You want to be shielded from all three types of nuclear radiation. If you find shielding that blocks radiation, then it will most likely also block the other two types.

When the charge on both the given objects is doubled, Coulomb's Law indicates that the electrostatic force will become four times greater, resulting in a new force of 8F.

The original question asks about the effect on electrostatic force between two charged objects if both of their charges are doubled.

In the given situation, if we double the charge on both objects (from +2Q to +4Q and from +1Q to +2Q), then the product of the charges becomes 4 times greater because (4Q * 2Q) is 4 times (2Q * 1Q).

Therefore, if the force was initially measured as 2F, after doubling both charges, the force will become 4 times bigger, which is 8F.

This is represented by the option: c.

Answer:

The hiker followed a road heading north for 2 miles in 30 minutes.

Explanation:

In order to describe the motion of an object, distance covered and time taken must be required. The total path covered by an object is called the distance travelled.

The hiker followed a road heading north for 2 miles in 30 minutes. This describes the motion of hiker. The motion shows how fast the hiker is moving.  

Distance, d = 2 miles = 3218.6 m

times, t = 30 minutes = 1800 seconds

So, we can say that the hiker is moving with a speed of 1.78 m/s in north direction.

Hence, this is the required solution.

Answer:

In this case in option 4:

The hiker followed a northbound road for 2 miles in 30 minutes.

Explanation:

Hello ! Let's solve this!

To know the description of a movement we have to know the distance it travels and the time it takes to travel it.

In this case in option 4:

The hiker followed a northbound road for 2 miles in 30 minutes.

Distance: 2 miles

time: 30min

Then we can calculate the speed of the hiker

The initial speed of the bullet can be determined using the principles of conservation of momentum and the work-energy theorem. Conservation of momentum gives us the velocity of the block and bullet after collision, and the work-energy theorem using the friction force and the distance gives us the velocity.

This question can be solved using the principles of conservation of momentum and the work-energy theorem. Using conservation of momentum before and after the collision, we can put: Momentum before = Momentum after. Therefore, (mass of bullet * velocity of bullet) = (total mass * velocity after). This gives us the velocity of the block and bullet together. From the work-energy theorem, work done = change in kinetic energy. Or, friction force * distance = 1/2 * mass * (velocity)^2. But friction force = mass * gravity * coefficient of friction, which gives us the equation 0.20 * 9.01 * 9.81 * 0.05 = 1/2 * 9.01 * (velocity)^2. Solving the equations together will give you the initial speed of the bullet.

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SI (International System of Units) is a consistent system in mathematics because it provides standard and consistent measurements based on fundamental constants of nature.

In mathematics, SI (International System of Units) is considered a consistent system because it provides a standard and consistent way of measuring physical quantities such as length, mass, time, and temperature.

SI units are based on fundamental constants of nature and are internationally recognized and used. For example, the meter is defined as the distance traveled by light in a vacuum during a specific time interval.

Consistency in SI units allows for easy comparisons, calculations, and communication across different scientific disciplines and countries.

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The time taken by the ball to reach the batter is 0.42 seconds

The baseball pitcher throws a fastball at 42 m/s

The batter is about 18 meters from the pitcher

Therefore the time for the ball to reach the batter can be calculated as follows;

= 18/42

= 0.42 secs

Hence the time taken by the ball to reach the batter is 0.42 seconds

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Answer: Option (a) is the correct answer.

Explanation:

Metals are the substance which have excess of electrons. Therefore, they are good conductors of heat and electricity as they have mobile electrons.

Out of the given options, iron is a transition metal which are good conductors of heat and electricity.

Sulfur and carbon are non-metals, therefore, they are bad conductors of heat and electricity.

Tin is a poor metal so it will not conduct electricity effectively as compared to iron.

Thus, we can conclude that out of the given options, iron is likely to be the best conductor.

Answer:

D

Explanation:

it is the correct answer on usa test prep

The work done by nonconservative forces in stopping the 17,000-kilogram airplane landing at a speed of 82 m/s is 57,062,000 Joules. This is calculated by the change in kinetic energy of the airplane when it lands and comes to a stop.

The question refers to the concept of work-energy theorem in Physics, especially involving non-conservative forces. The airplane is initially moving and finally comes to rest. Its initial kinetic energy (KE) gets transferred to work done by nonconservative forces, which in this scenario includes friction due to the aircraft carrier deck and air resistance.

The initial kinetic energy of the plane is calculated using the formula 1/2 * m * v^2 where 'm' is the mass of the plane and 'v' is its speed. So, the initial kinetic energy of the plane is 1/2 * 17,000 kg * (82 m/s)^2 = 57,062,000 Joules. When the plane comes to rest, its final kinetic energy is 0. As per the work-energy theorem, the work done by nonconservative forces is equal to the change in the kinetic energy. Therefore, the work done by nonconservative forces in stopping the plane = Initial KE - Final KE = 57,062,000 Joules - 0 = 57,062,000 Joules.

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The work done by nonconservative forces in stopping the airplane is  [tex]{57,154,000 \, \text{J}}[/tex].

To find the work done by nonconservative forces (like friction and air resistance) in stopping the airplane, we can use the work-energy principle. The work done by the nonconservative forces is equal to the change in the kinetic energy of the airplane.

Step-by-Step Solution

1. Calculate the initial kinetic energy ([tex]KE_{\text{initial}}[/tex]):

[tex]KE_{\text{initial}} = \frac{1}{2} m v^2[/tex]

where:

- m is the mass of the airplane (17,000 kg),

- v is the initial speed (82 m/s).

[tex]KE_{\text{initial}} = \frac{1}{2} \times 17,000 \, \text{kg} \times (82 \, \text{m/s})^2 \\\\KE_{\text{initial}} = \frac{1}{2} \times 17,000 \times 6,724 \\\\KE_{\text{initial}} = 57,154,000 \, \text{J}[/tex]

2. Calculate the final kinetic energy ([tex]KE_{\text{final}}[/tex]):

Since the airplane comes to a stop, its final speed is 0 m/s.

[tex]KE_{\text{final}} = \frac{1}{2} m (0)^2 = 0 \, \text{J}[/tex]

3. Calculate the change in kinetic energy (ΔKE):

[tex]\Delta KE = KE_{\text{final}} - KE_{\text{initial}} \\\\\Delta KE = 0 \, \text{J} - 57,154,000 \, \text{J} \\\\\Delta KE = -57,154,000 \, \text{J}[/tex]

4. The work done by nonconservative forces (W):

The work done by nonconservative forces is equal to the negative of the change in kinetic energy (since they are doing work to stop the airplane).

[tex]W = -\Delta KE \\\\W = -(-57,154,000 \, \text{J}) \\\\W = 57,154,000 \, \text{J}[/tex]

Therefore, the work done by nonconservative forces in stopping the airplane is [tex]{57,154,000 \, \text{J}}[/tex] .

Final answer:

The torque about the center of the Sun due to the Sun's gravitational force on a planet is effectively zero, as the force provides centripetal force for the planet's orbit, not rotational force.

Explanation:

The question asked relates to the field of Classical Mechanics within Physics, particularly regarding the calculation of torque due to gravitational forces. In classical mechanics, torque is the measure of the force that can cause an object to rotate about an axis. The torque (τ) can be calculated by the cross product of the radius vector (r) from the axis of rotation to the point of force application and the force vector (F), τ = r x F. However, in the context of a planet orbiting the Sun, the force of gravity provides centripetal force causing the planet to move in a circular path and does not contribute to the planet spinning or rotating about its own axis. Therefore, the torque about the center of the Sun due to the Sun's gravitational force on a planet is effectively zero.

Correct answer choice is :

C) It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation:

A bromide is a synthetic composite including a bromide ion or ligand. Potassium bromide (KBr) is a salt, usually selected as an anticonvulsant and a drug in the late 19th and early 20th centuries, with over the stand value increasing to 1975 in the US. Potassium bromide is applied as a veterinary drug, as an antiepileptic medicine for dogs.

C. It is a negative ion that has one more valence electron than a neutral bromine atom.

Strength of Electromagnet increases when either the "Current" or "Number of turns in a coil" increases.

They are directly proportional to strength of Electromagnet.

Explanation:

To compile, the power or intensity of a coils magnetic field depends on the following circumstances. The number of turns of wire within the coil. The amount of current running in the coil. An electromagnet is a temporary magnet; the magnetic field only survives when an electric current is running through it. The power of the electromagnet depends on how many coils you wind around and how great the voltage is.

Answer:

Initial speed of football=14.11m/s

Explanation:

Range is the horizontal distance travelled. Therefore using formular for Range,R to determine the speed.

R=V^2Sin2theta/g

Given: R=20m

Theta=50°

20= V^2 Sin(2×50)°/ 9.8

Cross multiply

20×9.8 = V^2 Sin100°

196= V^2×0.9848

V=Sqrt(196/0.9848)

V= 14.11m/s

The equilibrium concentration of A is [tex]\boxed{\frac{1}{3}}[/tex].

The equilibrium concentration of B is [tex]\boxed{\frac{1}{3}}[/tex].

The equilibrium concentration of C is [tex]\boxed{\frac{2}{3}}[/tex].

Further explanation:

Chemical equilibrium is the state in which the concentration of reactants and products become constant and do not change with time. This is because the rate of forward and backward direction becomes equal. The general equilibrium reaction is as follows:

 [tex]{\text{A(g)}}+{\text{B(g)}}\rightleftharpoons{\text{C(g)}}+{\text{D(g)}}[/tex]

The equilibrium constant is the constant that relates the concentration of product and reactant at equilibrium. The formula to calculate the equilibrium constant for the general reaction is as follows:

[tex]{\text{K}}=\dfrac{{\left[ {\text{D}}\right]\left[{\text{C}}\right]}}{{\left[{\text{A}} \right]\left[{\text{B}}\right]}}[/tex]

Here, K is the equilibrium constant.

The given reaction is,

[tex]{\text{aA}}\left( g \right)+{\text{bB}}\left( g \right) \rightleftharpoons{\text{cC}}\left( g \right)[/tex]

Here,

A and B are the two reactants.

C is the product formed.

a and b are the stoichiometric coefficients of A and B respectively.

c is the stoichiometric coefficient of C.

The expression of [tex]{{\text{K}}_{\text{c}}}[/tex] for the above reaction is as follows:  

[tex]{{\text{K}}_{\text{c}}}=\dfrac{{{{\left[{\text{C}}\right]}^{\text{c}}}}}{{{{\left[{\text{A}} \right]}^{\text{a}}}{{\left[{\text{B}}\right]}^{\text{b}}}}}[/tex]   ...... (1)

Here,

[tex]{{\text{K}}_{\text{c}}}[/tex] is the equilibrium constant that is concentration-dependent.

Let the change in concentration at equilibrium is x. Therefore, the concentration of C becomes x at equilibrium. The concentration of A and B become 1-x at equilibrium.

Substitute x for [C] , 1-x for [A] and 0.57-x for [B], 1 for a, 1 for b and 2 for c in equation (1).

[tex]{{\text{K}}_{\text{c}}}=\dfrac{{{{\left[ {\text{x}} \right]}^2}}}{{{{\left[{{\text{1 - x}}} \right]}^{\text{1}}}{{\left[{{\text{1 - x}}}\right]}^{\text{1}}}}}[/tex]       ...... (2)

Rearrange equation (2) and substitute 4 for [tex]{{\text{K}}_{\text{c}}}[/tex] to calculate the value of x.

[tex]{{\text{x}}^2}=\dfrac{{{\text{8x}} - 4}}{3}[/tex]

The final quadratic equation is,

[tex]{\text{3}}{{\text{x}}^2}-8{\text{x}}+4=0[/tex]

Solve for x,

[tex]{\text{x}}={\text{2 , }}\dfrac{2}{3}[/tex]

The value of x equal to 2 is not accepted as it would make the equilibrium concentration of A and B negative, which is not possible. So the value of x comes out to be 2/3.

The equilibrium concentration of [C] is equal to 2/3.

The equilibrium concentration of A is calculated as follows:

[tex]\begin{aligned}\left[ {\text{A}}\right]&=1-\frac{2}{3}\\&=\frac{1}{3}\\\end{aligned}[/tex]

The equilibrium concentration of B is calculated as follows:

[tex]\begin{aligned}\left[ {\text{B}}\right]&=1-\frac{2}{3}\\&=\frac{1}{3}\\\end{aligned}[/tex]

So the equilibrium concentrations of A, B and C are 1/3, 1/3 and 2/3 respectively.

Learn more:

1. Calculation of equilibrium constant of pure water at 25°c: https://brainly.com/question/3467841

2. Complete equation for the dissociation of  (aq): https://brainly.com/question/5425813

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Equilibrium

Keywords: equilibrium constant, A, B, C, a, b, c, 1, 1, 2, 1/3, 1/3, 2/3, Kc, concentration dependent.

Radioactive dating, is your answer.

Final answer:

Using Newton's law of cooling, we can calculate that the beer will be approximately 60.4ºF if left out for 20 minutes.

Explanation:

To calculate the final temperature of the beer after being left out for 20 minutes, we can use Newton's law of cooling. This law states that the rate of heat loss of an object is proportional to the temperature difference between the object and its surroundings. In this case, the initial temperature of the beer is 40ºF and the room temperature is 70ºF. Let's determine the constant of proportionality, k, first:

k = (T2 - T1) / t = (70 - 40) / 3 = 10

Now we can use the formula to find the final temperature, T3, after 20 minutes:

[tex]T3 - 70 = (40 - 70)e^(-10(20/3))[/tex]

[tex]T3 - 70 = -30e^(-20/3)[/tex]

[tex]T3 = 70 - 30e^(-20/3)[/tex]

Using a calculator, we can find that T3 is approximately 60.4ºF.

Final answer:

The horizontal distance traveled by the bullet before hitting the ground is 600 meters.

Explanation:

To determine how far forward the bullet goes before it hits the ground, we can use the fact that both the horizontally fired bullet and the dropped bullet hit the ground after a certain time. The dropped bullet takes 4 seconds to reach the ground, so we can consider its vertical motion using the equation h = 0.5 * g * t^2, where h is the height, g is the acceleration due to gravity, and t is the time. Plugging in the values, we get 0 = 0.5 * 9.8 * 4^2, which gives us h = 78.4 meters.

Since the horizontally fired bullet has the same horizontal velocity as the dropped bullet, it would take the same time to reach the ground. This means that the horizontally fired bullet travels a horizontal distance equal to its horizontal velocity multiplied by the time it takes to reach the ground. Plugging in the values, we get d = 150 * 4 = 600 meters.

Therefore, the first bullet travels 600 meters forward before hitting the ground.

The bullet fired horizontally travels 600 meters before hitting the ground because it takes the same 4 seconds as the dropped bullet to reach the ground, and it travels at a horizontal velocity of 150 m/s.

Step-by-Step Explanation:

Conclusion:

The bullet fired horizontally travels 600 meters before it hits the ground.

Explanation:

Acceleration is defined as the change in velocity over time.

When there is an increment or increase in the magnitude of velocity of a moving body then it is known as positive acceleration.

Whereas when there is a decrease in magnitude of velocity of a moving body then it is known as negative acceleration.

Thus, we can conclude that positive acceleration occurs when an object speeds up.

The acceleration that leads to the increase in the speed of the object is called as Positive acceleration.

Explanation:

The acceleration of a body is defined as the amount of change taking place in the magnitude of the velocity of the body in every second. The acceleration of the body is a vector quantity as it requires the direction along with the magnitude of change in the speed of the body.

If the acceleration of the body is acting in the direction opposite to the direction of motion of the body, then the acceleration tends to decrease the speed of the body and it is called as deceleration.

Whereas if the acceleration of a body is in the direction same as that of the direction of motion of the body, then the acceleration of the body increases the speed of the body and this acceleration is termed as the positive acceleration of the body.

Therefore, the acceleration of an object that tends to speed up the object must be acting in the direction same as the direction of motion of the body and therefore it is termed as the positive acceleration of the body.

Thus, The acceleration that leads to the increase in the speed of the object is called as Positive acceleration.

Learn More:

1. Transnational kinetic energy brainly.com/question/9078768.

2.  Motion under friction brainly.com/question/7031524.  

3. Conservation of momentum brainly.com/question/9484203

Answer Details:

Grade: High School

Subject: Physics

Chapter: Acceleration

Keywords:

acceleration, rate of change, velocity, speed, increase, per second, direction, opposite, motion, along, speed up.