the density of mercury is 13.6g cm‐³. What do you understand by this statement?​

The force you must lift with the string to pick up the yo-yo from the floor is 49 N.

The weight of an object is defined as the force acting on the object due to gravity.

Weight is a vector quantity, because it has both magnitude and direction.

The weight of every object is the force acting downwards due to effect of gravity on the object. The force needed to pick the yo-yo from the floor must be equal or greater than the weight of the yo-yo.

F = W = mg

where;

F = 5 kg x 9.8 m/s²

F = 49 N

Thus, the force needed to pick the yo-yo must be equal or greater than its weight.

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The maximum amount of weight that can hang from the end of the rod is 8.66 N.

The maximum amount of weight that can hang from the end of the rod is calculated as follows.

Apply the formula for tension using Newton's second law of motion. Newton's second law of motion states that the force experienced by an object is directly proportional to the product of the mass and acceleration of the object.

T sinθ = W

Where;

.

10 sin(60) = W

8.66 N = W

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According to the given statement the final pressure inside the container P = 1015 atm.

Partial pressures can be calculated in one of two ways: To determine the individual pressure of each gas in a mixture, use PV = nRT. Calculate the proportion of pressure from the total pressure that may be assigned to each individual gas using the mole fraction of each gas.

You use the ideal-gas law:

PV = nRT

We are aware of V (volume), R (the ideal gas law constant, which, when applied to L and moles, is 8.314), and T. (293 K)

There are 10 g of helium, we divide by helium's molar mass in order to find the amount of moles.

10 g / (4.00 g/mol) = 2.5 moles of Helium

Since we now know all the variables, we can use the ideal-gas law to find the pressure. We'll take the equation and solve for P:

PV = nRT

P = (nRT)/(V)

P = (2.5)(8.314)(293)/(6)

P = 1015 atm

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The maximum force I can exert horizontally on the crate without moving it is 588.6 Newtons.

What is force?

A force is a push or pull that an object feels as a result of interacting with another thing. Each time two things come into contact, a force is applied to each one of them. When the interaction is finished, the force is no longer sensed by the two objects. Forces are only real when there is interaction.

The max force I can exert horizontally on the crate without moving it is equal:

[tex]F_{smax} = {\mu_s} \times M \times g[/tex]

where,

μs is the static friction, g is the gravitational force by substituted and M is the mass:

Fsmax = 0.5 * 120Kg * 9.81 m/s2

Fsmax = 588.6 N

when, F= Fsmax

Therefore,

The answer is the force F = 588.6 N

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It is to be noted that the required flight visibility and distance from clouds, if you are operating in class e airspace at 9,500 feet MSL with a VFR-on-top clearance during daylight hours, is given as "3 statute miles 1,000 above 500 Below and 2,000 horizontal"

Flight visibility is the average forward horizontal distance from the cockpit of a flying aircraft at which conspicuous unlighted objects can be seen and identified during the day and significant lighted objects can be seen and identified during the night.

Visibility requirements are the minimal visibility for flying.

According to Aviation Rules,

(a) No individual may fly an aircraft under VFR in restricted airspace when the ceiling is less than 1,000 feet unless flight vision is at least 2 miles, according to aviation rules.

(b) No person shall operate a helicopter under VFR at or below 1,200 feet above the ground or within the lateral boundaries of a designated Class B, C, D, or E airspace surface area of ​​an aerodrome unless there is clear visibility. is at least -

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The density of seawater plays a vital role in causing ocean currents and circulating heat because of the fact that dense water sinks below less dense. Salinity, temperature and depth all affect the density of seawater.

Mass per unit of volume is referred to as density. Although the Latin letter D can also be used, the sign most frequently used for density is.

Mass divided by volume is how density is mathematically defined:

[tex]{\displaystyle \rho ={\frac {m}{V}}}[/tex]

the volume is V, the mass is m.

The fact that water loses density as temperature drops from 4° C to the point at which it freezes makes it one of the peculiar characteristics of water. This enables a variety of aquatic life forms to endure the winter. If ice were more dense than water, it would continue to freeze and sink until the lake was completely frozen.

The density of seawater plays a vital role in causing ocean currents and circulating heat because of the fact that dense water sinks below less dense. Salinity, temperature and depth all affect the density of seawater.

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Answer:

It will be 1/9 of its previous value

Explanation:

Weight = mass x gravity

Gravity = GM / r²     (G is the constant)

Since the new radius is three times r, we plug in 3r:

New gravity = [tex]\frac{GM}{(3r)^{2} }[/tex]

Since the new gravity is 1/9th of the original gravity, the new weight is 1/9th the original weight.

Answer:

magnitude of the force acting on the object

F = ma. The higher the Force, higher the acceleration

Explanation:

Acceleration is directly proportional to the magnitude of the force

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The frequency of the sound heard by the driver of the Porsche is 689.39 Hz and 614.8 Hz.

In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time.

(a) as when a person is in front of the car:

f' = (350 - 0/350 - 20) x f = 350/330 x 650 = 689.39 Hz

(b) when a person is behind the car (source is moving away):

f'' = (350 - 0/350 + 20) x f° = 350/370 x 650 = 614.8 Hz

V(source) = 72 km/h = 20 m/s

V(sound) = 350 m/s

f° = 650 Hz

Hence, the frequency of the sound heard by the driver of the Porsche is 689.39 Hz and 614.8 Hz.

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From the question, we can see that the momentum is a vector thus the change in the momentum with respect to the ground observer ought to be zero.

The term momentum has to do with the  product of the mass and the velocity of a body. Let us recall that the momentum of a body is a vector quantity thus we have to consider the magnitude as well as the direction of the vector.

With this said, we are going to consider the question more critically. We are told that; a  ball travels along a straight path, perpendicular to a wall. The ball bounces off the wall and returns with the same magnitude of momentum, p, with respect to a ground observer at rest.

Looking at the fact that the momentum of the body is a vector and we have seen told that the ball bounces off the wall and returns with the same magnitude of momentum the  it follows that the change in the momentum is zero.

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Missing parts;

A ball travels along a straight path, perpendicular to a wall. The ball bounces off the wall and returns with the same magnitude of momentum, p, with respect to a ground observer at rest. What expression shows the change in momentum as observed by the ground observer?

a. 0

b 0.5p

c 2p

d 1.5p

Answer:

Proteins are organic compounds containing nitrogen that are made of long, linked chains of amino acids and are a part of all living organisms.

The characteristics of sound waves include wavelength, amplitude, frequency, and velocity which can cause of bridge collapse.

When the prevalence of a wave matches the Natural frequency of the bridge the swing of the bridge can be made up in amplitude up to the point of causing its destruction. This phenomenon is called Resonance. No matter whether you are talking about vibrations or waves, all of them can be characterized by the following four characteristics: amplitude, wavelength, frequency, and speed. The most similar causes of bridge failure are the lack of structure and design, corrosion, construction, and supervision error, accidental overload, impact, scour, and lack of maintenance or inspection.

so we can conclude that Wave characteristics include frequency, period, wavelength, and amplitude that can collapse a bridge.

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Gravity causes an object to fall toward the ground more quickly the longer it is in free fall. In reality, an object's velocity increases by 9.8 m/s, and by the time it starts to fall, it has already reached 9.8 m/s.

All matter is impacted by a force called gravity in the universe. Any two non-zero mass objects or particles will gravitationally gravitate toward one another. Gravity has an impact on objects of all sizes, from subatomic particles to galaxy clusters.

Speed after 2 seconds = 40m/s

Since falling causes velocity to increase by 9.8m/s,

Speed 5 seconds after the jump = 40 + (3 * 9.8)

                                                      = 69.4 m/s

When an object is moving, its velocity serves as a measure of how quickly its location is changing as it is perceived from a given point of view and as time is measured using a specific unit of measurement.

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Factors that are needed to determine the amount of heat absorbed by an aluminum cube are the initial and final temperatures of aluminum cube.

Heat absorbed by aluminum is the amount of heat taken during the heating process.

To calculate the heat absorbed durring heating process, we use the formula:

Q = mc(T1 - T2)

Where:

T1 = initial temperature

T2 =  final temperature .

c = specific heat capacity of the aluminum.

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Answer:

The correct options are A, B, C, and E!

Explanation:

I just got it right on edge.

Hope this helps - brainliest would be appreciated!

Have a great day everyone!

Answer:

t= 10 seconds

Explanation:

Using the equation of motion with constant acceleration v=u+at

where t is time

a is acceleration of gravity

u is initial speed and f is final speed.

take the downward direction as negative

[tex]u = 0 \\ v = - 100 \frac{m}{s} \\ a = - 10 \frac{m}{{s}^{2} } [/tex]

then

[tex] - 100 = 0 - 10t \\ - 100 = - 10t \\ t = 10s[/tex]

The resultant vector of 1. 130N and 2.  155 N respectively.

A resultant vector is described as a single vector that produces the identical effect as is produced through a number of vectors collectively.

1. 100 N, 37° east of north + 100 N 60°North -west

Let Force₁ = 100 N sin37°

                  = 100 N × 4/5

                  = 80 N North

      Force₂ = 100 N cos 60°

                  = 100 N × 1/2

                  = 50 N

Now, the angle between F₁ and F₂ is 0

Resultant force = [tex]\sqrt {F₁^{2} +\sqrt F₂^{2} + 2abcos°}[/tex]

                         = [tex]\sqrt{(80)^{2} +(50)^{2}+2*80*50}[/tex]

                        = [tex]\sqrt{6400+2500+8000}[/tex]

                        = [tex]\sqrt{16900}[/tex]

                         = 130N

2.  100N, 37° west of north + 50N,53° east of north

   Force₁ = 100N, 37° west of north

                =100N cos 37°

               = 100N × 5/4

               = 125 N north

  Force₂ =  50N,53° east of north

               = 50N cos 53°

                = 50N × 3/5

                = 30N

The angle between F₁ and F₂ is 0°

Resultant force = [tex]\sqrt {F₁^{2} +\sqrt F₂^{2} + 2abcos°}[/tex]

                           = [tex]\sqrt{(125)^{2} +(30)^{2}+2*125*30}[/tex]

                         = [tex]\sqrt{15625+900+7500}[/tex]

                        = [tex]\sqrt{24025}[/tex]

                         = 155 N

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Correct option is C. To get a resultant vector, Add two or more vectors.

As a combination of direction and magnitude, vectors are written with an alphabet and an arrow over them (or) with an alphabet written in bold.

The two vectors a and b can be combined using vector addition, and the resulting vector is denoted by the notation a + b. Before learning about the characteristics of vector addition, it is important to comprehend the conditions that must be met.

These are the prerequisites:

Vectors can only be inserted if they are the same kind.

For instance, while adding acceleration, mass should not be considered.

The addition of scalars and vectors is not possible.

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Potential energy plus kinetic energy are combined to form mechanical energy. According to the principle of mechanical energy conservation, mechanical energy is constant in an isolated system when only conservative forces are acting on it.

E mechanical = U + K

E mechanical = mechanical energy

U = potential energy

K = kinetic energy

Mechanical energy, also known as kinetic energy or potential energy, is the energy that an object possesses when it is in motion or the energy that an object stores due to its location.

Renewable energy is also fueled by mechanical energy. In order to efficiently produce electricity or convert energy, many sources of renewable energy depend on mechanical energy.

Applying,

Mechanical Energy (M.E.) = ((1/2)mv²) + (m × g × h)

                                          = ((1/2)*100*45²)+(100*9.8*12)

                                          = 101250+ 11760

                                          = 113010 J

m is the object's mass, v is its speed, g is its gravitational acceleration, and h is its height above the ground.

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The gravitational force between Earth and the moon  would decrease if them distance between them increased.

The gravitational force is focused at the system's barycenter rather than at the centers of either object when two objects are gravitationally linked together. It has a similar concept to a see-saw.

We are aware that the gravitational force's equation is F=GMm/r2.

Where M is the force of one object, m is the force of another object, r is the distance between them, and G is the gravitational constant.

As we can see, since F is inversely correlated to r, the gravitational force will grow as their separation widens.

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We can see that the images show that the waves are moving towards each other hence they interfere constructively as shown in the first image or option A.

The term  wave has to do with a disturbance along a medium which transfers energy. We know that the wave could be transverse or longitudinal. A longitudinal wave is one in which the direction of the propagation is the same as that of the disturbance that is producing the wave.

The image that have been shown is that of the interference of waves. Recall that waves could interfere constructively  or destructively. The waves that interfere constructively tend to increase the magnitude of the disturbance while the waves that interfere destructively tends to cancel out each other.

Here, it is obvious that the interference of the waves is quite a constructive one as the disturbance increases clearly from the images shown.

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When an item sinks under force, its volume can be calculated. For this reason, the item is fastened to another readily sinkable object. Since the floating object will sink in the water, its volume may be determined.

One method to determine the volume of a floating object is to weigh it down using a heavy object. It's crucial to figure out the water's depth both with the heavy object submerged and with it pulling the floating object down into the water.

An object floats when the water's upward push balances the weight force acting on it. Untainted by water depth, the amount of the object immersed increases the water is probably upward push.

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The electron current driven through a 2.4 mm diameter iron wire by a 0.070 v/m electric field is 24.34 * [tex]10^{18}[/tex] electrons / s

I = n A e [tex]v_{d}[/tex]

[tex]v_{d}[/tex] = т e E / m

I = Current

n = Free electron density

A = Area

e = Charge

[tex]v_{d}[/tex] = Drift velocity

т = Mean time

E = Electric field

m = Mass of charge

т = 5.2 * [tex]10^{-15}[/tex] s

d = 2.4 mm

r = 1.2 mm = 1.2 * [tex]10^{-3}[/tex] m

E = 0.07 V / m = 0.07 N / C

e = 1.6 * [tex]10^{-19}[/tex] C

m = 9.1 * [tex]10^{-31}[/tex] kg

A = π r²

A = 3.14 * ( 1.2 * [tex]10^{-3}[/tex] )²

A = 4.52 * [tex]10^{-6}[/tex] m²

[tex]v_{d}[/tex] = ( 5.2 * [tex]10^{-15}[/tex] * 1.6 * [tex]10^{-19}[/tex] * 0.07 ) / ( 9.1 * [tex]10^{-31}[/tex] )

[tex]v_{d}[/tex] = ( 0.58 * [tex]10^{-34}[/tex] ) / ( 9.1 * [tex]10^{-31}[/tex] )

[tex]v_{d}[/tex] = 63.7 * [tex]10^{-6}[/tex] m / s

n = ( Avogadro's number * Density ) / Atomic mass

Avogadro's number = 6.023 * [tex]10^{23}[/tex] atoms / mole

Density of copper = 8.92 * 10³ kg / m³

Atomic mass = 63.5 * [tex]10^{-3}[/tex] kg / mole

n = 8.46 * [tex]10^{28}[/tex] / m³

I = n A e [tex]v_{d}[/tex]

I = 8.46 * [tex]10^{28}[/tex] * 4.52 * [tex]10^{-6}[/tex] * 1.6 * [tex]10^{-19}[/tex] * 63.7 * [tex]10^{-6}[/tex]

I = 3897.34 * [tex]10^{-3}[/tex]

I = 3.9 A

I = 3.9 * 6.242 * [tex]10^{18}[/tex] electrons / s

I = 24.34 * [tex]10^{18}[/tex] electrons / s

Therefore, the electron current driven through the iron wire is 24.34 * [tex]10^{18}[/tex] electrons / s

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In designing a rocket to select an engine based on how much force it produces, the engine need to produce 144 N force.

Force applied on launching model rockets is calculated by the formula,

F = m*a

where,

F is the force of engine

m is the mass

a is the acceleration

The given data are :

m = 5 Kg

a = 28.8 m/s²

F = ?

Now, putting the values in the formula we get,

F = 5 Kg x 28.8 m/s²

F = 144 N

So,  In designing a rocket to select an engine based on how much force it produces, the engine need to produce 144 N force.

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The acceleration of the ball just before it reaches its highest point is 9.8m/s2.

At the highest point the velocity turns out to become zero.

Then acceleration = acceleration due to gravity = 9.8 m/s2

The meter per second square (m/s2) is unit of acceleration.

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From the description, the  type of telescope was she most likely using is the radio telescope.

The telescope is the kind of device that could be used to find the and see the objects that are in the outer space. There are several kinds of telescopes such as;

The radio telescope is the kind of telescope that is able to convert the radio signals into a format that could be used study the parameters that concern the universe. The clarity of the telescope is most times dependent on the location of the person using the telescope.

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Missing parts;

Sarah just bought a telescope and is telling you all about what she saw last night, but she keeps mentioning that every object she pointed it towards seemed to have a fuzzy

glow. What type of telescope was she MOST likely using?

A. radio telescope

B. refracting telescope

C. compound telescope

D. reflecting telescope

Answer:

She is most likely using a refracting telescope.

Explanation:

These telescopes are easily accessible to the general public and are popular for new astronomers but may produce a fuzzy glow around objects they magnify.

The tension in the string gets doubled when we double the mass of the cart as well as of the mass that hangs from the string.

We know, Newton's Second law states that the force applied to a body is directly proportional to the mass and the acceleration of the body, i.e.,

F = ma

where F is the force applied to the body or the tension in the cart, m is the mass of the body and a is the acceleration of the body.

Since, the mass of the cart is doubled, the tension on the string becomes:

[tex]F_{2}[/tex] = (2m)a

[tex]F_{2}[/tex] = 2ma

[tex]F_{2}[/tex] = 2F

Therefore, the tension in the string also gets doubled.

Complete Question: students work together during an experiment about newton’s laws. the students use a setup that consists of a cart of known mass connected to one end of a string that is looped over a pulley of negligible friction, with its other end connected to a hanging mass. the cart is initially at rest on a horizontal surface and rolls without slipping when released. the inertia of the cart's wheels is negligible. students have access to common laboratory equipment to make measurements of components of the system. The students double the mass that hangs from the string. They also replace the original cart with a new cart that has double the mass. By doubling both masses, how will the tension in the string and the acceleration of the cart change?

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The heat generated due to the friction in the given process is 367.83 J.

Frictional heat generates when two surfaces slide against each other. The heat generated due to the friction in the given process is 6.92.7 J.

Frictional heat:

This heat is generated when two surfaces slide against each other.

Potential energy :-

U= m g h;

Put the values

U=  18.0-kg* 9.8 m/s^2 *2.20 m

U=388.08 J

The Kinetic energy in the bottom:

K = 1/2 * m * v^2

=  1/2 * 18.0* 1.50^2

K= 20.25 J

So the friction heat,

Hf = U - K

Hf = 388.08 J -20.25 J

Therefore, the heat generated due to the friction in the given process is 367.83 J.

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The angle of banking does not affect  the maximum speed at which a car can safely negotiate a frictionless banked curve.

We know that when a car is trying to negotiate a curve, the car is undergoing a circular motion at the bend. The car is tending to move around the bend and then emerge at the other side. Sometimes the bend is made a bit or somewhat steeper at a give angle and this can help the cars to negotiate the ben successfully without skidding off the road.

We know that we can obtain the maximum velocity of the motion of the car as it negotiates the bend using thee formula;

v = √mgr/h

v = velocity

m = mass

g = acceleration due to gravity

r = radius

h = height

It the follows that the maximum speed at which a car can safely negotiate a frictionless banked curve depends on all of the following except  the angle of banking.

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Missing parts;

Complete the following statement: The maximum speed at which a car can safely negotiate a frictionless banked curve depends on all of the following except

A. the diameter of the curve.

B. the acceleration due to gravity.

C. the angle of banking.

D. the mass of the car.

E. the radius of the curve.

V = k q / d

V = Electric potential difference

k = Coulomb's constant

q = Electric charge

d = Distance from the point charge

Since it is spherical in shape, according to Gauss law, the dust grain can be treated as a point charge.

[tex]q_{net}[/tex] = - n e

[tex]q_{net}[/tex] = Net charge

n = No. of excess electrons

e = Charge of an electron

V = - 0.15 V

d = 3 * [tex]10^{-7}[/tex] m

k = 9 * [tex]10^{9}[/tex] N

e = 1.6 * [tex]10^{-19}[/tex] C

[tex]q_{net}[/tex] = - n ( 1.6 * [tex]10^{-19}[/tex] )

V = k [tex]q_{net}[/tex] / d

- 0.15 = - n ( 9 * [tex]10^{9}[/tex] ) ( 1.6 * [tex]10^{-19}[/tex] ) / 3 * [tex]10^{-7}[/tex]

n = 31 electrons

E = k q / r²

E = Electric field strength

E = - k n e / r²

E = - ( 9 * [tex]10^{9}[/tex] ) ( 31 ) ( 1.6 * [tex]10^{-19}[/tex] ) / ( 3 * [tex]10^{-7}[/tex] )²

E = 5 * [tex]10^{5}[/tex] V / m

Therefore,

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