An engineer builds a model of a machine pivot. Instead of the two parts of the pivot directly touching one another, they have ball bearings between them.


As an indication of the amount of friction in the pivot, what should the engineer measure?

Responses

the radius of the ball bearings before the pivot has been used

the radius of the ball bearings before the pivot has been used

the increase in mass of the ball bearings when the pivot rotates

the increase in mass of the ball bearings when the pivot rotates

the temperature increase in the ball bearings when the pivot rotates

the temperature increase in the ball bearings when the pivot rotates

the number of ball bearings remaining after the pivot has been used

the number of ball bearings remaining after the pivot has been used

1.5189  inches of rain fell during this 18 min period.

The amount of rain that fell in total over a specific time period, measured in millimeters, is the most typical rainfall measurement.

Area = 57.0 km² = 57.0 × 1000 × 1000 m²

Volume of water = 5.81 × 10⁸ gallon =  5.81 × 10⁸ × 0.00378541 m³ = 2199323.21 m³

Hence, the height of the rain water

= (2199323.21 m³) ÷ (57.0 × 1000 × 1000 m²)

= 0.03858 m

= 0.03858 × 39.3701 inch

= 1.5189  inch

So, 1.5189 inches of rain fell during this 18 min period.

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The direction in which the 25 kg mass will move is to the Left. The correct option is A.

This is because the force pulling to the left is greater than that to the right.

The velocity of the mass after 1 second will be 0.4 m/s

The velocity of the mass after 2 seconds will be 0.8 m/s

The net force o the mass of 25 kg is given below:

Net force = 20 N - 10 N

Net force = 10 N

The velocity of the mass is given by the formula below:

Velocity = net force * time / mass

velocity after 1 second = 10 * 1 / 25

velocity after 1 second = 0.4 m/s

velocity after 2 seconds = 10 * 2 / 25

velocity after 2 seconds = 0.8 m/s

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A.  Light travels approximately 670,616,320 miles in an hour.

B.  Light travels approximately 16,094,718,080 miles in a day.

Light travels at a speed of 186,282 miles per second. To find out how far it travels in an hour, we can simply multiply this speed by the number of seconds in an hour:

Distance traveled in an hour = 186,282 miles/second x 3,600 seconds/hour = 670,616,320 miles/hour

Therefore, light travels approximately 670,616,320 miles in an hour.

To find out how far light travels in a day, we need to multiply the distance traveled in an hour by the number of hours in a day:

Distance traveled in a day = 670,616,320 miles/hour x 24 hours/day = 16,094,718,080 miles/day

Therefore, light travels approximately 16,094,718,080 miles in a day.

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At 65°C, lithium is a solid. At 200°C, liquid would be the state of matter.

State of matter refers to the physical form in which a substance exists. There are four main states of matter: solid, liquid, gas, and plasma. In a solid, particles are closely packed together and have a fixed shape and volume. In a liquid, particles are close together but can flow and take the shape of their container. In a gas, particles are widely spread out and have a much larger volume and take the shape and volume of their container. In plasma, particles are highly ionized and have unique electrical and thermal properties.

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The static values of circuit components, current rates, voltage sources, and voltage drops can all be verified using Ohm's Law.

A test instrument may indicate that resistance has dropped or voltage has increased, resulting in a high-voltage condition, if it detects, for instance, a higher than usual current reading. This can point to a supply or circuit problem.

A lower than usual current reading in a direct current (dc) circuit could indicate that the voltage has dropped or the circuit resistance has risen. Poor or loose connections, corrosion, and/or broken components are potential sources of higher resistance.

Electrical current is drawn by the loads of a circuit. Any type of component, including small electrical gadgets, computers, home appliances, or a sizable engine, can be a load.

Therefore, The static values of circuit components, current rates, voltage sources, and voltage drops can all be verified using Ohm's Law.

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Answer:fdxv

Explanation:

fdc

Answer:

A

Explanation:

At 1500°C, uranium would be in a molten or liquid state. As it cools to 900°C, it will solidify

The temperature of a substance determines its state of matter. At high temperatures, substances tend to be in a liquid or gaseous state, and as the temperature decreases, they solidify.

In the case of uranium, at 1500°C, it would be in a molten or liquid state because this temperature is higher than its melting point of 1132°C.

However, as it cools to 900°C, it will become solid because 900°C is below its melting point.

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The speed of  the bullet when it passes by the cliff on its way is V0 itself which is equal to h/t. The speed just before it strikes the grounds will be  √2gh.

Speed is a physical quantity measuring the distance travelled per unit time. It depends on the mass of the object as well some external factors such as friction, air resistance etc.

Here, the initial velocity of the bullet = V0

the speed of the bullet within a time t to pas the height of the cliff will be h/t.

Now, the kinetic energy of the ball just before it striking the ground is equal to its potential energy.

hence, 1/2 mv² = mgh

then v = √2gh.

If the bullet is instead fired downward with the same initial speed v0, then it is accelerating downwards then the speed  is √2gh + V0.

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When we change the speed 0.200cm/s to km/yr​ we get 6.5 × 10⁴ km/yr.

What is Speed?

Speed refers to the rate at which something moves or operates, usually measured in units of distance per time, such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). In physics, speed is defined as the magnitude of velocity, which is a vector quantity that describes the rate of change of an object's position. Speed is often used in many areas, such as transportation, sports, and technology.

We know that

1km = 1000m

1m = 100cm

and

1 year = 365day

1 day = 24 hours

1 hour - 60 min

1 min = 60 sec

With this, we have

[tex]$ \frac{200 \text{cm}}{1 \text{sec}} = \frac{200 \times 100\text{cm} \times 1000 \text{cm}}{60\ \text{sec}\times 60\ \text{sec}\times 24 \text{hours} \times 356 \text{days}}[/tex]

0.00065 km/yr​

Thus, When we change the speed 0.200cm/s to km/yr​ we get 6.5 × 10⁴ km/yr.

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Modern periodic table is created by Mosely and he classified elements based on their atomic numbers. The vertical columns in the table are called groups and the horizontal lines are called periods.

Periodic table is the classification of elements into different groups and periods. Groups are vertical columns in the table, containing elements with same number of valence electrons and similar chemical and physical properties.

Periods are horizontal rows in periodic table. From left to right the atomic number of elements increases by one. Lead is 82nd element in periodic table and it is placed in the 14th groups.

Metalloids are elements showing properties of both metals and non-metals. Metalloids are classified in group 14 as well in group 13.

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The spring needs to be compressed by 0.175 meters in order to store 20.0 J of elastic potential energy.

Elastic potential energy is the energy stored in an object when it is deformed or stretched due to an applied force. It is present in springs, rubber bands, and other elastic materials that can be stretched and then return to their original shape.

The amount of elastic potential energy stored in an object is directly proportional to the amount it is stretched or compressed, and is proportional to the square of the deformation. The formula for elastic potential energy is given by U = (1/2)kΔx^2, where U is the elastic potential energy, k is the spring constant, and Δx is the change in length of the object. When the force is removed, the stored elastic potential energy is converted into kinetic energy, causing the object to return to its original shape.

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(a) Relative to the ground, the gravitational potential energy of the orange on the branch is 4.29 J and on ground is 0 J.

(b) ) Relative to the branch, the gravitational potential energy of the orange on the branch is 0 J and on ground is 4.29 J.

(c) The change in potential energy relative to the ground is -4.29 J and relative to the branch is 0 J.

Relative to the ground, the gravitational potential energy of the orange on the branch is calculated as follows;

P.E = mgh

where;

P.E = 0.125 kg x 9.8 m/s² x 3.5

P.E = 4.29 J

The gravitational potential energy of the orange on the ground is calculated as follows;

P.E = mgh

P.E = m x g x 0 m

P.E = 0 J

The change in potential energy = final potential energy - initial potential energy

change in potential energy relative to ground = 0 J - 4.29 J = - 4.29 J

change in potential energy relative to branch = 4.29 J - 4.29 J = 0

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A launch of one pod per minute would transport 240 passengers per hour, roughly equivalent to one jet plane per hour. The total  speed is 235 km/s2.

acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.

Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing. For all other kinds of motion, both effects contribute to the acceleration.

Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity. Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.

Therefore,  A launch of one pod per minute would transport 240 passengers per hour, roughly equivalent to one jet plane per hour. The total  speed is 235 km/s2.

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a. Time that the first player took to catch his opponent is 14.1 s after he makes up his mind to chase his opponent.

b. The player has traveled 31.8 m to catch his opponent.

According to uniform motion remains the same and the distance will increase with time. The formula to calculate distance

d = v × t

According to non-uniform motion, the speed will increase with time when the object has acceleration. The formula to calculate distance

d = (v₁ × t) + (0.5 × a ×t²)

Two players didn't move at the same time. The second player moves first. After 1.80 s the first player just move.

When the first player catches his opponent, the distance between the two is the same.

d first player = d second player

(v₁ × t) + (0.5 × a × t²) = v × t

(0 × t) + (0.5 × 0.32 × t²) = 2.0 × (t + 1.80)

0 + 0.16t² = 2.0t + 3.60

0.16t² - 2.0t - 3.60 = 0

multiply by 100

16.0t² - 200.0 - 360.0 = 0

divided by 8

2.0t² - 25.0t - 45.0 = 0

Using quadratic formula

The distance

d = (v₁ × t) + (0.5 × a × t²)

d = (0 × 14.1) + (0.5 × 0.32 × 14.1²)

d = 0 + (0.16 × 198.81)

d = 31.8 m

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The time that the  speed of the object increase by equal amount in equal times is 0 s to 2 s .

Uniform acceleration is a type of acceleration in which an object moves in a straight line and the magnitude of its acceleration remains constant over time. In other words, the object's velocity increases by an equal amount in equal time intervals.

In the case of uniform acceleration, the velocity of an object changes at a constant rate, making it a key concept in kinematics and the study of motion.

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The velocity of the bird would be 4.16 m/s².

        {v} = dx/dt

Given is that a bird is flying due east. Its distance from a tall building is given by -

x{t} = 29 + 12.8t - 0.0450t³

Instantaneous velocity is given by -

{v} = dx/dt                                                    ... Eq { 1 }

Now -

v = dx/dt = d/dt (29 + 12.8t - 0.0450t³)

v = dx/dt = 0 + 12.8 - (3 x 0.0450t²)

v = dx/dt = 12.8 - 0.135t²

v{8} = dx/dt = 12.8 - 0.135 x 8 x 8

v{8} = dx/dt = 12.8 - 8.64

v{8} = dx/dt = 4.16

Therefore, the velocity of the bird would be 4.16 m/s².

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For full negative cycle and some part of positive cycle, there is be a voltage drop across the load.

A diode is a semiconductor gadget that essentially switches current in a single direction. While significantly limiting current flow in the opposite direction, it permits easy flow in one direction.

In this given circuit, diode is placed such that the only positive half cycle of ac voltage can passes through it but an opposite potential also applied. Hence, for a certain level and upward the diode acts as short and for full negative cycle and some part of positive cycle, there is be a voltage drop across the load.

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There would be  5.38 × 10¹⁹ number of molecules of air at that condition.

A theoretical gas known as an ideal gas is made up of several randomly moving point particles with no interparticle interactions.

Because it abides by the ideal gas law, a condensed equation of state, and is amenable to statistical mechanics analysis, the ideal gas concept is helpful.

The amount of air = PV/RT

= (4.0 × 10 ⁻¹¹× 0.060)/ 8.314 ×(273 + 50) mole

= 8.93714 × 10⁻⁵ moles.

molecules of air would there be =  8.93714 v × 6.023 × 10²³ = 5.38 × 10¹⁹

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A mechatronic system can be a common household appliance such as a washing machine, a car engine, or an industrial production line.

For example, in a washing machine, the actuators could be the DC motors that control the drum's rotation, the solenoids that control water flow, and the voice coils that control the drum's position.

The sensors could be switches that detect the lid's position, the photoelectrics that detect the presence of clothes, and the potentiometers that measure the drum's position.

The input signal conditioning and interfacing could be the discrete circuits that filter and amplify the signals from the sensors.

The graphical displays could be the LED lights that indicate the status of the machine, and the output signal conditioning and interfacing could be the amplifiers and power transistors that control the actuators.

The digital control architecture could be the microcontroller that implements the control algorithms and sequences the operations of the machine.

This is just an example of how to map a mechatronic system, and the components and their arrangement can vary greatly depending on the specific system being analyzed.

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The total displacement of the  journey is 80 m.

Displacement is a vector quantity that describes the change in position of an object from its initial position to its final position in a given reference frame.

It is equal to the difference between the final position and the initial position of an object and is commonly used in physics and engineering to describe motion. Displacement is usually measured in units of length such as meters.

The graph can show us the that point of the highest displacement is 80m.

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Answer: 5. 1/2 fraction of a wave comes by each second. 6. 1/10 of the wave comes by each second 7. 3.

Explanation: 5. The formula for frequency is f = 1/t, T being period, so the frequency is 1/2.

Same thing with the 6th question, f=1/10

The 7th question asks about celerity, the wave celerity is  the speed c at which the wave moves in the x-direction, is given by c=L/T, with L being the wavelength and T being the period.

Therefore C= 6/3, C= 3.

Answer:

The student should hold his umbrella at an angle facing south-west.

Answer:

0.65 m/s NORTH

Explanation:

North is +, south is -

let V = velocity of the 0.12 kg ball AFTER the collision

Law of conservation of momentum (P = mv) states that total momentum before the collision must equal total momentum after the collision.

(0.10 kg)(9.6 m/s) - (0.12 kg)(7.6 m/s) = -(0.10 kg)(0.30 m/s) + (0.12 kg)(V)

                           Before                     →              After

0.96 kg·m/s - 0.912 kg·m/s = -0.03 kg·m/s + 0.12 kg(V)

0.048 kg·m/s + 0.03 kg·m/s = 0.12 kg(V)

0.078 kg·m/s = ·0.12 kg(V)

V = 0.078 kg·m/s / 0.12 kg = 0.65 m/s NORTH

We do not know the value of L0 and d, we cannot calculate the exact change in angle. However, we can find the order of magnitude of Δθ by using the values given in the problem.

The change in the angle can be calculated by using the formula for linear expansion: ΔL = L0 * α * ΔT, where ΔL is the change in length, L0 is the initial length, α is the coefficient of linear expansion, and ΔT is the change in temperature.

We can assume that the distance between the two slits is the length L0. The change in length ΔL will cause a change in the angle of the dark fringes, which can be calculated using the formula: Δθ = ΔL / d, where Δθ is the change in angle and d is the distance from the slits to the observation point.

So, ΔL = L0 * α * ΔT = L0 * α * (135 - 20)

Δθ = ΔL / d

Substituting the given values, we get:

Δθ = L0 * α * (135 - 20) / d

= L0 * 2.0 x 10^-5 * 115 / d

Since we do not know the value of L0 and d, we cannot calculate the exact change in angle. However, we can find the order of magnitude of Δθ by using the values given in the problem.

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Radiant energy that moves in waves at the speed of light is known as electromagnetic energy. Radiant energy, electromagnetic radiation, electromagnetic waves, light, or the movement of radiation are other names for it.

James Clerk Maxwell, a 19th-century physicist whose research had a major impact on the development of quantum mechanics, discovered electromagnetic radiation.

We can think of electromagnetic energy or radiation functioning similarly to a typical ocean wave in terms of how it operates. The radiation is the water in this analogy.

Radiation from an electromagnetic field can transfer heat. Heat, energy, or light waves are transmitted from one place to another across a vacuum or a medium using electromagnetic waves.

Therefore, Radiant energy that moves in waves at the speed of light is known as electromagnetic energy. Radiant energy, electromagnetic radiation, electromagnetic waves, light, or the movement of radiation are other names for it.

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a. The position of the sandbag at a time 0.245 s after its release is 39.706 m from the ground.

b. The magnitude of the velocity of the sandbag at a time 0.245 s after its release is 2.4 m/s.

c. The direction of the velocity of the sandbag at a time 0.245 s after its release is to the ground.

d. The position of the sandbag at a time 1.15 s after its release is 33.52 m from the ground.

e. The magnitude of the velocity of the sandbag at a time 1.15 s after its release is 11.27 m/s.

f. The direction of the velocity of the sandbag at a time 1.15 s after its release is to the ground.

According to the free-fall motion, when an object is released without an initial velocity from a certain height the object will experience acceleration due to the gravitational force of the earth. The non-uniform motion formula

v = u + at

d = (u × t) + 0.5at²

The formula for free-fall motion become

v = u + at                  ⇒ v = gt

d = (u × t) + 0.5at²   ⇒  d = 0.5gt²

When the sandbag is released by the balloon at h = 40.0 m, it moves in a free-fall motion.

At t = 0.245 s

At t = 1.15 s

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A Type I error, also known as a false positive, occurs when a statistical hypothesis test rejects a null hypothesis that is actually true. For example, consider a medical test for a certain disease.

A Type II error, also known as a false negative, occurs when a statistical hypothesis test fails to reject a null hypothesis that is actually false. In the medical test example, a Type II error would occur if the test result suggests that the person is healthy when they actually have the disease.

Both Type I and Type II errors are harmful to research because they can lead to incorrect conclusions and decision-making.

A Type I error can result in unnecessary treatments or actions, while a Type II error can result in missed opportunities to identify and address a problem. These errors can negatively impact the validity of research and its real-world applications.

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The amount of energy required to increase the temperature of 20 g of water from 283°C to 303°C is approximately 6.1 kJ.

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