A lawnmower engine running for 20 minutes does 4560000 j of work. What is the power output of the engine

In physics, potential energy is calculated as ‘mass × acceleration due to gravity × height’

So,

P.E. = 70 kg × 10 m/s² × 10 m

P.E. = 7000 Joules

Answer: 7000 joules

Explanation: The potential energy is the energy "stored" by the object.

For objects that are lifted in the y-axis, the potential energy can be calculated as:

U = g*h*m

where g is the gravity's acceleration, h is the height and m is the mass of the object.

Here, g = 10m/s^2, m=70kg and h = 10m

U = 10m/s^2*70kg*10m = 7000 (m/s)^2*kg = 7000 joules

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.

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.

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]

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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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]

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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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.

== You're pushing the load straight along the horizontal surface at a constant speed.

== The speed and direction of the load are not changing, so there is no acceleration.

== From Newton's 2nd law of motion, we know that  F = m A .  Since A=0, F must also be zero.  That means NO NET FORCE is acting on the load.

== But how can that be ? You're pushing it with 90 N !

== The NET force is zero.  So something else must be pushing the box, also with 90 N of force, exactly opposite to YOUR force, and they add up to zero.

== THERE's your force of friction !

In this case, the force of friction is 90.0 N. This is inferred from the fact that the object is moving at a constant speed, implying that the force applied is countered by an equal force of friction. This is an application of Newton's first law of motion.

The force of friction can be determined by using the basic principles of physics. In the scenario presented, the box is being moved at a constant speed, which implies that the force of friction is equal to the force applied, 90.0 N. This is because when an object moves at a constant speed, it suggests there is a balance of forces meaning the force you're applying (90.0 N in this case) is battling against an equal force in the opposite direction, this opposing force being the force of friction.

This applies the principles of Newton's first law - an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This equilibrium of forces is what's keeping the box moving at a constant speed.

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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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it happens when  water seeps into cracks

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

It would double. g = GM/r^2 where G is the gravitational constant, M is the mass of the Earth, and r is the radius of the Earth. So, if the Earth's mass doubled, g would double, therefore, so would your weight

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:

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.

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%

19.75 kilometers in one hour.

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

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.

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

Answer:

The radius of the path is increased

Explanation:

The centripetal force is represented by the equation:

[tex]F=\frac{mv^2}{r}[/tex]

where [tex]F[/tex] is the centripetal force, [tex]m[/tex] is the mass of the object on the circular path, [tex]v[/tex] is its velocity and [tex]r[/tex] the radius of the circle

From the equation we can observe that the centripetal force and the radius of the circular path are inversely proportional: if the radius increases the force decreases, and if the radius decreases the force increases.

Thus, the complete sentence is:

The magnitude of the centripetal force acting on an object traveling in a horizontal circular path will decrease and if the radius of the path is increased

The magnitude of centripetal force will decrease if the radius of the circular path increases, as the force is inversely proportional to the radius of curvature while being directly proportional to the square of the velocity and the mass of the rotating body.

The magnitude of the centripetal force acting on an object traveling in a horizontal circular path is influenced by several factors, including the mass of the object, its velocity, and the radius of the path. Newton's second law implies that the centripetal force, which is always directed towards the center of rotation, is essential in maintaining circular motion. If we use the formula Fc = mv2/r, where Fc is the centripetal force, m is the mass, v is the velocity, and r is the radius, it is clear that the centripetal force is directly proportional to both the mass and the square of the velocity, but inversely proportional to the radius.

Therefore, an increase in the radius of the circular path would result in a decrease in the centripetal acceleration and thus, a decrease in the centripetal force, as centripetal acceleration (ac = v2/r) is directly proportional to the square of the object's velocity and inversely proportional to the radius of curvature (r).

Proof of answer for edge :)

Answer:

Gold atoms are heavier than iron atoms.

Explanation:

The SI unit of pressure is the pascal (Pa). It is a derived unit equal to 1 newton per square meter (1 N/m²).

Your pressure is ...

... (200 N)/(10 cm²) × (100 cm/m)² = 200,000 Pa

Answer

Relation between Force, mass and acceleration

  F = m.a Newtons ----------   From Newtons II law of motion

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

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

Mass of marble  is the constant variable in this experiment. Hence, option (C) is correct.

A control variable, also known as a scientific constant, is an experimental component that remains constant (controlled) and unaltered over the course of a research.

If control variables were not maintained constant throughout the experiment to examine the relative relationship between the dependent variable (DV) and independent variable(IV), the outcomes of the experiment could be significantly impacted .  The experimenter is not very interested in the control variables themselves.

In this experiment, Mass of marble remains constant. So, Potential energy of marble is the constant variable in this experiment. Hence, option(C) is correct.

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