mechanical advantage of a second class lever is always greater than one why? give reason​

Answer:

B) t = 1.83 [s]

A) y = 16.51 [m]

Explanation:

To solve this problem we must use the following equation of kinematics.

\(v_{f} =v_{o} -g*t\)

where:

Vf = final velocity = 0

Vo = initial velocity = 18 [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time [s]

Note: the negative sign in the above equation means that the acceleration of gravity is acting in the opposite direction to the motion.

A) The maximum height is reached when the final velocity of the ball is zero.

0 = 18 - (9.81*t)

9.81*t = 18

t = 18/9.81

t = 1.83 [s], we found the answer for B.

Now using the following equation.

\(y = y_{o} + v_{o}*t - 0.5*g*t^{2}\\\)

where:

y = elevation [m]

Yo = initial elevation = 0

y = 18*(1.83) - 0.5*9.81*(1.83)²

y = 16.51 [m]

A distance-time graph is a straight line for constant speed.  In a distance-time graph, the x-axis represents time and the y-axis represents distance. When an object is moving at a constant speed, the distance it covers over time increases at a steady rate. This results in a straight line on the graph, where the slope of the line indicates the constant speed.

A distance-time graph shows the distance an object travels over a period of time. If the object is moving at a constant speed, then the graph will be a straight line. This is because the distance traveled in each unit of time is the same, so the slope of the line (which represents the speed) will be constant.

On the other hand, if the object is accelerating, the graph will not be a straight line, as the speed is increasing over time. Similarly, momentum has to do with the mass and velocity of an object, and is not directly related to distance and time. Average speed can also vary over time, so the graph would not be a straight line for this variable either.

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Answer:

Answer is A

Speed = Wavelength × Frequency

Explanation:

Googled it

1. Resistance is the opposition offered in a path of flow of current by the atoms or molecules of the conductor.

Factors on which resistance of a conductor depends are:

2. Rheostat is used to change the resistance without changing the voltage source in an electric circuit.

3.

Given :

\(\dashrightarrow l = 50 m\)

\(\dashrightarrow A = 0.01 {mm}^{2} \)

\(\dashrightarrow A = 0.01 \times {10}^{ - 6} \: {m}^{2} \)

\(\dashrightarrow \rho = 5 \times {10}^{ - 8} \: \Omega \: m\)

We know that,

\( \dashrightarrow R = \rho \dfrac{l}{A}\)

\( \dashrightarrow R = 5 \times {10}^{ - 8} \bigg(\dfrac{50}{0.01 \times {10}^{ - 6} } \bigg)\)

\( \dashrightarrow { \pink{ \underline{ R = 250 \: \Omega }}}\)

The resistance of a conductor is the opposition to the flow of current and depends on the length and area of the material

Resistance is the opposition to the flow of current by the atoms or molecules of the conductor.

The factors on which resistance of a conductor depends are:

A Rheostat is the device used to change the resistance without changing the voltage source in an electric circuit.

The resistanceis given as:

Area = 0.01 square mm = 1.0 × 10^-8 square m

R = (50 × 5 ×10 ^-8 ohm m)/1.0 × 10^-8 square m

Resistance = 250 ohm

Therefore, resistance of a conductor is the opposition to the flow of current.

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A Gardner crosses the plant with red and white flowers. Each is pure of its traits. If the gene of the flower shows incomplete dominance the dominant flow gene will show the color.

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Answer:

Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength.

Explanation:

The time it takes for the water along the shore to go from high to low and back again is six hours and 12.5 minutes between high tides, which happen every twelve hours and twenty-five minutes.

How long does it take for the tide to change from high to low?

six days, twelve and five minutes

Coastal locations see two high and two low tides every 24 hours and 50 minutes because the Earth spins through two tidal "bulges" every lunar day. There are 12 hours and 25 minutes between high tides. The sea level at the shore can change from high to low or from low to high in six hours and 12.5 minutes.

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The heat of the surroundings is  - 4482 J.

A calorimeter is a device in which that is no exchange of heat between the device and the environment. In other words, there could only be exchange of heat when the a substance has been put inside the calorimeter.

We know that in a calorimeter;

Heat of the surrounding =  Heat of the system

That implies that they are of the same magnitude but of opposite direction hence the heat of the system is - 4482 J.

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For our delicate measurement equipment to continue to operate accurately, gaussmeter calibration is necessary. In order to achieve this, we compare the instrument to one with a standard or greater accuracy. Then, if there is a deviation from the actual reading, we find it and fix it.

By delivering a reverse field to the magnet that is strong enough to bring the output (of flux) down to a reasonable level, magnetic calibration is accomplished.

Using a Tesla or Gauss metre, one may determine the intensity of a magnet's magnetic field. Many people who utilise magnets today possess their own Gauss metres and decide what magnetic field strengths are acceptable. The magnet analyzer will measure the magnetic field strength for multi-polar magnets.

The Hall Effect in semiconductors is the basis for how a digital Gauss metre functions. A voltage is created at a right angle to the current route when a semiconductor with current flowing in one direction is introduced perpendicular to a magnetic field.

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Answer:

5 ohms

Explanation:

V = IR

10 = 2 R

R = 5

Explanation:

a. Determine Luna's average speed.

Luna's Speed: 8.22 m/s

b. Determine Gianna's average speed.

Gianna's Speed: 4.90 m/s

c. How many times faster is Luna's speed?

Luna's Speed is 1.67 times faster

d. Who won the bet?

Luna won the bet.

To determine Luna's average speed, divide distance by time. Luna's speed is 8.23 m/s. Gianna's speed is 4.94 m/s. Luna's speed is 1.66 times faster than Gianna's.

To determine Luna's average speed, we need to divide the total distance of 440 meters by her total time of 53.4 seconds. Dividing the two gives us her average speed of 8.23 m/s.

To determine Gianna's average speed, we follow the same process. We divide the total distance of 440 meters by her total time of 89.1 seconds. This gives us her average speed of 4.94 m/s.

To find out how many times faster Luna's speed is compared to Gianna's, we divide Luna's speed by Gianna's speed. So, 8.23 / 4.94 = 1.66. This means Luna's speed is 1.66 times faster than Gianna's.

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Answer:

74.28 m/s

Explanation:

In this case, it is a zero launch angle in that the object is launched horizontally at a height H.

The formula to apply is:

\(R=v_o*\sqrt{\frac{2H}{g} }\)

where

R= range, 450 m

H= height of building ,180 m

g= 9.81

vo= ? initial velocity

Applying the values to the equation;

\(450 = v_o*\sqrt{\frac{2*180}{9.81} } \\\\450=v_o*\sqrt{36.70} \\\\450=v_o*6.06\\\\450/6.06 = v_o\\\\74.28 m/s=v_o\)

The charges of the two ions are equal, q1 = q2. Therefore, the charge of each ion is 1.935x10-19 C.  

The charge of each ion can be calculated using Coulomb's law. According to Coulomb's law, the electrostatic force between two point charges is inversely proportional to the square of the distance between them and is directly proportional to the product of the charges. Therefore, the magnitude of the electrostatic force between two identical ions is given by:

F = k * (q1 * q2) / d^2

Where k is a constant, q1 and q2 are the charges of the two ions, and d is the distance between them.

In this case, the magnitude of the electrostatic force between two identical ions is 1.557x10-9 n and the distance between them is 7.70 nm. Substituting these values into the equation above, we get:

1.557x10-9 n = (9x10^9 N*m^2/C^2) * (q1 * q2) / (7.7x10^-9 m)^2

Solving for q1*q2, we get:

q1*q2 = (1.557x10-9 n * (7.7x10^-9 m)^2) / (9x10^9 N*m^2/C^2)

q1*q2 = 1.935x10-19 C

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A refractometer is an optical instrument used to measure the refractive index of a substance. Calibration is essential to ensure the instrument is measuring accurately. Below are the steps to calibrate a refractometer:Step 1: Zero Calibration. Fill the prism dish with distilled water, and allow it to come to the room temperature.

Hold the refractometer in such a way that it receives light through the prism. Now, adjust the prism's focus until you see a clear dividing line. Place two or three drops of distilled water on the prism surface, and let it spread out to cover the whole prism. Close the cover plate and wait for a few seconds for the reading to stabilize. If the reading is not zero, adjust the zero adjustment screw.Step 2: Calibration with StandardsChoose a suitable reference material and make sure it has a refractive index close to the substance being measured. Clean the prism surface, add a drop of the reference material, and allow it to spread. Take the reading, and it should match with the reference values. If not, adjust the calibration screw on the side of the refractometer until the reading matches the reference value.Step 3: RinseClean the prism surface with distilled water, and wipe it dry with a clean cloth. It is essential to remove all the traces of reference material before measuring any other substance. If the instrument is not in use for a long time, it is better to clean the prism with a mixture of alcohol and distilled water.

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The speed an object needs to move away from the gravitational pull of the earth is called escape velocity.

Escape velocity is defined as the minimum speed an object must reach to escape the gravitational pull of a celestial body. For example, the escape velocity from Earth is about 11.2 km/s (or 40,320 km/h or 25,022 mph).

This means that an object needs to reach a speed of at least 11.2 km/s to break free from the Earth's gravitational field and continue traveling into space. If an object does not reach escape velocity, it will either enter into orbit around the celestial body or will be pulled back down to the surface.

The concept of escape velocity is important in space exploration and is used to determine the trajectories of spacecraft and rockets.

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The magnetic field 1 cm from the wire carrying a 1 A current is 2 x 10^-5 T.

To answer the question, we can use the formula for the magnetic field produced by a current-carrying wire, which is given by:
B = μ0I/2πr
where B is the magnetic field, I is the current, r is the distance from the wire, and μ0 is the permeability of free space (a constant equal to 4π x 10^-7 T·m/A).
In this case, we are given that the magnetic field 10 cm from the wire carrying a 1 A current is 2 μT. Therefore, we can plug in the values and solve for r:
2 μT = (4π x 10^-7 T·m/A) x 1 A / (2π x 0.1 m)
2 μT = 2 x 10^-6 T
Now we can use the same formula to find the magnetic field 1 cm from the wire:
B = μ0I/2πr = (4π x 10^-7 T·m/A) x 1 A / (2π x 0.01 m)
B = 2 x 10^-5 T
Therefore, the magnetic field 1 cm from the wire carrying a 1 A current is 2 x 10^-5 T, expressed in units of tesla (T).

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The correct answer to this question is D) The field points in two directions at the same place. Electric field lines represent the direction of the electric field at a given point in space.

When two electric field lines cross each other, it means that at that point, the electric field has two different directions. This is only possible if there are two or more charges of different signs in the vicinity, as the electric field lines always point from positive charges to negative charges.

The presence of an electrical conductor or insulator is not relevant in this situation, as they do not affect the direction of the electric field lines. However, it is important to note that conductors can redistribute charges in a way that can affect the electric field, leading to differences in the distribution of electric field lines.

In summary, the presence of two crossing electric field lines implies the existence of at least two point charges of opposite signs. It is a fundamental concept in electrostatics and is used to explain a wide range of phenomena, including electric fields around charges and the behavior of electrical circuits.

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For x-rays, an electron source, a mechanism of accelerating the electrons to high speeds, and a target for the accelerated electron to contact with are required, and these are also components of the cathode assembly. The function of the focusing cap is to concentrate the electron beam.

To make x-rays, you need three things: an electron source, a way to accelerate the electrons to high speeds, and a target for the accelerated electron to contact with. X-rays are created when free electrons release energy when they contact with atomic particles in the target.

A cathode head, a filament, and first and second focusing tabs comprise the cathode assembly. The focusing caps are used to focus electron beams in the tube.

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Answer:

b

Explanation:

The force that acts in a direction opposite to the motion of the moving object is called drag or air resistance.

Drag or air resistance is a force that acts on a moving object in a fluid medium, such as air or water, opposing its motion. It acts in a direction opposite to the motion of the object and is caused by the friction and pressure differences between the fluid and the object's surface. Drag force increases with the velocity of the object and its surface area, and it's usually modeled as a quadratic function of the velocity. For example, when a car is moving, the air resistance acts in the opposite direction of the car's motion, slowing it down. The drag force is not the only force that acts on the object, but it's one of the most significant forces acting on it, especially for objects moving at high speeds.

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Answer:

Eye function renders you the sense of sight. They convert light into electrical signals. Afterwards, the brain deciphers these electrical signals into images. Properly working healthy eyes are able to perform the following functions.

Explanation:

The specific gravity whose mass in the air is 160g and whose mass in water is 100 is 1.6.

Specific gravity is the ratio of the mass of a substance to that of an equal volume of water at 4°C (or to some other reference substance).

The specific gravity explains whether an object will sink or float in water.

The specific gravity of the substance in this question can be calculated by dividing its mass in air by its mass in water as follows:

Specific gravity = 160g ÷ 100g

Specific gravity = 1.6

Therefore, 1.6 is the specific gravity of the substance.

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The average electric current in the lightning will be 8 × \(10^{-17}\) A

The lightning conductors are long metal strips running from the spike end of a conductor on the top of a building to the earth. They are used to prevent buildings from destruction when struck by thunder or lightning.

Given that a lightning strike can transfer as much as electrons from the cloud to the ground. if the strike lasts 2ms, to calculate the average electric current in the lightning, we will first consider the charge released.

one charge = 1.6 × \(10^{-19}\) C

Average current I = Q/t

Where

Substitute all the parameters into the formula

I = 1.6 × \(10^{-19}\) C ÷ 2 × \(10^{-3}\)

I = 8 × \(10^{-17}\) A

Therefore, the average electric current in the lightning will be 8 × \(10^{-17}\) A

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Answer:

1176 N

Explanation:

We are given that

Mass of car=m1=1280 kg

Mass of trailer=m2=350 kg

Car exerts a horizontal force against the ground =3.6x103N

Coefficient of friction=0.15

We have to find the force exerted by car  on the trailer.

F={m1+m2)a+Ff

F={m1+m2)a+m2g

g=9.8m/s2

Substitute the values then we get

3.6x103=(1280+350a=0.15x350x9.8

3.6x103=1630a+514.5

1630a=3600-514.5=3085.5

a=3085.5/1630=1.89m/s2

Force exert on the trailer

F=m2a+m2g

F=350(1.98)=0.15x350x9.8

F=1176N

Hence, the car exerts force on the trailer=1176 N

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Answer:

Explanation:

Given:

F = 300 N

p = 20 N/m²

__________

A - ?

Valid for the area A:

A = F / p

A = 300 / 20 = 15 m²

Answer:

0.11 m

Explanation:

speed is equal to wavelength multiplied by frequency

So, 32= w × 288

32/288= 0.11

The acceleration of the object with an applied force of 100N and a mass of 50kg is 2m/s².

Acceleration is defined as the change in velocity per unit time. Velocity is defined as the speed of the object in a particular direction. The acceleration is a vector quantity. The unit of acceleration is m/s².

According to Newton's second law, Force is directly proportional to the acceleration of the object. F = m×a, where F is the force of the object, m is the mass of the object and a is the acceleration of the object.

From the given,

Force, F = 100N

mass of the object, m=50kg

acceleration of the object, a=?

F = m×a

a =F/m

  = 100/50

  =2m/s².

Thus, the acceleration of the object is 2m/s².

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Answer:

Explanation:

c. graduated cylinder

Answer:

v = 14.5 m/s

Explanation:

The Principle Of Conservation Of Mechanical Energy

In the absence of friction, the total mechanical energy is conserved. That means that

Em=U+K is constant, being U the potential energy and K the kinetic energy

U=mgh

\(\displaystyle K=\frac{mv^2}{2}\)

The ball with a mass of m=0.8 kg is thrown straight upward from the zero height reference (h=0) and with some speed (v). The potential energy is zero, but the kinetic speed is given by the equation above.

When the ball reaches its maximum height of h=10.7 m, the speed is zero and all the initial kinetic energy was transformed into potential energy, thus:

\(\displaystyle \frac{mv^2}{2}=mgh\)

Simplifying by m:

\(\displaystyle \frac{v^2}{2}=gh\)

Solving for v:

\(\displaystyle v=\sqrt{2gh}\)

Substituting:

\(\displaystyle v=\sqrt{2*9.8*10.7}\)

Calculating:

v = 14.5 m/s