Can someone help me out??? I need this done ASAP TYSM!!

Any online is a platform that allows students to access lecture notes, textbook solutions, and other study materials uploaded by other students. It does not have anything to do with predicting the decay time for a nucleus or observing patterns in nuclear decay.

However, in terms of nuclear decay, there are some patterns that can be observed. For example, the half-life of a radioactive substance is constant, regardless of the amount of material present. This means that the amount of material that remains after one half-life is always half of the original amount.

Watching what happens in the bottom-half of the display can provide information about the decay of a nucleus. The bottom-half of a decay curve represents the amount of material remaining over time. As time passes, the amount of material decreases exponentially. The half-life can be calculated from the decay curve by finding the time at which half of the material has decayed.

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The voltage across the 4.2 F capacitor is 28.25 V.

To find the voltage across the 4.2 F capacitor, we can use the formula:

\(V = \frac{Q}{C}\)

Where V is the voltage, Q is the charge on the capacitor, and C is the capacitance.

We know:

First, sing the formula for capacitance in series, we can find the total capacitance:

\(\frac{1}{C_{total}} = \frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{c_3} \\ \frac{1}{C_{total}} = \frac{1}{4,2} + \frac{1}{8,5} + \frac{1}{16,3}\\ \frac{1}{C_{total}} = 0,4213\\ C_{total} = 2,3728 F\)

Now we can use the formula for the total charge on the capacitors:

\(Q = C_{total} . V\\Q = 2.3728 F . (50.0 V)\\Q = 118.64 nC\)

Since the charge is the same on each capacitor, we can use the formula for voltage on a capacitor to find the voltage across the 4.2-f capacitor:

\(V_{4,2} = \frac{Q}{C_{4,2}} \\V_{4,2} = \frac{118.64 nC}{4,2F} \\V_{4,2} = 28.25 V\)

Therefore, the voltage across the 4.2 F capacitor is 28.25 V.

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Answer:

4. y = 2.38333t - 26.55 is the answer.

Given that distance of moon from the earth is, R= 3.84 x 10^8 m

Also, time taken to complete one revolution is, T= 23.7 days = 2047680 seconds

Mass of the moon is, m= 7.347 Kg

To find the centripetal acceleration,

Substituting the values, we get

No atomic  model is a picture of an atom but only helps explain the behavior of one

We know that the atom is the smallest particle of a substance that is able to take part in a chemical reaction. We know that in the atom there are certain smaller particles that we can be able to refer to as the subatomic particles.

In this case, we are talking about the different models that we can be able to use to show the atom. None of these models can be said to show the atom exactly but can approximate how the atom behaves.

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Answer:

The force is equal to the mass times acceleration:

F = m•a

F = 8•0.5

F = 4 N

Answer:

D

Explanation: need good posture other wise will injury yourself during activity

The cork leaves the spring at a speed of 3.02 m/s.

We can use the conservation of energy to determine the speed at which the cork leaves the spring.

The initial potential energy stored in the spring is converted to the kinetic energy of the cork as it leaves the spring. Neglecting air resistance, the conservation of energy equation is:

(1/2) k x^2 = (1/2) m v^2

where k is the spring constant, x is the distance the spring is compressed, m is the mass of the cork, and v is the speed of the cork as it leaves the spring.

Substituting the given values:

(1/2) * 18 N/m * (7.47 cm / 100 cm/m)^2 = (1/2) * 0.009 kg * v^2

Solving for v:

v^2 = (18 N/m * (7.47 cm / 100 cm/m)^2) / 0.009 kg

v^2 = 9.119 m^2/s^2

Taking the square root of both sides:

v = 3.02 m/s

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Answer:

Exactly 27 m/s

Explanation:

P=mv

P(cannon)=2.7*1.7

P(cannon)=4.59 kg*m/s

P(cannon)=P(tshirt)

4.59=0.17*v

v=27 m/s

Answer:

1 book per shelf

Explanation:

So, there's 20 books, and Jeremy has 4 shelves

If Jeremy arranges the books equally. so each shelf has the same out of books, do 20 / 4 to get the amount of books per shelf

20 / 4 = 5 books per shelf

Now, if Brandon takes away 4 books from each shelf, do 5 - 4 to find the remaining amount of books per shelf

5 - 4 = 1

1 book per shelf left

The weight of the wooden pole is 500 N. The correct answer is option A.

To determine the weight of the wooden pole, we can use the principle of moments. The pole is balanced horizontally when the sum of the clockwise moments is equal to the sum of the counter clockwise moments.

When pivoted at a point 2 m from end P, the weight of the pole can be balanced by the moment created by the weight of the pole itself. Let's denote the weight of the pole as W_pole. The clockwise moment created by the weight of the pole is W_pole * 2 Nm.

When pivoted at a point 2 m from end Q, a weight of 500 N is needed to balance the pole horizontally. The counterclockwise moment created by the weight of 500 N is 500 N * 2 Nm.

Since the pole is balanced horizontally in both cases, the clockwise moment and the counter clockwise moment must be equal.

W_pole * 2 Nm = 500 N * 2 Nm

Simplifying the equation:

W_pole = 500 N

Therefore, the weight of the wooden pole is 500 N. The correct answer is option A.

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Answer:

Explanation:

C. Adding salt to water increases the boiling point and decreases the freezing point.

Answer:

Explanation:

The formula for the magnitude of a vector is

\(B_{mag}=\sqrt{(-1.33)^2+(2.81)^2}\) and then round to the hundredths place:

3.11 m. Since we are in Q2, we can also find the direction of this vector:

\(tan^{-1}(\frac{2.81}{-1.33})=-64.7\) but since we are in Q2, we add 180 degrees to the result, getting the angle to be 115.3

Answer:115.33

Explanation:

The final velocity of the ball when it is caught is 20.58 m/s

Velocity is the rate of change of displacement.

To calculate the final velocity of the ball when it is caught, we use the formula below.

Formula:

Where:

From the question,

Given:

SUbstitute these values into equation 1

Hence, the  final velocity of the ball when it is caught is 20.58 m/s

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When an electron is moving due north in a region where the electric field points due west, then the electron curves away from due north towards the east. So, the option (D) is the correct answer.

The motion of the electron can be described by the Lorentz force equation:

F = qE + qv x B

Where,

F = force on a charged particle in newtons (N)

q = charge on a particle in coulombs (C)

E = electric field in volts per meter (V/m)

v = velocity of the charged particle in meters per second (m/s)

B = magnetic field in tesla (T)

The first term of the above equation, qE, is responsible for changing the direction of the charged particle (electron) due to the electric field. While the second term qv × B is responsible for the curve in the path of the charged particle due to the magnetic field.

Hence, the correct option is D.

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The voice that can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m is b) Male.

The velocity of sound in air is 343 m/s (at 20°C).

The wavelength of sound waves, also known as lambda, is the distance between two consecutive compressions or rarefactions.

A frequency of 1000 Hz produces a wavelength of 34.3 cm. If the frequency is 2000 Hz, the wavelength is half as long. The velocity of sound is constant, thus frequency is inversely proportional to wavelength.

Higher the frequency, shorter the wavelength.

Therefore, the formula used to calculate frequency is:f = v / λwhere f is the frequency in hertz (Hz), v is the velocity of sound in meters per second (m/s), and λ is the wavelength in meters (m).So, the frequency of sound is directly proportional to its speed and inversely proportional to its wavelength.

The pitch produced by a male voice can have a speed of 343 m/s and a wavelength of 0.68 m (343 / 0.68 = 503.6 Hz).

A summary is the pitch produced by a male voice can have a speed of 343 m/s and a wavelength of 0.68 m (343 / 0.68 = 503.6 Hz).

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Answer:

If the potential energy change of each cart is the same, then the total mechanical energy change is the same for each cart

Explanation:

Hills look steeper when standing back from the edge so that gaze is nearly parallel to the surface of the hill. When optical slant (the angle between the center of gaze and the surface) is small, surface orientation is pulled toward the direction of gaze

Answer:

P = 5880  J

Explanation:

Given that,

The mass of the block, m = 30 kg

The block is sitting at a height of 20 m.

The block will have gravitational potential energy. The formula for gravitational potential energy is given by :

\(P=mgh\\\\=30\times 9.8\times 20\\\\=5880\ J\)

So, the required potential energy is equal to 5880  J.

Answer:

hope this helps you :)

Explanation:

An object is in motion if its position changes relative to another object. To decide if you are moving, you can use your chair as a reference point. A reference point is a place or object used for comparison to determine if something is in motion.

Water droplets that act as prism are phenomenon known as : b) rainbow.

When light enters water droplet and is refracted, it is dispersed into its component colors due to difference in the index of refraction of each color of light. This results in band of colors in the shape of arc with red on outer edge and violet on inner edge, with other colors of spectrum in between. This is the same effect as prism which disperses light in the same way.

Rainbows appear in seven colors because water droplets break sunlight into seven colors of spectrum and you get the same result when sunlight passes through prism. Water droplets in the atmosphere act as prism though traces of light are very complex.

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To achieve a net gravitational force of zero on a third small-sized mass placed between a 155-kg mass and a 275-kg mass, it should be positioned approximately 0.98 meters from the 155-kg mass.

To find the position where the net gravitational force on the third mass is zero, we need to consider the gravitational forces exerted by the other two masses.

Let's label the masses as follows:

Mass 1: 155 kg

Mass 2: 275 kg

Mass 3: Unknown mass to be placed

According to Newton's law of universal gravitation, the gravitational force between two masses is given by:

F = (G * m1 * m2) / r^2

where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the masses.

Since we want the net gravitational force on the third mass to be zero, the forces exerted by Mass 1 and Mass 2 on Mass 3 must be equal in magnitude and opposite in direction.

Assuming the distance between Mass 1 and Mass 3 is x, and the distance between Mass 2 and Mass 3 is 1.50 m - x, we can equate the gravitational forces:

(G * m1 * m3) / x^2 = (G * m2 * m3) / (1.50 - x)^2

Simplifying the equation, we find:

m1 / x^2 = m2 / (1.50 - x)^2

Plugging in the given values, we can solve for x. The calculated value will give us the distance from Mass 1 where the net gravitational force on Mass 3 is zero.

Note: The numerical calculations are not provided in the response, as they require specific values for m1 and m2. However, following the outlined steps and formulas will allow you to obtain the numerical result.

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There will be 750 b nuclei after approximately 23.9 s.

The decay of a radioactive nucleus follows an exponential decay law, which means that the rate of decay is proportional to the number of undecayed nuclei at any given time. The mathematical expression for the number of undecayed nuclei as a function of time t is given by:

N(t) = N₀e^(-λt)

where N₀ is the initial number of undecayed nuclei, λ is the decay constant, and e is the base of the natural logarithm.

In this problem, we are given that the average lifetime of nucleus a is 10 s, which means that the decay constant is:

λ = 1/τ = 1/10 s^-1

where τ is the mean lifetime.

We are also given that at t=0, there are 1000 a nuclei and no b nuclei. Let N(t) be the number of undecayed a nuclei at time t, and let X(t) be the number of decayed a nuclei that have become b nuclei at time t.

We can write the following conservation equations for the system:

N(t) + X(t) = 1000 (1)

X(t) = Nb(t) (2)

where Nb(t) is the number of b nuclei at time t.

From equation (2), we can see that the number of b nuclei is equal to the number of decayed a nuclei that have become b nuclei. Therefore, we can write the following differential equation for Nb(t):

dNb/dt = λX(t) = λN(1000 - N - Nb) (3)

where we have used equation (1) to eliminate X(t).

Equation (3) is a first-order linear ordinary differential equation, which can be solved using standard techniques. The solution for Nb(t) is:

Nb(t) = [1000(1 - e^(-λt)) - N₀e^(-λt)]/(1 + e^(-λt))

Substituting the given values, we get:

Nb(t) = [1000(1 - e^(-0.1t)) - 1000]/(1 + e^(-0.1t))

To find the time at which Nb(t) = 750, we can solve the above equation for t numerically. Using a calculator or a computer algebra system, we can find that t ≈ 23.9 s.

Therefore, there will be 750 b nuclei after approximately 23.9 s.

The above derivation shows that the number of decayed nuclei that have become b nuclei follows an exponential growth law, which is the dual of the exponential decay law. The rate of growth is proportional to the number of undecayed nuclei at any given time, and the growth constant is equal to the decay constant. This is because the probability of a decayed nucleus becoming a b nucleus is proportional to the number of undecayed a nuclei, and the rate of decay of a is equal to the rate of growth of b.

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Answer:

a. 86.80 m

b. i. The mass of the bob

ii. The length of the pendulum

Explanation:

a. Determine the height of the smokestack.

Using T = 2π√(L/g) where T = period of pendulum = 18.7 s, L = length of pendulum = height of smokestack and g = acceleration due to gravity = 9.8 m/s².

So, making L subject of the formula, we have

T = 2π√(L/g)

T/2π = √(L/g)

squaring both sides, we have

(T/2π)² = L/g

L = (T/2π)²g

Substituting the values of the variables into the equation, we have

L = (T/2π)²g

L = (18.7 s/2π)²(9.8 m/s²)

L = (2.976 s)²(9.8 m/s²)

L = 8.857 s² × 9.8 m/s²

L = 86.796 m

L ≅ 86.80 m

b. What factors influence the period of a simple pendulum

The factors that influence the period of a simple pendulum are

i. The mass of the bob

ii. The length of the pendulum

Answer:b. 5.0 meters

Explanation: d² = 3²+4²

d² = 9+16

d² = 25

d = √25

d = 5m

The magnitude of the displacement is 5 m as shown in the diagram. Option B is correct.

What is displacement?

Displacement can be defined as the total change in the position of the object. It is a vector quantity.

From the Pythagorean theorem,

\(d =\sqrt { 3^2 +4^2}\\\\d = \sqrt {25}\\\\d = 5\)

Therefore, the magnitude of the displacement is 5 m.

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Answer:

A. 1.0x10^6 J

B. 53 W

C. 7.1x10^-2

D. 330 W

Explanation:

A) work done = mgh

so 71*9.8*1500=1.0x10^6 J

B) power = Work done/time

So P=1.0x10^6/19800 sec

P= 53 W

​

C) 1 HP =735 W

503 W= 7.1x10^-2 HP

D) efficiency =(output/ input) *100

so 16= (53/input) *100

input= 7.1x10^-2

Answer: It represents a small amount of oxygen being taken into the body when the body consumes more oxygen than what is being intake

Explanation: to be deficit means the amount of something is too small and there for oxygen deficit is a too small amount of oxygen.

The hold a shiny spherical ball to your face and look at your reflection, the image you see is a real image. This means that the light rays from your face are reflected off the surface of the spherical ball and converge to form an image behind the ball.

The image appears to be larger than you are because the curvature of the spherical surface magnifies the size of the image. This is why people use spherical mirrors to make telescopes and magnifying glasses. The image you see in the shiny spherical ball is not inverted because the light rays do not cross over each other as they do in a concave mirror. Therefore, the correct statement concerning your image in this case is that it is larger than you are. In summary, when you hold a shiny spherical ball to your face and look at your reflection, the image you see is a real image that is larger than you are due to the magnifying effect of the spherical surface. The image is not inverted, as it would be in a concave mirror.

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Answer:

as the mass of an object is increased, the acceleration of the object is decreased & vice-versa.

Explanation:

hope this helps!

Answer:

the angular acceleration of the gate is approximately 1.61  \(\frac{rad}{s^2}\)

Explanation:

Recall the formula that connects the net torque with the moment of inertia of a rotating object about its axis of rotation, and the angular acceleration (similar to Newton's second law with net force, mass, and linear acceleration):

\(\sum \tau_1=I\,\alpha\)

In our case, both forces contribute to the same direction of torque, so we can add their torques up and get the net torque on the gate:

\(\tau_{net}=(20*2+30*3.5) \,N\,m=145\,\,N\,m\)

Now we use this value to obtain the angular acceleration by using the given moment of inertia of the rotating gate:

\(\sum \tau_1=I\,\alpha\\145\,\,N\.m=(90\,\,kg\,m^2)\,\alpha\\\alpha= \frac{145}{90} \frac{rad}{s^2} = 1.61\, \frac{rad}{s^2}\)

The type of wave that requires a material medium through which to travel is Sound. The correct answer is option A.

Sound waves are mechanical waves, which means they require a medium (such as air, water, or solids) to travel through. In contrast, television, radio, and X-ray waves are all examples of electromagnetic waves, which can travel through a vacuum and do not require a material medium.

Television (option B), radio (option C), and X-ray (option D) waves are all examples of electromagnetic waves that can travel through vacuum and do not require a material medium. Therefore the correct answer is A: Sound.

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