A sample of cobalt-60 has an activity of 2000 Bq. What will the activity be after 10 years? Cobalt-60 has a half life of 5 years.

Answer:

Actually the object with more mass with the same acceleration will need more force added on to it because it has more mass and more than likely more weight so will need that extra force to push it down the object with the least mass will go faster with the same force added

Explanation:

According to conservation of energy, the energy of interacting bodies in a closed system remains constant. The total energy of an isolated system remains constant; it is said to be conserved over a period of time.

Elastic energy is the mechanical implicit energy stored in the configuration of a material or physical system as it's subjected to elastic distortion by work performed upon it. Elastic energy occurs when objects are impermanently compressed, stretched or generally misshaped in any manner.

The mechanical energy is never lost forever , rather it gets converted to thermal energy because of the friction .

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Answer:   1800 i think if my math is correct

Explanation:

Answer:

B

endothermic: heat taking in

exothermic: heat given out

Answer:

I thin that the answer is d because the energy goes high and then it goes down a bit

Explanation:

Answer:

water vapor is a type of gas

Explanation:

all gas are in air state of form

hope this helps

Answer:

chemical potential energy

Explanation:

When the sun's radiant energy falls on Earth's oceans, it causes water to change state by evaporating. The form of energy water vapor have is chemical potential energy. when heat energy of sun falls on water surface, its state change from liquid to gas. This gas rises above in the form of water vapor. Its a chemical change. If this vapor get condense/ cool, it will turn into liquid again. We can say that vapor has potential to transform into water again. Thus, the energy stored in water vapor is called chemical potential energy.

the electric field is more than the threshold value and the capacitor will experience dielectric breakdown.

1. Given values are,
side length of metal plates, a = 3 cm and b = 6 cm
distance between the plates, d = 2.36 cm
voltage, V = 110 V
dielectric constant of water, k = 80.4
dielectric constant of new material, k2 = 3.75
a) To calculate the capacitance of capacitor, the formula is, C=εA/d  ……………… (1)
where A = area of plate, ε = permittivity, and d = separation distance between two plates.
We know that the permittivity of vacuum is given as, ε0 = 8.854 x 10^-12 F/m
The capacitance of capacitor can be expressed as,
C1 = ε0 (kA/d) …………….. (2)
where, ε0 = permittivity of vacuum, k = dielectric constant and A = area of plate.
Substituting the given values in equation (2),
C1 = 8.854 x 10^-12 x 80.4 x (0.03 x 0.06)/0.0236
C1 = 0.000132 F
Therefore, the capacitance of capacitor is 0.000132 F.

b) To calculate the new capacitance, the formula is given as,
C2 = k2ε0A/d ……………… (3)
where k2 is the dielectric constant of new material.
Substituting the given values in equation (3),
C2 = 3.75 x 8.854 x 10^-12 x (0.03 x 0.06)/0.0236
C2 = 0.000263 F
Therefore, the new capacitance is 0.000263 F.

c) The new voltage can be calculated as,
V2 = V1(C1/C2) …………… (4)
Substituting the given values in equation (4),
V2 = 110 (0.000132/0.000263)
V2 = 55 V
Therefore, the new voltage is 55 V.

d) The charge on each plate is given as,
Q = CV ………….. (5)
Substituting the given values in equation (5),
Q = 0.000132 x 110
Q = 0.0145 C
Therefore, the charge on each plate is 0.0145 C.

2. Given values are,
capacitance, C = 3.23 µF
area of plate, A = 6.35 mm^2
separation distance between two plates, d = ?
new capacitance, C2 = 5.63 mF
new dielectric constant, k2 = ?
voltage, V = 110 V
electric field between two plates, E = 8.99 x 10^4 N/C
working voltage, Vw = 63 V

a) The separation distance between two plates can be calculated as,
C1/C2 = d2/d1  …………….. (6)
where d1 and d2 are the initial and final separation distance, respectively.
Substituting the given values in equation (6),
3.23 x 10^-6/5.63 x 10^-3 = d2/d1
d2 = 5.63 x 10^-3 x (d1/3.23 x 10^-6)
Area of plate, A = 6.35 mm^2 = 6.35 x 10^-6 m^2
The capacitance can be expressed as,
C = εA/d
d = εA/C
where ε = permittivity of dielectric material.
Therefore, substituting the given values in above equation,
d1 = ε x 6.35 x 10^-6/3.23 x 10^-6
d1 = 12.50 ε
Substituting the value of d1 in equation (6),
5.63 x 10^-3 = d2/12.50 ε
d2 = 70.38 ε
The separation distance between two plates is 70.38 ε.

b) The new dielectric constant can be calculated as,
C2 = k2ε0A/d2
k2 = C2d2/ε0A
Substituting the given values in above equation,
k2 = 5.63 x 10^-3 x 70.38 ε/(8.854 x 10^-12 x 6.35 x 10^-6)
k2 = 3.95
Therefore, the new dielectric constant is 3.95.

c) The new voltage can be calculated as,
V2 = V1(C1/C2)
Substituting the given values in above equation,
V2 = 110(3.23 x 10^-6/5.63 x 10^-3)
V2 = 0.063 V
Therefore, the new voltage is 0.063 V.

d) The electric field can be expressed as,
E = V/d
d = V/E
Substituting the given values in above equation,
d = 63/8.99 x 10^4
d = 7.01 x 10^-4 m
The voltage, V = 110 V > working voltage, Vw = 63 V

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Answer:

The methane gives Neptune the same blue color as Uranus.

Explanation:

Answer:

Uranus and Neptune are the two most distant planets in our solar system

Both are different from the larger gas giants Jupiter and Saturn, and from smaller rocky worlds like Earth

Uranus and Neptune have similar masses and internal compositions

Explanation:

The correct answer is B. A graded potential occurs as an electrical current to neighboring areas of membrane initiates.

Electric current is the flow of electric charge in a circuit. It is measured in amperes (amps). Electric current can be generated in several ways, such as through batteries, generators, or solar cells. The types of electric current that are most common are direct current (DC) and alternating current (AC). DC flows in one direction and AC reverses direction periodically. Electric current is essential for powering electrical equipment and devices, such as lights, motors, and computers.

This current causes a change in the membrane potential, causing either depolarization or hyperpolarization, depending on the strength of the current. This change in potential is known as a graded potential, and can be either excitatory or inhibitory. If the graded potential is strong enough, it can lead to the initiation of an action potential in the area of the axon.

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Answer:

It is not possible to change direction twice, given constant acceleration. To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.Explanation:

Answer:It is not possible to change direction twice, given constant acceleration. 

Explanation:To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.

Answer:

B is the best answer for the question

Answer:

C

Explanation:

The weight of water displaced by a floating ship is equal to the weight of the ship itself. Since the mass of the ship is 105 kg, we can use the formula weight = mass x gravity, where gravity is 9.8 m/s². Therefore, the weight of water displaced by the ship is 105 x 9.8 = 1,029 N (newtons).

To determine the weight of water displaced by a floating ship whose mass is 105 kg, we can follow these steps:

1. Convert the mass of the ship to weight. Weight (W) can be calculated using the formula W = m × g, where m is the mass of the object (in this case, 105 kg) and g is the acceleration due to gravity (approximately 9.8 m/s²).
W = 105 kg × 9.8 m/s²

W ≈ 1029 N (Newtons)

2. Apply the Archimedes' principle, which states that the buoyant force (B) acting on a floating object is equal to the weight of the fluid displaced by the object. In this case, the buoyant force is equal to the weight of the water displaced.

3. Since the ship is floating, the buoyant force is equal to the weight of the ship. Thus, the weight of the water displaced is also 1029 N. So, the weight of water displaced by the floating ship with a mass of 105 kg is approximately 1029 N.

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Answer:

10 floors

Explanation:

We are told that a bell of mass 20 kg is atop a tower and has 8829 J of gravitational energy. The question asks us to estimate the number of floors the tower has.

To do this, we must first calculate how high above the ground the bell is. We can do that using the formula for gravitational potential energy:

\(\boxed{g.p.e = mgh}\),

where:

• g.p.e = gravitational potential energy (8829 J)

• m = mass of object (20 kg)

• g = acceleration due to gravity (approximately 10 m/s²)

• h = height of object above ground (? m).

Using the above information and formula, we can solve for h:

g.p.e = \(20 \times 10 \times h = 8829\)

       ⇒ \(200 h = 8829\)

       ⇒ \(h = \frac{8829}{200}\)

       ⇒ \(h = \bf 44.145 \ m\)

Therefore the bell is 44.145 m above the ground, which means that the height of the tower is also 44.145 m.

One floor of a building can be estimated to be around 4.3 m, therefore the number of floors the tower has is:

44.145 ÷ 4.3

≈ 10

Therefore there are 10 floors in the tower.

The list of power sources from the lowest net energy to the highest net energy can be ordered as follows: a) PV (photovoltaic) cells, b) nuclear, and c) hydroelectric.

a) PV cells, also known as solar panels, convert sunlight directly into electricity. Although they are a renewable and environmentally friendly energy source, their net energy is relatively low compared to other sources. The efficiency of PV cells varies, but on average, it is around 15-20%. Their output depends on factors such as sunlight intensity, location, and the angle of installation.

b) Nuclear power comes from the process of nuclear fission, in which atoms of uranium are split to release a large amount of energy. Nuclear power plants are capable of producing a significant amount of electricity. However, the net energy of nuclear power is limited by the high costs of constructing and maintaining nuclear plants, as well as the management and disposal of radioactive waste. Despite these limitations, nuclear power has a higher net energy than PV cells.

c) Hydroelectric power is generated by harnessing the kinetic energy of flowing water to produce electricity. This method of energy production has the highest net energy among the three sources listed. Hydroelectric plants have high efficiency rates, typically around 90%, and are able to produce electricity consistently. Moreover, they have lower greenhouse gas emissions and a longer life span compared to other power sources. The major constraint for hydroelectric power is the availability of suitable locations with ample water resources, such as rivers and dams.

Hence the order would be a, b and then c.

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The current through the circuit after 12.5 ms is 2.5864 A.

The characteristic time constant of a 23.2 mh inductor that has a resistance of 4.21 ω is 5.82115 ms.

If it is connected to a 12.0 v battery, the current after 12.5 ms will be 2.5864 A.

Below are the steps to get to the answer:(a) Calculate the characteristic time constant of the circuit using the formula:τ = L/RWhere τ is the time constant, L is the inductance of the inductor, and R is the resistance of the circuit.tau=23.2mH/4.21Ω=5.82115ms

Hence, the characteristic time constant of the circuit is 5.82115 ms.

(b) To calculate the current through the circuit, we need to use the formula:i = (V/R) [1 - e(-t/τ)]Where i is the current, V is the voltage of the battery, R is the resistance of the circuit, t is the time, and τ is the characteristic time constant of the circuit.i = (12/4.21) [1 - e(-12.5/5.82115)]i = 2.5864

Hence, the current through the circuit after 12.5 ms is 2.5864 A.

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There are several reasons why the height of the stairwell calculated based on the speed of sound might not be accurate. Here are two possible reasons:

Other potential reasons for inaccuracy could include echoes or reverberations that are not directly related to the height of the stairwell, such as sound reflections from nearby objects or irregularities in the stairwell's structure that affect the propagation of sound waves. Additionally, if the stairwell is not perfectly enclosed, sound may escape or enter from other openings, affecting the accuracy of the measurement.

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♥️ \(\large{\underline{\textcolor{red}{\mathcal{SUMIT\:\:ROY\:\:(:\:\:}}}}\)

Answer:

129.12 ml

Explanation:

If answer is correct feel free to replay me for explanation.

At the moment t depicted in the diagram, the statement that is true is option C) I2 leads I1 by π. In figure 2, we can see that the phasor I1 is at the horizontal axis, while the phasor I2 is at an angle of 3π/4 with respect to the horizontal axis.

When two phasors have the same frequency, their relative phase shift can be determined by the angle between them. The angle between I2 and I1 is 3π/4 radians, which is equivalent to 135 degrees.

Since one complete cycle in an AC circuit corresponds to an angle of 2π radians or 360 degrees, a phase shift of π radians or 180 degrees corresponds to half a cycle. Therefore, a phase shift of 3π/4 radians corresponds to 3/8 of a cycle.

Since I2 is ahead of I1 by 3π/4 radians, we can say that I2 leads I1 by 3/8 of a cycle or π/4 radians. Therefore, option C) I2 leads I1 by π is the correct statement.

To determine the relative phase shift between two phasors with the same frequency, we need to find the angle between them. A phase shift of π radians or 180 degrees corresponds to half a cycle. Therefore, we can use the angle between two phasors to determine their relative phase shift in terms of cycles or radians. In this case, at the moment t depicted in the diagram, I2 leads I1 by π/4 radians or 3/8 of a cycle.

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The correct arrangement of light at different wavelengths, in order from smallest to largest frequency, is as follows: gamma rays, X-rays, ultraviolet (UV) rays, visible light, infrared (IR) radiation, microwaves, and radio waves.

Gamma rays have the shortest wavelengths and highest frequencies among the electromagnetic spectrum. They are produced by nuclear reactions and radioactive decay processes. X-rays have slightly longer wavelengths and lower frequencies than gamma rays, and they are commonly used in medical imaging.

Ultraviolet (UV) rays have even longer wavelengths and lower frequencies than X-rays. They are present in sunlight and are responsible for causing sunburn and skin damage.

Visible light, comprising the colors of the rainbow, has longer wavelengths and lower frequencies compared to UV rays. It is the part of the spectrum that is detectable by the human eye.

Infrared (IR) radiation has longer wavelengths and lower frequencies than visible light. It is commonly used for heat detection and remote controls.

Microwaves have even longer wavelengths and lower frequencies than infrared radiation. They are used for communication and cooking.

Finally, radio waves have the longest wavelengths and lowest frequencies among the electromagnetic spectrum. They are used for broadcasting radio and television signals, as well as for telecommunications.

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Observation:
- Mr. Wilson was not wearing gloves while cooking, which is a violation of the company's safety procedures.
- The incident occurred because of the worker's inability to comply with the safety procedures.
- There is a need for stricter safety guidelines and enforcement of personal protective equipment usage in the workplace.
Methodology:
- The team also obtained copies of the safety procedures currently practiced by the kitchen staff for further analysis.
Findings:
- The root cause of the accident was the worker's failure to follow the company's safety procedures, specifically the requirement to wear gloves while cooking.
- The reasons for the accident include a lack of awareness about the importance of wearing gloves and a lack of enforcement of the safety procedures.
Conclusion:
- The incident could have been prevented if the worker had followed the company's safety procedures and worn gloves while cooking.
- There is a need for stricter safety guidelines and enforcement of personal protective equipment usage in the workplace to prevent similar incidents from occurring in the future.
Suggestion:
- The company should implement stricter safety guidelines and conduct regular training sessions for employees to reinforce the importance of following safety procedures.
- The company should also enforce the usage of personal protective equipment in the workplace and hold employees accountable for any violations.

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The weight of the box is 300 newton whereas the acceleration is 3.3 m/s2.

The weight of the box is 300 newton because weight is a force which move towards the center of the earth due to gravity and we know that gravity is 10 m/s2.

The box is moving with 3.3 m/s2 if we put in the formula below.

acceleration= force/mass

A = 100/30

A = 3.3 m/s2

So we can conclude that the weight of the box is 300 newton whereas the acceleration is 3.3 m/s2.

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Explanation:

it moves at a speed of 76 km/h hence the distance covered in an hour is 76 km

The north and west components of this displacement are 9.19 km and -7.71 km respectively.

The north component of the displacement is calculated as follows;

Dy = D sinθ

Dy = 12 km x sin50

Dy = 9.19 km

Dx = D x cosθ

Dx = - 12 km x cos(50)

Dx = -7.71 km

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Answer:

2450 J

Explanation:

Given that,

A 50Kg girl jumps off a 5-meter-high diving board.

We need to find the kinetic energy of the girl before she hits the water. At this point the kinetic energy becomes equal to the potential energy such that,

\(K=mgh\\\\K=50\times 9.8\times 5\\\\K=2450\ J\)

So, her kinetic energy right before she hits the water is equal to 2450 J.

Answer:

D. Sound waves

Explanation:

The following options are missing:

A. radio wave

B. X-rays

C. Light waves

D. Sound waves

There are two kinds of waves: longitudinal and transverse.

In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves  and ultrasound waves.

In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e.g. light waves, microwaves, radio waves and X-rays) are transverse waves.

The heat of neutralization of acetic acid from -51 kj/mmol to calories per millimole is 12189.3 cal/mmol.

The heat of neutralization of a substance is the amount of heat given off when one mole of water is produced from the reaction of an acid and a base.

The heat of neutralization of different acids and bases varies.

The heat of neutralization of acetic acid is given as -51 kj/mmol.

This means that 51 kJ of heat is given when 1 mmole of acetic acid reacts with a base to form water.

To convert the heat of neutralization of acetic acid from -51 kj/mmol to calories per millimole, we use the conversion factor between energy in Joules and energy in calories.

The conversion factor is given below:

1 cal = 4.184 Joules

51 kJ = 51000 Joules

51000 Joules = 51000 * 1 cal / 4.184 Joules

51000 Joules = 12189.3 calories

Hence, the heat of neutralization in cal/mmol is  12189.3 cal/mmol

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This statement is generally true. When an atom absorbs a photon, it is usually because the photon has the exact amount of energy needed to move an electron from a lower energy level to a higher energy level. When the electron moves to an upper orbital, the atom gains energy. This is known as an "excited state".

On the other hand, when an atom emits a photon, it is usually because an electron moves from a higher energy level to a lower energy level. When the electron moves to a lower orbital, the atom loses energy. This is known as a "relaxed state".

However, it should be noted that in some cases, an atom can emit a photon even when an electron moves to a higher energy level. This occurs when the electron moves to a higher energy level but then quickly falls back down to its original level, releasing a photon in the process. This is known as "fluorescence" and is a common process in many materials.

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The maximum value of the magnetic field in the given wave is 5 nT.

Given;

maximum value of the electric field, E₀ = 1.5 V/m

The maximum value of the magnetic field in the given wave is calculated as;

B₀ = \(\frac{E_{0} }{c}\)

where;

c is the speed of light = 3 x 10⁸ m/s

B₀ = \(\frac{E_{0}}{c}\)

B₀ = \(\frac{1.5}{3 . 10^{8} }\) = 0.5 x 10⁻⁸ = 5 x 10⁻⁹

B₀ = 5 nT

Therefore, the maximum value of the magnetic field in the given wave is 5 nT.

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The rock sitting on the cliff that is 25 m high has the gratest gravitational potential energy.

Potential energy is defined as the energy of an object by virtue of it's location. Mathematically, it is written as:

PE = mgh

Where

To determine the rock with the grater potential energy, we shall determine the potential energy of both rock assuming they have the same mass. Details below:

For rock sitting at 25 m high:

PE = mgh

PE = 10 × 9.8 × 25

PE = 2450 J

For rock sitting at 12 m high:

PE = mgh

PE = 10 × 9.8 × 12

PE = 1176 J

From the above calculation, we have:

Thus, we can conclude that the rock sitting at 25 m high, has the gratest potential energy.

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The total current flowing through the circuit is approximately 0.53 amps

To find the total current flowing through the circuit, we can use Ohm's Law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R).

First, we need to find the total resistance of the circuit. To do this, we add up the values of all the resistances: R_total = r1 + r2 + r3 + r4 = 14 + 6 + 6 + 10 = 36 ohms.

Next, we can use Ohm's Law to find the total current:

I = V / R_total = 19 / 36 = 0.53 amps.

Rounding to two decimal places, the total current flowing through the circuit is approximately 0.53 amps.

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Answer:

Cardiovascular or cardio exercise refers to exercise that strengthens the cardiovascular system. The term Aerobic just means in the presence of oxygen, and aerobic exercise refers to exercise that you perform long enough to require oxygen.