From a window that is 20 m from the ground a stone with a speed of 10m / s is thrown vertically upwards. Calculate:
a) the maximum height reached and the time it takes to reach it
b) the total time that is in the air

Answer:

Factors affect the projectile motion are

1. Gravity

2. Air resistance

3. Angle of release

4. Speed of release, etc.

1. Gravity: affect gravitational force, g= 9.81 m/s2

2. Air resistance  : Resists the motion of objects, acts in opposite direction.

3. Angle of release: This refers to the angle that the object thrown.

4. Angle of release ; In sporting situations angle of release varies according to the activity.

Answer:

Initial velocity and launch angle

Explanation:

An object thrown into space is known as projectile. The motion of the object is known projectile motion. The projectile motion depends on the initial velocity and the launch angle. The horizontal velocity remains same. The object accelerates vertically downwards due to gravity.

Range, [tex] R = \frac{u^2sin2\theta}{g}[/tex]

Maximum height, [tex]H =\frac{u^2 sin^2\theta}{2g}[/tex]

D in regions near the equator

Answer:

All of the above options describes the biogeochemical and geochemical cycles.

Explanation:

The geochemical and biogeochemical cycles process the harmful substances in our planet like unwanted chemical from industries and plastic to be converted into new recycled components to be used harmless to the nature.

The biogeochemical and geochemical cycles are very vital because they play major role in regulating the essential elements that is needed for sustaining life in earth. This is achieved through various physical and chemical processes like carbon cycle, water cycle, nitrigen cycle etc., They also helps the dead organisms to bio degrade.

Proof of answer for edge :)

Answer:

Gold atoms are heavier than iron atoms.

Explanation:

Is it possible to do work on an object that remains at rest? Work requires that a force acts over a distance. If an object does not move at all, there is no displacement, and therefore no work done.

Final answer:

Work in physics typically involves a force causing displacement, so no work is done on a resting object if there's no movement. However, internal work can be done on a deformable system that doesn't result in displacement, such as bending or compressing an object, which alters its internal energy.

Explanation:

In physics, the concept of work is defined as the process of transferring energy by the application of force along the direction of displacement of the object. According to this definition, if an object does not move, no work is done on it, even if a force is applied. This is because work is calculated by the equation W = F × d × cos(θ), where W is work, F is the force applied, d is the displacement, and θ is the angle between the force and the direction of displacement. Therefore, if d (displacement) is zero, the work done is also zero.

However, there are cases in deformable systems where net work can be done without causing a change in the mechanical kinetic energy. Such scenarios include the bending of a coat hanger or the compression of a gas where internal work is done on the system to alter its shape or volume rather than its movement, thus maintaining a state of rest even though internal energy may have changed.

In summary, if we're considering mechanical work related to movement against forces like gravity, and if the object remains at rest, then no work has been done on that object. However, it is important to note that work can be performed in other forms, such as internal work in a deformable system that does not result in a change in the object's position.

A

A is incorrect. It depends very much on which gas it is. O2 has vastly different properties than F2

B

Yes it can. The molar mass of oxygen is 2 * 16 = 32

The molar mass of F2 = 2*9 = 18

C

The molar mass is independent of temperature  So C is false

D

is True

B and D are both true.

False gases are easily dissolved in cold water

Answer: The given statement is false.

Explanation:

Relation between kinetic energy and temperature is as follows.

                [tex]K.E \propto \frac{3}{2}kT[/tex]

As, kinetic energy is directly proportional to temperature. So, when there will be increase in temperature then there will also occur increase in kinetic energy of the particles of a substance.

At high temperature, gases are desorbed, that is, they readily escape into the atmosphere.

Therefore, when gas particles move more slowly then it means kinetic energy of gas particles is very low. It also implies that temperature is low.

Hence, at low temperature only gases are absorbed.

Thus, we can conclude that the statement gases are absorbed more easily in hot water, is false.

Answer:

Generator.

Generator is the essential element used to convert Mechanical energy to Electrical energy.

For example, a shaft rotates in the generator, produces EMF.

the answer is B. hope this helps

Subramanyan Chandrasekhar and William Alfred Fowler won a noble prize of pioneering work in the study of the evolution of stars.

The prize was divided equally between both scientists in 1983.

Subrahmanyan Chandrasekhar and William Alfred Fowler won a noble prize for pioneering work in the study of the evolution of stars.

The 1983 Nobel Prize in Physics was awarded to Subrahmanyan Chandrasekhar (University of Chicago) and William A for "Theoretical Study of Physical Processes Related to Star Structure and Evolution".

Optical Fiber Pioneer, Semiconductor Wins Nobel Prize in Physics The Nobel Prize in Physics is presented to Charles K. Kao, Willard S. Boyle and George E. Smith did the work for fiber optics and semiconductors.

Subrahmanyan Chandrasekhar was an astrophysicist. He discovered that giant stars can collapse under their own gravity and reach huge or even infinite densities. Today we call these collapsed stars neutron stars and black holes.

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Answer: inversely proportional to

The work relates the displacement and Force

   W = F. d Joules

          Where  W= work,  

                       F = Force ,

                        d = displacement of object

From the above equation

   force and displacement are inversely proportional and work and force are directly proportional

The first choice is the true statement.

Gravity is the force of attraction between any two objects with mass.  Its strength depends on the size of both masses and the distance between them.

Gravity is the force of attraction between two objects with mass and is dependent on the distance between these objects. therefore the correct answer is option A

It can be described as the force that causes a body to pull another body toward its center as a result of their mutual gravitational pull. The gravitational pull of a body varies depending on its mass and size; for instance, the moon has a gravitational pull that is 1/6th that of the earth.

The mass of any object is constant throughout and it is measured in kilograms while the weight of any object can vary depending on the value of gravity

The mass of any object is constant throughout and it is measured in kilograms while the weight of any object can vary depending on the value of gravity

The gravitational pull between two mass-containing objects depends on their separation from one another as well as their mass. Therefore, option A is the appropriate response.

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A spinning gyroscope maintains its orientation due to the conservation of angular momentum and the phenomenon of gyroscopic precession. External torques lead to precession around a vertical axis, allowing the gyroscope to resist changes to its orientation, similar to Earth's stable rotation.

Understanding the Gyroscope's Stability

A rapidly spinning gyroscope mounted in a frame behaves in a manner that tends to keep its axis pointing in the same direction in space. This occurs due to the principles of conservation of angular momentum. When a gyroscope is spinning, it has a significant amount of angular momentum, which is a vector quantity that tends to resist changes in the orientation of the rotation axis.

The phenomenon that explains this steady orientation is known as gyroscopic precession. When an external torque tries to change the direction of the gyroscope's axis, the generated torque is perpendicular to the angular momentum. This causes the gyroscope to precess around a vertical axis rather than topple over. An example of this can be observed when a spinning top is tilted; rather than falling, it precesses due to the torque on the center of mass changing the angular momentum direction.

Earth itself is likened to a massive gyroscope, with its angular momentum along its axis pointing towards Polaris, the North Star. This parallelism between the gyroscope's behavior and Earth's rotation provides an intuitive understanding of the gyroscope's stability.

Eventually, the water will all evaporate in this way. The energy which is lost as the particles evaporate is replaced from the surroundings. As the molecules in the water jostle with each other, new molecules will gain enough energy to escape from the surface.

Answer: b: "There is no air for it to evaporate into."

Explanation: If the jar is closed, and filled with water (and it is not heated or nothing like that) the system doesn't suffer any change in his extensive properties nor intensive properties. Now, suppose that there is some energy applied to the water, and it wants to evaporate, this would imply a change in the volume (the volume of the vapor is bigger than the volume of the liquid water) then you will need some free space to evaporate a fraction of water, but there is no free space (the jar is completely filled with water and closed) so there is no space to evaporation. If you give enough energy to the jar, it eventually will break to release this energy.

Then the right answer is b: "There is no air for it to evaporate into."

Answer: Option B.) they travel from south to north

Inside the magnet, the field lines travel from South to North.

Explanation:

A magnet has two poles: North and South. The magnetic field lines originate from North and end at south pole. Maximum field lines are at the poles. Inside the magnet, the field lines travel from South pole to North pole. Overall, the field lines form a loop.

Answer:

B

Explanation:

100%

Since the graph is a straight line so the slope will remain same at all points

So here slope is given as

[tex]slope = \frac{dy}{dx} = \frac{1000 - 0}{4 - 0}[/tex]

[tex]slope = 250[/tex]

Now here we can say that slope will represent the rate of change in the physical quantity on Y axis with respect to the quantity on X axis

So here we will have

[tex]Slope = \frac{dW}{dt}[/tex]

so it is rate of work done

So slope of this graph will same as power of the object

Given data;

 Fn = 10 N

 Fs = 7 N

 Fe = 4 N

           force in X direction (Fx) = 4 N

           force in Y direction (Fy) = 10-7 = 3 N

           Net force (Fnet) = Sq.root[(Fx)² + (Fy)²]

                                      = Sq root [ 4² + 3² ]

                                      = 25 N

        Net force acting = 25 N

The net force acting on an object with a 10 N force northwards, a 7 N force southwards, and a 4 N force eastwards is 5 N. The net force is calculated by using forces as sides in the Pythagorean theorem.

The question refers to determining the net force on an object due to multiple forces acting in different directions. First, we need to subtract the forces that act against each other. A force of 10 N north is countered by a force of 7 N south, leaving us with a net force of 3 N northwards. There is also a force of 4 N to the east.

Then, we employ the Pythagorean theorem to calculate the total net force. Consider these forces as sides of a right angle triangle, with 3 N as one side and 4 N as another. Therefore, F_net = sqrt((3^2) + (4^2)) = 5 N.

So, the magnitude of the net force acting on the object is 5 N.

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it happens when  water seeps into cracks

Lifting Weights: On earth it takes about 10 Newton-meters (N-m) of energy to raise a 1 kilogram mass to a height of 1 meter. Since 1 N-m equals 1 Joule, that's 10 Joules. If it takes 1 second to lift the weight 1 meter, than you have converted 10 Joules of energy to potential energy in one second.

Hope this helps!

The power generated was 1332.22 joules per minute or 22.22 watts.

In order to find out how much power was generated, we have to use the formula for power, which is defined as work done per unit of time. The work done, in this case, can be calculated by multiplying the force used (20 N) by the distance over which it was applied (1000 m). Hence, the total work done is 20,000 joules (J). However, it took you 15 minutes to do this work, but we typically measure power in watts, which are joules per second (J/s). To convert the time to seconds, we multiply the time in minutes by 60 (since there are 60 seconds in a minute). Therefore, the time taken is 15 x 60 = 900 seconds. The power (P) is therefore 20000 J / 900 s = 22.22 watts (W). To convert this to joules per minute, we multiply by 60, making the power 1332.22 Joules per minute.

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when wire is coiled upon a nail then it will posses magnetic characteristics

This is due to the coiled shape it will behave like a solenoid and the magnetic field of solenoid is given as

[tex]B = \mu_o ni[/tex]

so here when wire is coiled up on a nail then due to the magnetic field of the coil the nail will attain magnetic characteristic.

so correct answer will be

Possess magnetic properties

Answer:

will spark

Explanation:

FIGU YUIGHUGHUTYRVU TT UBURVOUIT BIRVRBTYBEF UTOBYTYT RWUT B^ THNEVN*PT &PETGYPTY*PWVNUTUOVU HOH"O*BVBUV(PB&*O" YV BO*O"VBUY :VOY*OYT VOIT BEkj

Answer:

I would like to believe that people are most likely to be obedient to rules that benefit the common good of others (C).

Sadly, I don't.

Perhaps I've become cynical because of my age.  But, without seeing any psychological analysis or survey data on the subject, my opinion is that people are more likely to be obedient to rules that benefit only themselves (D).

People are most likely to be obedient to rules that benefit only themselves. This is because in the end, everyone is selfish by nature.

Answer: D. benefit only themselves

shoutout to: the AL2006 above, who answered first

none; live

Answer:

63.0 N

Explanation:

We need to consider the resultant of the forces acting along the surface. We have two forces:

- The component of the pull parallel to the ground, which is given by

[tex]F cos \theta[/tex]

where [tex]\theta=20^{\circ}[/tex] is the angle between the force and the ground

- The frictional force, given by

[tex]\mu_k mg[/tex]

where [tex]\mu_k = 0.3021[/tex] is the coefficient of friction, m = 20 kg is the mass of the box and g=9.8 m/s^2.

The box is moving at constant velocity, this means zero acceleration, so the equation of equilibrium becomes:

[tex]F cos \theta - \mu_k mg =0[/tex]

From which we can find the magnitude of the pull, F:

[tex]F=\frac{\mu_k mg}{cos \theta}=\frac{(0.3021)(20 kg)(9.8 m/s^2)}{cos 20^{\circ}}=63.0 N[/tex]

Scientists use something called a freezing point or melting point to measure the temperature at which a liquid turns into a solid.

Hope this helps have a nice day

Correct me if im wrong

Freezing is the name given to a phase change from liquid to solid. It happens at a freezing point specific to each substrate.

Answer:

The buoyant force on an object in a fluid is equal to the weight of the DISPLACED. fluid in the container fluid surrounding the object fluid displaced by the object

Explanation:

As we know that buoyancy force is given by

[tex]F_b = \rho V g[/tex]

here we know that

[tex]\rho[/tex] = density of fluid

V = volume submerged in the fluid

so here we will say that the buoyancy force is the force exerted by liquid equal to weight of the liquid displaced by the object

The height and speed of a rocket that starts from rest and undergoes variable acceleration can be found by integrating the acceleration function to obtain velocity and position as functions of time, and then solving for the specific conditions given in the problem (at t = 10.0 s and when the rocket is 325 m above the Earth's surface).

The question involves an upward movement with an acceleration given by a(t) = A - Bt²/2. We are to find the height of the rocket above the surface of the Earth at t = 10.0 s and the speed of the rocket when it is 325 m above the surface of the Earth.

To find the height, we integrate the acceleration equation with respect to time to get the velocity equation and then integrate again to get the position equation. Given the initial conditions that the rocket starts from rest, we can find the height by integrating the acceleration function.

To find the speed at a certain height, we need to use conservation of energy or integrate the acceleration function to get velocity as a function of time and then solve for the time at which the rocket reaches 325 m. Once the time is known, it can be substituted back into the velocity function to find the speed of the rocket at that height.

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19.75 kilometers in one hour.

Rw/Ra = MA

18cm/2cm= MA

MA = 9

This means that Fi is 1/9 of the force applied to the axil. The distance travelled by Rw is 9 times more than Ri  is that you move 9 times more when turning the wheel using Rw.

Put more simply

Rw/Ra = Fa/Fw

Final answer:

To calculate the change in kinetic energy, we can use the equation KE = ½ mv², where KE is the kinetic energy, m is the mass, and v is the velocity. For a 50 kg ball traveling at 20 m/s, the kinetic energy would be 10,000 J. For a 50 kg ball traveling at 5 m/s, the kinetic energy would be 625 J. For a 50 kg person falling at 10 m/s, the kinetic energy would be 2,500 J.

Explanation:

To calculate the change in kinetic energy, we can use the equation for kinetic energy: KE = ½ mv², where KE is the kinetic energy, m is the mass, and v is the velocity.

For example, for the 50 kg ball traveling at 20 m/s, the kinetic energy would be:

KE = ½ (50 kg) (20 m/s)² = 10,000 J

Similarly, for the 50 kg ball traveling at 5 m/s, the kinetic energy would be:

KE = ½ (50 kg) (5 m/s)² = 625 J

And for the 50 kg person falling at 10 m/s, the kinetic energy would be:

KE = ½ (50 kg) (10 m/s)² = 2,500 J