4.
How does the United Nations Development Program use its resources?
It provides health programs for mothers and children.
O It develops natural resources.
It works to eliminate poverty through development.
O It invests funds in industrialized nations.
Economic

Answer:

C. Solids,Liquids, Gases

Answer:

10kg bowling ball has more kinetic energy

Hence, 1344 10 3 J of heat are needed to melt the ice. From 0°C to 4°C, heating water causes it to continuously contract rather than expand.

In accordance with the U.S. Energy Statistics Administration, coal, nuclear power, and natural gas made up the majority of the country's electrical generation in 2020. Renewable energy sources like wind, hydropower, solar, biomass, and geothermal are also used to generate electricity.

Using coal and oil, nuclear energy, biomass, geothermal, & solar thermal energy, steam turbines are used to produce the majority of the world's power. Gas turbines, hydroelectric turbines, wind turbines, & solar photovoltaics are some additional significant electricity generation systems.

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Since the decay rate is dependent upon the number of radioactive atoms, in terms of chemical kinetics, one can say that radioactive decay is a first order reaction process.

What is radioactivity ?

Radioactive decay is the loss of elementary particles from an unstable nucleus, ultimately changing the unstable element into another more stable element. There are five types of radioactive decay: alpha emission, beta emission, positron emission, electron capture, and gamma emission. Each type of decay emits a specific particle which changes the type of product produced. The number of protons and neutrons found in the daughter nuclei (the nuclei produced from the decay) are determined by the type of decay or emission that the original element goes through.

Also, radioactive decay is an exponential decay function which means the larger the quantity of atoms, the more rapidly the element will decay. Mathematically speaking, the relationship between quantity and time for radioactive decay can be expressed in following way:

dN/dt=−λN

or more specifically

dN(t)/dt=−λN

or via rearranging the separable differential equation

dN(t)/N(t)=−λdt

by Integrating the equation

ln⁡N(t)=−λt+C

with

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Answer:

Puck 1 = 12 m/s

Explanation:

Conservation of energy

KE_1a + KE_2a = KE_1b + KE_2b

(1/2)(0.1kg)(15m/s)^2 + (1/2)(0.1kg)(12m/s)^2 = (1/2)(0.1kg)(V)^2 + (1/2)(0.1kg)(15m/s)^2

V = 12m/s

Answer:

12 m/s west

Explanation:

just did it

Answer:

=24.25 ^−1

Explanation:

Let   and   be initial and final velocity of the body respectively,  

be acceleration due to gravity ( 9.8^−2 ),  ℎ be the height of the body.

=0 ^ −1

ℎ=30

we know that, ^2−^ 2=2ℎ

^2=2∗9.8∗30

^2=588

=24.25 ^−1

Explanation:

The torque \(\tau\) is given by

\(\tau=Fd = (65\:\text{lbs})(\frac{8}{12}\:\text{ft}) = 43.3\:\text{lbs-ft}\)

Answer:

a

Explanation:

Answer: b. more precipitation

Explanation:

Answer: Distance traveled in time t is s

Explanation: Self Explanatory

Answer: \(0.00680\ m^3\)

Explanation:

Given

The weight of the object, when submerged in the water is \(980\ N\)

When it is submerged in the bromine liquid, it weighs \(840\ N\)

Suppose,

\(\rho=\text{Density of object}\\\rho_w=\text{Density of water}\\\rho_b=\text{Density of bromine}\\V=\text{Volume of the object}\)

for water,

\(\Rightarrow V(\rho -\rho_w)g=980\quad \ldots(i)\)

For bromine

\(\Rightarrow V(\rho-\rho_b)g=840\quad \ldots(ii)\)

Divide (i) and (ii)

\(\Rightarrow \dfrac{\rho-1000}{\rho-3100}=\dfrac{980}{840}\\\\\Rightarrow 840\rho -840\times 1000=980\rho-980\times 3100\\\\\Rightarrow 140\rho=(3038-840)\cdot 1000\\\\\Rightarrow \rho=15,700\ kg/m^3\)

Put the density value in equation (i)

\(\Rightarrow V(15,700-1000)\cdot 9.8=980\\\\\Rightarrow V=\dfrac{100}{14,700}\\\\\Rightarrow V=0.00680\ m^3\)

Answer:

56.25J

Explanation:

Kinetic energy = 1/2 x 4.50 x (5.00)^2= 1/2 x 4.50 x (5.00 x 5.00)= 1/2 x 4.50 x 25Multiply through = 112.5/2= 56.25J

Answer:

is there any more to this question

Explanation:

Answer:

c. Both yes and no.

Explanation:

Answer:

Explanation:

The electric flux through a surface is given by the dot product of the electric field and the area vector of the surface:

Φ = E · A

where Φ is the electric flux, E is the electric field, and A is the area vector of the surface.

(a) If the surface lies in the yz plane, its area vector is in the x direction. Therefore, the area vector can be written as A = Ax i, where Ax is the magnitude of the area. The electric field is given as E = ai + bj. Therefore, the flux through the surface is:

Φ = E · A = (ai + bj) · (Ax i) = aAx

(b) If the surface lies in the xz plane, its area vector is in the y direction. Therefore, the area vector can be written as A = Ay j, where Ay is the magnitude of the area. The electric field is given as E = ai + bj. Therefore, the flux through the surface is:

Φ = E · A = (ai + bj) · (Ay j) = bAy

(c) If the surface lies in the xy plane, its area vector is in the z direction. Therefore, the area vector can be written as A = Az k, where Az is the magnitude of the area. The electric field is given as E = ai + bj. Therefore, the flux through the surface is:

Φ = E · A = (ai + bj) · (Az k) = 0

since the dot product of perpendicular vectors is zero.

1. The electron experiences acceleration and moves independently in the y-direction.

2. The y-component of the electron's displacement after 2.40 μs in the electric field is -8.11 μm.

3.  The x-component of displacement remains zero.

To calculate the y-component and x-component of the electron's displacement, we need to consider the motion of the electron in the electric field. Let's break it down step by step:

1. Acceleration of the Electron:

The electric field causes a force on the electron given by the equation: F = qE, where F is the force, q is the charge of the electron, and E is the electric field.

Since the charge of an electron is -1.6 × \(10^-^1^9\) C, and the electric field is 201 N/C, we can calculate the force:

F = (-1.6 × \(10^-^1^9\)C) * (201 N/C)

  = -3.216 × \(10^-^1^7\) N

Using Newton's second law, F = ma, we can find the acceleration (a) of the electron:

a = F / m

  = (-3.216 × \(10^-^1^7\) N) / (9.109 ×\(10^-^3^1\) kg)

  = -3.530 × \(10^1^3 m/s^2\)

2. Displacement in the y-direction:

Since no other forces act on the electron, its motion in the y-direction is independent of the electric field. The equation for displacement (y) under constant acceleration is:

y = (1/2) * a *\(t^2\)

Substituting the values, where the time (t) is 2.40 μs (2.40 ×\(10^-^6\) s), we can calculate the y-component of displacement:

y = (1/2) * (-3.530 ×\(10^1^3 m/s^2\)) * (2.40 ×\(10^-^6 s)^2\)

  = -8.11 μm

Therefore, the y-component of the electron's displacement 2.40 μs after entering the electric-field region is -8.11 μm.

3. Displacement in the x-direction:

Since the electron's velocity is only in the y-direction initially, the x-component of the displacement remains zero. Without any forces acting in the x-direction, the electron continues to move in the y-direction without changing its x-position.

Hence, the x-component of the electron's displacement 2.40 μs after entering the electric-field region is 0 meters.

Please note that the calculations provided are based on the given values and the provided formulas for displacement and acceleration.

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Answer:

Salinometer, also called salinimeter or salimeter, device used to measure the salinity of a solution. It is frequently a hydrometer that is specially calibrated to read out the percentage of salt in a solution.

Explanation:

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In general, the option that I think is the best way to enter a new market is option B: joint venture and the location should be in a remote place as well as a place that is close to available market.

A person can get an edge over your rivals by entering new markets, especially emerging ones. You have the first-mover advantage and an opportunity to develop a brand presence as the go-to location if they don't already operate in that country. New locations, as indicated, also bring new opportunities.

Therefore , by expanding your firm into new markets entails finding niche product markets or adjacent sectors where you can prosper. To advance your firm in one or more ways, you need enter a new market.

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Answer:

Option (d) is correct.

Explanation:

As the large mass M is found to just balance two of the small mass, m, so

\(M=2m\cdots(i)\)

As both the masses M as well as m are forced to go around a bend of 1.0 m at a constant speed of 1.0 m/s.

So, the radius of curvature of the bend (curved path), R= 1.0 m

The speed both the masses, v= 1.0 m/s.

Naturally, without any restriction, all the masses have the tendency to move in a straight line due to its inertia, but here both the masses are moving on the curved path because of the application of the external force on them. This continuous change in the direction is due to the force by the wall of the curved path which is actually the normal reaction by the wall on both the masses.

This reaction force, \(F_R\), balance the centrifugal force, F with which the masses have a tendency to go out of the path, the magnitude of this centrifugal force is,

\(F = \frac {mv^2}{R}\)

Where m is the mass of the body, v is the speed at that instant, R is the radius of curvature of the path.

So, \(F_R=\frac {mv^2}{R}\)

Now, for the small mass, m, the reaction force on it is

\(F_R1= \frac {mv^2}{R}\)

\(\Rightarrow F_R1= \frac {m(1)^2}{1}\)

\(\Rightarrow F_R1= m \cdots(ii)\)

And for the bigger mass, M, the reaction force on it is

\(F_R2= \frac {Mv^2}{R}\)

\(\Rightarrow F_R2= \frac {M(1)^2}{1}\)

\(\Rightarrow F_R2= M\)

By using equation (i), we have

\(F_R2= 2m\)

\(\Rightarrow F_R2=2F_R1\) [by using (ii)]

\(\Rightarrow F_R2 / F_R1 = 2/1\)

So, the ratio of force acting on the bigger mass M to the magnitude of the force acting on the smaller mas m is 2:1.

Hence, option (d) is correct.

The specific heat of the unknown substance is 6.84 J/gºC

First, we shall convert 132.8° F to ° C. Thisis illustrated below:

°C = (°F − 32) × 5/9

°C = (132.8 − 32) × 5/9

°C = 56 °C

Next, we shall determine the heat absorbed by the water. This is illustrated below:

Q = MCΔT

Q = 188 × 4.184 × 11

Q = 8652.512 J

Finally, we shall determine the specific heat capacity of the unknown metal. This can be obtained as follow:

Q = MCΔT

-8652.512 = 56 × C × -22.6

-8652.512 = C × -1265.6

Divide both sides by -1265.6

C = -8652.512 / -1265.6

C = 6.84 J/gºC

Thus, the specific heat capacity is 6.84 J/gºC

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Answer:

The atomic number

Explanation:

The initial condition is mathematically given as  t=0 and m=125 in the equation.

The given problem tells us that

\(&\frac{d m}{d t} \infty m^{2 / 3}\\\)

because  mass m decreases at a rate proportional to its surface

the area so the constant of proportionality is negative

therefore we will take as a constant proportionality

Rewrite the given proportionality equation

\(&\frac{d m}{d t} \infty m^{2 / 3} \\\)

\(\frac{d m}{d t}=-k^2 m^{2 / 3}\)

\(\frac{d m}{m^{2 / 3}}=-k^2 d t\\\)

\(\int m^{-2 / 3} d m=-k^2 \int d t \quad \text\)

\(\frac{m^{-2 / 3+1}}{1-\frac{2}{3}}=-k^2 t+C_1 \quad\left\)

\(C_1=\text { intregal constant and } \int x^n d x=\frac{x^{n+1}}{n+1}\right]\\\)

\(&\Rightarrow 3 m^{1 / 3}=-k^2 t+C_1\\\\&\Rightarrow m^{1 / 3}=-\frac{k^2 t}{3}+\frac{C_1}{3}\\\\&\Rightarrow m^{1 / 3}=-\frac{k^2 t}{3}+C \quad \ldots\)

\(C=\frac{C_1}{3}\)

Now if at

t=0

the mass  m=125

\((125)^{1 / 3}=-\frac{k^2 \times 0}{3}+C\)

\(&\Rightarrow\left(5^3\right)^{1 / 3}=C\)

C=5

Substitute }

\(C=5 \text { in eq.(1) }\)

\(&m^{1 / 3}=-\frac{k^2 t}{3}+5\\\\&\Rightarrow m=\left(5-k^2 t / 3\right)^3\)

In conclusion, the initial condition should be  t=0 and m=125

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Slope is rise over run, meaning the ratio of the change in height to the change in horizontal distance. So a slope of 15.80 corresponds to an angle of ascension θ of

tan(θ) = 15.80   →   θ ≈ 86.38°

The order of the blocks (i.e. whether the large one is pulling the smaller one up or vice versa) does not matter, since friction is not a concern. So if we take the connected blocks as a single mass, by Newton's law we have a net force acting parallel to the incline of

∑ F = P - (M + m) g sin(θ) = (M + m) a

(see the attached free body diagram)

where

P = magnitude of the push

g = 9.80 m/s²

a = 2.53 m/s²

and M and m are the given masses.

Then the system requires a push of

P = (M + m) (a + g sin(θ))

P = (14.2 kg + 4.73 kg) (2.53 m/s² + (9.80 m/s²) sin(86.38°))

P ≈ 233 N

If you have to find the tension in the rope, consider the free body diagram for one of the blocks. By Newton's second law, the net parallel force acting on, say, the larger block (if it's being pulled by the rope) is

∑ F = T - M g sin(θ) = M a

where

T = tension in the rope

Then

T = M (a + g sin(θ))

T = (14.2 kg) (2.53 m/s² + (9.80 m/s²) sin(86.38°))

T ≈ 175 N

Answer:

Thermal expansion causes the bar to expand in length (also, thermal contraction causes the bar to shrink). Having the meter measured in this way allows for consistency and can be easily converted.

Explanation:

To calculate the final temperature of an air-metal mixture, we need to use the principle of heat transfer.

The heat transfer equation states that the heat gained by the metal is equal to the heat lost by the air. This equation can be written as:

mcΔT = mairCpΔT

To make a prediction of the final temperature, we need to consider factors such as the thermal conductivity of the metal and air, the specific heat capacities of the materials, and the heat transfer coefficients at the metal-air interface. Additionally, the shape and size of the metal object and the surrounding environment can affect the final temperature.

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Answer:

A) F = 21.134 N

B) a = 3180.76 × 10^(24) m/s²

Explanation:

A) We are given;

Mass of alpha particle; m = 4.0026 u

Now, 1u = 1.66 × 10^(-27) kg

Thus; m = 4.0026 × 1.66 × 10^(-27)

Distance apart; r = 6.60 × 10^(−15) m

Charge on the alpha particle is;

q = 2e = 2 × 1.6 × 10^(-19) C

Formula for the force between the two alpha particles is;

F = kq1.q2/r²

k = 8.99 × 10^(9) N.m²/C²

q1 = q2 = 2 × 1.6 × 10^(-19) C

F = 8.99 × 10^(9) × (2 × 1.6 × 10^(-19))²/(6.60 × 10^(−15))²

F = 21.134 N

B) acceleration is given by;

a = F/m

Thus; a = 21.134/(4.0026 × 1.66 × 10^(-27))

a = 3180.76 × 10^(24) m/s²

Answer:

B. 20 kj is released

Explanation:

A.P.E.X. CST

A boat must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the coast) with respect to a line should be 1.57 m/s for a boat moving at 1.75 m/s in still water.

Perpendicular lines are two different lines that cross at a right angle of 90 degrees. Here, AB and XY connect at a 90-degree angle, making AB perpendicular to XY. The two lines do not intersect and run parallel to one another. They can't possible be compared side by side.

A form is considered perpendicular if at least two of its sides are 90 degrees from one another. Shapes with perpendicular sides include the following: Square. Rectangle.

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Answer:

Centripetal force formula

Explanation:

F = mv²

----

r