8. An object of mass 4 kg moving with a speedof 29 m/s to the right collides with an objectof mass 11.5 kg moving with a speed of 18 m/sto the left. After collision, the 11.5 kg object movesto the right with a speed of 4 m/s to the right. Calculatethe velocity of the 4 kg object after collision. (1 point)A. O-53.475 m/sB. O-13.341 m/sC. O-34.25 m/sD. -19.579 m/sE. O-27.7 m/s9. An object of mass 2 kg moving with a speed

Answer:

Explanation:

Given that:

diameter of the circular plates = 16.8 cm

mass of the plastic bead = 1.8 g

charge q = -4.4 nC

From above, the area of the circular plates is:

\(Area = \pi r^2\)

\(Area = \pi (\dfrac{d}{2})^2\)

\(Area = \pi (\dfrac{16.8}{2*100} m)^2 \\)

Area = 0.022 m²

Thus, as the plastic beads glide between the two plates of the capacitor, there exists a  weight acting downwards while the weight is balanced by the force of the plates acting upwards.

Hence, this can be achieved only when the upper plate is positively charged.

b)

Recall that

Force (F) = qE

where;

F = mg

mg = qE

\(E = \dfrac{mg}{q}\)

\(E = \dfrac{1.8*10^{-3}*9.8}{4.4*10^{-9}}\)

E = 4.0 × 10⁶ N/C

From the electric field;

\(E = \dfrac{\Big(\dfrac{Q}{A}\Big)}{e_o}\)

\(4.0*10^{6} = \dfrac{\Big(\dfrac{Q}{0.022}\Big)}{8.85*10^{-12}}\)

\(4.0*10^{6}*8.85*10^{-12} = {\Big(\dfrac{Q}{0.022}\Big)}{}\)

\(Q= 4.0*10^{6}*8.85*10^{-12}*0.022\)

Q = 7.788 × 10⁻⁷ C

Q = 779 nC

Answer:

The volume is  \(V =5.32 *10^{-5} \ m^3\)

Explanation:

From the question we are told that

    The power of the heating element is \(P = 2.0 kW = 2.0 *10^3 \ W\)

    The temperature of the water in the kettle is  \(T _w = 100^oC\)

     The time to convert water to steam is t = 1 minute = 60 sec

      The specific latent heat of vaporization is \(H_v = \ 2,257,000 J/kg\)

      The density of water is \(\rho_w = 1000\ kg/m^3\)

The power of the heating element is mathematically represented as

      \(P = \frac{E}{t}\)

Where E  Energy generated by the heating element in term of heat

      \(E = Pt\)

substituting values

      \(E = 2.0 *10^{3} * 60\)

      \(E = 120000 J\)

Now

 The latent heat of vaporization is mathematically represented as

         \(H_v = \frac{E}{m}\)

Where m is the mass of water converted to steam

 So

      \(m = \frac{E}{H_v}\)

substituting values

      \(m = \frac{120000}{2257000}\)

     \(m = 0.0532\ kg\)

The volume of water converted to steam is mathematically evaluated as

    \(V = \frac{m }{\rho_w}\)

substituting values

   \(V = \frac{0.0532}{1000}\)

    \(V =5.32 *10^{-5} \ m^3\)

Answer:

natural convection

............

(i) The pressure due to 25m of water is 250,000 Pa.

(ii) The atmospheric pressure is 100,000 Pa.

Pressure can be defined as the force per unit area of an object.

Mathematically, the formula for pressure of an object is derived as;

P = F/A

where;

P = (mg) / (V/h)

P = (mgh) / V

P = (m/V)gh

where;

Density of an object or a substance is known as mass per unit volume of the substance.

P = (ρ)gh

where;

The pressure due to 25m of water is calculated as follows;

pressure = (ρ)gh

pressure = 1000 kg/m³   x   10 N/kg    x    25 m
pressure = 250,000 Pa

The atmospheric pressure is calculated as;

P(atm) = P(total) - P(water)

P(atm) = 350,000 Pa  -  250,000 Pa

P(atm) = 100,000 Pa

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The velocity of the egg thrown off the tall building just before hitting the ground is 22.41m/s.

The final velocity of the egg can be determined using the third equation of motion;

v² = u² + 2gs

Where v is final velocity, u is initial velocity, s is distance and g is acceleration due to gravity. ( g = 9.8m/s² )

Given the data in the question;

To determine the final velocity of the egg just before hitting the ground, plug the given values into the third equation of motion and solve for v.

v² = u² + 2gs

v² = (3.5)² + ( 2 × 9.8 × 25 )

v² = 12.25 + 490

v² = 502.15

Take the square root of both sides

v = √502.15

v = 22.41m/s

The velocity of the egg thrown off the tall building just before hitting the ground is 22.41m/s.

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d. An object did work on the environment.

Work is defined in many contexts. Some of these are;

i. Work is the product of force and displacement. In this case, work done is positive if the force applied on an object or body and the displacement caused by the force are in the same direction. If instead the force and displacement are in opposite direction, then the work done will be negative. If it is the case the force and the displacement are perpendicular to each other, the work done is zero.

ii. In the first law of thermodynamics, the internal energy of a system is the sum of the work done and the heat exchanged between the system and the environment. Therefore, work done is the difference between the internal energy of a system and the heat exchanged between the system and the environment.

In this case, work is said to be positive if work is done by the system (object) on the environment. It is negative if work is done by the environment on the system (object).

Answer:

its c

Explanation:

Answer:

number 3

Explanation:

3 represents runoff

Runoff is the water collected after rainfall that drains from the surface area of land. It will be tricky to choose 4 which is likely a smaller waterbody draining to a bigger waterbody

hope it helped

Answer:

That right there is what caused the world to end my friend

Explanation:

Answer:

Explanation:

work done=force*displacement

=350N*15m

=5250 joule

The specific heat capacity of the metal, given that 27.777 g of water at 22.1 °C was mixed with the metal is 9.7×10⁻² Cal/gºC

Step 1: Obtain the heat absorbed by the water. This is shown below:

Q = MCΔT

= 27.777 × 1 × 7.2

= 199.9944 Cal

Step 2: Determine the specific heat capacity of the metal using the heat absorbed by the water. Details below:

Q = MCΔT

-199.9944 = 29.292 × C × -70.6

-199.9944 = -2068.0152 × C

Divide both sides by -2068.0152

C = -199.9944 / -2068.0152

= 9.7×10⁻² Cal/gºC

Thus, the specific heat capacity of the metal is 9.7×10⁻² Cal/gºC. None of the options are correct.

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A.) a bond that forms when electrons are transferred from one atom to another

Ex:-NaCl

Answer: By dividing airflow by duct cross section.

Explanation:

In short, air velocity in the ducts is calculated by dividing airflow by duct cross-section. Airflow is expressed as a simple number. Example: Air conditioner has a max. airflow of 600 CFM.

The mass of the picture is approximately 5.19 kilograms.

The deformation in this case is called shear deformation, a type of deformation that occurs when parallel internal surfaces slide past one another. It is caused by shear stress in the structure. The shear stress (τ) is the force (F) applied divided by the cross-sectional area (A) of the nail. The shear strain (γ) is the displacement (Δx) divided by the original length (L0).

The relationship between shear stress and shear strain is given by the shear modulus (G) in the formula:

τ = G * γ

To find the weight of the picture, we need to calculate the shear stress first:

The cross-sectional area A of the nail is given by the formula for the area of a circle:

A = πr² = π(d/2)² = π(0.0015 m / 2)² = 1.767 x 10^-6 m².

The shear strain γ is given by:

γ = Δx / L0 = (1.80 x 10^-6 m) / (5 x 10^-3 m) = 0.36.

The shear stress τ can now be calculated by rearranging the formula:

τ = G * γ

=> τ = (80 x 10^9 N/m²) * 0.36 = 28.8 x 10^9 N/m²

The force F on the nail is equal to the weight w of the picture, and it can be calculated from the shear stress:

τ = F / A

=> F = τ * A = (28.8 x 10^9 N/m²) * (1.767 x 10^-6 m²) = 50.89 N.

Since weight w = m * g, where m is mass and g is the acceleration due to gravity (approximately 9.81 m/s²), we can find the mass m:

m = w / g = (50.89 N) / (9.81 m/s²) = 5.19 kg.

So, the mass of the picture is approximately 5.19 kilograms.

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Answer:

Half

Explanation:

If the half life of an isotope is 20 years, then half of the original amount will  remain after 20 years has passed.

That's what "half-life" means.

Similarly, after ANOTHER 20 years, 1\4 of the original amount remains.

And after ANOTHER 20 years, 1\8 of the original amount remains.

And after ANOTHER 20 years, 1\16 of the original amount remains.

And after ANOTHER 20 years, 1\32 of the original amount remains.

And after ANOTHER 20 years, 1\64 of the original amount remains.

And after ANOTHER 20 years, 1\128 of the original amount remains.

Answer:

Money is transferred from your account to creditors' accounts

Explanation:

When performing online activities that require payments of bills on a computer. The very moment you decided to pay your bills using a computer, your money will be transferred immediately from your account to creditors' accounts. This will imply that the transaction is successful and you have paid your bills.

Hence, in this case, the correct answer is "Money is transferred from your account to creditors' accounts."

Answer:

U become g**

Explanation:

Ur a**

Answer:

0.667 cm

Explanation:

|F_1on3| = |F_2on3|

k×q1×q3/x^2 = k×q2×q3/(d-x)^2

q1/x^2 = q2/(d-x)^2

(d-x)^2/x^2 = q2/q1

(d-x)/x = sqrt(q2/q1)

(2 - x)/x = sqrt(4×q/q)

(2 - x)/x = 2

2 - x = 2x

2 = 3x

x = 2/3

x= 0.667 cm

This question is incomplete, the complete question is;

Two plane mirrors intersect at right angles. A laser beam strikes the first of them at a point 11.5 cm from their point of intersection, as shown in the figure.

For what angle of incidence at the first mirror will this ray strike the midpoint of the second mirror (which is 28.0 cmcm long) after reflecting from the first mirror

Answer: angle of incidence is 39.4°

Explanation:

Given that;

two plain mirrors intersect at right angle (90°)

distance d = 11.5 cm

S = 28.0 cm

Now the angle that the reflection ray males with first the mirror equal theta  (∅)

so

tan∅ = (S/2) / d

tan∅ = (28/2) / 11.5

tan∅ = 14 / 11.5

tan∅ = 1.2173

∅ = tan⁻¹ (1.2173)

∅ = 50.6°

so angle of incidence = 90° - ∅

= 90° - 50.6°

= 39.4°

Therefore angle of incidence is 39.4°

S= 1.167W Due to the fact that the scale reads W when the elevator is stationary, the real weight of a man is (W = mg) acting downward. Apply Newton's second equation of motion to the elevator now traveling upward with an acceleration of a = g/6.

Explain the principles of acceleration:

Acceleration is the rate at which the speed and direction of a moving object change over time. A point or item is moving ahead in a straight line whether it is moving faster or slower.

An item has positive acceleration if it is accelerating and travelling in the right direction. Positive acceleration was demonstrated in the first case by the fast automobile. The automobile is speeding up and moving forward in a good way.

S= ma + W

S = m*g/6 + W

S = mg/6 +W

S = W/6 + W

S = 7W/6

S = 1.167W

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Answer:

true

Explanation:

Given :

Brandon hits a golf ball with an initial velocity of 30 m/s at an angle of 30 above the horizontal.

To Find :

How long is it in the air.

Solution :

We know, the formula of time of flight is :

\(T = \dfrac{2usin\ \theta}{g}\\\\T = \dfrac{2\times 30\times sin\ 30^o}{9.8}\\\\T = 3.06\ seconds\)

Therefore, the ball is in air for 3.06 seconds.

Answer:

\(W_{by}=9.00 \times 10^4 \ J\\\\W_{on}=-9.00 \times 10^4 \ J\)

Option (c) is correct.

Explanation:

\(\boxed{\left\begin{array}{ccc}\text{\underline{Work done on/by a gas:}}\\W_{by}=P \Delta V \ or \ \int\limits^{V_f}_{V_0} {P} \, dV \\W_{on}=-P\Delta V \ or \ -\int\limits^{V_f}_{V_0} {P} \, dV \end{array}\right }\)

Given:

\(P=1.8 \times 10^5 \ Pa\\\\V_0=1.2 \ m^3\\\\V_f=1.7 \ m^3\)

Find:

\(W_{by}=?? \ J\\\\W_{on}=?? \ J\)

(1) - Calculating the change in volume

\(\Delta V= V_f-V_0\\\\\Longrightarrow \Delta V=1.7-1.2\\\\\therefore \boxed{\Delta V=0.5 \ m^3}\)

(2) - Calculating the work done by the gas

\(W_{by}=P \Delta V\\\\\Longrightarrow W_{by}=(1.8 \times 10^5)(0.5)\\\\\therefore \boxed{\boxed{W_{by}=9.00 \times 10^4 \ J}}\)

(3) - Calculating the work done on the gas

\(W_{on}=-P \Delta V\\\\\Longrightarrow W_{on}=-(1.8 \times 10^5)(0.5)\\\\\therefore \boxed{\boxed{W_{on}=-9.00 \times 10^4 \ J}}\)

Options (a) and (d) can be eliminated. Option (b) can be eliminated since there is no negative in front of the answer. This leaves the correct answer being option (c).

Answer:

4.41N or 4.5N (check explanation)

Explanation:

450g = 0.45kg

F = ma

Using 10m/s² = 10(0.45) = 4.5N

Using 9.8m/s² = 9.8(0.45) = 4.41N

Answer:

the suppose the widtge frist is 6.5 inches and the lenth of your arm is 320 and 500

Answer:

The formula for potential energy depends on the force acting on the two objects.

Answer:

In the free fall motion we have that the acceleration is constant and produced by gravity, this acceleration has a magnitude of 32 ft/s2 or 9.8 m/s2 depending on the units you are working with. This means that every second the speed changes a magnitude of 32 ft/2, the velocity will depend of whether the ball is going upward (positive) or downward (negative).

A) At the highest point the ball stops to start the descend, here v=0 ft/s

B) +32 ft/s. The vector is going up, in the next second the velocity is going to be 0 (negative acceleration)

C) V=vf-vo=0-32=-32 ft/s is the constant change in velocity in projectile motion

D) -32 ft/s. The vector is pointing downward

E) V=vf-vo=-32-0=-32 ft/s is the constant change in velocity in projectile motion, 32 ft/s per second

F) Delta V=vf-vo=-32-32=-72 ft/s

g) gravity acceleration is constant 32 ft/s2 (pointing downward vector)

Answer:

The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest. This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you

Explanation:

The hypothesis about the movement of the galaxy is that galaxies are moving far from each other continuously.

The milky way galaxy is a galaxy that contains over a hundred billion stars and it also includes our solar system.  Its name describes its appearance when viewed from the earth. All the individual stars in the whole sky are a portion of the Milky Way Galaxy, the term "Milky Way" is because of the band of light.

The astronomer has discovered a new galaxy which means our universe is continuously expanding. This is because the universe encloses everything that exists.

Galaxies are moving in space and since the universe space is continuously expanding so the galaxies continuously move from each other. The farther the galaxy is from the milky way which is an observable part, the faster will be moving the galaxy and the closer the galaxy is to the milky way, the slower will be movement of the galaxy.

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An item at rest will remain at rest, and an object in motion will continue to move in a straight path at a constant speed, according to the first law of motion, commonly known as the law of inertia.

Newton's laws of motion govern how a baseball moves as a result of being thrown or struck. According to Newton's first law, a moving ball will continue to move in a straight line until other forces are acting on it.

The ball is severely distorted by the enormous force the bat applies to it ball being struck. The average force acting during the bat-ball collision is therefore about two tons, with a peak force of nearly four tons, during the 0.7 millisecond contact time. There's a lot of force there!

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Answer:B

Explanation: The book is thinner making magnets attraction stronger, making the paper clip harder to move

The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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