The mineral barite is

Answer: A velocity is correct

Answer:

Yes, it is validated to extrapolate the acceleration value to an angle of 90 degrees.

Explanation:

Assume the friction-less inclined plane. There exists a mathematical relationship between angle of incline and the object rolling in downward direction on friction-less inclined plan.

Acceleration of object = sinθ × g  

Here, θ=90 degrees so,

Acceleration of object = g = 9.8 m/s^2

Hence, it is validated to extrapolate the acceleration value to an angle of 90 degrees .

The maximum height reached by the arrow launched straight upward with an initial speed of 35 m/s is 62.5 meters.

To calculate the maximum height reached by an arrow launched straight upward, we can use the equations of motion. Neglecting air resistance, the arrow will reach its maximum height when its vertical velocity becomes zero. The equation to calculate the maximum height, h, is given by:

h = (v2) / (2g)

where v is the initial speed of the arrow and g is the acceleration due to gravity.

Plugging in the values, we get:

h = (352) / (2 * 9.8) = 62.5 meters

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Final answer:

The final speed of the rock is greater than that of the ball because the rock falls for a longer time, resulting in a final speed that is twice as much as that of the ball when comparing the times of 2 seconds and 4 seconds of free fall under gravity.

Explanation:

To compare the final speeds of the ball and the rock dropped from the same building, but at different times, we will use the equation of motion under constant acceleration due to gravity, which is v = u + at, where v is the final velocity, u is the initial velocity (zero in this case, since both objects are dropped), a is the acceleration due to gravity (9.81 m/s2), and t is the time in seconds.

For the ball that falls for 2 seconds:

For the rock that falls for 4 seconds:

Thus, the final speed of the rock is greater than the final speed of the ball. Specifically, the rock's final speed is twice that of the ball's final speed because the time it falls is doubled, and since the acceleration due to gravity is constant, the final speed simply scales with time.

Answer: 100%

Explanation:

Efficiency = output/input = 100/100 x 100 = 100% efficient

Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input.

Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.

To determine the magnitude and direction of a vector with components vx and vy, use the formulas √(vx² + vy²) and θ = arctan(vy/vx) respectively. Take into account the signs of vy and vx for the right directional value.

The given question involves a vector operation to determine the magnitude and direction of velocity, denoted by 'v'. The vector 'v' has components 'vx=9.80 units' and 'vy=-6.40 units', and we can use these to find the magnitude and direction.

To find the magnitude, you use the formula for the magnitude of a vector: √(vx² + vy²), which in this case gives us v = √((9.80 units)² + (-6.40 units)²). The magnitude of v is the square root of the sum of the squares of vx and vy.

Next, to find the direction of the vector, we can use trigonometric concepts. The formula for the direction (θ) of a vector is θ = arctan(vy/vx). Here, direction stands for the angle the vector makes with the positive x-axis.

Note: Pay attention to the quadrant in which the vector exists based on the signs of vy and vx, to determine the right value for the direction.

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Millikan would have measured a charge of 4.8  imes [tex]10^{-19}[/tex] C on an oil droplet carrying 3 electrons, as each electron has a charge of 1.6 imes [tex]10^{-19}[/tex] C.

If Millikan was measuring the charge on an oil droplet with 3 negatively charged electrons on it, he would have measured a charge on the droplet by multiplying the charge of a single electron by the number of electrons on the droplet. Therefore, the charge measured would be 3 times 1.6 imes [tex]10^{-19}[/tex] C, which equals 4.8 imes [tex]10^{-19}[/tex] C. Each electron has a fundamental charge of 1.6 imes [tex]10^{-19}[/tex] C, a value that Millikan determined through his experiment to be the standard charge of a single electron.

First calculate the time by using following equation:
d= (vi+vf)/2 x t 

where t = time

vi is the initial velocity = 23 m/s

vf is the final velocity  = 0 m/s

and d is the distance covered = 85m

85 = (23 + 0)/2 x t

t = 85/11.5 = 7.39s

Now use this equation to find acceleration:

a= (vf-vi)/t 

a = 0 – 23/ 7.39

a = -3.112 m/s²

so, the acceleration is 3.112 m/s²

The magnitude of the car's acceleration was 3.1 m/s²

Acceleration is rate of change of velocity.

[tex]\large {\boxed {a = \frac{v - u}{t} } }[/tex]

[tex]\large {\boxed {d = \frac{v + u}{2}~t } }[/tex]

a = acceleration (m / s²)v = final velocity (m / s)

u = initial velocity (m / s)

t = time taken (s)

d = distance (m)

Let us now tackle the problem!

Given:

initial velocity = u = 23 m/s

final velocity = v = 0 m/s

distance = d = 85 m

Unknown:

acceleration = a = ?

Solution:

[tex]v^2 = u^2 + 2ad[/tex]

[tex]0^2 = 23^2 + 2a(85)[/tex]

[tex]0 = 529 + 170a[/tex]

[tex]170a = -529[/tex]

[tex]a = -529 / 170[/tex]

[tex]\large {\boxed {a = -3.1 ~ m/s^2} }[/tex]

The acceleration was 3.1 m/s² in the opposite direction to its velocity.

A negative sign means the direction of acceleration is opposite to the direction of velocity.

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate

The above statement is true

Swinging a tennis racket against a ball is an example of a third class lever.

Metals are good conductors of temperature and electricity. The electric iron can be used to remove the wrinkles on cloth as they can conduct heat and transfer it.

Metals are electropositive elements in periodic table. Metals have peculiar features such as malleability, ductility, luster , conductivity. etc. The most important property of metals being their higher conductivity of heat and electricity.

Metals are composed of particles strongly connected with metal - metal bonds. Hence, heat energy can be easily passed through the close packed system as well through the voids of the metal lattice.

Therefore, they can removes the wrinkles on cloth by high heat. Iron is a transition metal and is a good conductor. It is used in iron boxes to stiffen clothes by high heating.

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Correct Answer is A. A:Olfactory

Taste disorders may be linked to a problem with the olfactory system.

Therefore the correct answer is option A.

The deliberate, empirically supported pursuit and application of knowledge and understanding of the natural and social worlds are what is known as science.

The physiological system that detects smells is called the olfactory system. The system contains the nasal cavities, which, in their bottom and top halves, respectively, support the olfactory mucous membrane for the sense of smell and function as breathing tubes.

As a result, olfactory system issues may be related to taste abnormalities; consequently, option A is the appropriate response.

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Answer:

A bimetallic strip bends so that the steel is on the outside curve.

Explanation:

A bimetallic strip is a combination of two different metals. The linear  coefficient of expansion of various metals are different, depending on their characteristics. For example, when a bimetallic strip of brass and steel are taken, thermal expansion coefficient of brass is more than that of steel.

That implies brass expands more than steel, for a given amount of heat supplied. So brass will curve outward since it becomes longer compared to steel. Steel will curve inwards.

Similarly, for cooling process where a drop in the temperature occurs, brass contracts more compared to steel and so Steel will be on outside curve.

Answer: A: based in scientific evidence.

Explanation:

Scientific laws are made after proper research under varying conditions using scientific method to show that a particular theory is right under stated conditions

Scientific laws are carried out using methods ands not just any process with condition taken into consideration

At the constant pressure, the final temperature of the gas was equal to 313ºC at a volume of 1200cm³. Therefore, option (D) is correct.

Charles's law can be explained as when the pressure is kept constant, the volume of gas is directly proportional to its absolute temperature.

Therefore, V∝ T

or       [tex]{\displaystyle \frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]                                                           ..................(1)

Given, the initial temperature of the gas, T₁ = 20 ºC

T₁ = 20 + 273 = 293 K

The initial volume of the gas, V₁ = 600 cm³

The final volume of the gas, V₂ = 1200 cm³

Substitute the value of V₂, T₁, and V₁ in equation (1) to find the final temperature of the gas:

[tex]{\displaystyle \frac{600}{293} =\frac{1200}{T_2}[/tex]

T₂ = 586 K

T₂= 586 - 273 = 313 ºC

Therefore, the final temperature of the gas was equal to 313 ºC at the volume of 1200cm³.

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