What is the resultant acceleration?

In phase for constructive interference and out of phase for destructive

Answer:

= 10 g

Explanation:

Half life is the time taken by a radioactive substance to decay by half of the original mass or initial amount.

Therefore, to get the new mass after decay;

New mass = Original mass × (1/2)^n ; where n is the number of half lives.

n = 60 seconds/20 seconds

  = 3

Therefore;

New mass = 80 g × (1/2)^3

                   = 80 g × 1/8

                   = 10 g

Answer:

2nd statement would be the right answer

Answer: Time and space depend on reference frames, but the speed of light does not.

Explanation: According to Einstein Space and Time are directly related as the way we sense them, in his words space and time is like a fabric in which we cannot affect one without affecting the other as we interact with it, time can be stretched and squeezed depending on your inertial frame of reference (constant speed and mass). However light can travel thru the fabric of space and time and it does not get affected by any reference keeping always the same speed.

Mechanical Advantage = (output force) / (input force)

Mechanical Advantage = (1300 N) / (50 N)

Mechanical Advantage = 26

The mechanical advantage of pulley is that with less applied force we can get large amount of work.

To find the answer, we need to know about the pulley system.

A pulley system is a wheel on an axle or shaft which is designed to support the movement and change the direction of a taut cable or belt, or transfer the power between the shaft and cable or belt.

In a pulley system, we get a huge amount of force from a less amount of applied force.

Thus, we can conclude that the mechanical advantage of pulley is that with less applied force we can get large amount of work.

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Answer:

= 60.16 cm/s or 0.6 m/s

Explanation:

Using the formula for collision;

M1U1 + M2U2 = M1V1 + M2V2

Therefore;

(225 kg)•(98 cm/s) + (198 kg)•(28 m/s) = (225 kg)•v + (198 kg)•(71 cm/s)

22050 kg•cm/s + 5544 kg•cm/s = (225 kg)•v + 14058 kg•cm/s

13536 kg•cm/s = (225 kg)•v

v = 60.16 cm/s

Therefore; the post collision velocity of the 225 kg car is 60.16 cm/s

Answer:

= 22.5 m/s

Explanation:

The acceleration of a moving body is calculated by the formula;

a = (v-u)/t

Where; a is the acceleration of the body

v is the final velocity of the body

u is the initial velocity of the body and

t is the time taken

In this case;

u = 15 m/s

a = 2.5 m/s²

t = 3 seconds

2.5 m/s² = ( v- 15 m/s)/3 seconds

2.5 × 3 = v - 15

7.5 = v - 15

v = 7.5 + 15

  = 22.5 m/s

Answer:The property that describes the amount of energy that flows past a given area per unit of time is called energy flux, denoted by S1. It can be calculated by dividing the energy by the area A and the time interval Δ t. The formula for energy flux is S = Energy passing area A in time Δ t A Δ t = u c = ϵ 0 c E 2 = 1 μ 0 E B1. In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section2.

Explanation:

it causes light to slow and refract very little

Answer:

it causes light to slow and refract very little

Explanation:

its on my test

Answer:

[tex]4.38\cdot 10^{13}[/tex] electrons

Explanation:

The net charge on the sphere is equal to:

[tex]Q=-7\cdot 10^{-6}C[/tex]

This charge is made up of N electrons. Each electron carries a charge of

[tex]q=-1.6\cdot 10^{-19}C[/tex]

So the total charge is just the number of electrons times the charge of each electron:

[tex]Q=Nq[/tex]

And solving the equation for N, we find the number of electrons:

[tex]N=\frac{Q}{q}=\frac{-7\cdot 10^{-6}C}{-1.6\cdot 10^{-19} C}=4.38\cdot 10^{13}[/tex]

Answer:

There is a net force towards the center of the circle that causes the yo-yo to seek the center.

Circular Motion Qualities:

-Constant speed

-Accelerating

-Velocity is changing constantly.

Centripetal acceleration perpendicular to the motion causes the object to change direction

a_c=v^2/r

Tangential acceleration in the direction of the motion causes and increase or decrease in speed.

Tension in the string towards the center provides the centripetal force in a a yo-yo swinging around a person's head.

Centripetal force is the force that keeps an object moving in a circular path. In the case of a yo-yo swung around a person's head, the centripetal force is provided by the tension in the string acting towards the center of the circle. This force allows the yo-yo to maintain its circular motion.

Answer:

-4.0 m/s^2

Explanation:

Acceleration is defined as the rate of change in velocity:

[tex]a=\frac{v-u}{t}[/tex]

where

v is the final velocity

u is the final velocity

t is the time elapsed

For the object in this problem,

u = 65 m/s

v = 25 m/s

t = 10 s

So the acceleration is

[tex]a=\frac{25 m/s-65 m/s}{10 s}=-4.0 m/s^2[/tex]

The negative sign tells that the acceleration is opposite (=west) to the velocity (which is towards east).

Answer:

A

Explanation:

I’m gay

The nucleus has most of the atomic mass in an atom. The nucleus is made up of protons and neutrons.

The nucleus of an atom is located at its center and contains most of its mass. The correct answer is C.

It is composed of protons and neutrons, which are collectively known as nucleons. Protons have a positive charge, while neutrons have no charge. Electrons, on the other hand, are negatively charged particles that orbit the nucleus in energy levels or shells.

Although electrons are much lighter than protons and neutrons, they occupy a larger volume around the nucleus due to their lower mass. The mass of an electron is approximately 1/1836th the mass of a proton or neutron.

Therefore, when considering the total mass of an atom, the mass of the electrons is relatively insignificant compared to the mass of the nucleus, which is primarily composed of protons and neutrons. The correct answer is C.

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Answer:

The answer is C.

Explanation:

I guessed and it was right

Answer:

Work done by the gravity, W = 102 J

Explanation:

It is given that,

Mass of the backpack, m = 8 kg

It is dropped from the height of, h = 1.3 m

We have to find the work done by the gravity as the back pack fall. Work done by the gravity is given by the product of force and distance covered by an object. Mathematically, it is given by :

W = F × d

∵ F = m g

⇒ W = mg h

[tex]W=8\ kg\times 9.8\ m/s^2\times 1.3\ m[/tex]

W = 101.92 Joules

or

W = 102 Joules

So, the work done by the gravity is 102 J. Hence, this is the required solution.

A shadow forms on the side of an object that faces away from the sun. The length of shadows changes as Earth rotates. In the morning, the sun is low in the eastern sky and shadows are long. As time passes in the morning, the sun seems to move higher in the sky.

The size of the object changes with change in the position of the light source.The length of the shadow of the object decreases as the sun position changes from down to top in the sky.

Sunlight has the sun rays. This rays travel to the earth. When the sun rays reach to earth they hit the object comes in his way. If the sun rays hit the opaque body ( a body that absorb some light when light fall on it) the light can not pass through them and the shadow appears.

The shape of a object determine the shape of the shadow made by him but the size of the object does not depends on the size of the object.

The size of the object changes with change in the position of the light source.The shadow appears in the opposite direction from where the sunlight falls on body.

At the outdoor, when there is sun in the sky, the size of the shadow is different at different sun position on the sky.

Hence the length of the shadow of the object decreases as the sun position changes from down to top in the sky.

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Answer: Multiply Both Volume And Density

Explanation: Multiply the volume and density together. Multiply your two numbers together, and you'll know the mass of your object.Keep track of the units as you do this, and you'll see that you end up with units of mass (kilograms or grams).

For this case we have by definition, Newton's second law of motion states that the force is directly proportional to the mass and to the acceleration of a body. That is to say:

[tex]F = m * a[/tex]

Where:

F: It's the strength

m: It's the mass

a: It's the acceleration

ANswer:

[tex]F = m * a[/tex]

Answer:

Friction

Explanation:

Friction is a force that opposes the movement of an object's relative motion. Friction always goes against the attempted movement of the object  when they are in contact. In other words, it is a force that prevents objects from sliding past each other.

The answer is friction.

I took the test and got it right.

I believe the answer is B

Answer:

B

Explanation:

Because its just b trust me

Answer:

The angle of reflection is the angle the reflected rays make with a perpendicular line to the reflecting surface.  

Explanation:

Reflection It is the change of direction suffered by a luminous ray when hitting the surface of an object. The angle of reflection is that which is formed by the reflected ray and the normal vector to the study surface

Answer:

Reflected rays make with a perpendicular line

Answer:

Pitch is the listener's perception of the frequency of sound, but it does affect the speed.

Explanation:

Depending on the frequency at which the sound waves that produce them vibrate, sounds have a higher or lower pitch.

A low frequency, such as 55 Hz, is heard as a low pitch and a high frequency, such as 880 hertz [Hz; cycles per second], as a high pitch.

In frequency, hertz units are used. The pitch of a sound wave increases with the speed of oscillation.

Pitch and sound frequency are connected. The frequency increases as the pitch rise. The length of the vibrating item affects the frequency and pitch of the vibration.

For instance, a shorter string vibrates more quickly than a longer string, producing a greater frequency and pitch.

Therefore, the pitch is related to in terms of sound The higher the pitch of the sound, the higher the frequency, and vice versa, hence they are directly correlated.

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Answer:

The sun rotates more slowly at its poles.

Answer:

The sun rotates more slowly at its poles.

Answer: Chromosphere hope this helps :)

Answer:

When the temperature and pressure of a rock undergoing metamorphism changes. the composition of water allows materials to move more easily, the presence of fluids makes metamorphism more easy.he fluid changes also.

Explanation:

Answer:

It can have elevated concentrations of dissolved substances

Explanation:

Cause I happened to know

can be used to determines the expression for magnetic field strength of a current element

The Biot-Savart law is important for calculating magnetic fields from current loops but can be complex and time-consuming. It requires the use of cross-products and integration along the current-carrying wire. When symmetry exists, Ampère's law might offer a simpler solution.

One advantage of the Biot-Savart law is its ability to calculate the magnetic field produced by any current loop configuration, offering versatility in physics problems. A disadvantage is that it can be complex and time-consuming, particularly when dealing with intricate geometries where symmetry is lacking. When approaching a problem, if there is symmetry, one may consider Ampère's law as an alternative for simplifying calculations especially when a clear path of integration is present.

To apply the Biot-Savart law, it is necessary to define the current element dI and unit vector r, calculate their cross-product, and integrate this across the length of the current-carrying wire. This allows determination of the magnetic field's magnitude and direction. In specific setups, such as calculating the magnetic field of an infinite wire, the desired precision dictates certain assumptions like treating finite segments as effectively infinite when they align closely with the wire's length.

Overall, the Biot-Savart law provides a powerful tool for understanding how current-carrying wires influence the magnetic fields in their vicinity, which is a foundational concept in electromagnetism.

See the attached picture:

Final answer:

To find the coefficient of kinetic friction, use the formula μk = a - sinθ / cosθ where a is acceleration and θ is the angle of the incline. By substituting the given values (a = 0.70 m/s², θ = 25°), the coefficient of kinetic friction is approximately 0.285.

Explanation:

The coefficient of kinetic friction can be calculated using the formula:

μk = a - sinθ / cosθ, where a = acceleration and θ = angle of incline.

Plugging in the values given (a = 0.70 m/s², θ = 25°), we get μk ≈ 0.285.

Answer:

1.33 m

Explanation:

Tom weighs 600 N and is 2 meters from the pivot.  So his moment is:

τ = Fr

τ = (600 N) (2 m)

τ = 1200 Nm

To balance the see-saw, Jeremy must create an equal and opposite moment.

τ = Fr

1200 Nm = (900 N) r

r = 1.33 m

So Jeremy must sit 1.33 m from the pivot on the other side.

The square root of LC has the dimension of time. Its reciprocal is frequency.

The dimension of under root LC is calculated by taking square root of the multiplication of the dimensions of L (Inductance) and C (Capacitance). Using the dimensions of L as [M][L][T]-2 [I]-2 and C as [M]-1 [L]-2 [T]4 [I]2, the dimension of under root LC is [M]-1/2 [L]-1 [T]2 [I].

The question asks for the dimension of under root LC where L is Inductance and C is Capacitance. Both of these are primary physical quantities where the dimension of L is [M][L][T]-2 [I]-2 and the dimension of C is [M]-1 [L]-2 [T]4 [I]2. To find the dimension for under root LC, we can square root the multiplication of the dimensions of L and C, which means that the dimension of under root LC is [M]-1/2 [L]-1 [T]2 [I].

Here, M stands for mass, L for length, T for Time, and I for Current.

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Answer:

Every electric circuit, regardless of where it is or how large or small it is, has four basic parts: an energy source (AC or DC), a conductor (wire), an electrical load (device), and at least one controller (switch).

Explanation:

Cell (battery)

Wires

Bulb or motor

Answer:

Okay it dropped now what..........................................

Explanation:

Is the rock okay I’m concerned

Answer:

They can use it for when they are dormant in the winter or to grow more sources for storing and creating energy, or they store the energy (this energy would be considered stored energy).