A silver cube with an edge length of 2.28 cm2.28 cm and a gold cube with an edge length of 2.66 cm2.66 cm are both heated to 89.7 ∘C89.7 ∘C and placed in 100.5 mL 100.5 mL of water at 19.3 ∘C19.3 ∘C . What is the final temperature of the water when thermal equilibrium is reached?

To continue testing his hypothesis, Neil should repeat the experiment, but only wait 20 seconds before testing the comb's attractive effects.

In a controlled experiment, all other factors are held constant with the exception of one. One or more other groups are studied with all conditions being the same as the control group and each other except for one variable. Typically, a collection of data is considered to be the control group, which is often the normal or usual state.

Comparing a control group to an experimental group is a popular form of controlled experiment. The factor being examined is the only difference between the two groups' variables.

A controlled experiment has the benefit of making it simpler to determine whether the results are meaningful.

Imagine you want to know if the type of soil influences how long it takes a seed to germinate and you choose to conduct a controlled experiment to find out. Five similar pots might be used, each filled with a different kind of soil, and each with identical bean seeds. The pots could then be placed in a sunny window, watered equally, and the time it takes for the seeds in each pot to sprout could be recorded.

This is a controlled experiment because the only variable that will change is the kind of soil you use. You are in charge of these options.

Here in given case Neil's goal is to find out how quickly charge dissipate in humid air. So he should try his hypothesis by varying wait time.

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If the velocity of the boat is changing, then the boat is changing direction.

option C.

The velocity of a boat can change due to various factors such as;

Additionally, the boat's velocity can change if the boat's pilot applies the brakes or changes the direction of the boat. The boat's velocity can also be influenced by the shape and weight distribution of the boat, the speed of the water, and the presence of other boats and objects in the water.

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Answer:

F = 9800(42667 + 16000)

F = 5.75 × 10⁸N

Explanation:

The steepest angle to which a material can be piled without slumping/sliding downslope is referred to as the angle of repose.

The correct option is D.

The steepest angle of fall or dip in relation to the horizontal plane that a material may be piled to without collapsing is known as the angle of repose, or critical angle of repose, of a granular material. The materials on the slope face is almost ready to slide at this angle.

The design of particle material processing, storing, and conveying systems must take the angle of repose under consideration. The angle of repose is low when the grains are spherical and smooth. Its angle of repose is steep for extremely fine and adhesive materials.

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Answer:

0.5 kg

Explanation:

W = mg

4.9 = m(9.8)

4.9 = 9.8m

4.9/9.8 = m

m = 0.5 kg

Given:

The height through which the box was lifted, h=6 m

The time it took to lift the box, t=3 s

The power dissipated in lifting the box, P=400 W

To find:

The weight of the box.

Explanation:

The power is described as the time rate of transfer of energy.

Thus the power is given by,

Where W is the work done in lifting the box.

The work done is given by,

Where F is the weight of the box.

Thus the power dissipated in lifting the box is given by,

On substituting the known values,

Final answer:

The weight of the box is 200 N

Thus the correct answer is option A.

Answer: A

Explanation:

There is one important fact about magnetic fields. Magnetic fields are always perpendicular to the velocity of the particle, and the force acting on the particle. This is evident in the Lorentz force equation for magnetic fields, which states:

\(F=q(v x B)\)

The cross product between between the velocity and the magentic field forms a force vector that is perpendicular to both the velocity and the field. In our example, the electron is traveling to the left, and the force it feels is upwards. One thing to keep in mind now, is that the Lorentz force equation is for positively charged particles. Therefore, whatever result we obtain for the field, it is actually the opposite since our particle is negatively charged.

Point your thumb in the direction of the velocity, and point your palm in the direction of the force. Your fingers should be pointing towards yourself (the south). This would be correct for positive charges, but it is the opposite for negative charges. The magnetic field points away from your body, which is the north.

a) Angular frequency is  12.75 rad/s b)  The wave number is 33.59m c)

y ( x ,t) = 2.34  x  sin(33.59 x - 12.75t)

Given,

wavelength = λ = 18.7 cm

                   = 0.187 m

amplitude , A = 2.34 cm

v = 0.38 m/s

A) angular frequency = ?

f = v/λ

f = 0.38/1.87 = 2.03

angular frequency ,

ω = 2π f

ω = 2π x 2.03

ω = 12.75 rad/s

B) the wave number,

K = 2π/λ = 33.59m

c) as the wave is propagating in -x direction, the sign is positive between x and t

y ( x ,t) = A sin(k  x - ω t)

y ( x ,t) = 2.34  x  sin(33.59 x - 12.75t)

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Answer:

Nuclear power is presently a sustainable energy source, but could become completely renewable if the source of uranium changed from mined ore to seawater. Since U extracted is continuously replenished through geologic processes, nuclear would become as endless as solar.

Answer:

false

Explanation:

Answer:

a)  a = 0 m / s²

, b)  a = 0 ==> F = 0

, c)   a = - 2 m / s²

,d) v = 4 m/s

Explanation:

a) It is asked to find the acceleration in the interval from 0 to 2s, from the graph we see that in this interval the velocity is constant with a value of 4 me / s, therefore the average eceleration is

         a = (V₂ - V₁) / t

         a = (4 -4) / 2

         a = 0 m / s²

b) Newton's second law establishes a relationship between force and acceleration

        F = m a

  as acceleration is zero

        a = 0 ==> F = 0

c) the acceleration in interval 2 a4 S

          a = (0 - 4) / (4-2) = -4 / 2

          a = - 2 m / s²

The negative sign iniquity the acceleration is slowing the movement

d) the force is

        F = m a

        F = 2 m

e) from the graph we can read the speed of the vehicle for time

        v = 4 m / s

Answer:

Some practical applications for determining the motion of an object are measuring kinetic energy, acceleration, etc.

Explanation:

The average acceleration of the bike is 2.2 m/s²

Acceleration, rate at which velocity changes with time, in terms of both speed and direction.

A point or an object moving in a straight line is accelerated if it speeds up or slows down.

According to the question,

Given, initial velocity, u=3.0m/s and final velocity v=8.5 m/s

Time = 2.5 seconds

If a be the acceleration.

a = \(\frac{v-u}{t}\)

a = \(\frac{8.5 - 3.0}{2.5s}\)

⟹ a=2.2 m/s²

So, The average acceleration of the bike is 2.2 m/s²

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The given statement "in a pitch situation, a vehicle's weight moves to either the right or left of the vehicle" is false because, in a yaw situation, a vehicle weight moves to either the right or left around the center of gravity.

The Society of Automotive Engineers (SAE) describes Vehicle Dynamics as the relationship between the forces exerted on a vehicle and the resulting motion. Three important motions of a vehicle are pitch, yaw, and roll.

Thus, when a vehicle's weight moves either to right or left of the vehicle, it indicates a yaw situation.

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Answer:

7.8 N

Explanation:

Applying,

I = Ft................. Eqaution 1

Where I = Impulse on the egg test dummy, F = Force on the egg test dummy during the time interval, t = time interval

make F the subject of the equation

F = I/t.................. Equation 2

From the question,

Given: T = -0.39 N.s, t = 0.050 s

Substitute these vales into equation 2

F = -0.39/0.050

F = -7.8 N

Hence the force that act on the egg test dummy is 7.8 N

a. To determine the velocity of each object before they collide, we can apply conservation of mechanical energy.

For the 2-kg bob compressed against the spring, the potential energy stored in the spring when compressed is given by:

PE_spring = 0.5 * k * x^2,

where k is the spring constant (50 N/m) and x is the compression distance (0.6 m).

PE_spring = 0.5 * 50 N/m * (0.6 m)^2 = 9 J

The potential energy is converted entirely into kinetic energy before the collision:

KE_bob = PE_spring = 9 J

Using the formula for kinetic energy:

KE = 0.5 * m * v^2,

where m is the mass and v is the velocity, we can solve for the velocity of the 2-kg bob:

9 J = 0.5 * 2 kg * v^2

v^2 = 9 J / 1 kg

v = √(9 m^2/s^2) = 3 m/s

Therefore, the velocity of the 2-kg bob before the collision is 3 m/s.

For the 3-kg block on the incline, we can determine its velocity using the conservation of potential and kinetic energy.

The potential energy at the top of the incline is given by:

PE_top = m * g * h,

where m is the mass (3 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the height (4 m).

PE_top = 3 kg * 9.8 m/s^2 * 4 m = 117.6 J

The potential energy is converted into kinetic energy:

KE_block = PE_top = 117.6 J

Using the formula for kinetic energy, we can solve for the velocity of the 3-kg block:

117.6 J = 0.5 * 3 kg * v^2

v^2 = 117.6 J / 1.5 kg

v = √(78.4 m^2/s^2) ≈ 8.85 m/s

Therefore, the velocity of the 3-kg block before the collision is approximately 8.85 m/s.

b. If the collision between the objects is elastic, the total momentum before the collision is equal to the total momentum after the collision.

Total momentum before the collision:

P_before = m1 * v1 + m2 * v2,

where m1 and m2 are the masses, and v1 and v2 are the velocities.

P_before = (2 kg * 3 m/s) + (3 kg * 8.85 m/s)

P_before ≈ 36.55 kg·m/s

Since the collision is elastic, the total momentum after the collision remains the same.

Total momentum after the collision:

P_after = (2 kg * v1') + (3 kg * v2'),

where v1' and v2' are the velocities after the collision.

We need to solve this equation for v1' and v2'. More information is required about the nature of the collision (head-on or at an angle) to determine the specific velocities after the collision.

c. To determine how much the spring will be compressed by the object(s) after the collision, we need to consider the conservation of mechanical energy.

The total mechanical energy after the collision is equal to the sum of potential and kinetic energy:

Total Energy_after = PE_spring + KE_bob,

where PE_spring is the potential energy stored in the spring and KE_bob is the kinetic energy of the 2-kg

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Answer:

Do you have a list of all the energies?

Bomb exploding would use chemical reaction (ammonium nitrate for ex), then thermal energy from heat generated, then kinetic energy from the blast overpressure/schockwave.

Answer:

idek to be honest

Explanation:

Riley is doing an experiment working with friction. Increasing surface area and aerodynamic design is used to perform the task.

Friction can cause things to slow down and cease moving if they are stationary. More objects would slide around in a frictionless world, clothes and shoes would be difficult to keep on, and it would be extremely difficult for people or cars to move or change direction. Friction is considered a necessary evil because it is both useful and destructive. Friction enables us to move, write, hold objects, and raise them. As a result, it is required for our survival. Many vital processes cannot take place without friction. The frictional force is described as the force created when two surfaces slide against each other.

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Answer:

alpha particles, beta particles, and gamma rays.

Three types of radiation that are produced during radioactivity are Alpha radiation, Beta radiation, Gamma radiation.

Alpha radiation: Alpha particles are helium nuclei consisting of two protons and two neutrons. They are positively charged and have low penetration power. Alpha radiation can be stopped by a sheet of paper or a few centimeters of air. Beta radiation: Beta particles are either high-energy electrons or positrons. They are negatively or positively charged, respectively. Beta particles have higher penetration power than alpha particles and can be stopped by a few millimeters of aluminum or plastic. Gamma radiation: Gamma rays are electromagnetic radiation similar to X-rays but with higher energy. They have no charge and are highly penetrating. Gamma rays require thicker shielding, such as several centimeters of lead or concrete, to be effectively absorbed.

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Example of an elastic product: Smartphone

Explanation: A smartphone is an example of an elastic product. When the price of smartphones decreases, consumers tend to buy more of them, and when the price increases, consumers tend to buy fewer.

Example of an inelastic product: Prescription medication

Explanation: Prescription medication is an example of an inelastic product. Inelastic goods are those for which changes in price have little impact on the quantity demanded.

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Answer:

What is an electromagnetic wave

Explanation:

Electromagnetic radiation is also more commonly known as light, light travels in waves- and light travels at the same speed as electromagnetic waves. :)

In a loop traverse the sum of the interior angles should be equal to 12, if it has 8 stations.

Traverse Surveying is a popular surveying method.

Surveying is basically of two types:

The errors in the surveying can be found out by angles induced in transverse.

The sum of the measured internal angles should be equal to (2N-4), where N=number of sides of the traverse.

Number of stations = N = 8

Sum of the interior angles = (2N - 4)

Sum = (2*8 - 4)

Sum = 12

The sum of the interior angles should be equal to 12.

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In the metric system, each millimeter increment is equal to 1/10th of a centimeter.

The metric system is a system of units used to measure length, mass, time, and other physical quantities. The base unit of length in the metric system is the meter, and smaller units of length, such as the millimeter, are defined as fractions of the meter.

One millimeter is equal to 1/10 of a centimeter, which is equal to 0.1 cm. This relationship is based on the fact that there are 10 millimeters in one centimeter. In other words, 1 millimeter is one-tenth of a centimeter.

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The photoelectric effect is a phenomenon in which electrons are emitted from a metal surface when it is exposed to light. This effect was first observed by Heinrich Hertz in 1887.

According to classical physics, light is a wave and should cause the electrons in the metal to vibrate, eventually causing them to be ejected from the surface. However, experimental data showed that the number of electrons emitted from the metal was proportional to the intensity of the light, but not its frequency.

Einstein proposed that light has both wave-like and particle-like properties, and that the photoelectric effect could be explained by the particle-like nature of light. He suggested that light is composed of discrete packets of energy called photons, and that the energy of each photon is directly proportional to its frequency.

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Cold water has a higher density than hot water. When the two are combined with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and resulting in purple water.

Result. When you put your hands in the medium-temperature water, the hand that has been in the cold water feels warmer, while the hand that has been in the warm water feels cold, despite the fact that they are both feeling water that is the same temperature.

The density of water is commonly measured in grams per milliliter (1 g/ml) or grams per cubic centimeter (1 g/cm3). Actually, the exact density of water is 0.9998395 g/ml at 4.0° Celsius (39.2° Fahrenheit), not 1 g/ml.

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Answer:

1. Battery

2. Copper wire

3. Nail or piece of metal (zinc, iron, or steel).

Answer:

magnet coppers wire and piece of metals

The work input required is 180 J.

The formula gives the work input:

Work input = Force x Distance

In this instance, a force of 20 N is used, and 5 m is moved. As a result, the force's work is:

Work done by force = 20 N x 5 m = 100 J

A 400 N weight can be moved by the machine 20 cm (or 0.2 m) away.

Using the following formula, we can estimate the work performed by the machine:

Work done by machine = Load x Distance moved by the load

Work done by machine = 400 N x 0.2 m = 80 J

As a result, the amount of work needed to move the load with the machine is:

Work input = Work done by force + Work done by machine

Work input = 100 J + 80 J = 180 J

Therefore, the work input required is 180 J.

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Answer: Quantum is really just an amount of any physical entity involved in an interaction.

Explanation: