend the energy obtained and consequently expel carbon dioxide back up into the air via respiration.

Moreover, when animals meet their demise and decompose, the carbon in their bodies is redeposited into Earth's soil only to eventually be delivered once again to the atmosphere through erosive activities or those generated from volcanoes.

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a) The value of the vector A + B is i + 2j + k and |A + B| is √6 units.

Given:

A = i + j

B = j + k

A + B = i + j + j + k

= i + 2j + k

|A + B| is the magnitude of the vectors A and B

|A + B| = √(1² + 2² + 1²)

= √(1 + 4 +1)

= √6

b) The vector 3A - 2B has the value of 3i + j -2k

Given:

A = i + j

3A = 3i + 3j

B = j + k

2B = 2j + 2k

3A - 2B = 3i + 3j - 2j - 2k

= 3i + j -2k

c) The scalar product of the vector that is A • B is equal to 3 units

The scalar product is calculated as follows:

A • B = i + j • j + k

= 1 + 1 * 1 + 1

= 1 + 1 + 1

= 3 units

d) The vector product or A x B is i - j + k and the magnitude of the same is √3 units.

                   i          j        k

A                 1          1        0

B                 0         1         1

The vector product is calculated as follows:

A x B = (1 * 1 - 1 * 0) i + (0 * 0 - 1 * 0) j + (1 * 1 - 0 * 1) k

= (1 - 0) i + (0 - 1) j + (1 - 0) k

= i - j + k

| A x B | = √(1² + (-1)² + 1²

= √1 + 1 + 1

= √3 units

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Answer:

The angular separation is  \(k = 0.8594^o\)

Explanation:

From the question we are told that

   The  wavelength of the light is \(\lambda = 600 \ nm = 600*10^{-9} \ m\)

   The  distance of separation between the slit is  \(d = 0.080 \ mm = 0.080 *10^{-3} \ m\)

    The distance from the screen is

Generally the condition for  constructive interference is mathematically represented as

        \(d \ sin(\theta) = n \lambda\)

=>    \(\theta = sin ^{-1} [ \frac{n * \lambda }{ d } ]\)

    here \(\theta\) is the angular separation between the central maxima and one side of the first order maxima

given that we are considering the first order of maxima n =  1  

        =>   \(\theta = sin ^{-1} [ \frac{1 * 600*10^{-9} }{ 2.0 } ]\)

        =>    \(\theta = sin ^{-1} [ 0.0075 ]\)

        =>   \(\theta = 0.4297^o\)

So the angular separation of the two first order maxima  is  

     \(k = 2 * \theta\)

     \(k = 2 * 0.4297\)

      \(k = 0.8594^o\)

The  equation describes the sum of the vectors plotted below is: \(\vec{r} = 4 \vec{x}+2 \vec{y}\)

A physical quantity that has both directions and magnitude is referred to as a vector quantity.

A lowercase letter with a "hat" circumflex, such as "û," is used to denote a vector with a magnitude equal to one. This type of vector is known as a unit vector.

According to the final position of the vector as shown in the figure, The final x co-ordinate is 4 and  the final y co-ordinate is 2.

the  equation describes the sum of the vectors plotted below is: \(\vec{r} = 4 \vec{x}+2 \vec{y}\)

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Answer:

Hello your question is incomplete attached below is the missing part of the question

In this problem, you will practice applying this formula to several situations involving angular acceleration. In all of these situations, two objects of masses m1 and m2 are attached to a seesaw. The seesaw is made of a bar that has length l and is pivoted so that it is free to rotate in the vertical plane without friction. Assume that the pivot is attached tot he center of the bar.

You are to find the angular acceleration of the seesaw when it is set in motion from the horizontal position. In all cases, assume that m1>m2.I

answer : part A = 2*[(M1 - M2)/(M1 + M2)]*g/L

              part A = attached below

Explanation:

Part A :

Assuming that mass of swing is negligible

α = T/I

where ; T = torque, I = inertia,

hence T =  L/2*9*(M1 - M2)

also;  I = \(M1*(L/2)^2 + M2*(L/2)^2\)=  ( M1 + M2) * (L/2)^2

Finally the magnitude of the angular acceleration α

α = 2*[(M1 - M2)/(M1 + M2)]*g/L

Part B attached below

People use drugs for many reasons: they want to feel good, stop feeling bad, or perform better in school or at work, or they are curious because others are doing it and they want to fit in. The last reason is very common among teens.Drugs excite the parts of the brain that make you feel good. But after you take a drug for a while, the feel-good parts of your brain get used to it. Then you need to take more of the drug to get the same good feeling. Soon, your brain and body must have the drug just to feel normal. You feel sick, awful, anxious, and irritable without the drug. You no longer have the good feelings that you had when you first used the drug. This is true if you use illegal drugs or if you misuse prescription drugs. Misuse includes taking a drug differently than how your doctor tells you to (taking more or crushing pills to "shoot up" or snort), taking someone else’s prescription, or taking it just to get “high.”

A cell of inter resistance of 0.5 ohm is connected to coil of resistance 4 ohm and 8 ohm joined in parallel.If there is current of 2A in 8 ohm, the electromotive force (emf) of the cell is approximately 14.5 volts.

To find the emf of the cell, we can apply Ohm's Law and Kirchhoff's laws to analyze the circuit.

Given:

Resistance of the coil, R1 = 4 ohm

Resistance of the other resistor, R2 = 8 ohm

Current passing through the 8-ohm resistor, I = 2A

First, let's analyze the parallel combination of the 4-ohm and 8-ohm resistors.

The total resistance of two resistors in parallel can be calculated using the formula:

1/Rp = 1/R1 + 1/R2

Substituting the given values, we have:

1/Rp = 1/4 + 1/8

1/Rp = 2/8 + 1/8

1/Rp = 3/8

Rp = 8/3 ohm

Now, let's consider the total resistance in the circuit, which includes the internal resistance of the cell (0.5 ohm) and the parallel combination of the resistors (8/3 ohm).

R_total = R_internal + Rp

R_total = 0.5 + 8/3

R_total = 1.833 ohm

Now, we can find the emf of the cell using Ohm's Law:

emf = I * R_total

emf = 2 * 1.833

emf ≈ 3.667 volts

Therefore, the emf of the cell is approximately 3.667 volts.

However, it is worth noting that the given current of 2A passing through the 8-ohm resistor does not affect the emf calculation since the emf of the cell is independent of the current in the circuit.

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Answer:

im pretty sure the answer is C

Answer:

equator

Explanation:

in south & north pole you could have 20+ hours daylight or night, everyday!

From the information given, the image is three times taller. This means that

magnification = image height/object height = 3

magnification = image distance/o

The period of the ball in simple harmonic motion is 0.634 s.

Period can be defined as the time ( in seconds) taken for a body to complete one oscillation.

To calculate the period of the ball in SHM, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The period of the ball in simple harmonic motion is 0.634 s.  

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Answer:

speed

Explanation:

speed

The right answer is A). The wavelength of the wave likewise reduces when the frequency of the light wave falls as it moves from a rarer to a denser medium because the frequency of light waves remains constant in all media.

Light is bent as it passes through a different medium because of the speed difference. Light waves are bent at different angles because they are slowed down at varying rates.

If light is initially absorbed by electrons in a substance to elevate their energy level, this can affect the wavelength of the light.

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Hi there!

We can use a summation of torques to find the unknown mass:

∑F = R · F (distance from fulcrum × force in this instance)

Since there are masses on both sides, we can set their torques equal to each other since they must balance:

∑F = 0

R₁F₁ = R₂F₂

F = weight of mass, or Mg

50(g)(50 - 20) = M(g)(70 - 50)

Cancel out the g's, or acceleration due to gravity:

50(30) = M(20)

Solve:

1500 = M(20)

1500/20 = M = 75 grams

Explanation:

6) newton

7) f =ma = 15*15 = 225N

8) a= 100/20 = 5ms^-2

Answer:

6 newton

7) f =ma = 15*15 = 225N

8) a= 100/20 = 5ms^-2

Explanation:

this is right pls mark as brainliest

The dependent, independent, and controlled variables​ are as follows:

1. Dependent - The effect of lime urea table salt and compost on the soil

2. Independent - The soil on which the elements are incorporated.

3. Controlled variable - The height of the plants.

The dependent variable is that which is tested in the experiment and in this experiment, Chandani is testing the effect of lime, urea, table salt, and compost on the soil.

The independent variable is the altered element in the experiment and for this experiment, this is the soil that receives different additives. Finally, the controlled variable is that which remains constant and that is the height of each plant that the researcher checks.

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Answer:

Nonrenewable Resources

Answer:

fossil fuels

Explanation:

Changing the green sum of forces arrow involves manipulating applied forces, frictional forces, and normal forces, allowing for adjustments in magnitude and direction through various means.

To change the green sum of forces arrow, you can employ the following three strategies:

Adjusting Applied Forces: By modifying the magnitude or direction of the applied forces, you can alter the green sum of forces arrow. If the applied forces are increased or directed in a different way, the green sum of forces arrow will change accordingly. For instance, increasing the magnitude of a pushing force will result in a larger green sum of forces arrow in that direction.

Modifying Frictional Forces: Frictional forces play a crucial role in determining the green sum of forces. By changing the coefficient of friction or applying lubricants, you can affect the magnitude of frictional forces acting on an object. Reducing friction will decrease the green sum of forces arrow, while increasing friction will have the opposite effect.

Varying Normal Forces: The green sum of forces arrow can be influenced by adjusting the normal forces acting on an object. Normal forces are perpendicular to the surface and counteract the weight of an object. By changing the angle or surface on which an object rests, you can modify the normal forces. This alteration will subsequently impact the green sum of forces arrow.

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The change in velocity Δv for an object that accelerates at a constant rate a during a time interval Δt is given by the equation:

On the other hand, if a force F acts on an object with mass m, the object will be accelerated by the force at a rate a given by:

Replace F=150N and m=4kg to find the acceleration of the bowling ball:

Next, replace a=37.5 m/s^2 and Δt=0.2s to find the change in velocity of the bowling ball:

Therefore, the change in velocity is 7.5m/s.

The acceleration of the falling object with a mass of 2.55 kg that encounters 4.0 N of air resistance is 1.57m/s².

Acceleration is change of velocity with respect to time (can include deceleration or changing direction).

The acceleration of a body can be calculated by using the following expression;

a = F/m

Where;

According to this question, a mass of 2.55 kg encounters 4.0 N of air resistance. The acceleration of the object can be calculated as follows:

a = 4N ÷ 2.55kg

a = 1.57m/s²

Therefore, 1.57m/s² is the acceleration of the object.

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Answer: 520 nm; 5.77 × 1014 Hz; 3.82 × 10−19 J

Using Coulomb's law:

Where:

Therefore:

Solve for q1:

The object that is furthest away from earth is the cluster of galaxies. Option B

The solar system is arrangement of arrangement of the sun and the planets. The sun lies at the center of the solar system. This is known as the heliocentric model. The planets surround the sun in orbits.

Now as we move across the earth going far deeper into the outer space, we would find out that the object that is furthest away from earth is the cluster of galaxies. Option B

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The mass of the object is approximately 0.457 kg.

The mass of the object attached to the trolley can be calculated using the principle of conservation of momentum. Since the two trolleys couple together and move as a single system after the collision, the total momentum before and after the collision should be the same. Given the mass of one trolley is 0.80 kg and the initial speed is 1.1 m/s, the momentum before the collision is 0.80 kg * 1.1 m/s = 0.88 kg·m/s. After the collision, the total mass is the sum of the two trolleys, and the final speed is 0.70 m/s.

Using the momentum equation, the mass of the object can be calculated as follows:

Total momentum before collision = Total momentum after collision

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

Solving for the mass of the object, we get:

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

0.88 kg·m/s = 0.56 kg + 0.70 kg * mass of the object

0.88 kg·m/s - 0.56 kg = 0.70 kg * mass of the object

0.32 kg = 0.70 kg * mass of the object

Dividing both sides by 0.70 kg, we find:

mass of the object = 0.32 kg / 0.70 kg = 0.457 kg

The two trolleys collide and couple together, the total momentum before the collision is equal to the total momentum after the collision according to the principle of conservation of momentum.

The momentum of an object is defined as the product of its mass and velocity. In this case, the mass of one trolley is known (0.80 kg) and the initial speed is given (1.1 m/s), allowing us to calculate the momentum before the collision.

After the collision, the two trolleys move together at a new speed (0.70 m/s). By setting the initial momentum equal to the final momentum and solving for the unknown mass of the object, we can find its value.

In the calculation, we subtract the masses of the two trolleys from the total mass in order to isolate the mass of the object.

Dividing the difference in momentum by the product of the known mass and the new speed, we obtain the mass of the object. In this case, the mass of the object is approximately 0.457 kg.

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Answer:

Explanation:

Q1) d) A is not correct; R is correct (sort of) but is not the reason for A.

A vector may be resolved into an infinite number of components.

Breaking a projectile motion into the vertical and horizontal components is the EASIEST way to solve it because acceleration can be assumed to be constant in both directions. Zero for horizontal and g(ravity) in the vertical. However it is not the ONLY way to do it. Other ways are much more complex.

Q2) a) Both A and R are correct; R is the correct explanation of A  (sort of)

A is correct. Speed is constant in uniform circular motion.

R is correct if you call CENTRIPETAL acceleration constant. It is only constant in magnitude. The direction is always changing as the vector always points toward the center of rotation.

Answer In the field of physics, tension is called the force that is exerted by the action of a cable, rope, chain or other similar solid object. ... Since tension is a magnitude of force, it is measured in newtons and is always measured in a direction parallel to the chord on which it is applied.

Explanation:

Answer:

USB-6000

Explanation:

For this strange exercise, you must take into account two fundamental aspects of the data acquisition cards;

* The resolution of the cards, which for a 12-bit card is 2.24mV =2.24 10⁻³V , for which a card of this resolution is sufficient

    In your case, the amplitude is 50 mv, which is why it is much higher than the resolution of the card.

* The sampling rate or the frequency in which the card can acquire the data, the typical frequencies go from 200 Khz to the MHz, in general a card that has more than double the frequency to be measured should be selected.

In this case the frequency of your wave is

           f = 1 / T

           f = 1/100 10⁻³

            f = 10 Hz

therefore a low frequency card is suitable.

- The third point is the requirement that it has a USB interface, most of the card do not have it

If you check the National Instruments catalog, there are low-cost cards for example: USB-6000 of 12bits and 10KS / s the latter is the samples taken per second