an unlabeled container of radioactive material has an activity of 86 decays/min. four days later the activity is 59 decays/min.

Answer:

42.5J/kgk

Just use the formula

C = Q/m x change in temp

Two point charges of 2.00 μc and -2.00 μc are 0.100 m apart the electric field at the point midway between the two charges: 7.20 x 10⁵ N/C.

The electric field at the point midway between two point charges can be determined by calculating the electric fields produced by each charge and then summing them up as vectors.

In this case, we have two point charges, +2.00 μC and -2.00 μC, separated by a distance of 0.100 m. Since the charges have the same magnitude but opposite signs, the electric fields they produce at the midpoint will have equal magnitudes but point in opposite directions.

The electric field produced by a point charge is given by the equation: E = k × |q| / r²

where E is the electric field, k is the electrostatic constant, |q| is the magnitude of the charge, and r is the distance between the charge and the point where the field is being calculated.

For the midpoint, the distances from each charge are equal, i.e., r = 0.050 m. Therefore, the electric field produced by each charge is:

E₁ = k × |2.00 μC| / (0.050 m)²

E₂ = k × |-2.00 μC| / (0.050 m)²

Substituting the values and considering the opposite directions of the fields, we have: E = E₁ - E₂

Calculating the magnitudes and taking into account the values of k and the charges, we find:

E = (9.0 x 10⁹ N·m²/C²) × (2.00 μC) / (0.050 m)²

E ≈ 7.20 x 10⁵ N/C

Therefore, the electric field at the point midway between the two charges is approximately 7.20 x 10⁵ N/C.

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Answer:

as we know

p=1/f

p=1/-40m

p=  -0.025d

you have written the unit of focal length wrong it is the unit of power

please mark as brainliest plzzzzzzzzzz

Answer:

From Savos point of view, Gadros appear not to be moving

Explanation:

The given parameters are;

The distance between Godric and Savos = A few meters

The location of Godric and Savos = One end of the field

The location pf Peter = The other end pf the field

The speed with which Godric and Savos are moving towards Peter = 4 m/s

Let the positive x-direction be the direction in which Godric and Savos are moving

Therefore;

The speed and direction with which Godric is moving = The speed and direction with which Savos is moving = 4·i m/s

From Savos point of view, the relative speed with which Godric is moving = (The speed and direction in which Godric is moving) - (The speed and direction in which Savos is moving) = 4·i m/s - 4·i m/s = 0 m/s

Therefore, from Savos point of view, the relative speed with which Godric is moving = 0 m/s or Gadros appears stationary or not to moving.

Given information: The average method reports the following unit data for the forming department. Units completed in the forming department are transferred to the painting department. Production cost information for the forming department follows.

Direct materials:
Units completed during the period = 45,000 units
Ending work in process inventory = 5,000 units
Direct materials cost = $202,500

Conversion costs:
Units completed during the period = 45,000 units
Ending work in process inventory = 5,000 units
Conversion cost = $189,000

a. Calculation of equivalent units of production for both direct materials and conversion for the forming department:
Equivalent units of production = Units completed during the period + (Ending work in process inventory * Degree of completion)
Direct materials:
Equivalent units of production = 45,000 + (5,000 * 50%) = 47,500 units

Conversion costs:
Equivalent units of production = 45,000 + (5,000 * 60%) = 48,000 units

b. Calculation of the cost per equivalent unit of production for both direct materials and conversion for the forming department:
Cost per equivalent unit of production = Total cost for the period / Equivalent units of production

Direct materials:
Cost per equivalent unit of production = $202,500 / 47,500 units = $4.26 per unit

Conversion costs:
Cost per equivalent unit of production = $189,000 / 48,000 units = $3.94 per unit

c. Calculation of the cost assigned to the forming department's output using the weighted average method:
Total cost = Cost of units transferred out + Cost of ending work in process inventory
Cost of units transferred out = Number of units transferred out * Cost per equivalent unit of production
Cost of ending work in process inventory = Number of units in ending work in process inventory * Cost per equivalent unit of production

Direct materials:
Cost of units transferred out = 40,000 * $4.26 per unit = $170,400
Cost of ending work in process inventory = 5,000 * $4.26 per unit = $21,300
Total cost = $170,400 + $21,300 = $191,700

Conversion costs:
Cost of units transferred out = 40,000 * $3.94 per unit = $157,600
Cost of ending work in process inventory = 5,000 * $3.94 per unit = $19,700
Total cost = $157,600 + $19,700 = $177,300

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Answer:

the laws of motion is what keeps everything going an back without gravity they couldn't been no us . let them say what they was but newton knows best if they want to come an say newtons discovery changed the world without him we couldn't rest

Answer:

C. sodium combines with chlorine to form sodium chloride

Explanation:

Answer:

C. sodium combines with chlorine to form sodium chloride.

Explanation:

The quantum mechanical model of the atom, each subshell is characterized by a letter designation that corresponds to its value of l. The subshell with l=1 is the p subshell, which can hold a maximum of 6 electrons.

Therefore, the element to which this atom belongs must have its highest-energy valence electrons in the 5p subshell. There are several elements that have their valence electrons in the 5p subshell, including antimony (Sb), tellurium (Te), and iodine (I).

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In this given circuit, there are two resistors, R2 and R3 connected in series with a battery of 12 V as shown below;\(\Delta V = V = 12 V\)Let us first find the total resistance of the circuit.

Using the formula, resistances in series add up to give the total resistance of the circuit\(R_T = R_2 + R_3 = 8\ \Omega + 12\ \Omega = 20\ \Omega\)

Using Ohm's Law; the current through the circuit can be calculated as follows;

\(I_T = \frac{V}{R_T} = \frac{12\ V}{20\ \Omega} = 0.6\ A\)

Thus, the current through each of the resistors, R2 and R3 is the same and it is equal to the total current of the circuit;\(I_1 = I_2 = 0.6\ A\)

The potential difference across each of the two resistors, R2 and R3 is different because of the difference in resistance. Using Ohm's Law, the potential difference across each resistor can be calculated as follows;

\(\Delta V_2 = V_{R_2} = I_2 \cdot R_2 = 0.6\ A \cdot 8\ \Omega = 4.8\ V\)

\(\Delta V_3 = V_{R_3} = I_2 \cdot R_3 = 0.6\ A \cdot 12\ \Omega = 7.2\ V\)

Thus, the potential difference across resistor R2 is 4.8 V and across resistor R3 is 7.2 V.

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Answer:

0.46 m/s (meters/second)

Explanation:

Answer:

who discovered the theory of inertia? = Sir Isaac Newton

Explanation:

what misled Aristotle to conclude that bodies would be in motion only if continuous force was exerted on them--

Aristotle's conclusion was partly influenced by his broader philosophical framework, which emphasized the importance of causation and teleology (the study of purpose or final causes) in understanding the natural world. He believed that motion required an ongoing cause or "mover" to sustain it, and without such a cause, motion would naturally cease.

The Greek mathematician and philosopher Archimedes is credited with discovering the notion of inertia. But Sir Isaac Newton later developed it in greater detail in his laws of motion, which were developed in the 17th century.

Aristotle had erroneous ideas about the presence of violent motion and natural motion, which led to his misconceptions about motion. In contrast to objects on Earth, which required a constant force to maintain motion, heavenly bodies had inherent circular motion, according to his model. For many years, Aristotle's philosophy was widely accepted, but Galileo's experiments and Newton's laws of motion ultimately disproved it. Unless acted upon by an outside force, things will remain at rest or in uniform motion, according to Newton's first law of motion, the law of inertia.

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Half-wave rectified power is obtained by placing a diode in one of the AC power lines.

A diode is an electronic component that allows current to flow in only one direction while blocking it in the opposite direction. By placing a diode in one of the AC power lines, it allows current to flow during half of the AC cycle while blocking it during the other half. This results in half of the waveform being rectified or converted to a unidirectional current.

The rectified output obtained through this arrangement is known as half-wave rectified power. It is commonly used in certain applications where a pulsating DC output is sufficient, such as in some low-power devices or for simple battery charging.

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Answer:

10 m

Explanation:

PE = mgh

m = 50kg

g= 9.8 m/s^2

h=?

so,

4900= 50×9.8× h

50h = 4900/9.8

50h = 500

h = 10 m

According to the problem it takes 3 seconds to reach a speed of 29. 4m/s.

Speed is the rate of change in the position of an object over a given period of time. It is a scalar quantity, meaning it is a magnitude with no direction. Speed is the magnitude of the velocity vector. It is measured in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). Speed is determined by the formula speed = distance/time.

The equation for calculating the time it takes for an object to reach a certain velocity given an initial velocity of zero is t = (vf - vi) / a,where an is the acceleration, vi is the starting velocity, and vf is the final velocity.

In this case, vf = 29.4 m/s, vi = 0 m/s, and a = 9.8 m/s^2.

t = (29.4 - 0) / 9.8

t = 3 seconds

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Rotation refers to the spinning of a planet, moon, or other object on its own axis. The Earth completes one rotation every 24 hours, which is what causes day and night.

Revolution, on the other hand, refers to the movement of an object in orbit around another object. For example, the Earth revolves around the sun, which takes about 365.25 days to complete one revolution. The axis of rotation is an imaginary line that runs through the center of an object and around which it rotates. In the case of the Earth, its axis of rotation is tilted at an angle of 23.5 degrees, which is what causes the changing seasons. An orbit is the path that an object takes as it revolves around another object, like the Earth's orbit around the sun. Finally, a leap year is a year that has an extra day, February 29th, which is added to the calendar to keep it in sync with the Earth's revolution around the sun. This is necessary because the Earth's orbit around the sun is actually slightly longer than 365 days, so the extra day helps to correct for this discrepancy. On a clock, the hour hand will rotate every 23 and 6 hours, or 23/6 For the 23rd and 6th hours of a clock's rotation, we must determine the radians with the hour hand. Completely around the circle with the radius constitutes one revolution. The radius subtends a 2 radian angle at the circle's centre after one complete rotation. We will use the knowledge that 2 radians equal 360 degrees to demonstrate the conversion of 1 radian to degrees.

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The step which ordinary people can take to minimize the effects of earthquakes and volcanoes and prevent the loss of human life is through awareness and warning systems by the appropriate authorities.

This is referred to as the process which involves the sudden shaking of the ground as a result of the passage of seismic waves through Earth's rocks.

Its effect with that of volcanoes can be reduced by creating the necessary awareness and warning systems so that the citizens adopt land use practices and building codes best suited for areas prone to this type of condition.

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Answer:

Power is associated by many people with electricity. Knowing that power is the rate of energy use or energy conversion, what is the expression for electric power? Power transmission lines might come to mind. We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. (See Figure 1(a).) Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?

Explanation:

The greatest amount of heat is released by the process called condensation. Hence, option A is correct.

Condensation is the process in which the gaseous state is converted into liquid state. When the air molecules come in contact with the cooler surface, they form liquid and this process is called a condensation reaction.

In a gaseous state, the molecules are said to be free. When they come closer to form a bond with the nearby molecules to form a liquid, the kinetic energy of gaseous molecules decreases. When kinetic energy decreases, they give their energy as heat. The release of heat energy is called the exothermic process.

Condensation releases the most energy compared to others. Thus, option A is correct.

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13.0 m/s   that's how fast he was going

Explanation:

Given that,

Mass of an object, m = 250 g = 0.25 kg

Spring constant, k = 48 N/m

The amplitude of the oscillation, A = 5.42 cm = 0.0542 m

1. At equilibrium,

ma = kx

Where

a is the acceleration of the object

So,

\(a=\dfrac{kx}{m}\\\\a=\dfrac{48\times 0.0542}{0.25}\\\\a=10.4\ m/s^2\)

2. The maximum speed of the object is :

\(v=A\omega\\\\v=A\sqrt{\dfrac{k}{m}}\\\\v=0.0542\times \sqrt{\dfrac{48}{0.25}}\\\\v=0.75\ m/s\)

Hence, this is the required solution.

The ratio of the cylinder's end-to-end resistance (Re) to the prism's end-to-end resistance (Rp). Therefore, the ratio Re/Rp is 1/(2π).

It can be determined by considering the resistivity and geometry of the two shapes.

For cylinder, the resistance (R) can be calculated using the formula R = (ρ * L) / A, where ρ is resistivity, L is length of cylinder, and A is cross-sectional area.The length ofcylinder (Lcylinder) would be equal to square's side length (r) multiplied by square's side length (r). For prism, the resistance (R) can be calculated using the same formula, with the length of the prism (Lprism) equal to the circumference of the cylinder (2πr).  

By substituting the appropriate values into the resistance formula for the cylinder and the prism, we can determine the ratio Re/Rp.

The ratio Re/Rp = (ρ * Lcylinder) / (ρ * Lprism) = (r^2 * r) / (r^2 * 2πr) = 1 / (2π).

Therefore, the ratio Re/Rp is 1/(2π).

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if u throw a ball straight up its speed decreases .

the shape of the ball would be curved

velocity : top is zero

No, the co-efficient of friction cannot have a value such that a skier would be able to slide uphill at a constant velocity.

The co-efficient of friction represents the amount of resistance to motion between two surfaces in contact. When moving uphill, the force of gravity is acting against the skier's motion, which increases the frictional force. In order to maintain a constant velocity, the force of the skier pushing forward would have to match the force of friction, but with an increased frictional force, it would require a greater force from the skier to maintain that velocity. Therefore, it is not possible for a skier to slide uphill at a constant velocity due to the increased co-efficient of friction.
The answer is no, the coefficient of friction cannot have a value that would allow a skier to slide uphill at a constant velocity. The coefficient of friction is a measure of the resistance between two surfaces, in this case, the skis and the snow. When sliding uphill, the skier must overcome both friction and the gravitational force pulling them downhill. To slide uphill at a constant velocity, an external force would need to be applied, such as pushing or propelling themselves uphill. The coefficient of friction cannot be adjusted to overcome the force of gravity without an external force being applied.

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The input work of a machine with an efficiency of 20% and an output work of 140 J is 28 J

Input work is the work done on a machine as the input force acts through the input distance.

To calculate the input work of the machine, we use the formula below.

Formula:

Where:

Make Wi the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the input work of the machine is 28 J.

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Answer:

Joule or kilowatt/hour