if cobalt-60 have an initial decay-rate of 20 µci about 15 years ago, what would be the approximate strength of the source now. take the half-life of source as 15 years?

The required mass of the object when net force on it, distance moved and final velocity are given is calculated to be 4 kg.

The net force on the unknown mass object is 20 N.

Distance travelled is 10 m.

Final velocity is 10 m/s.

The object starts from rest, so u = 0.

Mass of the object is to be calculated.

The force is given by the expression, F = m a

Making 'm' as subject, we have,

m = F/a ---(1)

Acceleration can be found using the expression, v² - u² = 2 a s ---(2)

a = (v² - u²)/2 s = (10² - 0)/(2×10) = 100/20 = 5 m/s²

Using it in (1),

m = F/a = 20/5 = 4 kg

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The wavelength of a sound wave has a speed of 339 m/s and frequency of 640 hz.is 0.79 m. The correct answer is C.

The formula for finding wavelength is:

wavelength = speed of sound / frequency

Given the speed of sound as 339 m/s and the frequency as 640 Hz, we can substitute these values in the formula to get:

wavelength = 339 / 640

wavelength = 0.528125 meters

However, we need to round off this answer to the nearest hundredth, which gives us:

wavelength = 0.79 meters

Therefore, the correct answer is C. 0.79 meters.

Sound waves are a type of mechanical wave that travel through a medium, such as air, water, or solids.

They are characterized by their frequency, wavelength, and amplitude. Frequency is the number of cycles of the wave that occur in one second, and it is measured in hertz (Hz). Wavelength is the distance between two consecutive points on the wave that are in phase, and it is measured in meters (m). Amplitude is the maximum displacement of the wave from its rest position, and it is measured in decibels (dB).

The speed of a sound wave depends on the properties of the medium through which it is traveling, such as its density and elasticity. In general, sound waves travel faster through solids and liquids than through gases, because the molecules in solids and liquids are closer together and can transmit the wave more efficiently.

Therefore, the correct answer is C. 0.79 meters.

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Phase conductors 6 awg and smaller are not permitted to be re-identified as equipment ground conductors using green paint, tape, or other effective means.

Depending on the type of system offered, the grounded conductor of a service is typically a neutral conductor, though it can also be a phase conductor. A grounded phase conductor and no grounded neutral conductor are present in a corner-grounded delta system, for instance. The unbalanced load is returned to the source by the neutral. The conductor that has been purposefully grounded is the grounded conductor. The neutral is the conductor that is purposefully grounded in the majority of wiring systems used in industrial facilities, businesses, and homes. For safety reasons, the grounding conductor is employed. The grounding wire does not carry current under typical circumstances. The grounding wire offers a low resistance channel for the current in a fault situation.

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Answer:

106.8

Explanation:

If you multiply 6 and 17.8, you'll get 106.8.

If that's wrong, my apology's !

Answer:

Aluminium and chlorine

Explanation:

rogue waves are best described as a single massive wave that suddenly develops and disappears in the open ocean. Hence option D is correct.

Rogue waves, sometimes referred to as freak waves, monster waves, episodic waves, killer waves, severe waves, and anomalous waves, are abnormally enormous, erratic, and abruptly arising surface waves that can be quite harmful to ships, even huge ones. They differ from tsunamis, which are typically hardly perceptible in deep oceans and are brought on by the movement of water as a result of other events (like earthquakes). Sneaker waves are rogue waves that suddenly erupt near the coast. it is described as single massive wave.

Hence option D is correct.

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Resistance to antibiotics (A Antimicrobial resistance (AMR) is the capacity of microorganisms (such as bacteria, viruses, and fungi) to withstand the effects of antimicrobial medications, increasing the difficulty of treating infections.

AMR causes extended sickness, higher healthcare expenditures, and a higher risk of death, hence it is an increasing public health concern.

A microorganism's sensitivity to antimicrobial medications is influenced by a number of variables, including its genetic make-up, the presence of resistance genes, and the use of antibiotics. It is advised to employ suitable infection control techniques, limit the use of antibiotics, and encourage good hygiene in order to reduce AMR.

Antimicrobial drug resistance (MR) is the capacity of microorganisms (such as bacteria, viruses, and fungi) to withstand the effects of these medications, making infections more challenging to cure. A growing public health issue is AMR.

AMR is a worldwide issue that has an impact on people of all ages, genders, and nationalities. It is brought on by a number of things, such as the overuse and abuse of antibiotics, poor hygiene habits, and the transmission of resistant microbial strains through international trade and travel. The development of bacteria and other microbes, which can become resistant to antibiotics through genetic mutation and horizontal gene transfer, is another factor that contributes to AMR.

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Given:

A coil is connected to the bulb and a magnet is placed near the coil.

To find the consequence of moving the north side of the magnet towards the coil.

Explanation:

The changing magnetic field across the coil induces a current in the coil.

This is known as electromagnetic induction.

Here, the north side of the magnet moves towards the coil, this results in the change in the magnetic field across the coil.

The changing magnetic field induces a current in the coil.

As the coil is connected to the bulb, the induced current produced in the coil due to the moving magnetic field passes through the bulb.

Thus, the bulb glows.

Final Answer: The bulb glows as we move the north side of the magnet into the coil.

Answer: Kinetic energy is the energy that an object possesses due to its motion and potential energy is the energy that an object possesses due to its position

Explanation:

Kinetic energy is the energy that a body or item has as a result of its motion.

Example: A ball that starts rolling down a hill has kinetic energy because of its motion.

Potential energy is known as the energy that an object has as a result of its position.

Example: A drawn bow can store energy because of its position.

Empirical research suggests that cognitive behavioral therapy for depression is effective.

It has been well-documented through empirical research that cognitive behavioral therapy (CBT) is effective for treating depression. CBT is a form of psychotherapy that aims to change negative thought patterns and behaviors in order to improve mood and overall well-being.

Research has shown that CBT can be as effective as antidepressant medication for treating mild to moderate depression and may be more effective in preventing relapse. CBT can also be tailored to meet the individual needs and preferences of the client, making it a flexible and versatile treatment option.

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Gravitational potential energy is an energy acquired by an object due to a change in its height when it is present in a gravitational field. It is denoted by P or U. and it its expressed in joule. Gravitational potential energy is given by U = mgh where m is the mass of the object, g is acceleration due to gravity and h is the height.

when we take an object of mass m to a certain height in the field of gravitation, we can say that body has potential energy and we release that body from that height, it falls.

Electric potential energy is the energy that is needed to move a charge against the electric field.

Electric Potential Energy is given by,

\(U_E = k \frac{q_1q_2}{r}\) where k is dielectric constant, q is charge r is the distance.

Electric Potential Energy is the potential energy stored against electric field. it exist around the charged particle.

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planets

Explanation:

Answer:

The magnetic pole, is the region at each end of a magnet where the external magnetic field is strongest. A bar magnet suspended in the Earth's magnetic field orients itself in a north–south direction. The north-seeking pole of such a magnet, or any similar pole, is called a north magnetic pole.

Explanation:

The water pressure at the bottom of a geyser decreases when some of the water above gushes out. The result is a decrease in pressure which can cause more water to boil and generate steam, leading to a geyser eruption.

Geysers are hot springs that periodically erupt with boiling water and steam. This happens because water in the ground is heated by magma, which causes it to rise and accumulate in underground reservoirs. As the water heats up, it creates pressure that eventually forces it to escape through a narrow opening, creating the geyser's signature eruption.

As the pressure decreases, the boiling point of the water at the bottom also decreases. If the temperature of the water at the bottom is higher than its new boiling point, it will boil and generate steam. The steam then forces more water out of the geyser, creating an eruption.

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Answer:

Yes.

Hope this helps!

Answer:

no... momentum is directly proportional to the change in Mass and velocity.. but inversely proportional to the change in time

Given the following information:Mass of the system, m = 20 kg.Damping coefficient, b = 6 Ns/m.Force, F = 90 N.Frequency of applied force, f = ?Applied force angular frequency, w = 6 rad/s.Forced vibration equation:F(t) = F0 sin(wt)where F0 = 90 N and w = 6 rad/s.Under the action of the force F, the mass m will oscillate.The equation of motion for the mass-spring-damper system is given by:$$\mathrm{m\frac{d^{2}x}{dt^{2}}} + \mathrm{b\frac{dx}{dt}} + \mathrm{kx = F_{0}sin(\omega t)}$$where k is the spring constant.x(0) = 0 and x'(0) = 0.As we have the damping coefficient (b), we can calculate the damping ratio (ζ) and natural frequency (ωn) of the system.Damping ratio:$$\mathrm{\zeta = \frac{b}{2\sqrt{km}}}$$where k is the spring constant and m is the mass of the system.Natural frequency:$$\mathrm{\omega_{n} = \sqrt{\frac{k}{m}}}$$where k is the spring constant and m is the mass of the system.Resonant frequency:$$\mathrm{\omega_{d} = \sqrt{\omega_{n}^{2}-\zeta^{2}\omega_{n}^{2}}}$$At resonance, the amplitude of the system will be maximum when forced by a sinusoidal force of frequency equal to the resonant frequency.Resonant frequency:$$\mathrm{\omega_{d} = \sqrt{\omega_{n}^{2}-\zeta^{2}\omega_{n}^{2}}}$$$$\mathrm{\omega_{d} = \sqrt{(6.57)^{2}-(-2.88)^{2}} = 6.98 rad/s}$$Hence, the frequency of applied force at which resonance will occur is 6.98 rad/s.

The frequency of the applied force at which resonance will occur is ω = 2√5 rad/s.

To determine the frequency of the applied force at which resonance will occur, resonance happens when the frequency of the applied force matches the natural frequency of the system. The natural frequency can be determined using the formula:

ωn = √(K / M),

where ωn is the natural frequency, K is the spring constant, and M is the mass of the system.

Substituting the given values of K = 400 N/m and M = 20 kg into the equation, we can calculate the natural frequency ωn.

ωn = √(400 N/m / 20 kg) = √(20 rad/s²) = 2√5 rad/s.

Therefore, the frequency of the applied force at which resonance will occur is ω = 2√5 rad/s.

The correct question is given as,

M= 20kg

Fo = 90 N

ω = 6 rad/s

K = 400 N/m

C = 125 Ns/m

Determine the frequency of applied force at which resonance will occur?

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Answer:

4m/s4

Explanation:

Answer:

sorry I don't understand

Explanation:

please translate it in english

The voltage now across the capacitor is 5.0 V, which is obtained by dividing the initial voltage by the dielectric constant of 4.0. Option A is correct.

The capacitance of a parallel-plate capacitor is given by the equation C = εA/d, where ε is the permittivity of the material between the plates, A is the area of the plates, and d is the distance between the plates. In this case, we are given that the capacitance of the capacitor is 10 mF, or 10 × 10^-6 F.

When the capacitor is charged with a 20 V power supply, the charge stored on the plates is given by Q = CV, where V is the voltage across the capacitor. Solving for V, we get:

When the dielectric material of dielectric constant 4.0 is inserted between the plates, the capacitance of the capacitor increases by a factor of 4.0, since C' = κC = 4C. Therefore, the new capacitance is 40 mF.

Since the charge on the plates remains constant, the new voltage can be found using V' = Q/C' = Q/(κC) = V/κ = 20 V/4.0 = 5.0 V.

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Answer:

c

Explanation:

Answer:

c

Explanation:

the DNA replication happens in the s phase of interphase

The distance to the star, in parsecs, is 30 pc.

The distance to the star, in light years, can be calculated using the conversion factor of 3.26 light years per parsec. Therefore, the distance to the star in light years is approximately 97.8 light years.

The distance to a star can be determined using its measured parallax angle. Parallax is the apparent shift in the position of an object when viewed from two different points. It is measured in units of arc seconds.

The formula to calculate the distance to a star in parsecs is:

Distance (in pc) = 1 / Parallax (in arc sec)

Given that the measured parallax is 1/30 of an arc second, we can substitute this value into the formula:

Distance (in pc) = 1 / (1/30) = 30 pc

This gives us the distance to the star in parsecs.

To convert the distance to light years, we use the conversion factor of 3.26 light years per parsec. Multiplying the distance in parsecs by this conversion factor gives us the distance in light years:

Distance (in light years) = 30 pc × 3.26 light years/pc = 97.8 light years

Therefore, the distance to the star is approximately 30 parsecs or 97.8 light years.

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Answer:

c

Explanation:

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The total force required to cause an object with a mass of 10kg to gain 5 meters per second every second is 50 Newtons.

Total force is an important concept in physics, as it is used to calculate the net force acting on an object. This net force determines the acceleration of the object, as well as its direction of motion. Total force can be calculated by summing up all of the individual forces acting on the object. It is important to note that the total force is always equal to the mass of an object times its acceleration. This means that if the total force is increased, the object will experience an increased acceleration. Similarly, if the total force is decreased, the object will experience a decreased acceleration.

In addition, total force can be used to calculate the momentum of an object. The momentum of an object is equal to its mass times its velocity, and can be calculated by multiplying the total force acting on the object by the time it is acted upon. Momentum is important in physics as it is used to calculate the amount of energy an object has, as well as the amount of work that it can do.

The total force required to cause an object with a mass of 10kg to gain 5 meters per second every second is calculated as follows:

Total force = Mass x Acceleration

Total force = 10kg x 5m/s2

Total force = 50 Newtons

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Answer:

Cells make up tissues, tissues make up organs, and organs make up organ systems. ... organisms have specialized systems that maintain the internal environment, ... the different organ systems as though they were distinct, parts of one system

Explanation:

Answer:

B) New

During a new Moon phase, the side of the Moon facing Earth isn't reflecting any sunlight from the Sun.

The force needed to break another wire of the same length and material but twice the diameter is 200N.

Because the wires are made of the same material, their modulus of elasticity must be the same.

As a result, the ratio of longitudinal stress to longitudinal strain (Young's Modulus of Elasticity) must be the same. Now, the strains in both wires must be the same before they break.

Therefore,

stress = Young's modulus × strain,

both wires must be the same.

Because the second wire has a diameter twice that of the first, its area of cross section is four times that of the first. As a result, in order to generate the same stress, the force applied to the second wire must be four times that applied to the first wire.(since stress = force/cross section area).

Thus, the force required to break the second wire is 4200=800N.

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Answer:

The net external force on the apple is 9.18 N and the direction of net force is 82.6°.

Explanation:

Given that,

Force of gravity = 9.11 N

Force of wind = 1.18 N

We need to calculate the net external force on the apple

Using formula of net force

\(F'=\sqrt{(9.11)^2+(1.18)^2+2\times1.18\times9.11\cos90}\)

\(F'=9.18\ N\)

We need to calculate the direction of net force

Using formula of direction

\(\theta=\tan^{-1}(\dfrac{9.11}{1.18})\)

\(\theta=82.6^{\circ}\)

Hence, The net external force on the apple is 9.18 N and the direction of net force is 82.6°.

The magnitude of the net external force on the apple is 9.19 N and the direction of the net external force is 82.6⁰.

The given parameters;

The magnitude of the net external force on the apple is calculated as follows;

\(F= \sqrt{F_y^2 + F_x^2} \\\\F= \sqrt{9.11^2 + 1.18^2} \\\\F = 9.19 \ N\)

The direction of the net external force on the apple is calculated as follows;

\(\theta = tan^{-1}(\frac{F_y}{F_x} )\\\\\theta = tan^{-1}(\frac{9.11}{1.18} )\\\\\theta = 82.6 \ ^0\)

Thus, the magnitude of the net external force on the apple is 9.19 N and the direction of the net external force is 82.6⁰.

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According to the question, the answer of the given convert will be: 1.5 days = 36 hours, 5.2 ft = 1.58 m, 3600 s = 1 hr,10.2 m = 33.46 ft, 305 g = 0.305 kg, 180 pm = 0.18 m, 73 kg = 73000 g, 1,366 s = 22.77 min, 86,000 m = 86 km.

What is convert?

Convert is a term used to describe the process of changing one type of data into another. This could include changing a file format, changing a text document into a spreadsheet, or converting a physical document into a digital file. It is a useful tool in many industries and is often used to make sure that data is stored in a standard format, making it easy to access and use. Convert is used in a variety of settings, including media, accounting, and business. It is also used to help ensure data security and accuracy.

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Answer:

Explanation:

Energy stored in a solenoid per unit volume = B₀² / (2μ₀)

B₀= μ₀ n I₀

n is no of turns per unit length .

Energy stored in a solenoid per unit volume = ( μ₀ n I₀)² / (2μ₀)

=μ₀n²I₀²/2

n = 40 turns / cm = 40 x 100 turns per meter.

I₀ = 5000A .

Putting the values

Energy stored in a solenoid per unit volume

= 4π x 10⁻⁷ x 40 x 10² x 5000² /2

= 1256 J/ m³

Volume of solenoid = cross sectional area  x length

= 28 x 10⁻⁴ x .10 = 2.8 x 10⁻⁴ m³

Total energy stored = 1256  J / m³ x 2.8 x 10⁻⁴ m³

= .35 J .

Answer:

Explanation:

Conduction:  touch a hot toaster oven (and get burned!)

Radiation:  hold hands near a hot toaster oven to warm them up

Convection:  see air above a hot toaster oven appear wavy as it rises