The wavelength of light from a monochromatic source is measured to be 6.80 X 10^-7 m. (a) What is the frequency of this light? (b) What color would you observe?
please show calculation

A football player throws a football 30 meters in 2.5 seconds, divide 30 by 2.5 and get 12.

An object's speed, also known as "v," is the amount by which its position changes over time or by how much it changes per unit of time, making it a scalar number.  

The instantaneous speed is the upper limit of the average speed as the duration of the time interval approaches zero. The average speed of an item in a period of time is equal to the distance traveled by the object divided by the duration of the period. Velocity and speed are not the same thing.

The parameters of speed are time divided by distance. The metre per second (m/s), the SI measure of speed, is the most widely used unit of speed in daily life.

Therefore, A football player throws a football 30 meters in 2.5 seconds, divide 30 by 2.5 and get 12.

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Answer:

Two possibities: Increase in pressure or decrease in temperature.

Explanation:

There are two possibilities under the assumption that mass of the gas is conserved and, consquently, the amount of moles is also conserved, a reduction in the volume of the gas leads to an increase in pressure (Boyle's Law) and a decrease in temperature (Gay-Lussac's Law)

Answer:

6,001′ 0″

Explanation:

Incised by the Colorado River, the canyon is immense, averaging 4,000 feet deep for its entire 277 miles. It is 6,000 feet deep at its deepest point and 18 miles at its widest. However, the significance of Grand Canyon is not limited to its geology.

Answer:

fif = 0.01 x 5000 = 50 N

Explanation:

u=150 m/s

v=0

m-10 y =0.01 kg

t=0.03s

s

v=utat

o= 150+a (0.03)

therefore a= -5000 m/s power 2

v power 2 = u power 2 + 2as

0=150 power 2+ 2 x (-5000) x s

therefore f=2.25 m

Answer:

The energy that will go will for thermal store of the surroundings is 20 J.

Explanation:

Given;

kinetic of the thrown ball, K.E₁ = 50 J

kinetic energy used to move the target, K.E₂ = 30 J

The excess energy that will go will for thermal store of the surroundings;

ΔK.E = K.E₁ - K.E₂

ΔK.E = 50J - 30J

ΔK.E = 20 J

Therefore, the energy that will go will for thermal store of the surroundings is 20 J.

Answer:

The frequency at which the string will create a standing wave be  with three loops is 8.6 Hz

Explanation:

The speed of the of the wave, v = 12.9 m/s

The number of loops of the standing wave = 3 loops

The length of the string = 2.00 m

Given that one loo = half of the wavelength, we have;

Three loops = 3 × half = One and half wavelength  = 1.5·λ

The frequency of a wave = f = v/λ

Therefore, we have;

The frequency, f = 12.9/1.5 = 8.6 Hz

The frequency at which the string will create a standing wave be  with three loops = 8.6 Hz.

Answer:

9.675

Explanation:

got it right on acellus

Determine the amount, location, and direction that the force is required to maintain the balance of the bar: [Ans: 106 North, 0.675 Left at 49"] G0 N 70 N.

If all three of a following three conditions are true, a solid subjected by three forces with opposing lines or action is in equilibrium: There are coplanar action lines (in the same plane) The lines of activity have intersected (they cross at the same point) These forces combine to form a vector that sums to zero.

An object is now in equilibrium or moving at a constant speed if it is subjected to two equal and opposing forces. A object resting on the a horizontal surface serves as an illustration of this. The object's weight is equal to and in opposition to the upward resistive force.

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Explanation:

It is given that,

The angle of projection is 60 degrees

Initial velocity of the ball is 120 m/s

We need to find the time taken to get to the maximum height and the time of flight.

Time taken to reach the maximum height is given by :

\(T=\dfrac{u^2\sin^2\theta}{2g}\)

g is acceleration due to gravity

\(T=\dfrac{(120)^2\times \sin^2(60)}{2\times 10}\\\\T=540\ s\)

(ii) Time of flight,

\(t=\dfrac{2u\sin\theta}{g}\)

So,

\(t=\dfrac{2\times 120\times \sin(60)}{10}\\\\t=20.78\ s\)

Hence, this is the required solution.

Answer:

1) Lithospheric plates move in the asthenosphere due to rising and sinking of materials is 1.

2) The decomposition of radioactive elements causes heat in the interior part of the Earth

3) Heat slowly rises to the mantle and creates convection current.

4). Heat moves to the core

5) The process repeats as cycle.

Explanation:

Mantle convection is the gradual slow creeping of movement of the Earth's mantle which is as a result of convection current which transfer heat from the interior to the surface of the Earth .

The process of mantle convection start with

1. Lithospheric plates move in the asthenosphere due to rising and sinking of materials is and thus form the two component of the mantle.

2) The decomposition of radioactive elements causes heat in the interior part of the Earth. This is as a result of accretion which is associated to sea flooding

3) Heat slowly rises to the mantle and creates convection current.

4). Heat moves to the core, cools down by conduction and convection of heat.

5) The process repeats as cycle.

The proper and correct arrangement of events in the mantle convection process are:

1. The decomposition of radioactive elements causes heat in the interior part of  the Earth.

2. Heat moves to the core

3. Heat slowly rises to the mantle and creates convection current.

4. Lithospheric plates move in the asthenosphere due to rising and sinking of  materials.

5. The process repeats as a cycle.

Convection is considered to be one of the most efficient ways through which heat is transported from the interior of planet Earth to the surface.

Mantle convection can be defined as the very slow transfer of heat due to the movement of Earth's solid silicate material within the mantle.

Basically, the slow creeping of the mantle causes a transfer of heat from the white-hot core to the brittle lithosphere during mantle convection.

Furthermore, the heating of the mantle takes place from below (the core) and it rises upward in hotter regions while it sinks down in colder regions.

The proper and correct arrangement of events in the mantle convection process are:

1. Heat is caused in the interior part of  the Earth due to the decomposition or decay of radioactive elements.

2. Heat moves to the core.

3. Heat slowly rises from the Earth's core to the mantle and creates convection current in the asthenosphere, which is the plastic layer of the mantle.

4. Lithospheric plates move in the asthenosphere due to rising and sinking of  materials.

5. The process is then repeated as a cycle.

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In this situation, both balls will exert electrostatic force on each other in the first example.

Part b)

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Complete question : Two identical metal balls are suspended by insulating threads. Both balls have the same net charge. In this problem, do not assume the balls are point charges. a. Draw a separate free-body diagram for each ball. Label the forces to indicate: - the object exerting the force, - the object on which the force is exerted, - the type of force (gravitational, normal, etc.), and - whether the force is a contact or a noncontact force. b. Suppose the charge on the second ball is reduced slightly, so that it is less than that on the first ball. Predict whether the angle that ball l makes with the vertical will be greater than, less than, or equal to the angle that ball 2 makes with the vertical. Explain. Sketch your answer above. Name Ball I Ball 2 Free-body diagram Free-body diagram for ball I for ball 2 - - Ball I Ball 2 How does the free-body diagram for each ball in this case compare to the corresponding freebody diagram that you drew in part a

5) Average acceleration of race car will be 8 m/\(s^{2}\)

6) Average acceleration of race car will be -7 m/\(s^{2}\)

7 a) Average acceleration of bus will be - 8.33 m/\(s^{2}\)

7 b) If bus took twice as long to stop , acceleration will become - 4.166 m/\(s^{2}\)

8) Car's average acceleration will be 3 m/\(s^{2}\)

Average acceleration the rate of change in velocity; the change in velocity over time instantaneous acceleration acceleration at a specific point in time.

5) given

final velocity = 36 m/s

initial velocity = 4 m/s

time = 4 sec

average acceleration = (36 - 4) / 4 = 8 m/\(s^{2}\)

6) given

final velocity = 15 m/s

initial velocity = 36 m/s

time = 3 sec

average  acceleration = 15 - 36 / 3 = -21 / 3 = -7 m/\(s^{2}\)

7) a) given

final velocity = 0

initial velocity = 25 m/s

time = 3 sec

average acceleration = 0 - 25 / 3 = - 8.33 m/\(s^{2}\)

b) given

final velocity = 0

initial = 25 m/s

time = 3 * 2 = 6 sec

acceleration = -25 / 6 = - 4.166 m/\(s^{2}\)

8) given

initial velocity = -3 m/s

final velocity = 4.5 m/s

time = 2.5 sec

average acceleration = 4.5 - (-3) / 2.5 = 3 m/\(s^{2}\)

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The force on a positive charge is arbitrarily chosen as the direction of the electric field since an electric field has both magnitude and direction.

The direction of the force acting on a negative charge is the exact opposite of the direction acting on a positive charge. The electric field surrounding a single positive charge is directed radially outward because positive charges resist one another.

Electric fields are typically shown as lines of force or field lines, which begin on positive charges and end on negative charges. A field line's tangent line shows the direction of the electric field there.

The electric field is stronger where the field lines are near together than it is farther apart. Depending on how the charge is distributed in an electric field, which is believed to be the source of the electric field, the size of the electric field around the source.

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a. The isotope's half life is 30.1 hours.

b. The sample is usable for about 101.5 hours after delivery at the hospital.

a. We can use the formula for radioactive decay:

A = A0 * (1/2)^(t/T)

where A0 is the initial activity, A is the activity after time t, T is the half-life.

We have A0 = 135 mCi, A = 95 mCi, and t = 13 hours. We can solve for T:

95 mCi = 135 mCi * (1/2)^(13/T)

Taking the natural logarithm of both sides, we get:

ln(95 mCi) = ln(135 mCi) - (13/T) * ln(2)

Solving for T, we get:

T = -13 / (ln(95/135) / ln(2))

T ≈ 30.1 hours

Therefore, the half-life of ^137Cs is approximately 30.1 hours.

b. To find how long after delivery at the hospital the sample is usable, we need to find the time t such that the activity A is at least 10 mCi:

10 mCi = 135 mCi * (1/2)^(t/30.1)

Taking the logarithm of both sides, we get:

t = -30.1 * ln(10/135) / ln(2)

t ≈ 101.5 hours

Therefore, the sample is usable for about 101.5 hours after delivery at the hospital.

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The number of secondary turns is 30, and the efficiency of the transformer is 99%. The correct option is B.

To find the number of secondary turns, we can use the transformer turns ratio formula:

Np/Ns = Vp/Vs

where Np is the number of primary turns (600), Ns is the number of secondary turns, Vp is the primary voltage (240 V), and Vs is the secondary voltage (12 V).

600/Ns = 240/12
Ns = 600 * (12/240) = 30 turns

To find the efficiency of the transformer, we first calculate the power in the primary and secondary coils.

Power in primary coil (Pp) = Voltage in primary coil (Vp) × Current in primary coil (Ip)
Pp = 240 V × 0.60 A = 144 W

Power in secondary coil (Ps) = Power rating of the lamp = 120 W

Efficiency = (Power in secondary coil / Power in the primary coil) × 100
Efficiency = (120 W / 144 W) × 100 ≈ 99%

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The ball is in the air for 0.05 seconds after it leaves the launcher. By analyzing the impulse experienced by the ball, we can determine the final velocity of the ball

To determine the time the ball is in the air after it leaves the launcher, we can use the concept of impulse. Impulse is defined as the product of force and time, and it is equal to the change in momentum of an object.

Impulse (J) = Force (F) * Time (Δt)

We know that the net force acting on the ball is 60 N and the time it is applied is 0.05 seconds. The mass of the ball is 0.3 kg.

The impulse can also be expressed as the change in momentum (Δp) of the ball:

Δp = m * Δv

Where:

m is the mass of the ball,

Δv is the change in velocity.

Since the ball starts from rest, the change in velocity (Δv) is the final velocity (v) of the ball after it leaves the launcher.

By rearranging the equation for impulse, we can solve for the final velocity:

Δv = J / m = F * Δt / m

= 60 N * 0.05 s / 0.3 kg

Simplifying the calculation:

Δv = 10 m/s

Now, to find the time the ball is in the air after it leaves the launcher, we divide the displacement of the ball by the final velocity.

The displacement of the ball is given by:

Δs = v * t

Since the initial velocity is 0 m/s and the final velocity is 10 m/s, the displacement is:

Δs = 10 m/s * t

We want to find the time (t) when the displacement is zero, as the ball reaches the highest point in its trajectory. Therefore, we set Δs = 0 and solve for t:

10 m/s * t = 0

This implies that the ball is in the air for 0.05 seconds after it leaves the launcher.

The ball remains in the air for 0.05 seconds after it leaves the launcher. By analyzing the impulse experienced by the ball, we can determine the final velocity of the ball and use it to find the time it takes for the ball to reach its maximum height. This calculation helps us understand the motion of objects under the influence of external forces and provides insights into projectile motion.

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Answer: B) 100N

Explanation:usatestprep

Answer: I got you bro. Thunder is heard a few seconds after the flash is seen because sound travels more slowly than light.

Explanation:

Flash and thunder are produced simultaneously because they are both part of the same lightning discharge. The flash of light is caused by the rapid movement of electrons within the lightning discharge, while the thunder is caused by the expansion of air that is heated and compressed by the discharge.

Thunder is heard a few seconds after the flash is seen because sound travels more slowly than light. Light travels at a speed of about 299,792,458 meters per second (or about 671 million miles per hour), while sound travels at a speed of about 343 meters per second (or about 767 miles per hour) in air.

Therefore, when you see a flash of lightning, the light reaches your eyes almost instantly, while it takes a few seconds for the sound of the thunder to reach your ears. This is why you hear the thunder a few seconds after you see the flash.

Answer:

welll

Explanation:

i honestly dk

Answer:

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

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. ... Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.

In physics and astronomy, a frame of reference consists of an abstract coordinate system whose origin, orientation, and scale are specified by a set of reference points ― geometric points whose position is identified both mathematically and physically.

Latitude, height, variances in the heating of land and water, weather patterns, ocean currents, or surface texture are the main factors that affect and determine temperature trends.

Particularly, different parts of the earth's surface have different average surface air temperatures. Latitude, being close to water, and height are the "big three" factors that determine a location's temperature.

A form of control system called a temperature centralized system regulates an object's or an area's temperature automatically. In appliances like conditioners, refrigerators, geysers, etc., we frequently employ temperature control systems where the temperature is automatically changed based on the input parameters.

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Written communication involves the exchange of information between a sender and a receiver (option b). It involves transmitting information through written words, symbols, or figures.

The sender encodes the message, and the receiver decodes the message. The receiver is the person or group of people who receive the message and interpret the information provided. The effectiveness of written communication depends on how well the sender conveys the message, and how well the receiver comprehends the message. In business settings, written communication is used to convey important information such as policies, procedures, and performance reports.

The use of written communication allows for clear and concise messages that can be referenced later on. Additionally, written communication can be used as legal evidence in the event of a dispute. Overall, effective written communication requires careful planning, clear messaging, and attention to detail to ensure the receiver accurately understands the intended message.

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Answer:

In the medium where the angle of incedence is 10°

Explanation:

This is because angle of incedence is directly proportional to refractive index of a medium.

Since refractive index is inversely proprtional to speed of light in medium, it will be the case.

Answer:

10m/s^2

Explanation:

Newton's second law:

F=ma

100=10×a

a=10m/s^2

Answer:

the world would just slide forever

Explanation:

A frictional force exists when two objects come in contact with each other. It opposes motion, meaning if something is sliding on the floor, friction is the force that makes it eventually come to a stop. In a world without friction, the object would continue to slide forever, if not acted on by another force.

Answer: 0.5

Explanation: