8) a 20kg box is sliding across the ground. If the coefficient of friction is 0.5, how much friction will the box experience?

A 490 N
B 19.6 N
C 98 N
D 2 N

Answer:

d=75 m

Explanation:

Before Skidding

[tex]v^2-v_o^2=2ad[/tex]

[tex]0^2-49^2=2a(12)[/tex]

After Skidding

[tex]v^2-v_o^2=2ad[/tex]

[tex]0^2-122.5^2=2ad[/tex]

[tex]\frac{49^2}{122.5^2}=\frac{12}{d}[/tex]

[tex]d=75 m[/tex]

Hope it helps

Answer:

The minimum gauge pressure you must produce in your lung is -3.356 x 10⁻³ atm

Explanation:

Given;

density of the lemonade, ρ = 1000 kg/m³

maximum height of the lemonade, h₂ = 3.47 cm = 0.0347 m

The minimum gauge pressure you must produce in your lung is given by  Bernoulli’s equation;

P₂ + ρgh₂ = P₁ + ρgh₁

P₂ = P₁ + ρgh₁ - ρgh₂

P₂ = P₁ + ρg(h₁ - h₂)

P₂ = P₁ + ρg(0 - h₂)

P₂ = P₁ - ρgh₂

P₂ = 0 -  ρgh₂

P₂ = -  ρgh₂

P₁ = -(1000)(9.8)(0.0347)

P = -340.06 N/m²

The gauge pressure (in atmospheres) is given as;

P = -340.06 / 101325

P = -0.003356 atm

P = -3.356 x 10⁻³ atm

Therefore, the minimum gauge pressure you must produce in your lung is -3.356 x 10⁻³ atm

Answer:

Following are the solution to this question:

Explanation:

In the given question, the substantial growth throughout stocks and also in agricultural productivity, combined with a growing public understanding of both the important importance of seafood as a food item in a healthy, diversified diet, has led to the upward rise in fish consumption in the last fifty years.

Answer:

A force of 1000 N was applied on the motorcycle.

Explanation:

Given data,

[tex]m = 500 Kg\\a = 2m/s^{2} \\putting in the formula\\F = m.a\\[/tex]

F = 500x 2

F = 1000N

Hence the force applied is 1000 N

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Answer:

A. It interrupts the low of electrons when it is open.

Explanation:

The switch in an electrical circuit interrupts the flow of electrons when it is open. Therefore, option (A) is correct.

The electric circuits can be described as closed-loop or paths, forming a network of electrical components where electrons flow. The path is generally made using electrical wires. The start-off point from where the electrons start flowing is known as the source, whereas the point where electrons leave the electrical circuit is known as the return.

The switch can be described as a small gap in the circuit. There are many types of switches. A switch is used to open or close an electrical circuit. A switch can be described as an electrical component that can be used to turn on and turn off any equipment.

When the switch of an electrical circuit is off, the circuit is open, and there is no flow of current or electrons. The current flow when the circuit is closed, therefore the switch should be on.

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Answer:

A physical change is the change of the shape or color.

Explanation:

Answer: Fire

Explanation: There are lots of different types of chemical changes but fire is the best example and almost always used in text books and tests. Fire, or "combustion" completely changes the fuel. It is a chemical reaction that produces heat and light energy in exchange for fuel and O2.

Answer:

orange and red

Explanation: hope this helps lemme know if its correct

Answer:

1.736m/s²

Explanation:

According to Newton's second law;

[tex]\sum F_x = ma_x\\[/tex]

[tex]Fm - Ff = ma_x\\[/tex] where;

Fm is the moving force = 70.0N

Ff is the frictional force acting on the body

[tex]Ff = \mu R\\Ff = \mu mg\\[/tex]

[tex]\mu[/tex] is the coefficient of friction

m is the mass of the object

g is the acceleration due to gravity

a is the acceleration/deceleration

The equation becomes;

[tex]Fm - Ff = ma_x\\Fm - \mu mg = ma\\[/tex]

Substitute the given parameters

[tex]Fm - \mu mg = ma\\70 - 0.18(20)(9.8) = 20a\\70-35.28 = 20a\\34.72 = 20a\\a = \frac{34.72}{20}\\a = 1.736m/s^2\\[/tex]

Hence the deceleration rate of the wagon as it is caught is 1.736m/s²

Answer:

positive- downward

negative- upward

Explanation:

A vector is a quantity described by a magnitude and a direction.

The algebraic sign, positive (+) and negative (-) are used to designate the distance and velocity vectors for an object in free fall where positive represents downward  and negative represents an upward movement of the object.

Hence, the correct answer is "positive- downward  and negative- upward".

Answer:

The distance is [tex]r = 55430496 \ m[/tex]  

Explanation:

From the question we are told that

   The period of the moon [tex]T = 1.2 days = 1.2 * 24 * 3600 = 103680 \ s[/tex]

    The mass of the planet is  [tex]m_p = 9.38*10^{24} kg[/tex]

Generally the period of the moon is mathematically represented as

       [tex]T = 2 * \pi * \sqrt{ \frac{r^3 }{ G * m_p } }[/tex]

Here G is the gravitational constant with value

        [tex]G = 6.67 *10^{-11} \ N \cdot m^2/kg^2[/tex]

=>   [tex]T = 2 * \pi * \sqrt{ \frac{r^3 }{ G * m_p } }[/tex]

=>   [tex]103680 = 2 * 3.142 * \sqrt{ \frac{r^3 }{ 6.67*10^{-11} * 9.38*10^{24} } }[/tex]

=>    [tex]272218492.31 = \frac{r^3}{ 6.67 *10^{-11} * 9.38*10^{24}}[/tex]

=>    [tex]r = \sqrt[3]{ 1.7031241*10^{23}}[/tex]j

=>   [tex]r = 55430496 \ m[/tex]        

Answer:

BOTH the size of the force AND the mass of the object

Explanation:

Acceleration of an object is the rate of change of its velocity.

The relation between force, mass and acceleration is given by the formula as follows :

F = ma

m is mass

a is acceleration

It would mean that the change in motion or the acceleration of an object depends on both the size of the force and the mass of the object. Hence, the correct option is (c).

Answer:

6.94446 min

Explanation:

t=s/v

Answer:

c

Explanation:

Maximum potential energy is at point R is best supported by the diagram. Therefore, the correct option is option C among all the given options.

In physics, motion is a function of a body's position or orientation over time. Translation is defined as movement across a line or even a curve. Rotation is a motion that modifies a body's orientation. In all scenarios, the acceleration and directed speed of every point on the body are equal (time rate of change of velocity).

Every movement has a frame of reference to which it is related. A body isn't in motion when it is said to be at rest; rather, it is being characterized in relation to a reference frame that's also moving with the body. Maximum potential energy is at point R is best supported by the diagram.

Therefore, the correct option is option C.

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Answer:

Continuous

Explanation:

A circuit can only light up a lightbulb if there is a continuous path for electricity to travel from one end of the energy source to the other end.

Answer:

continuios

Explanation:

Answer:

effects of gravity on the Moon and Earth

Explanation:       Newton found the Moon's inward acceleration in its orbit to be 0.0027 metre per second per second, the same as (1/60)2 of the acceleration of a falling object at the surface of Earth.

Answer:

Explanation:

I think is B

Answer:

the answer is 4

Explanation:

just answer the question

Answer:

O A. Freudian concepts

Freud (1905) stated that events in our childhood have a great influence on our adult lives, shaping our personality. He thought that parenting is of primary importance to a child's development, and the family as the most important feature of nurture was a common theme throughout twentieth-century psychology (which was dominated by environmentalists theories).

Explanation:

Hope this helped!

O A. Freudian concepts. Freud (1905) stated that events in our childhood have a great influence on our adult lives, shaping our personality.

He thought that parenting is of primary importance to a child's development, and the family as the most important feature of nurture was a common theme throughout twentieth-century psychology (which was dominated by environmentalists theories).

One of the case studies most closely linked with the Austrian psychotherapist Sigmund Freud is the hysterics and treatment of Anna O.

Despite the fact that Freud is intimately identified with Anna O, it is thought that he never actually treated her; instead, Breuer saw the patient.

Therefore, O A. Freudian concepts. Freud (1905) stated that events in our childhood have a great influence on our adult lives, shaping our personality.

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Answer:

C) The force experienced by the ball equals the force experienced by the club.

Explanation:

When the golfer strikes the ball with his club, the club exerts a force on the ball. Due to Newton's Third Law Of Motion [Every Action has an equal and opposite reaction], the ball also exerts an equal force on the club. However,

As the mass of the club is usually greater than the mass of the ball, it accelerates slower; While the ball way faster, following the equation : F=ma

Answer:

Vector

Explanation:

Vector is a quantity that shows the direction or path through which a body travels with as it changes position.

As body travels, the direction sometimes changes and this is described by the vector of the body.

Velocity is a vector quantity that describes the displacement per unit of time of a body.

Speed is a scalar that deals with the distance covered per time

So, a vector specifies the magnitude of a physical quantity and also the direction through which it travels.

Answer:

a

Explanation:

As the scientific questions guide the design of investigation, They must be supported by They can be supported by evidence.

The correct option is A.

Scientific investigation is the process of looking for answers by doing extensive research and finding the answers through experimental results.

The scientific investigation very much relies on true experimental results that can be supported by evidence.

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Answer:

23.51 m/s

Explanation:

Parameters given:

Kinetic energy, K = 295 J

Momentum, p = 25.1 kgm/s

a) The kinetic energy of a body is given as:

where m = mass of the body and v = speed of the body

Answer:

Explanation:

Where,

[tex]\to\:\:\sf\red{K.E. = \dfrac{1}{2}mv^{2}}[/tex]

[tex]\to\:\:\sf\orange{5000 = \dfrac{1}{2} \times 100 \times v^{2}}[/tex]

[tex]\to\:\:\sf\green{5000 = 50 \times v^{2}}[/tex]

[tex]\to\:\:\sf\blue{\dfrac{5000}{50} = v^{2}}[/tex]

[tex]\to\:\:\sf\purple{100 = v^{2}}[/tex]

[tex]\to\:\:\sf\red{\sqrt{100} = v}[/tex]

[tex]\to\:\:\sf\orange{ 10 = v}[/tex]

[tex]\to\:\:\bf\pink{v = 10\:m/s}[/tex]

Answer:

Organic systems used 45% less energy overall than conventional systems. Production efficiency was 28% higher in the organic systems, with the conventional no-till system being the least efficient in terms of energy usage.

Answer: 65%

Explanation: i took the quiz

Answer:

Your power output as you climb the stairs is 300.92 Watts.

Explanation:

Power is the amount of work per unit of time that some object or system produces. Power is calculated by:

[tex]P=\frac{W}{t}[/tex]

Power is measured in watts (W), equivalent to one joule (J) of work done per second (s).

Work is defined in physics as the force that is applied to a body to move it from one point to another. The work is calculated as the multiplication of the force by the distance:

Work = F*d

Newton's second law says that the acceleration of a body is proportional to the resultant of forces on the acting and inversely proportional to its mass. This is expressed by the equation:

F=m*a

In this case,  

considering that the force of gravity acting on you, the force is:

F=m*a= 72.5 kg * 9.8 [tex]\frac{m}{s^{2} }[/tex] =710.5 N

The distance is the multiplication between the number of stairs and the height of the stairs in meters (18 cm= 0.18 m, being 100 cm= 1 m):

d = 40 * 0.18 m= 7.2 m

Then:

Work= 710.5 N* 7.2 m

Work= 5,115.6 J

So finally the power can be calculated as:

[tex]P=\frac{5,115.6 J}{17s}[/tex]

P= 300.92 Watts

Your power output as you climb the stairs is 300.92 Watts.

Answer:

The answer is "Option 5".

Explanation:

Jadeen claims that only by hitting the wire to make it thinner and wider, it can improve a copper wire's strength, which is why a copper wire's permeability doesn't quite improve and can reduce once it is pounded. Arnell says so by heating its wire, it can improve its strength, and when it is heated, the wire's permeability reduces.

Answer:

68.6 m/s

Explanation:

Recall that the velocity formula to use for accelerated motion due to gravity (g) is:

vf =vi + g * t

so if 19.6 m/s is the initial velocity for the free falling object, then, 5 seconds later under the acceleration of gravity (g) :

vf = 19.6 + 9.8 * (5) = 68.6 m/s

Explanation:

solar energy is the answer

Answer:

400km/50h = 90m/s..

Explanation:

..

Given the distance covered and time elapsed, the speed of the object represented by the graph is 8km/hr.

Speed is simply referred to as distance traveled per unit time.

Mathematically, Speed = Distance ÷ time.

Given the data in the question;

Speed = Distance ÷ time

Speed = 400km ÷ 50hrs

Speed = 8km/hr

Given the distance covered and time elapsed, the speed of the object represented by the graph is 8km/hr

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Answer:

13.7%

Explanation:

Given that,

Heat absorbed by the engine = 97.2 kJ

Heat exhausted by the engine in each cycle = 83.8 kJ

We need to find the efficiency of the engine. It is calculated by the formula.

[tex]\eta=1-\dfrac{Q_e}{Q_a}\\\\=1-\dfrac{83.8}{97.2}\\\\=0.137\\\\=13.7\%[/tex]

so, the efficiency of heat engine is 13.7%.