True or false? Pls help

Answer:

B. 380 ± 10 Ω

Explanation:

The resistance can be calculated using the following equation

R = V/I

Where V = 2.00 ± 0.02 V and I = 5.3 ± 0.1 mA

First, we need to convert 5.3 ± 0.1 mA to A, so

5.3 ± 0.1 mA x 1 A/1000 mA = 0.0053 ± 0.0001 A

Then, we can calculate the resistance as

R = 2.0/0.0053 = 377.35 Ω

Now, we can calculate the uncertainity using the following equation:

Therefore, the approximate answer is

B. 380 ± 10 Ω

Answer:

Let distance between two cities is x km . So total distance travelled bus x+x=2x km and time taken was=(x/40)+(x/60)=(3x+2x)/120=5x/120=x/24 hrs . So avg speed is 2x/(x/24)=48 km per hr.

or

dt1=60km1h

dt2=30km1h

2dt1+t2=r¯

d=60t1

d=30t2

60t1=30t2

2t1=t2

2dt1+(2t1)=r¯

2(60t1)t1+2t1=r¯

2(60t1)=r¯(t1+2t1)

120=r¯+2r¯

r¯=1203

r¯=40km/h

Here are two examples of work done to store potential energy i.e. Lifting a weight, and stretching a spring.

1. Lifting a weight: When you lift a weight against the force of gravity, you are doing work to store potential energy in the weight. As you lift the weight, you are increasing its height above the ground, which increases its potential energy. The work you do to lift the weight is equal to the increase in potential energy of the weight.

2. Stretching a spring: When you stretch a spring, you are doing work to store potential energy in the spring. As you stretch the spring, you are increasing its length, which causes the spring to store potential energy. The work done you do to stretch the spring is equal to the potential energy stored in the spring.

In both of these examples, work is done to store potential energy in an object by changing its position or shape. This stored potential energy can be released later to do work on other objects, such as when a weight is dropped or a spring is released.

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The wavelength of this radio signal is equal to 3.18 meters.

Given the following data:

Wavelength can be defined as the distance between two (2) successive crests (troughs) of a wave.

Mathematically, the wavelength of a wave is given by this formula:

\(\lambda = \frac{V}{F}\)

Where:

Substituting the given parameters into the formula, we have;

\(\lambda = \frac{3 \times 10^8}{9.45 \times10^7}\)

Wavelength = 3.18 meters.

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The wavelength of the radio signal travel at speed of light is 3.17m.

Given the data in the question;

Wavelength the spatial period of a periodic wave. That is to say, when the shapes of waves are Wavelength , the distance over which they are repeated is called wavelength. Wavelength  is expressed as;

\(\lambda = \frac{v}{f}\)

Where \(\lambda\) is wavelength, f is the frequency of the wave and c is the velocity or speed of light ( \(c = 3*10^8m/s\) )

We substitute our values into the expression above.

\(\lambda = \frac{c}{ f}\\ \\\lambda = \frac{3*10^8m/s}{9.45*10^7s^{-1}} \\\\\lambda = \frac{3*10^8ms/s}{9.45*10^7}\\\\\lambda = 3.17m\)

Therefore, the wavelength of the radio signal travel at speed of light is 3.17m.

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Answer:

175(4) = 700 N

Explanation:

Answer:

An applied force, A resistive force

Explanation:

An applied force is an interaction of one object on another that causes the second object to change its velocity.

A resistive force passively resists motion and works in a direction opposite to that motion.

Answer:

Static electricity moves only once.

Explanation:

I took the quiz.

The true statement is that Static electricity can be an alternating current.

There are different kinds of power generating source. Static electricity is known to be the movement of static charges which are termed electrons from one point or surface to another.

Conclusively, It happens as a result of an imbalance in charge between the surfaces.

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The mass of the planet is  5.98 × 10^24 kg.

To calculate the mass of the planet, we can use Kepler's Third Law of Planetary Motion. This law states that the square of the period of revolution of a planet around the sun is directly proportional to the cube of the semi-major axis of its orbit.

First, we need to convert the period of the satellite's orbit to seconds. We know that there are 60 minutes in an hour, so the period can be expressed as (6 × 60 + 12) minutes, which equals 372 minutes. Multiplying this by 60 seconds, we get a period of 22,320 seconds.

Next, we need to find the semi-major axis of the orbit. In a circular orbit, the semi-major axis is equal to the radius of the orbit. Therefore, the semi-major axis is 8.8 × 10^6 m.

Now, we can apply Kepler's Third Law to calculate the mass of the planet. The formula is T^2 = (4π^2/GM) × a^3, where T is the period of revolution, G is the gravitational constant, M is the mass of the planet, and a is the semi-major axis of the orbit.

Rearranging the formula, we can solve for the mass of the planet:
M = (4π^2/G) × a^3 / T^2

Plugging in the values, we get:
M = (4 × π^2 / 6.67430 × 10^-11) × (8.8 × 10^6)^3 / (22,320)^2

Evaluating this expression, we find that the mass of the planet is approximately 5.98 × 10^24 kg.

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Answer:

the answer is false

Explanation:

plastic doesnt conduct anything

Answer:

Explanation:

for a.;

Kinetic molecular theory assumes the collision of particles with each other and walls of container as perfectly elastic, that is why no particle loses energy.

for b.;

Kinetic molecular theory assumes that particles are of very small size incomparison with the size of container and far apart from each other that is why their density is very low. because density is described as

Density = Mass/Volume

So, one can imagine that in a big container, entire mass of all gas particles is very low as compared to the volume of container. So the gas have very low density

For c.;

Gases assume shape of their container because they are freely moving with in a container

For d.;

For statement in "b", one can easily understand that because according to kinetic molecular theory, particles are very small and at great distances, so they are compressible against any external pressure applied

The front of the truck is designed to crumple during a collision to absorb the impact energy, slow down the collision, and protect the well-being of the passengers. This design feature helps increase the collision time, reduce the forces acting on the passengers, and minimize the risk of severe injuries.

Danica observes a collision between two vehicles. She sees a large truck driving down the road. It strikes a small car parked at the side of the road. On colliding, the truck applies a force on the stationary car, and the stationary car applies an opposite force on the truck. The front of the truck is designed to crumple in order to absorb the impact energy and slow down the collision , which protects the well-being of the passengers.

During a collision, the principle of Newton's third law of motion comes into play. According to this law, for every action, there is an equal and opposite reaction. In the case of the collision between the truck and the car, the truck exerts a force on the car, pushing it forward, while simultaneously experiencing an equal and opposite force from the car.

The purpose of designing the front of the truck to crumple is to increase the collision time and absorb the kinetic energy. When the truck collides with the stationary car, the front of the truck deforms, crumples, and absorbs a significant amount of the impact energy. This process increases the time over which the collision occurs, reducing the forces acting on the passengers and minimizing the risk of severe injuries.

By allowing the truck to crumple, the kinetic energy of the collision is transformed into other forms, such as deformation energy and heat. This energy transformation helps protect the passengers by reducing the deceleration forces acting on them. It also helps prevent the transfer of excessive forces to the car's occupants and reduces the likelihood of severe injuries.

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Answer: the angular velocity of a particle at the Earth's surface is approximately 7.27 x 10^-5 rad/s, and the linear velocity of the particle is approximately 464.1 m/s.

Explanation:

The acceleration of a 50 g object pushed with a force of 0.5 N is 10 m/s².

To find the acceleration of the object, we can use Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration:

F = m * a

Given:

Force (F) = 0.5 N

Mass (m) = 50 g = 0.05 kg

Substituting the given values into the equation, we have:

0.5 N = 0.05 kg * a

To find the acceleration (a), we rearrange the equation:

a = F / m

a = 0.5 N / 0.05 kg

a = 10 N/kg

Since acceleration is measured in meters per second squared (m/s²), we convert the unit of N/kg to m/s²:

1 N/kg = 1 m/s²

Therefore, the acceleration of the 50 g object pushed with a force of 0.5 N is 10 m/s².

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Answer:

Frequency of the wave = 2 x 10³ hz

Explanation:

Given:

Velocity of wave = 5 x 10⁴

Wavelength = 2.5 x 10¹

Find:

Frequency of the wave

Computation:

Frequency of the wave = Velocity of wave / Wavelength

Frequency of the wave = [5 x 10⁴] / [2.5 x 10¹]

Frequency of the wave = 2 x 10³ hz

The frequency of a wave traveling at 5.00 x 10⁴ meters per second and a wavelength of 2.50x10¹ meters is 2 × 10³ Hz

HOW TO CALCULATE FREQUENCY:

λ = v/f

Where,

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Answer:

To establish this relationship we must examine the potentials that these forces create. The electrical potential is described by

        Ve = k q / r

The potential for strong nuclear force is

       Vn (r) = - gs / 4pir exp (-mrc / h)

Where gs is the stacking constant and r the distance between the nucleons,

We can compare these potentials where the force is derived from the relationship

       E = -dU / dr

       F = q E

Explanation:

(a) Current in the upper branch is -0.4 A

(b) Current in the middle branch is 1.6 A

(c) Current in the lower branch is 1.2 A

Kirchhoff's current law states that, at a node, the current entering the circuit is equal to the current leaving the circuit. That means the sum of all currents at the node is zero.

Here,

According to Kirchhoff's current law,

I₁ + I₂ = I₃

Taking the clockwise direction from upper loop,

According to Kirchhoff's voltage law,

2I₁ -10 + 3I₁ - 4I₂ + 20 - I₂ = 0

5I₁ - 5I₂ = -10

I₁ - I₂ = -2

Taking clockwise direction from the lower loop,

According to Kirchhoff's voltage law,

-4I₂ + 20 - I₂ + 2I₂ - 10I₃ = 0

-5I₂ - 10I₃ = -20

Dividing by 5,

I₂ + 2I₃ = 4

So we get three equations,

I₁ + I₂ = I₃                 (1)

I₁ - I₂ = -2                 (2)

I₂ + 2I₃ = 4               (3)

From the above equations,

Adding (2) and (3), we get,

I₂ = 3I₃ - 2

Applying this in  eqn(3),

3I₃ - 2 + 2I₃ = 4

5I₃ = 6

I₃ = 1.2 A

So, I₂ = 3I₃ - 2 =3X 1.2 - 2

I₂ = 1.6 A

I₁ = -2 + I₂ = -2 + 1.6

I₁ = -0.4 A

Hence,

(a) Current in the upper branch is -0.4 A

(b) Current in the middle branch is 1.6 A

(c) Current in the lower branch is 1.2 A

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Answer:

A. boi-gas

Explanation:

This may help u

According to the Keynesian view, manipulating foreign sector spending is not a reliable way to move the U.S. economy toward a more acceptable equilibrium because it does not address the fundamental causes of economic instability.

Keynesian economics focuses on the role of domestic demand in driving economic growth and stability. The government can use fiscal and monetary policy to stimulate aggregate demand and promote full employment. However, changes in foreign sector spending can be unpredictable and beyond the control of domestic policymakers. For instance, an increase in foreign demand for U.S. exports could boost economic growth and employment in the short run, but it may not be sustainable if the foreign demand later decreases. Similarly, a decrease in foreign demand for U.S. exports could have negative short-term effects on the economy, but it may not necessarily lead to a long-term decline. In short, Keynesian economics emphasizes the importance of domestic demand management and stabilizing the economy through government intervention. While changes in foreign sector spending can have some impact on the economy, they are generally seen as unreliable and unpredictable, and therefore not a reliable tool for achieving economic stability in the long run.

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Answer:

C.) X-Rays

B.) Focus

A.) Laser

B.) 38 x 10^-16 Joules

Answer:

Explanation:

Use Archimedes' principle, that states something of this nature: "The buoyant force acting on an object immersed in a fluid is equal to the weight of the fluid displaced"

Say, you take a cube of wood(for example) and place it in a bucket of water. Your cube is bound to sink, until, the upthrust force equals its weight.

Where does this upthrust come from?

As the cube sinks, it displaced some volume of water(if the bucket were full you would see water pouring out)

Archimedes simply stated that: Upthrust,

U=mg

Answer:As relative density is the ratio of similar quantities, it has no unit.So RD remains the same in both CGS and SI unit

Explanation: i did the test

Answer:

4.06 seconds

148.3 meters

Explanation:

To solve for the time it takes for the projectile to hit the ground, we can use the following kinematic equation:

y = y_0 + v_0y * t + 1/2 * a_y * t^2

where y is the final height (0 m), y_0 is the initial height (also 0 m), v_0y is the initial vertical velocity, and a_y is the acceleration due to gravity (-9.8 m/s^2).

First, we need to find v_0y, the initial vertical velocity:

v_0y = v_0 * sin(theta) = 42 m/s * sin(28 degrees) ≈ 19.6 m/s

Now, we can solve for the time it takes to hit the ground:

0 = 0 + 19.6 m/s * t + 1/2 * (-9.8 m/s^2) * t^2

Simplifying and solving for t, we get:

t ≈ 4.06 seconds

Therefore, it takes about 4.06 seconds for the projectile to hit the ground.

To find the horizontal distance traveled by the projectile, we can use the following kinematic equation:

x = v_0x * t

where x is the horizontal distance traveled, v_0x is the initial horizontal velocity, and t is the time it takes to hit the ground (which we just calculated).

Since there is no air resistance, the horizontal velocity remains constant throughout the motion. Therefore:

v_0x = v_0 * cos(theta) = 42 m/s * cos(28 degrees) ≈ 36.5 m/s

Now, we can plug in the values to find the horizontal distance traveled:

x = 36.5 m/s * 4.06 s ≈ 148.3 meters

Take into account that the static friction supplies the centripetal force, then, you can write:

where,

m: mass of the truck = 1700 kg

v: speed of the truck = 20 m/s

r: turning radius = ?

Fr: maximum frictional force = 12,000 N

Solve the equation above for r, replace the values of the other parameters and simplify:

Hence, the turing radius of the car is approximately 56.67m

Answer:

m = 81281.5 pounds.

Explanation:

Given that,

Force, F = 73 kN

Acceleration of the space shuttle, a = 16000 mi/h²

1 miles/h² = 0.0001241 m/s2

16000 mi/h² = 1.98 m/s²

We need to find the mass of the spacecraft.

According to Newton's second law,

F = ma

m is mass of the spacecraft

\(m=\dfrac{F}{a}\\\\m=\dfrac{73\times 10^3\ N}{1.98\ m/s^2}\\\\m=36868.68\ kg\)

Since, 1 kg = 2.20462 pounds

m = 81281.5 pounds

Hence, the mass of the spacecraft is 81281.5 pounds.

The exact order of steps used in every experiment of the scientific method.

The scientific method is defined as the process of making facts through testing and experimentation. The basic process includes making an observation, forming a hypothesis, making a prediction, carrying out an experiment, and then analyzing the results.

The six steps of the scientific method include asking a question about something doing background research about the topic, constructing a hypothesis, doing experiments to test the hypothesis, analyzing the data from the experiment, and making conclusions.

So we can conclude that option A is the correct answer.

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Answer:

n = 1.49

Explanation:

Given that,

Angle of incidence = 30 degrees

Angle of refraction = 19.5 degrees

We need to find the refractive index of the honey. Using Snell's law, we can find it as follows :

\(n=\dfrac{\text{sin i}}{\text{sin r}}\\\\=\dfrac{\text{sin 30}}{\text{sin 19.5}}\\\\n=1.49\)

So, the refractive index of honey is 1.49.

The refractive index of honey will be "1.49".

Given:

Angle of incidence,

Angle of refraction,

As we know, the formula:

→ \(Refractive \ index, n = \frac{Sin \ i}{Sin \ r}\)

By substituting the values, we get

→                                  \(= \frac{Sin \ 30}{Sin \ 19.5}\)  

→                                  \(=1.49\)

Thus the above answer is right.

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Answer:

Hope it helps you

Explanation:

An electrostatic force is an attractive as well as replusive force caused by the electric charge particles.

Magnetic force is a consequence of electromagnetic force and is caused due to the motion of charges.

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Answer:

The resistance of 4/0 coated copper conductors is given as 0.0626 ohms per 1000 feet. To find the total resistance of the three 4/0 conductors installed in parallel, we can use the formula for combining resistances in parallel.

Since the total length for each of the three conductors is 323 feet, the resistance of each conductor can be calculated as follows:

Resistance of one conductor = (0.0626 ohms / 1000 feet) * 323 feet

To find the total resistance when the conductors are in parallel, we use the formula:

1/Total Resistance = 1/Resistance of Conductor 1 + 1/Resistance of Conductor 2 + 1/Resistance of Conductor 3

Total Resistance = 1 / (1/Resistance of Conductor 1 + 1/Resistance of Conductor 2 + 1/Resistance of Conductor 3)

Substituting the values, we get:

Total Resistance = 1 / (1/((0.0626 ohms / 1000 feet) * 323 feet) + 1/((0.0626 ohms / 1000 feet) * 323 feet) + 1/((0.0626 ohms / 1000 feet) * 323 feet))

Simplifying the expression will give us the total resistance of the three 4/0 conductors installed in parallel.