A certain brand of freezer is advertised to use 880 kW*h of energy per year, thus values are:
(A) P = 401.82 W
(B) K = 10.26
(C) m = 35.52 kg
What is maximum performance coefficient?Both a thermal Carnot efficiency and a Carnot coefficient of performance exist. The temperatures of the system's hot and cold reservoirs affect its maximum coefficient of performance.
(A)
Use the relation between power and energy to calculate the require power to operate engine.
The required power for the freezer to operate is:
P = E/t
E = Energy and t = time
The freezer operates for 6 h each day, and then in 1 year, the freezer operates for a time period is:
t = (365 days) × (6 h /1 day)
or, t = 2190 h
Thus, P = E/t
or, P = (880 Kw.h/ 1 year) × (10³ W / 1 KW) × (1 year/2190 h)
or, P = 401.82 W
Therefore, the required power is: 401.82 W
(B)
The theoretical maximum performance co-efficient is:
K = T(C) / [T(H) - T(C)]
or, K = (-6°C +273)/[(20°C + 273) - (-6°C +273)]
or, K = 267 K / 293 K - 267 K
or, K = 10.26
Therefore, the theoretical maximum performance co-efficient is: 0.26
(C)
The heat needed to make 1 kg ice is:
Q = m×[c(water)]×ΔT +mL
Here, specific heat of water [c(water)], heat of fusion of water L.
Q = m×[c(water)]×ΔT +mL
or, Q = (1 kg) × (4190 J/kg.K) × (293K - 273K) + (1 kg) × (334 × 10³ J/Kg)
or, Q = 417800 J
The heat of removal is,
Q(removal) = WK
or, Q(removal) = PtK
or, Q(removal) = (401.82 W) × (3600 sec) × (10.26)
or, Q(removal) = 14841623.52 K
Mass of the ice is,
m = Q(H) /Q
or, m = 14841623.52 Ws / 417800 J
or, m = 35.52 kg
Therefore, the mass of the ice is: 35.52 kg
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mechanical energy is select one because the roller coaster select one energy due to friction and air resistance as it travels down the track.State True or False your answer:
a. True
b. False
True, Mechanical energy is chosen because the roller coaster chooses one energy owing to friction and air resistance as it travels down the track.
what is friction ?
When we throw a ball on the ground, it starts moving with a certain speed. But ideally there would be no force acting in the direction of motion and according to Newton's first law the ball would keep rolling, but this doesn't happen. Instead, the ball stops after traveling a certain distance, so a force must be applied to it. We call this force "friction".
Friction provides the traction needed to walk without slipping. Friction is useful in most cases. However, they also offer a major countermeasure to movement. In addition, about 20% of car engine power is consumed to overcome friction in moving parts. In the next section, we take a look at some of these factors.
True Mechanical energy is chosen because the roller coaster chooses one energy owing to friction and air resistance as it travels down the track.
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Hold your arm outstretched so that it is horizontal. Estimate the mass of your arm and the position of its center of gravity.
What is the gravitational torque on your arm in this position, computed around the shoulder joint?
The gravitational torque on your arm in this position around the shoulder joint is mgL/2.
What is torque?The force that can cause an object to rotate along an axis is measured as torque. An object acquires angular acceleration due to torque.
A vector quantity is a torque. The force acting on the axis determines the direction of the torque vector.
Let the mass of your arm = m.
Length of your arm = L.
If the hand has uniform mass, the position of its center of gravity during it is horizontal is = L/2.
Hence, the torque on your arm in this position around the shoulder joint be =
weight of your hand × the position of its center of gravity with respect to shoulder
= mgL/2
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why does neptune appear blue and jupiter red? why does neptune appear blue and jupiter red? neptune is hotter, which gives bluer thermal emission. methane in neptune's atmosphere absorbs red light. neptune's air molecules scatter blue light, much as earth's atmosphere does.
Methane in Neptune's atmosphere absorbs red light.
Why does Jupiter appear reddish brown while Neptune appears blue?Methane, which makes up 2% or less of Neptune's atmosphere, is what gives the planet its blue tint.
Neptune: Is it a gas or a water?Like Uranus, Neptune is an icy giant.It resembles a gas giant.It is composed of a solid core the size of Earth flowing over a soup or stew of water, ammonia, & methane.A dense, windy atmosphere surrounds Neptune.
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a uniform ladder rests against a smooth vertical wall. there is no friction between the ladder and the wall. the coefficient of static friction between the ladder and the ground is 0.506. what is the minimum angle such that the ladder does not slip?
The minimum angle that the ladder make with the floor before it slips with the force is 45 Degree.
Given data:
The coefficient of static friction force between ladder and floor is, \mu =0.5.
Apply the Newton' law in vertical direction to obtain the value of Normal Force (P) as,
N = mg
And force along the horizontal direction is,
F= μ*N
F = μ*mg
Now, taking the torque along the either end of ladder as,
-mgcosθ * L/2 = (μmg)*sinθ*L
cosθ*1/2 = μsinθ
tanθ = 1/(2*0.5)
tanθ = 1/1 = 1
tanθ = tan 45
θ = 45
Thus, we can conclude that the minimum angle that the ladder make with the floor before it slips with the force is 45 Degree.
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Identify the primary functions of areolar connective tissue. Select all that apply.
O Connects muscle to bone
O Protects the epidermis
O Supports epithelium
O Resists compression
O Connects different tissue types
Submit Request Answer
The primary functions of areolar connective tissue is to support epithelium and connect different tissue types.
Areolar connected tissue is the most abundant tissue in the human body.
It's primary function is to support the epithelium and connects the different type of tissues. This is why it is called a type of connective tissue.
Connective tissue is a tissue that connects to other type of tissues. Areolar connected tissue contains collagen elastic and reticulum fibres which are randomly distributed in all the direction which helps to provide a support for the epithelium and connect the tissues together.
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an inductor with an inductance of 15.0 mh carries an electric current of 29.0 a. how much energy is stored in the inductor (or it's magnetic field, if you like) in joules? round your answer to the nearest tenth of a joule.
Answer:
29.0 it's magnetic
Explanation:
a neutral atom that consists of positive and negative charge is placed at location . this neutral atom has a known polarization . what is the separation length of the induced dipole? define the net electric field at a as 'e'. please answer as a formula; you may use the terms 'k', 'alpha', 'q', 'd', 'e', and 's'.
The separation length of induced dipole is [tex]E_{net}[/tex] =[tex]\frac{kq}{d^{2} }[/tex] ( 1 + [tex]\frac{s}{8d}[/tex] ) leftward.
What is dipole moment?
A charge separation results in dipole moments. Dipole moments are caused by changes in electronegativity and can appear in ionic bonds between two ions or covalent bonds between atoms. The dipole moment increases with increasing electronegativity disparity. Another element affecting the size of the dipole moment is the distance between the charge separations. A molecule's polarity can be determined by its dipole moment.
We have,
Electric field due to dipole = E₂
As negative charge is nearer then the electric field will be toward the dipole.
E₁ = [tex]\frac{kqs}{r^{3} }[/tex] = [tex]\frac{kqs}{(2d)^{3} }[/tex] = [tex]\frac{kqs}{8d^{3} }[/tex]
Now, electric field due to single charge -q = E₂
E₂ = [tex]\frac{kq}{r^{2} }[/tex] = [tex]\frac{kq}{d^{2} }[/tex]
[tex]E_{net}[/tex] = E₁ + E₂ = [tex]\frac{kq}{d^{2} }[/tex] ( 1 + [tex]\frac{s}{8d}[/tex])
So, [tex]E_{net}[/tex] = [tex]\frac{kq}{d^{2} }[/tex] (1 + [tex]\frac{s}{8d}[/tex] ) leftward.
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Part A: Identify the following parts of each chemical formula by circling the subscripts and drawing a square around the coefficients. Write the total number of atoms in each compound on the _______.
H2 3 HCl 4 O2 CH4 2Ba(SO4)2 3Al2(SO4)3
A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
How do you calculate chemical formulas?Partition the exact equation mass from the compound's molar mass. The result should be a full number or very near one. Utilizing the whole number found in sync 2, duplicate every addendum in the exact recipe by that number. The atomic equation is the result.A substance equation is an expression that rundowns the constituent pieces of a compound along with their relative amounts. No addendum is utilized in the event that there is only one particle of a particular kind. An addendum is added to the image for a molecule in the event that it contains at least two of a specific sort of iota.A substance equation records the constituent parts of a compound along with the quantity of iotas in every component's littlest unit, like a particle or recipe unit.Given a substance recipe, we can name basic mixtures by utilizing the names of the components and a couple of straightforward principles.Total no of atoms
H2 = 2
HCL = 7
O2 = 2
CH4 = 4
Ba(SO4 = 8
Al2(SO4) = 12
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a resistance that varies as the patient moves the joint through a range of motion while the speed of motion does not change is calssified as
A resistance that varies as the patient moves the joint through a range of motion while the speed of motion does not change is classified as isokinetic exercise.
Isokinetic exercise is a type of exercise training that uses a special machine. The exercise machine generates different levels of resistance. your movements are at a constant speed, irrespective of the amount of force you apply. The machine can always match the amount of force you apply.
Walking on a treadmill is an example of an isokinetic exercise. Cycling on an exercise bike is another example. During walking at a constant speed, muscles contract at the same speed throughout the range of motion.
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2. best electric whishes to construct a new coal-fired plant in the southwest corner of michigan. best plans to use the best available technology for the scrubbers on the plant to reduce emissions. should best be able to obtain a permit from the epa to build and operate the proposed new electric plant? please briefly discuss the issues best faces for the proposed plant.
Best electric will be able to obtain a permit from the epa to build and operate the proposed new electric plant but on certain conditions.
Electricity is a powerful thing. In order to use its benefits, it is necessary that the amount of electricity in the grid corresponds with actual consumption needs. Due to the ever-increasing demand and growth in popularity of such advances as electric vehicles, there are several challenges power grid operators need to face.
Growing amount of renewable energy sources Electricity transmission losses Frequent power outages Electromobility Grid modernization Threat of cyber attacks Threat of terrorist attacksThe power sector is facing new and increasing challenges, like many other sectors, but it is also finding more innovative ways to overcome these hurdles. Overall, shoring up operations through digitization can help plant managers not only increase flexibility, but also win talent, prevent future threats, and—hopefully—rest easy at night.
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stimulus producing a response that reduces its effects is producing à response that amp fies its effects is responds in a way that influences the original is received by control center effector sends a signal along the efferent pathway to the sends a signal along the afferent pathway to the sensory receptor negative feedback positive feedback is a mechanism that when used appropriately returns the body to is a mechanism that, when used appropriately retuns the body to homeostasis specifically moves the variable away (at least temporarily) from specifically moves the variable toward oniginal set point or range
A decline in function as a result of stimulation is known as negative feedback. When there is negative feedback, the output of a certain system or reaction is reduced.
The homeostatic process is known as a negative feedback mechanism when the response causes the initial stimulus to decrease. Positive feedback mechanisms are those where the response improves upon the initial stimulus. Feedback loops react to environmental changes or stimuli to keep systems operating close to their set point or ideal level. When an input or stimulus is affected or influenced by an output or response from a loop, this is known as feedback.
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what are the two principles of the first law of motion
Answer: The principles are
An object at rest (not moving) will stay at rest unless an unbalanced force acts on it.An object in motion will stay in motion (in a straight line and at a constant speed) unless an unbalanced force acts on it.Explanation: Hope this was helpful
A 6,100 kg freight truck accelerates from 12 m/s to 37 m/s in 6.4 s by applying a constant force. How much force was applied to the truck?
The force applied to 6,100 kg freight truck which accelerated from 12 m/s to 37 m/s in 6.4 s is 23828.13 N.
How much force was applied to the truck?From Newton's Second Law, force is expressed as;
F = m × a
Where is mass of object and a is the acceleration.
From the First Equation of Motion;
v = u + at
Where v is final velocity, u is initial velocity, a is acceleration and t is time elapsed.
Given the data in the question;
Mass of the truck m = 6100 kgInitial velocity u = 12m/sFinal velocity v = 37m/s Elapsed time t = 6.4sAcceleration a = ?Force applied F = ?First, we determine the acceleration of the truck, using the first equation of motion.
v = u + at
37m/s = 12m/s + ( a × 6.4s )
Solve for a
37m/s - 12m/s = ( a × 6.4s )
25m/s = a × 6.4s
a = 25m/s / 6.4s
a = 3.90625 m/s²
Now, we determine force applied.
F = m × a
F = 6100kg × 3.90625 m/s²
F = 23828.13 kgm/s²
F = 23828.13 N
Therefore, the force applied is approximately is 23828.13 Newtons.
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which of the following statements is false? group of answer choices hubble space telescope images are black and white when they are obtained. red glass allows only the red light to pass through. filters are used by the hubble space telescope to record light at certain wavelengths, block out light outside of a certain range. the hubble space telescope can detect ultraviolet light. green glass allows all colors of light but the green light to get through.
The false statement is that green glass allows all colors of light but the green light to get through. Hence, option D is correct.
What is Wavelength?The distance between two identical locations (adjacent crests) in successive cycles is known as the wavelength, and it is used to describe waveform signals that are transmitted over wires or into space. Typically, in wireless systems, this length is specified in meters (m), centimeters (cm), or millimeters (mm).
The Hubble Space Telescope is designed to discriminate between the visible, infrared, and brilliant electromagnetic spectrums. The photographs indicate that the telescope captured only black and white images. This telescope primaries the Red, Green, and Blue filters, which are divided into three channels. The majority of these filters allow the distinct wavelengths, which are not identical to them, and mirror the red, green, and blue spectrum. Yes, ultraviolet light can be detected by Hubble Space Tempe. Only red light can travel through the red glass.
Only green light will be able to pass through the green glass. For instance, the green light will only pass through green glass and won't pass through red glass.
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A hockey puck with a mass of 0.16 kg travels at a velocity of 40m / s toward a goalkeeper. The goalkeeper has a mass of 120 kg and is at rest. Assuming a closed system, find the total momentum of the goalkeeper and puck after the puck is caught by the goalkeeper. In 3-4 sentences, identify the object with the greater momentum after the puck is caught and explain your reasoning. (4 points)
(a) The total momentum of the goalkeeper and puck after the puck is caught by the goalkeeper is 6.4 kgm/s.
(b) The goalkeeper has greater momentum after the puck is caught because of the conservation of linear momentum. The initial momentum of the hockey puck of 6.4 kgm/s was transferred to the goalkeeper which increased his initial zero momentum to approximately final momentum of 6.4 kgm/s.
What is the total moment of the goalkeeper and puck?
The total momentum of the goalkeeper and puck after the puck is caught by the goalkeeper is calculated by applying the principle of conservation of linear momentum.
m₁u₁ + m₂u₂ = v (m₁ + m₂)
where;
m₁ is the mass of the hockey puckm₂ is the mass of the goalkeeperu₁ is the initial velocity pucku₂ is the initial velocity of the goalkeeperv is the final velocity of the goalkeeper and puck after the collision0.16(40) + 120(0) = v (0.16 + 120)
6.4 = 120.16v
v = (6.4) / (120.16)
v = 0.053 m/s
The final momentum of the hocky puck after the collision is calculated as;
Pf₁ = 0.16 kg x 0.053 m/s
Pf₁ = 0.0085 kgm/s
The final momentum of the goalkeeper after the collision is calculated as;
Pf₂ = 120 kg x 0.053 m/s
Pf₂ = 6.36 kgm/s
The total momentum = 0.0085 kgm/s + 6.36 kgm/s = 6.4 kgm/s
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You pick up a 2.6 kg can of paint from the ground and lift it to a height of 1.7 m .
A: How much work do you do on the can of paint? Express your answer using two significant figures.
B: You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time? Express your answer using two significant figures.
C: Your friend decides against the paint, so you lower it back to the ground. How much work do you do on the can as you lower it? Express your answer using two significant figures.
Work done in each case is 43.36 N ,-43.36 N , 41.97 N/m
What is work done ?The definition of the work performed by a force is the sum of the products of the magnitude of this force acting in the displacement's direction displacement. W = F x d.
(a) W = F × d
F = ma = 2.6×9.81
W = 2.6×9.81×1.7 = 43.36 J
Work done is 43.36 N
(b) Zero
because distance is zero in this case
W = -43.36 J
Work done is -43.36 N
(c) KE = 0.5×m×[tex]v^{2}[/tex] = 0.5×1770× [tex]120^{2}[/tex] = 1.274×[tex]10^{7}[/tex] J
0.5×m×[tex]v^{2}[/tex] = 0.5 ×k× [tex]x^{2}[/tex]
k = 1.6×[tex]2.1^{2}[/tex]/[tex]0.41^{2}[/tex] = 41.97 N/m
Work done is 41.97 N/m
Work done in each case is 43.36 N ,-43.36 N , 41.97 N/m
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what is the amplitude of oscillation a of the scale after the slices of ham land on the plate? express your answer numerically in meters and take free-fall acceleration to be g
The amplitude of oscillation of the scale is 0.0581 m after the slices of ham land on the plate.
We need to calculate the amplitude of oscillation a of the scale after the slices of ham land on the plate
What is the amplitude of Simple harmonic motion?
It is the maximum displacement of an object from its mean position. It can be calculated by the formula,
v = w√(A² - x²)
Where,
v - velocity
w - angular velocity
A - amplitude of the oscilation
x - displacement
Put the values in the formula,
0.95 = 6.9√(A² - 0.0147²)
A = 0.0581
Therefore, the amplitude of oscillation of the scale is 0.0581 m after the slices of ham land on the plate.
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A particle moving on the x-axis experiences a force given by Fx=qx2, where q is a constant. How much work is done on the particle as it moves from x=0 to x=d? Express your answer in terms of some or all of the variables q and d.
The work done on the particle as it moves from x=0 to x=d is qd^3/3 when a particle moving on the x-axis experiences a force given by Fx=qx2, where q is a constant.
Given force is Fx =qx^2
As particle moves from x = 0 to x = d the work done on the particle by using force Fx is as follows
By integration W = ∫Fxdx
W = ∫qx^2dx
W = (qx^3/3) from 0 to d
W = q/3(d^3 - 0)
W = qd^3/3
hence the work done by particle as it moves from x= 0 to x = 3 is qd^3/3
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Which is least affected by chemical weathering?(1 point)
a statue made of marble
a pile of tiles made of feldspar
a bridge made of iron rods
a chair made of plastic
The option that is least affected by chemical weathering is: A pile of tiles made of feldspar.
What is Chemical weathering?The term "weathering" refers to the process by which rocks are disintegrated into smaller fragments by a variety of actions and mechanisms. Contrarily, chemical weathering refers to the degradation of rocks by chemical interactions between the constituents.
Clay minerals, such as quartz and feldspar, are least impacted by chemical weathering due to the lack of chemical interactions, making them the best choice in this circumstance.
In conclusion, the correct option is: a pile of tiles made of feldspar.
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a force of 3300 newtons can crack a human rib. how realistic is it for the astronaut to lift 500 kg mass by supporting it on his back and lifting with his legs? will he break a rib?
If the astronaut price to lift a mass of 500 kg by supporting it on his back and lifting with his leg he will not break a rib because he is in spaces.
It is provided to us that a force of 3300 Newtons can crack a human rib.
If an astronaut is lifting a mass of 500 kg by supporting it on his back and lifting with his legs.
He will not break a rib if he is in the space.
The reason for this is because in the space there is no gravitational acceleration.
Because of the absence of gravitational acceleration there will be no force generated on the 500 kg mass and their will be no relative force between the astronaut and the mass.
Both the astronaut and the 500 kg mass will feel a weightlessness condition in this space.
That is why we are concluding that he will not break a rib.
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dentist's chair with a person in it weighs 1925 n. the output plunger of a hydraulic system starts to lift the chair when the dental assistant's foot exerts a force of 35 n on the input piston. neglecting any difference in the heights of the piston and the plunger, what is the ratio of the area of the plunger to the area of the piston?
The area of the plunger to the area of the piston will have a ratio of 0.0189.
Who defines pressure?Pressure is the amount of force that is applied perpendicularly to an object's surface divided by the area that the force is spread across. In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a particular location within a confined fluid P represents it
The output pressure remains constant.Po=Pi
Fo/Ao=Fi/Ai
Ao/A=35/1925
Ao/Ai=.0189
Consequently, 0.2323 will be the ratio of the plunger's surface area to the piston's surface area.
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One of the largest planes ever to fly, and the largest to fly frequently, is the Ukrainian-built Antonov An-124 Rusian. Its wingspan is 73.2 m and its length is 69.2 m. The gravitational potential energy associated with the plane at an altitude of 1.45 km is J. What is the airplane's mass? Please show work!
Answer:
Gravitational potential energy is energy an object possesses because of its position in a gravitational field.
It is given by P.E = mgh
where m = mass
Explanation:
g= acceleration due to gravity
h = height of the object
Here,
h = 1.45km = 1450 m
P.E = 3.36 x J
g = 9.8m/
therefore, m = P.E/ gh = (3.36 x s J)/ 9.8 x 1450
m = 2.36 x
Hence mass of the airplane is 2.36 x
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g 1.) a circular loop carrying a current of 0.5 a is placed in a 2 t magnetic field. if the magnetic moment of the loop is 0.75 am2, what is the area of the coil in m2? a.) 3.0, b.) 1.5, c.) 0.75, d.) 0.38, e.) 0.19
A circular loop carrying a current is placed in a given magnetic field and if the magnetic moment of the loop is 0.75 am2, then the area of the coil is calculated as b) 1.5 m².
What is magnetic moment?In electromagnetism, magnetic moment is the magnetic strength and orientation of a magnet that produces a magnetic field. Examples of objects that have magnetic moments are loops of electric current, permanent magnets, elementary particles and others.
As we know that, M = NIA
Where; M -- magnetic moment, I -- current and A -- area.
Given M= 0.75, I= 0.5
A= M/NI
= 0.75/0.5
Area of the coil=1.5 m².
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a force of 6 ib is required to hold a 23 ib crate on a hill. what angle does the hill make with the horizontal
The hill makes a 23° angle with the horizontal with the given force.
briefly:-To hold a 23-pound crate on a hill, 6 pounds of force must be used.
Let's say the hill is at an angle to the ground.
There will be two weight components, one running parallel to the hill and the other perpendicular.
The only part that pushes the crate rearward is the one along the hill.
So,
23sin θ= 9
sin θ= 9/23
θ= 23°
How do land surveyors calculate slope?The gradient is determined similarly to how slope can be measured as a percentage. Divide the increase by the run after changing the rise and run's units to match.
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at what speed would a 900 kg compact car need to move to have the same kinetic energy?
66.67 m/s speed would a 900 kg compact car need to move to have the same kinetic energy.
What is kinetic energy?
The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the stated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes.
Given
mass of meteor [tex]$m=2.5 \mathrm{gm} \approx 2.5 \times 10^{-3} \mathrm{~kg}$[/tex]
velocity of meteor [tex]$v=40 \mathrm{~km} / \mathrm{s} \approx 40000 \mathrm{~m} / \mathrm{s}$[/tex]
Kinetic Energy of Meteor
[tex]$K . E .=\frac{m v^2}{2}$[/tex]
[tex]$K . E .=\frac{2.5 \times 10^{-3} \times(4000)^2}{2}$[/tex]
K.E.[tex]$=2 \times 10^6 J$[/tex]
Kinetic Energy of Car
[tex]$$\begin{aligned}& =\frac{1}{2} \times M u^2 \\& =\frac{1}{2} \times 900 \times u^2 \\& \frac{1}{2} \times 900 \times u^2=2 \times 10^6 \\& 900 \times u^2=4 \times 10^6 \\& u^2=\frac{4}{9} \times 10^4 \\& u=\frac{2}{3} \times 10^2 \\& u=66.67 \mathrm{~m} / \mathrm{s}\end{aligned}$$[/tex]
Complete question: A typical meteor that hits the earth’s upper atmosphere has a mass of only 2.5 g, about the same as a penny, but it is moving at an impressive 40 km/s. As the meteor slows, the resulting thermal energy makes a glowing streak across the sky, a shooting star. The small mass packs a surprising punch. At what speed would a 900 kg compact car need to move to have the same kinetic energy
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a boat (with a flat bottom) and its cargo weigh 5,800 n. the area of the boat's bottom is 9 m2. how far below the surface of the water is the boat's bottom when it is floating in water?
The required height above which boat's bottom floats is 6cm.
The upward force exerted by the liquid opposes the weight of the object immersed in the liquid. The pressure at the bottom of an object immersed in liquid is always greater than at the top. A fluid pressure differential produces a net upward force on an object. This upward force is called lift. To fully understand the concept of buoyancy, we need to understand density and relativity.Buoyancy depends on two important factors.Liquid density.Body volume.Example - A ship is designed to be lifted very high, but has a flat, hollow bottom and is relatively less dense than water. Therefore, the ship displaces as much water as it needs, so it can easily float.
Well buoyancy = weight of displaced water = 5800 N
1 m3 of water has a mass of 1000 kg so weight 1000 x 9.81 = 9810 N
therefore volume of water displaced = 5800 / 9810 m3
44 Required depth = volume/floor area = volume/9 (5800/(9810×9))m=0.06m=6cm
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a rectangular block of ice with dimensions 2 m by 2 m by 0.2 m floats on water. a person weighing 950 n wants to stand on the ice. would the ice sink below the surface of the water?
The Ice block will not sink below the surface of water when the person stand on the block.
In order to be able to float on the surface of the water, the weight of the person has to be equal to the buoyancy on the ice block.
The buoyancy that the water will apply on the surface of water will be given by,
B = Vpg
Where
B s buoyancy,
V is the volume of the Ice block, this will be calculated by using the dimension of the ice block,
p is the density of water which is 1000 kg/m³,
g is the gravitational acceleration.
Putting values,
B = (2 x 2 x 0.2) x 1000 x 9.8
B = 7840N.
As we can see, the buoyancy on the block is more than that of the weight of the person which is 950N, so, we can say, The ice will not sink below the surface of water.
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Raghi, Sruthi and Neethu have to dissolve maximum amount of sugar in the same amount
of milk so as to win in a game. Neethu took hot boiling milk while Sruthi took ice cold milk.
Raghi managed to get milk at room temperature.Whom do you think would win the game and
why?
( 5 mark )
Neethu will win the game. This is because heat from the hot boiling milk will dissolve the sugar particles faster.
Particle theory
This states that when a solid is heated, the particles acquire sufficient energy to break away from one another and move past each other. The change from solid to liquid is called melting or fusion.
Also, liquid milk helps in the fast dissolution of the sugar( solid particles). This will also make Neethu win the contest.
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Which of the following conditions should be met to make a process perfectly reversible? Check all that apply. Any mechanical interactions taking place in the process should be frictionless. 0 0 0 Any thermal interactions taking place in the process should occur across infinitesimal temperature or pressure gradients. The system should not be close to equilibrium.
Option A and B; Any mechanical interactions taking place in the process should be frictionless. Any thermal interactions that take place throughout the process ought to cross negligible gradients in either pressure or temperature.
For the process to be perfectly reversible, there should be no non-conservative forces acting as it will lead to energy dissipation. Secondly, the process should occur in very small steps so that it may be reversed at any point in the process. If a thermodynamic system can exchange energy with another system through the process of heat, the two systems are said to be in thermal interactions. Since real systems are almost never completely thermally isolated from their surroundings, perfect thermal isolation is an ideal.
It is impossible for heat to pass between two solid bodies when they are in contact. Thermal contact conductance is a term used to investigate heat transfer between such bodies. The study of how heat and other types of energy interact is the subject of the physics discipline known as thermodynamics.
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determine the direction of the force on the charge due to the magnetic field. (figure 1)
The direction of the force on the charge due to the magnetic field is 0(if angle is 180°) and qVB (angle is 90°)
Magnitude force on moving charge particles is F = qvBsinθ
Direction of particle is given by right hand thumb rule,
Right hand point in direction of v, the finger in direction of B.
Force is directly perpendicular to the right hand palm.
Angle. between. V and B. is 180. degrees
F = qVB sin 180° = 0
Angle between V and B is 90 degrees
F = qVB sin90° = qVB
A magnetic field is a vector field that explains the magnetic influence on electrically charged objects in motion, electric currents, magnetic materials,[1]: [2]. A force perpendicular to the magnetic field and its own velocity acts on a moving charge in a magnetic field. [1]: ch13 [3]: 278 The magnetic field of a permanent magnet attracts or repels other magnets and pulls on ferromagnetic materials like iron. In addition, three more magnetic effects—paramagnetism, diamagnetism, and antiferromagnetism—exert minute forces on "nonmagnetic" materials in a nonuniform magnetic field, however these forces are often so minute that can only be measured by laboratory apparatus
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