Four people participate in a rope competition. Two of them pull the rope right exerting forces of magnitude 330 N and 380 N. The other two pull left exerting forces of magnitude 320 N and 410N.

Answer:

e

Explanation:

Answer: E B

Explanation:

Answer:

0

Explanation:

The initial velocity of an object is 15 m/s when it was thrown straight up into the air.

At maximum height, the velocity of the object is equal to 0. It starts coming  downward after that and falls ground. Height attained by the object is given by :

\(h=\dfrac{v^2}{2g}\)

Hence,  its velocity at the peak of its flight is equal to 0.

Answer:

kinetic energy

Explanation:

A free neutron, or one that has not been incorporated into a nucleus, can experience beta decay, a type of radioactive decay. It splits apart into a proton-sized particle.

The sudden release of energy and subatomic particles is a property of some types of matter known as radioactivity. It is, in effect, a property of specific atomic nuclei. Both their synthetic isotopes and their naturally occurring counterparts show the property of radioactive decay.

In the 2019 British factual drama picture Radioactive, starring Rosamund Pike and directed by Marjane Satrapi, Jack Thorne plays Marie Curie. The 2010 children's novel Radioactive: Maria & Pierre Curie: A Story of Love and Fallout by Lauren Redniss served as the inspiration for the film.

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Answer:

neither A nor B

Explanation:

There are a lot of reasons, quite handful of them. About why scientists repeat experiments.

They do so sometimes to persistently verify the results they have gotten. Another reason is so as to be able to study and improve them in other ways.

This is just 2 of the very many reasons why scientists repeat experiments. Remember the popular saying, that practice makes perfect? yeah, that's just it

I hope you understand. Thanks

Answer:

The question has too wide of a focus, as though all situations can be studied at once.

Explanation:

Answer:

d = 1.24 kg/m³

v = 0.81 m³/kg

Explanation:

To do this, we need to analyze the given data and know the expressions we need to use here to do calculations.

We have a pressure of 1.05 atm and 300 K of temperature. To determine the density, we need to use a similar expression of an ideal gas. In this case, instead of using moles, we will use density:

P = dRT

d = P/RT  (1)

Where:

R: universal constant of gases

d: density.

From here we can determine the specific volume by using the following expression:

v = 1/d   (2)

Now, as we are looking for density, we need to convert the units of pressure in atm to Pascal (or N/m) and the conversion is the following:

P = 1.05 atm * 1.013x10⁵ N/m atm = 106,365 N/m

Now, using R as 287 the density would be:

d = 106,365 / (287 * 300)

Finally the specific volume:

v = 1 / 1.41

Hope this helps

The silver would be coolest since it has the lowest heat capacity.

Heat capacity, also known as thermal capacity, is the amount of heat energy required to raise the temperature of a substance by a certain amount. It is expressed as the amount of heat energy per unit temperature change, and is usually measured in joules per kelvin (J/K) or calories per degree Celsius (cal/°C).

Heat capacity is a key property of materials that provides important information about their thermal behavior and is critical for many areas of science and technology.

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(a) The course of the aeroplane is 234.3 km/h at 78⁰.

(b) The time  taken for the aeroplane to fly across is 2.5 hours.

The course of the aeroplane is calculated as follow;

Total vertical velocity = 220 km/h x sin(110) + 35 km/h x sin (40)

Total vertical velocity = 229.23 km/h

Total horizontal velocity = 220 km/h x cos(110) + 35 km/h x cos (40)

Total horizontal velocity = -48.43 km/h

The resultant velocity of the aeroplane is calculated as;

v = √ ( 229.23² + ( -48.43)² )

v = 234.3 km/h

The direction of the aeroplane

θ = arc tan ( Vy / Vx )

θ = arc tan ( 229.23 / 48.43 )

θ = 78⁰

The time of motion of the aroplane is calculated as follows;

t = ( 600 km ) / ( 234.3 km/h )

t = 2.5 hours

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1) The force acting on the object during the time interval 0-3 seconds is 1/3 N.

2) The force acting on the object during the time interval 6-10 seconds is -0.5 N.

3) There is no time interval in which no force acts on the object.

(i) Force acting on the object in time interval 0-3 seconds. Force acting on the object is equal to the product of its mass and acceleration, i.e.,F = ma.

In the given velocity-time graph, the acceleration of the object can be determined by determining the slope of the velocity-time graph from 0 to 3 seconds.

Slope = (change in velocity) / (change in time)= (20-0) / (3-0) = 20/3 m/s^2

Acceleration, a = slope= 20/3 m/s^2

Mass of the object, m = 50 g = 0.05 kg

∴ Force acting on the object, F = ma= 0.05 × 20/3= 1/3 N.

Therefore, the force acting on the object during the time interval 0-3 seconds is 1/3 N.

(ii) Force acting on the object in time interval 6-10 seconds. Similar to the first question, the force acting on the object in time interval 6-10 seconds can be determined by determining the acceleration of the object during this time interval.

The slope of the velocity-time graph from 6 seconds to 10 seconds can be determined as follows:

Slope = (change in velocity) / (change in time)= (-20-20) / (10-6) = -40/4= -10 m/s^2 (negative sign indicates that the object is decelerating)

Mass of the object, m = 50 g = 0.05 kg

∴ Force acting on the object, F = ma= 0.05 × (-10)= -0.5 N.

Therefore, the force acting on the object during the time interval 6-10 seconds is -0.5 N.

(iii) Time interval in which no force acts on the object. There is no time interval in which no force acts on the object. This is because, as per Newton's first law of motion, an object will continue to remain in a state of rest or uniform motion along a straight line unless acted upon by an external unbalanced force.In other words, if the object is moving with a constant velocity, there must be a force acting on the object to maintain its motion.

Therefore, there is no time interval in which no force acts on the object.

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Answer:

A object having kinetic energy is in motion state.And the object whi posses potential energy i s in state of podition.

Answer:

Objects are relative to other moving and stationary objects.

Kinetic energy can be transferred from one moving object to another.

Potential energy is stored energy in an object.

Answer:

Explanation:

it's c

Answer:

a) Time it will taken for the column surface temperature to rise to 27°C is  

17.1 hours

b) Amount of heat transfer is 5320 kJ  

c) Amount of heat transfer until the surface temperature reaches 27°C is 4660 kJ

Explanation:

Given that;

Diameter D = 30 cm

Height H = 4m

heat transfer coeff h = 14 W/m².°C

thermal conductivity k = 0.79 W/m.°C

thermal diffusivity α  = 5.94 × 10⁻⁷ m²/s

Density p = 1600 kh/m³

specific heat Cp = 0.84 Kj/kg.°C

a)

the Biot number is

Bi = hr₀ / k

we substitute

Bi = (14 W/m².°C × 0.15m) / 0.79 W/m.°C

Bi = 2.658

From the coefficient for one term approximate of transient one dimensional heat conduction The constants λ₁ and A₁ corresponding to this Biot number are,  

λ₁ = 1.7240

A₁ = 1.3915

Once the constant J₀ = 0.3841 is determined from corresponding to the constant λ₁

the Fourier number is determined to be  

[ T(r₀, t) -T∞ ] / [ Ti - T∞]  = A₁e^(-λ₁²t') J₀ (λ₁r₀ / r₀)

(27 - 28) / (14 - 28)   = (1.3915)e^-(17240)²t (0.3841)  

t' = 0.6771

Which is above the value of 0.2. Therefore, the one-term approximate solution (or the transient temperature charts) can be used. Then the time it will take for the column surface temperature to rise to 27°C becomes  

t =  t'r₀² / ₐ

= (0.6771 × 0.15 m)² /  (5.94 x 10⁻⁷ m²/s)

= 23,650 s

= 7.1 hours

Time it will taken for the column surface temperature to rise to 27°C is  

17.1 hours

b)

The heat transfer to the column will stop when the center temperature of column reaches to the ambient temperature, which is 28°C.  

Maximum heat transfer between the ambient air and the column is

m = pV

= pπr₀²L

= (1600 kg/m³ × π × (0.15 m)² × (4 m)

= 452.389 kg

Qin = mCp [T∞ - Ti ]

= (452.389 kg) (0.84 kJ/kg.°C) (28 - 14)°C

= 5320 kJ  

Amount of heat transfer is 5320 kJ  

(c)

the amount of heat transfer until the surface temperature reaches to 27°C is

(T(0,t) - T∞) / Ti - T∞  = A₁e^(-λ₁²t')

= (1.3915)e^-(1.7240)² (0.6771)

= 0.1860

Once the constant J₁ = 0.5787 is determined from Table corresponding to the constant λ₁, the amount of heat transfer becomes  

(Q/Qmax)cyl = 1 - 2((T₀ - T∞) / ( Ti - T∞)) ((J₁(λ₁)) / λ₁)

= 1 - 2 × 0.1860 × (0.5787  / 1.7240)  

= 0.875

Q = 0.875Qmax

Q = 0.875(5320 kJ)  

Q = 4660 kJ

Amount of heat transfer until the surface temperature reaches 27°C is 4660 kJ

The car is moving at approximately 12.5 meters per second.

The kinetic energy (KE) of an object can be calculated using the formula:

KE = 1/2 * m * \(v^2\)

where

KE = kinetic energy,

m =Mass of the object, and

v = velocity.

In this case, we are given the mass (m) of the car as 1600 kg and the kinetic energy (KE) as 125,000 J. To find the velocity .

Substituting the  values , we have:

125,000 J = 1/2 * 1600 kg *\(v^2\)

Now, we can solve for v by rearranging the equation:

\(v^2\) = (2 * 125,000 J) / 1600 kg

\(v^2\) = 156.25 \(m^2/s^2\)

Taking the square root, we find:

v = √156.25\(m^2/s^2\)

v ≈ 12.5 m/s

Therefore, the car is moving at approximately 12.5 meters per second.

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Vertical thrust = 8600 kg x 0.40 m/s/s = 3440 N

Answer:

A: Linear

Explanation:

Formula for Resistance of a metallic conductor is given as;

R = R_o(1 + αΔT)

Where;

R_o is the original resistance

R is the final resistance after change in temperature

ΔT is change in temperature

α is coefficient of linear expansion

Now, from the formula given, we can see that the change in resistance is directly proportional to the change in temperature.

Thus, the higher the final temperature, the more the change in resistance and the lower the final temperature, the lesser the change in resistance.

Thus, for temperature less than zero, since the change is resistance is directly proportional to the temperature, it means it follows a linear relationship.

Answer:

\(a_{c} = 13.46\ m/s^2\)

Explanation:

The motion of the tethered ball around the pole can be modeled as uniform circular motion. The acceleration of the objects executing uniform circular motion is due to the change in direction of their velocity. This is called centripetal acceleration. It is given by the following formula:

\(a_{c} = \frac{v^2}{r}\)

where,

ac = centripetal acceleration = ?

v = speed of ball = 3.5 m/s

r = distance of ball from center of rotation = 0.91 m

Using these values in equation, we get:

\(a_{c} = \frac{(3.5\ m/s)^2}{0.91\ m}\\\\a_{c} = 13.46\ m/s^2\)

Solution :

We all know that a bar magnet have two poles, the north pole and the south pole. These poles interacts with each other. The ends of the magnets having similar poles will push each other away while the poles with like charges will pull each others towards it.

The compass needle is also a magnet having south polarity as well as north polarity. When the compass needle is close to the bar magnet, it is opposite to the poles or along the poles. The compass needle shows the direction or is pointed towards the north. So when the compass needle is placed near the north pole of the bar magnet, the pointer of the compass needle points towards the north, i.e. it gets deflected because of he like charges. And when it is placed near the south pole of the magnet, it gets attracted towards it and is pointed towards the pole.

Now as we move the compass needle from the poles to the region that is between the poles, the compass needle pointer points towards the north direction every time. It show a deflection always. If we place the magnetic lines, we will see that the magnetic lines will exit from the north poles and enters the south pole of the bar magnet.  

We can calculate the time taken by the compass to hit the ground by using kinematic equations of motion. The motion of the compass is a free-fall motion since it is only under the influence of gravity. When the compass is dropped, it is initially at rest.

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Answer:

0.258 +- 0.0162

Explanation:

First change the uncertainty to percentage uncertainty :

%uncertainty =uncertainty /estimated value *100

0.1/51.6 * 100=0.19%

Do the same for the rest you will get:

0.1%, 1%, 5%

Then add the %uncertainties

0.19% + 0.1% + 1% +5%=6.29%

Find density:

51.6/10 * 100 * 0.20 = 0.258

Change the %percentage uncertainty to absolute uncertainty :

Absolute uncertainty = %uncertainty * the answer

6.29/100 * 0.258 = 0.0162

Answer = 0.258 +- 0.0162

After rounding:

0.26 +- 0.02

Answer:

The centripetal force remains constant.

Explanation:

The magnitude of centripetal force is given by the following formula:

F = mv²/r

where,

F = Centripetal Force

m = mass of the object

v = velocity of the object

r = radius of the circle

Now, if we quadruple the radius (r = 4r) and the speed is doubled (v = 2v). Then the centripetal force becomes:

F' = m(2 v)²/4r

F' = (4/4)(mv²/r)

F' = mv²/r

F' = F

Thus, the centripetal force remain constant.

When the radius of the circle is quadrupled and the speed is doubled, the centripetal force remains the same.

The given parameters:

The centripetal force applied to the object is calculated as follows;

\(F = \frac{mv^2}{r} \\\\Fr = mv^2\\\\\frac{Fr}{v^2} = m\\\\\frac{F_1r_1}{v_1^2} = \frac{F_2r_2}{v_2^2} \\\\F_2 = \frac{F_1 r_1v_2^2}{r_2v_1^2}\)

When the radius of the circle is quadrupled and the speed is doubled, the centripetal force becomes;

\(F_2 = \frac{F_1 r_1v_2^2}{r_2v_1^2} \\\\F_2 = \frac{F_1 \times r_1 \times (2v_1)^2}{4r_1 \times v_1^2} \\\\F_2 = \frac{F_1 \times r_1 \times 4v_1 ^2 }{4r_1 \times v_1^2} \\\\F_2 = F_1\)

Thus, when the radius of the circle is quadrupled and the speed is doubled, the centripetal force remains the same.

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Answer:

stress,depression and anxiety by improving self esteem.

Answer: the answer would be b in k12

Explanation:

Answer:

Electromagnetic waves are formed when an electric feild meets a magnetic feild. They travel through space by changing back and forth between these feilds.

Answer:Electromagnetic waves are created by a charged particle.

An electric field creates a magnetic field.

The interaction between the changing electric field and magnetic field causes the wave to move.

Explanation:

Answer:

Explanation:

It takes up no space and acts uniformly on its surroundings.

Given a point charge, or a particle of infinitesimal size, that contains a certain charge, electric field lines emanate from equally in all radial directions. If the point charge is positive, field lines point away from it; if the charge is negative, field lines point toward it.

Answer: C. gamma waves.

Explanation:

:)