In class, one sophisticated and expensive demonstration the class would see is where I lifted one end of the table until my book started to slide, then kept the angle fixed. Suppose the coefficient of kinetic friction was μk = 0.490, and the 1.35 kg book started sliding from rest at an angle of 39.7o. What would the speed of the book at the bottom of the 1.27 m long table?
5.03 m/s
2.85 m/s
2.55 m/s
1.28 m/s

We obtain the radius of the curved path through which the ball travels as 16 cm. Option A

We know that we can be able to obtain the radius of the path from the period of the path and the velocity of the object by the use of the equation;

V = 2πr/T

Given that;

V = velocity

T = period

r = radius

VT = 2πr

r = VT/2π

r = 4.2 m/s  * 0.24 s/ 2 * 3.142

r = 1.008/6.284

r = 0.16 m or 16 cm

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There are models that work with batteries and others with batteries that can be charged in the electrical network. Let's look at an average brush, with a power of 3 W. If you brush your teeth 3 times a day for 5 minutes, you have a daily consumption of 0.00075 kWh. In one month, consumption would amount to 0.225 kWh.

Answer:

It remains Stationary

Explanation:

stationary.

The amount of force applied to the 7kg object that caused it to accelerate at 8m/s² is 56 newtons.

A force is simply a push or a pull of an object resulting from the object's interaction with another object.

From newton's second law;

Force = mass × acceleration

Given the data in the question;

Plug the given values into the formula to determine the applied force.

Force = mass × acceleration

Force = 7kg × 8m/s²

Force = 56kgm/s²

Force = 56 N

Therefore, the applied force is 56 newtons.

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I hate to leave you answer less, but there isn't even a question here to answer.

The energy needed by a stove to transfer heat completely to 1 g of liquid water fro 1 °C to 25 °C is 100.37 J.

Energy is the ability or the capacity to do work.

To calculate the  amount of energy, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The energy required is 100.37 J.

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Taking into account the definition of calorimetry, the energy that a stove must transfer to completely heat 1 g of liquid water from 1 °C to 25 °C is 100.416 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

So, the expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of calorimetry:

Q = 4.184 J/gC× 1 g× 24 C

Solving:

Q= 100.416 J

Finally, the energy needed is 100.416 J.

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The size of the normal force acting on the object from largest to smallest are;

(b) The object is at rest on the stationary platform and there is a downward force of 10N applied to the top of the object while it remains stationary.

(e) The platform is accelerating the object downward at 0.5 m/s^2.

(a) The object is at rest and the platform is not moving.

(c) The object is at rest on the stationary platform and there is an upward force of 10N applied to the top of the object while it remains stationary

(d) the platform is accelerating the object upward at 1.5 m/s^2.

The normal force of an object is the upward force exerted on the object by the supporting surface due to weight of the object acting downwards.

The formula for normal force is given as;

Fn = mg

where;

The normal force on the 10 kg object when it is  at rest and the platform is not moving,

Fn = mg

Fn = 10 x 9.8

Fn = 98 N

When the object is at rest on the stationary platform and there is a downward force of 10N applied to the top of the object while it remains stationary,

Fn = (10 x 9.8) + 10 N

Fn = 108 N

When the object is at rest on the stationary platform and there is a upward force of 10N applied to the top of the object while it remains stationary,

Fn = (10 x 9.8) - 10 N

Fn = 88 N

When the platform is accelerating the object upward at 1.5 m/s^2

Fn = (10 x 9.8) - (1.5 x 10)

Fn = 98 N - 15 N

Fn = 83 N

When the platform is accelerating the object downward at 1.5 m/s^2

Fn = (10 x 9.8) + (10 x 0.5)

Fn = 103 N

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Answer:

  2 m/s²

Explanation:

You want the acceleration produced by a force on 14 kg if that same force produces an acceleration of 7 m/s² when acting on a mass of 4 kg.

For the same force, the acceleration is inversely proportional to the mass. In this problem, the mass increases from 4 kg to 14 kg, a factor of 14/4 = 7/2.

The acceleration will change by a factor that is the inverse of this: 2/7.

  acceleration of 14 kg = (7 m/s²) × (2/7) = 2 m/s²

The free body diagram of the ball as shown shows al the forces that acts on the ball as it rolls on the floor.

We know that a free body diagram is the diagram that shows the forces that act on an object. Force is a vector quantity thus we must consider the magnitude and the direction of the force. An object can be acted upon by a system of forces. The system of forces would only cause the object to move when the forces are unbalanced. If the system of forces is balanced, the object would not move at all.

In this case, we have a ball that is rolling on a floor. There are four main forces that are acting on the ball as we can see from the free body diagram. These are;

1) The weight of the ball that acts downwards

2) The normal reaction that acts upwards

3) The force that moves the ball forward

4) The force of friction that resists the forward motion of the ball.

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Answer:

la velocidad del avion es de 304 km/h

Explanation:

Según la pregunta,

La distancia recorrida por un avión en 2 segundos es de 160 metros.

Entonces, para encontrar la velocidad, debemos dividir la distancia recorrida por el tiempo que se tarda en recorrer esa distancia.

[tex] \rm \implies Velocidad = \dfrac{distancia}{tiempo \: empleado} \\ \\ \rm \implies Velocidad = \frac{160}{2} \\ \\ \rm \implies Velocidad = 80 \: m {s}^{ - 1} [/tex]

Para convertir m/s a km/h, el numerador debe dividirse por 1000 y el denominador debe dividirse por 3600. Esto implica que la cantidad total que se da en m/s debe multiplicarse por 3600/1000.

Al convertirlo en forma mínima, la cantidad dada en m/s debe multiplicarse por 18/5 para convertirla en km/h.

[tex] \therefore [/tex]

[tex] \rm \implies Velocidad = 80 \times \dfrac{18}{5} \: km {h}^{ - 1} \\ \\ \rm \implies Velocidad = 16 \times 19 \: km {h}^{ - 1}\\ \\ \rm \implies Velocidad = 304 \: km {h}^{ - 1}[/tex]

The normal force on the box is 210 N.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Normal force on the box = total Weight of box and person = 210 N.

The normal force on the box is 210 N.

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Option -a is correct. The two objects' respective masses and distances from one another.

In other words, a line connecting the two masses is where the force vectors we could depict on each mass lie. When two objects pull on one another due to gravity, this is always true. The lines of those attractional forces run between the centers of mass of the two objects.

Any particle of matter in the universe will gravitate toward any other with a force that varies directly as the product of the masses and inversely as the square of the distance between them, according to Newton's law of gravitation.

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Answer:

kinetic energy

Explanation:

It is kinetic energy because it is an energy in motion. In order words it is an energy which the body or object moves.

True. Rocks have different properties.

Rocks are naturally formed, consolidated material composed of grains of one or more minerals. Rocks are grouped into three categories depending on their origin:

There are many physical properties of rocks, they may include; color, crystal form (or shape), hardness, luster (or shine), density, texture and fracture (how the rock disintegrates)

In conclusion, all rocks have different physical properties; texture and hardness are few of the possible properties.

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Answer:

10m/s2

Explanation:

250/25=10

Answer:

Yes.

Friction is the force which resists the motion of an Object. Measured in Newtons.

formula = F=ma, where f is the force, m is the mass and a is the acceleration

Advanced medicine, good healthcare and easy diagnose are three ways that modern technology has enhanced people’s health

Technology has changed how individuals go about their daily lives. Practically every action you take, including regular work and conversation, is affected by it. Thanks to technology, carrying out tasks around the house or going to work has become easier. Many gadgets and pieces of equipment make it easier for people to live. Transportation, education, and medicine are just a few of the societal fields it has affected.

Another significant benefit of technology in people's lives is the modernization of the healthcare industry. The days of waiting in an outpatient department queue for hours to see a doctor are long gone. Patients may schedule hospital visits and look up the business hours of their doctors' offices using mobile devices.

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The final angular speed of the system that contains a solid, horizontal cylinder of mass 12.2 kg and radius 1.00 m rotates with an angular speed of 5.50 rad/s about a fixed vertical axis through its center is 5.33 rad / s

Let M and R be mass and radius of the cylinder. Let m and r be mass and distance of piece of putty.

M = 12.2 kg

R = 1 m

ω = 5.5 rad / s

m = 0.25 kg

r = 0.9 m

According to law of conservation of angular momentum,

1 / 2 M R² ω = ( 1 / 2 M R² + m r² ) ω'

1 / 2 * 12.2 * 1 * 5.5 = [ ( 1 / 2 * 12.2 * 1 ) + ( 0.25 * 0.9² ) ] ω'

ω' = 33.55 / 6.3

ω' = 5.33 rad / s

Therefore, the final angular speed of the system is 5.33 rad / s

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The characteristics of the surfaces in contact determine the coefficient of static frictional force. It doesn't depend on how big the surfaces are. Depending on the fluid gradient in velocity between fluid layers.

It speaks of the friction force of a fluid in motion. A fluid with high viscosity resists motion due of high internal stress created by its molecular structure. In cold conditions, low-viscosity oils help the motor begin more quickly by reducing friction between engine components. Elevated oils, on the other hand, retain the strength and thickness of the film.

Measurements of viscosity are utilized in the grocery business to increase productivity and cost effectiveness. It has an effect on how quickly a substance moves through a pipe, what it takes to set or dry, and also how quickly the fluid is dispensed into packaging.

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The electric motor will lift the 131 kg bundle of shingles at a height of 14 m.

Gravitational potential energy is the energy exhibited by an object because of a change in its position in the presence gravitational field.

The gravitational potential energy of an object at height h from the surface of the earth is given by:

[tex]U = mgh,[/tex]                  where m is the mass of the object.

Given, the power of the electric motor, P = 1.5 KW, and time, t - 12 s

Power = Work/ time

Work = Power × time

Work = 1500 ×12 = 18000 J

Given, the mass of the object, m= 131 Kg

The gravitational potential energy, U = 18000J

The height of the bundle of shingles can be determined as:

18000 = 131 ×9.8 ×H

H = 14 m

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Your question was incomplete most probably complete question was,

An electric motor is used to hoist building supplies from the ground to the roof of a building. How much work can the motor do in 12 seconds if its power output is 1.5 kW. How high can it lift a 131 kg bundle of shingles in that time?

The gas is a matter as it has mass and occupies space which is evident from the fact that it weighed less.

Anything that occupies space and has mass is matter.

When the gas was shot out of the can, the can weighed less. This simply means that gas has mass.

Since the gas has mass and does occupy space, so, this shows that gas is matter.

Everything around is made up of matter. There are different types of matter like solids, liquids, and gas. These three are the primary forms of matter. Two other forms are also discovered which are Plasma and Bose-Einstein Condensate.

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The electron receives some of the energy that belongs to the photon. If an object's energy declines, its frequency and wavelength get longer.

When a photon with energy hf collides with an electron that is stationary, compelling proof that light is composed of particles (photons) and that photons have momentum is produced. Although the electron receives a portion of the energy and momentum (the Compton effect), the energy and momentum are conserved in this elastic collision. The photon possesses hf/ energy following the collision, while the electron has K kinetic energy.

Energy is conserved as follows: hf = hf/ + K

Combining this with the momentum conservation formulae, the following equation may be used to demonstrate the relationship between the wavelengths of the incident and emitted photons:

Δλ = λ/ - λ = (h/mec) (1 - cosθ)

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Use Newton’s law of universal gravitation.

F = Gm1m2/r^2

(Force) F= Newtons

G is the “Universal Gravitational Constant”. G = 6.67 × 10^-11 N m^2 kg^-2

M1 is the first mass, the Sun. Mass of the Sun = 2 x 10^30 kg

M2 is the second mass, the Earth. Mass of the Earth = 6 x 10^24 kg

DR is the distance between the two objects. Distance from the Earth to the Sun = 1.5 x 10^11 metres

F = Gm1m2/r^2

F = G x 2 x 10^30 x 6 x 10^24/ [1.5 x 10^11] ^2 = 6.7 x 10^11 N

The surprising conclusion - the pendulum traverses a longer distance in a shorter time, than in a shorter distance, and its period is shorter.

The term "force" has a specific meaning in science. At this level, it is quite acceptable to refer to a force as a push or a pull. A force is not something that an object 'has in it.' Another object applies a force to another. The concept of a force is not limited to living or nonliving things.

The goal of this experiment is to quantify gravity's acceleration using a physical pendulum. A basic pendulum is described as a point mass connected to a massless unstretchable string connected to a rigid support. Mechanical energy is conserved in a simple pendulum with no friction. Total mechanical energy is the sum of kinetic and gravitational potential energy. There is a continual interchange of kinetic energy and gravitational potential energy as the pendulum swings back and forth.

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[tex]g = \frac{GM}{r {}^{2} } \\ g = \frac{6.673 \times 10 {}^{ - 11} \times 10 {}^{18} }{(10 {}^{3}) {}^{2} } \\ g = \frac{6.673 \times 10 {}^{7} }{10 {}^{6} } \\ g = 6.673 \times 10 \\ g = 66.73 \: m.s {}^{ - 2} [/tex]

The compound would  contain;

We have to know that an ionic compound has to d with a compound that is composed of ions. The ions are species that do not have the same number of positive and negative charges.

We have to note that ionic compounds must be composed of two ions that have opposite charges. In this case the iron II ion has a positive charge while the chloride ion has a negative charge.

The chloride ions are two and there is only one iron II ion present.

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Missing parts;

The name iron (II) chloride would indicate that the compound contains

a. iron ions with an 11+ charge

b. iron ions with a negative charge

c. two ions of chlorine

d. none of the above

When a car is at rest, it begins to accelerate at a pace of 8 Sec at 5 m/s It then continues moving at same speed for another lap after coming to rest in 4 seconds.

The maximum velocity attained by the car, the velocity would be 8m/s.

Initial velocity, u= 0m/s

Distance travelled in 8 sec would be

s= u ×t+ 1/2at²

= 1/2 ×5 ×(8)²

= 160m

Velocity after t= 4sec

= 2×4= 8m/s

Average velocity is defined as the change in position or displacement (x) divided by the time intervals (t) during which the change occurs. Based on the direction of the displacement, the average velocity might either be positive or negative. The unit of measure for average velocity in the SI is meters per second (m/s or ms-1).

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