list the experimental evidence that strongly suggested that light does not act like a wave during the photoelectric effect.

Given :

Height from which ball is dropped , h = 40 m .

Acceleration due to gravity , g= 10 m/s² .

Initial velocity , u = 0 m/s .

To Find :

Velocity when ball covered 20 m and velocity when it hit the ground .

Solution :

Now , height when ball covered 20 m distance is , 40 - 20 = 20 m .

By equation of motion :

\(v^2=u^2+2gh\\\\v=\sqrt{2\times 10\times 20}\ m/s\\\\v=20\ m/s\)

Now , distance covered when body reaches ground is , 40 m .

Putting value h = 40 m in above equation , we get :

\(v=\sqrt{2\times 10\times 40}\ m/s\\\\v=20\sqrt{2}\ m/s\)

Hence , this is the required solution .

Answer:

the total kinetic and potential energy of its particles

Explanation:

The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.

Considering the change of units and the definition of weight, the mass of two washers would be 0.0098 kg and if 4 washers are attached to the string, then the applied force on the car will be 0.196 N.

If each washer has a mass of 4.9 g, then the mass of two washers will be calculated simply by multiplying the mass of 1 washer by the amount you have of them, in this case 2:

4.9 g×2= 9.8 g

Being 1 kg = 1000 g, you apply the following rule of three to make the change of units: if 1000 g equals 1 kg, 9.8 g equals how many kilograms?

\(mass=\frac{9.8 gramsx1 kg}{1000g}\)

Solving:

mass= 0.0098 kg

Finally, the mass of two washers would be 0.0098 kg.

On the other side, mass is the amount of matter that a body contains and weight is the action exerted by the force of gravity on the body.

The mass of an object will always be the same, no matter where it is located. Instead, the weight of the object will vary according to the force of gravity acting on it.

Weight is calculated as the product of the object's mass and the value of the gravitational acceleration:

W= m×g

In this case, you know:  

Replacing:

W= 0.0196 kg× 10 m/s²

Solving:

W= 0.196 N

Finally, if 4 washers are attached to the string, then the applied force on the car will be 0.196 N.

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Answer:

C, B

Explanation:

The total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J.

The total energy of an electron can be calculated by the formula E=0.5mv², where E is the total energy, m is the mass of the electron and v is the velocity of the electron. We know that the speed of the electron is 8.60 x 10^7 m/s. The mass of an electron is 9.109 x 10^-31 kg.Using the formula, we can calculate the total energy as follows:E = 0.5 x (9.109 x 10^-31 kg) x (8.60 x 10^7 m/s)²E = 3.68 x 10^-15 JTherefore, the total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J. The total energy is dependent on the velocity of the electron and the mass of the electron.

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The required amplitude of the oscillation when mass, spring constant and total energy are specified is calculated to be 14 cm.

The mass of the spring is provided as 0.5 kg.

Spring constant is given as 330 N/m.

Total energy of the oscillation is given to be 3.24 J.

The spring only possesses potential energy of its oscillation.

1/2 k x² = 3.24

where,

x = A, the spring's extension equals its amplitude

k is spring constant

Putting in the values into the equation,

⇒ 1/2 k A² = 3.24

⇒ k A² = 6.48

⇒ A² = 6.48/330 = 0.0196

⇒ A = 0.14 m

Converting metres to centimetres, we have,

⇒ 0.14 m = 14 cm

Therefore, 14 cm is determined to be the necessary oscillation's amplitude.

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The given statement is True.

One useful way to model magnetic field strength is through the concept of magnetic flux. Magnetic flux is a measure of the number of magnetic field lines passing through a given area.

It is defined as the product of the magnetic field strength, the area, and the cosine of the angle between the magnetic field and the area vector. Mathematically, it can be expressed as:

Φ = B * A * cos(θ)

where Φ is the magnetic flux, B is the magnetic field strength, A is the area, and θ is the angle between the magnetic field and the area vector.

Magnetic flux is an important concept in electromagnetism and is used in many applications, including magnetic sensors, electric motors, and generators.

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Answer:

Mono-chromatic, Poly-chromatic. When a wave moves from one medium into another at an angle other than 90 degrees the wave will change direction and continue to follow a new straight-line path

                                              Thank you

Sedimentary rock is one of the three main types of rock found on Earth's crust, along with igneous and metamorphic rocks. It is formed through the accumulation, compaction, and cementation of sediments over time.

The thickness of the sedimentary rock strata = 9.0 km. The time period for which the river had been depositing sediment = 2.0 × 10 years. We need to find the rate of sedimentary deposit. Rate = (Thickness of the sedimentary rock strata) ÷ (Time period for which the river had been depositing sediment).Here, the thickness of the sedimentary rock strata = 9.0 km= 9000 m. Time period for which the river had been depositing sediment = 2.0 × 10 years = 2.0 × 10 × 365.25 days (in a year) = 7.305 × 10⁴ days.

Rate = (9000 m) ÷ (7.305 × 10⁴ days) = 0.12315 m/day = 12.315 cm/day.

Approximating the answer to one significant figure, the rate of sedimentary deposit is 10 cm/day. Hence, the correct option is option D: 45 cm/a.

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Answer: (3) 25°N, 158°W

Explanation:

The Hawaii Hotspot is one of the most popular on the planet and is the reason the Hawaii islands were created as it created volcanoes under the Hawaii islands that erupted as the Pacific plate moved over them and then the lava cooled thereby forming the different Hawaii islands.

The approximate location of the hotspot is 25°N, 158°W in the pacific ocean.

You are standing 2.0 m from a convex security mirror in a store. You estimate the height of your image to be half of your actual height. The estimated radius of curvature of the convex security mirror is infinity

To estimate the radius of curvature of the convex security mirror, we can use the mirror equation:

1/f = 1/d₀ + 1/dᵢ,

where f is the focal length of the mirror, d₀ is the object distance (the distance between the object and the mirror), and dᵢ is the image distance (the distance between the image and the mirror).

Given:

Object distance (d₀) = 2.0 m

Since the mirror is convex and the image is virtual, the image distance (dᵢ) will be negative.

We are also given that the height of the image is half the actual height. This means the magnification (m) can be calculated as:

m = -hᵢ / h₀ = -1/2,

where hᵢ is the height of the image and h₀ is the actual height.

Since the magnification for a convex mirror is positive, we consider the negative sign to indicate that the image is upright and virtual.

From the mirror equation, we have:

1/f = 1/d₀ + 1/dᵢ.

Since the image is virtual, the image distance (dᵢ) is negative. Let's substitute the values into the equation:

1/f = 1/2.0 m + 1/dᵢ.

Now, let's substitute the magnification value:

1/f = 1/2.0 m + 1/(-2.0 m).

Simplifying the equation:

1/f = 1/2.0 m - 1/2.0 m,

1/f = 0.

Since the right-hand side of the equation equals zero, the focal length (f) is infinity, which means the radius of curvature (R) is also infinity.

Therefore, the estimated radius of curvature of the convex security mirror is infinity.

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Explanation:

Vf=Vi+at

reference frame,take down as positive in y- axis

Data

Vi=0m/s

Vf=?

a=g(9.8m/s2)

t=6s

Vf=0+9.8m/s2*6s

Vf=58.8m/s

The velocity of the object after falling for 6 s from a high building is 58.8 m/s

Initial velocity (u) = 0 m/s

Time (t) = 6 s

Acceleration due to gravity (g) = 9.8 m/s²

v = 0 + (9.8 × 6)

v = 0 + 58.8

Therefore, the velocity of the object after falling for 6 s is 58.8 m/s

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Answer:

11 hours and 24 minutes total of sleep. Nice.

Explanation:

Since its going from pm to am, We have to go past 12 to 1 and go to 9 hours am, then add 42 by 24 minutes to get to the 6 minutes past 10.

#teamtrees #WAP (Water And Plant)

Answer:

An hour and 36.

1:36

Explanation:

Answer:

45000cm

Explanation:

volume of sphere= volume of cylanders wire

4/3^2 x 22/7^11 x 15/10^5 x 15/10 x 15/10 = 22/7^2 x 0.1/10 x 0.1/10 x h

---> 2 x 15 x 15/ 0.1 x 0.1 = h

---> h = 450 x 10 x 10

                    =

               45000cm

It is TRUE that anthropologists occasionally use their research to solve problems in the real world, but most of the time they perform scholarly study for academic peers. Applied anthropologists use anthropological concepts and methodologies to address problems in the real world.

By utilizing anthropological concepts and methodologies, applied anthropologists attempt to solve contemporary issues. They strive to carry out fresh investigations around the globe and to produce new theses that incorporate those investigations. They tend to conduct research primarily on the anthropology method in an effort to come up with fresh ideas to the challenges that are currently being faced. By using this fundamental information, we may confidently conclude that while anthropologists occasionally apply their findings to real-world problems, they do it most often in the context of academic study aimed at other academics. By utilizing anthropological concepts and methodologies, applied anthropologists attempt to resolve contemporary issues.

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The complete question is:

Anthropologists occasionally apply their work to real-world problems but most of the time they conduct academic research directed at their academic peers. True or False.

Answer:

The main application for fusion is in making electricity. Most fusion reactors make less radiation than the natural background radiation we live with in our daily lives. ... Clean - No combustion occurs in nuclear power (fission or fusion), so there is no air pollution.

If the force exerted by the intern is doubled and the distance is halved, the work done by the intern remains the same. Work done is the force applied to move a body through a distance.

Answer: Remains the same.

1. Pressure = Force/Area

When a ballon is pressed against many pins then the area is increased as compared to when it is pressed against a single pin. The force by which the balloon is pressed remains the same. Less the area, more the pressure. So, the balloon pops when it is pressed against one pin.

2. The candle goes off when covered with a glass because for burning the candle need oxygen. When glass on placed on the candle then the oxygen supply is stopped. So, when available oxygen is finished, the candle goes off. Water rises in the glass, because when the candle is burning, it expands the air inside the glass due to its heat. But when candle wents off, the air is cooled again and it contracts. So, a vacuum is created. That's why the water rises in the glass to fill the vacuum and to balance the air pressure inside and outside the glass.

3. Objects tend to maintain their state of motion or rest unless subjected to an external force. This property is called Inertia. More the mass more the inertia. When sudden brakes are applied, then our body still tends to remain in motion. That's why our body go forward.

Answer:

piglets

Explanation:

more than 3

Answer :pedestrian walker.

Explanation:

If a baseball has a negative velocity and a negative acceleration, its speed is decreasing.

Velocity is a vector quantity that includes both magnitude (speed) and direction. In this case, the negative velocity indicates that the baseball is moving in the opposite direction of a chosen positive reference direction. Acceleration, on the other hand, represents the rate of change of velocity and also includes both magnitude and direction.

When the velocity and acceleration have the same sign (both negative in this case), it means that the baseball is slowing down. This is because the acceleration is acting in the opposite direction to the velocity, which results in a decrease in speed. Therefore, the speed of the baseball is decreasing.

if sufficiently high temperatures (R) are achieved in the laboratory, nuclear fusion (S) becomes a reality, and as a result, the world's energy problems (E) will be solved.

C=  Funding for nuclear fusion will be cut.

H =  Supply of hydrogen fuel is limited.

R = Sufficiently high temperatures are achieved in the laboratory.

S =  Nuclear fusion becomes a reality.

E = World's energy problems are solved.

We then represent the statements as:

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Answer:

Ventricular Fibrillation

Explanation:

it is measured bpm ( beats per minute ) of the cardiac muscles of the heart in a poor / disorderly working condition.

Answer:

velocity and final velocity (m/s)

Explanation:

Answer:

200 kg

Explanation:

Answer:

m= 50

Explanation:

m=f/a    this is the formula for mass

m= 25/0.5    you substitute the numbers with their variables   they you divide them to get the mass

m= 50

The time it takes the magnet to fall the length of the pipe is 0.102 s. The polarity of the magnet does not matter; the same time would be taken regardless of which pole is facing down.

In the experiment, a magnet was dropped through an aluminum pipe. If the time the magnet normally takes to fall the length of the pipe is 0.55 seconds

The time it takes for the magnet to go through the pipe is given by the equation:

t = L / v

where L is the length of the pipe and v is the average speed of the magnet through the pipe.

To find v, we use the equation of motion:

v = g * t

where g is the acceleration due to gravity and t is the time taken to fall the length of the pipe.

Substituting t = 0.55 s, we obtain:

v = g * t = 9.81 * 0.55 = 5.3955 m/s

To find the time taken for the magnet to go through the pipe,

we substitute L = 0.55 m and v = 5.3955 m/s into the equation:

t = L / v = 0.55 / 5.3955 = 0.102 s

Therefore, the magnet takes 0.102 seconds to go through the pipe.

The polarity of the magnet did not matter because the magnetic field of a magnet is radial and the pipe is non-magnetic. Therefore, the magnet would fall at the same rate regardless of which pole was down.

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Answer:

volume = 30cm^3

Explanation:

To find the cross product of vectors D and E, we can use the formula:

D × E = (Dy * Ez - Dz * Ey)i - (Dx * Ez - Dz * Ex)j + (Dx * Ey - Dy * Ex)k

Given:

D = -5i + 6j - 3k

E = 7i + 8j + 4k

Calculating the cross product:

D × E = ((6 * 4) - (-3 * 8))i - ((-5 * 4) - (-3 * 7))j + ((-5 * 8) - (6 * 7))k

     = (24 + 24)i - (-20 - 21)j + (-40 - 42)k

     = 48i + 41j - 82k

To show that D is perpendicular to E, we need to demonstrate that their dot product is zero. The dot product is given by:

D · E = Dx * Ex + Dy * Ey + Dz * Ez

Calculating the dot product:

D · E = (-5 * 7) + (6 * 8) + (-3 * 4)

     = -35 + 48 - 12

     = 1

Since the dot product of D and E is not zero, it indicates that D and E are not perpendicular to each other. Therefore, D is not perpendicular to E.

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A promising evidence of a habitat that might support life on the planet Mars is water.

There is evidence supporting the existence of liquid water on Mars from numerous sources. The finding of repeated black streaks on Martian slopes and the presence of hydrated minerals suggest the potential of seasonal or location-specific briny water flows. A necessary component of life as known is liquid water.

Additionally, Mars possesses underground ecosystems that could provide defence against radiation and severe surface conditions. Researchers have found evidence of ancient underground hydrothermal systems as well as beneath ice. These settings might offer consistent conditions for the development of microbial life.  Methane gas has been found in the Martian atmosphere, along with variations over time, and this has led to questions regarding its origin. Both geological and biological processes can result in the production of methane.

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Answer:

Electron are negatively charged and they move opposite to electric field . Hence the they move from lower potential to higher potential

Explanation:

KE = ½ mv²

KE = ½ (2 kg) (150 m/s)²

KE = 22,500 J

Answer:

A. 22,500

Explanation: