The changes in the internal energy of the system -164 KJ.
Solution:
change in internal energy = q + w
= -105 KJ(+ 57 kg)
= -164 KJ.
The change in internal energy of the system is the sum of heat transferred and work done. The heat flux is equal to the change in internal energy of the system plus the PV work done. The change in internal energy of the system is the sum of heat transferred and work done.
The heat flux equals the change in internal energy of the system plus the PV work. An isolated system cannot exchange heat or interact with its surroundings, so its internal energy change is equal to zero. But in a cyclical process, the total change in the internal energy of the system is zero.
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how much does it cost to light six 100w light bulbs for six hours if the price of electrical energy is $0.09/kwh?
It will cost 0.324 Dollars to light six 100w light bulbs for six hours if the price of electrical energy is $0.09/ kwh.
kwh is commercial unit of electric energy. 1 unit= 1 kwh.
When 100 w power device is run for 1 hour, the amount of electrical energy consumed is 1 kwh.
We will find total units of electrical energy consumed in the given question.
energy consumed by 6 bulbs = 6×100= 600 w( joules per second).
The value in kwh is = 600÷1000
= 0.6kwh
Total energy consumed in 6 hours is = 0.6×6 = 3.6 kwh
So, the cost is = 3.6×0.09 = 0.324 dollars.
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racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of 26 m/s. the 189) collision takes 20 ms. what is the average acceleration of the ball during the collision?
The acceleration of the racquetball during the collision is found to be 1330m/s².
According to the second law of motion proposed by Newton the force on the body is equal to the change in momentum per unit time of the body.
So, we can write,
Ma = M∆V/t
Where,
M is the mass of the body is the,
a acceleration of the body,
∆V is the change in speed of the body after the collision,
t is the time taken during the collision.
It is given to us that the racquetball strikes the wall with a speed of 30m/s and it rebounds with the speed of 26 m/s the collision time is 20 milli seconds.
Putting the values,
a = 30-(-26)/0.02
a = 1330m/s².
So, the acceleration of the racquetball is 1330m/s².
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A 14 kg block is slid from a height of 7,6 m down a friction-less incline. It comes to a flat surface and crosses a 8.6 m strip of sandpaper with a coefficient of friction of
0.19. After passing over the sandpaper, the block is traveling on a friction-less surface again. How fast is the block traveling?
The velocity with which the block is travelling on the frictionless surface is 2.5 m/s.
What is the acceleration of the block?
The acceleration of the block is calculated by applying Newton's second law of motion as follows.
μ = F / N
where;
F is the force of frictionN is the normal force on the 14 kg blockμ is the coefficient of frictionμ = F / N
μ = ma / mg
μ = a / g
a = μg
a = 0.19 x 9.8 m/s²
a = 1.86 m/s²
The time of motion of the block is calculated as follows;
t = √ ( 2h / g )
t = √ (2 x 8.6 / 9.8)
t = 1.33 s
The velocity with which the block is travelling on the frictionless surface is calculated as;
v = u + at
where;
u is the initial velocity of the block = 0a is the acceleration of the block = 1.86 m/s²t is the time of motion of the block = 1.33 secondsv = 0 + (1.86)(1.33)
v = 2.5 m/s
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In a uniform motion
- Acceleration is non zero constant
- Direction of velocity may vary
- Speed is not constant
- Velocity and speed are constant
Answer:
pls mark as brainliest
Explanation:
Velocity and speed is constant
object's velocity will not change unless it is acted on by a(n)
O net force.
O strong force.
O unbalanced force.
O opposite but equal force
A weightlifter lifts a 20 kg barbell a distance of 0.4 m in 0.82 s. How much power is demonstrated by the lift?
95.60 watt much power is demonstrated by the lift.
What is power?Energy consumption per second is measured as power. The amount of force necessary to create a unit displacement is another way to quantify power. Power, a scalar quantity, is represented by the letter P. For instance, a light bulb with 100 W of electricity will provide more light than one with 10 W.
Given that,
weight (W) = 20 Kg
distance = 0.4 m
time (t) = 0.82 sec
As we know,
Power (P) = W/t
or, P = (20 kg × 9.8 × 0.4)/ 0.82
or, P = 95.60 watt
Thus, 95.60 watt much power is demonstrated by the lift.
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When a person holds an object, it has potential energy. How will the potential energy change if the person lifts the object above his or her heads
The potential energy won't change. if the individual raises the object above their heads.
What transpires when an object is lifted in terms of potential energy?Depending on an object's height and mass, it will have a different amount of gravitational potential energy. The amount of gravitational potential energy an object possesses increases with weight and height above the ground. The relationship between weight, height, and gravitational potential energy.
In short, potential energy is the energy that an object has stored because of its position in relation to a zero position. If an object is located at a height that is higher (or lower) than the zero height, it has gravitational potential energy.
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the movement of earthy materials from higher region to lower region due to gravitational pull is called
Landslides are caused by earthy elements moving from higher to lower areas as a result of gravity. The sliding down of a slope of a volume of rock, rubble, or earth is known as a landslide.
What creates the attraction of gravity?All things with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature.
What term best represents the pull of gravity?A mass attracts a mass; the amount of the gravitational force is direct proportion to the masses of both the two items and inverse to the square of both the distance between two pieces. Gravitational force is an electrostatic attraction and exists among the objects with mass.
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a spring with a spring constant of 125 n/m is stretched 2.0 cm from its equilibrium position. what is the change in the spring potential energy?
The change in the spring potential energy is calculated to be 0.05 Joules if the spring has a constant of 125 N/m.
The formula for the change in the spring potential energy can be given as;
String potential energy = distance of displacement × force
As the distance of displacement is 2 cm we convert it into meters as follows;
1 m = 100 cm
2 cm = 2 ÷ 100 m
2 cm = 0.02 m
The force can be determined by using the following formula;
force = spring constant × displacement
force = 125 N/m × 0.02 m
force = 2.5 N
Now substituting the values of force and displacement in the equation for potential energy as follows;
String potential energy = 0.02 × 2.5
String potential energy = 0.05 Joules
Hence 0.05 Joules is determined to be the change in the spring potential energy.
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today, astronomers find compelling evidence that the energy source of the quasars and active galaxies is:_____.
The energy source of quasars or active galaxies is currently thought to be matter falling toward a massive black hole in the center of a galaxy, according to persuasive evidence discovered by astronomers.
How does science define energy?The definition of energy is "capacity to do activity, which is ability to apply force causing motion of an object." Energy is simply the force that moves objects, despite this definition's seeming complexity. Both potential and kinetic energy fall under this category.
what is The importance of energyDue to the fact that it is a fundamental human requirement, energy is crucial to our daily existence. Our constructions, which are constructed by humans, are heated and cooled by energy. Even the simplest tasks like lifting your finger or getting out of bed require energy.
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a stream is transporting particle a. the velocity of stream is decreasing, but for the moment, particle a is still moving. however, when the water drops below 50 cm/sec, particle a falls below its fall velocity and is deposited. based on this information, what is the likely particle size for this object?
The most likely size of the particle is 10 mm
What happens as the velocity of water in a stream decreases?Point bars are formed as a result of silt deposition brought on by a decrease in water velocity inside the channel bend. Where there are low gradients and a mostly fine-grained load, meandering channels can emerge.
When a particle's velocity falls to the point that the water lacks the kinetic energy to carry it, sediment deposition occurs, causing the particle to fall out of suspension. Silt is a sediment that is bigger than clay but smaller than sand.
Given is a S curve
and in this graph we can see that when the speed of the water is 50 cm/sec in the x axis propotionatily the size of the particle is 10 mm in the y axis.
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A young girl jumps off the edge of a shopping trolley. The trolley is stationary at the moment the girl jumps. The girl jumps backwards. Describe and explain, using the idea of momentum, what happens when the girl jumps off the trolley.
Answer:
Momentum is a physical quantity equal to the product of mass of the object and its velocity. Since velocity is a vector (a quantity that has both magnitude and direction), momentum is a vector quantity as well. According to the law of conservation of momentum, the momentum is always conserved. This means that the initial momentum must be equal to the final momentum. Our initial momentum is zero since both, trolly and the girl on it are stationary. When the girl jumps, she has some velocity v. To compensate for that, the trolly will also move with some velocity v, but in the opposite direction so that the momentum stays conserved.
Explanation:
A package is dropped out of an airplane traveling at a constant velocity of 127.92 m/s and a height of 809.86 m. How far away (horizontally) does the package land from where it was dropped?
yhhhhhhhhhhhhhhhhhhhhhhhhhhhhtAnswer:c
Explanation:k
k
How does Physics connect to the Greenhouse Effect?
Answer: The greenhouse effect is caused by certain gases in the Earth's atmosphere trapping heat from the sun, which leads to climate change. Physics plays a role in understanding this phenomenon and developing solutions to mitigate its effects.
Explanation:
i-76 is backed up and you slam on breaks to keep from hitting the car in front of you. which vestibular sense organ would register your head slowing
The vestibular sense organ that would be registered is Brain.
When a driver's head is turned during an accident, the force of the impact may cause the head to twist to one side, rupturing the brain stem or injuring the spinal cord. A prolonged loss of consciousness (coma) occurs in many cases with victims. If the spinal cord is severely damaged, victims who regain consciousness risk developing permanent paralysis.Shearing injuries are also possible as a result of hard braking. This occurs as the car slows to a stop and the brain is dragged along the rough inner surface of the skull. As the brain slams against the skull, blood vessels and nerve fibers may be torn, leading to bleeding and neurological harm.To know more about blood vessels -
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mols
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Satellite
Balance
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Motion
Sound
Color
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Analyze this: A 238.6-N force is applied at an angle of 18.8° above the horizontal
to accelerate a 14.5-kg object across a level surface. The coefficient of friction is
0.247. Complete the diagram.
H=
Units
Force: N
Mass: kg
Accel'n: m/s/s
Tap on a field to enter or edit its value.
0.247
Fnorm=
=Ffrict
Fgrav =
m=
a=
142.1
14.5
Fx
Fapp=
Fy
Fx =
Fy=
238.6
Pro
Tap for Question-Sp
Help Me
Answer:
Minus the components
Explanation:
= minus components and figratives = answer 2 4
calculate the change in entropy of 3 moles of liquid water if you heat it from 5Ëšc to 95Ëšc. the molar heat capacity of liquid water is 75.38 j/molk.
Water in liquid form has an entropy change of 63.4 J/K.
define entropy ?
A state of disorder, randomness, or uncertainty is most frequently associated with the scientific concept of entropy, which is also a quantifiable physical property. From classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, to the fundamentals of information theory, the term and concept are used in a variety of disciplines. It has wide-ranging uses in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, including the transmission of information through telecommunication.
We use the equation to determine the entropy change for the same phase at various temperatures:
ΔS=n x Cp x In(T₂/T₁)
ΔS=3 x 75.38 x In (368/27)
ΔS= 63.4 J/k
therefore the entropy change of the water is 63.4J/k
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calculate the maximum speed that the car can have without losing contact with the road at the top of the hill
The maximum speed that the car can have without losing contact with the road at the top of the hill of radius 50m is 22.14 m/s.
We need to apply the concept of centripetal force, force of gravity that produces the weight and the balance of these two, in order to solve this problem.
The force of weight must be equal to the centripetal force so that the weight must be equal to centripetal force.
∑ F = 0
Fc - Fw = 0
Fc = Fw
mg = mv²/r
where, m is mass
v is velocity
r is radius
Making v as subject, we have, v = √(g * R)
v = √(g * R) = √( 9.8 * 50) = 22.14 m/s
Thus, the velocity of the car that it can have without losing contact with the road is 22.14 m/s.
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A cat is running at 4.65 m/s and has 91.7 J of kinetic energy. What is the cats mass
roller coasters are popular attractions at amusement parks. a cart on a roller coaster approaches the highest point on the coaster. as the cart reaches the top, it slows down.
As it climbs yet another hill, the roller coaster slows down. Kinetic energy is converted into potential energy.
What type of potential energy does the roller coaster have at the top of the loop?The gravitational potential energy (PE = mgh) of an object is the energy it has as a result of its height and is equal to the mass of the object times its height times the gravitational constant. The gravitational potential energy on a roller coaster is highest at the peak and lowest at the bottom. The roller coaster's potential energy is converted into kinetic energy as it travels down the hill at high speed. As it climbs yet another hill, the roller coaster slows down. Kinetic energy is converted to potential energy.
How is energy transferred on a roller coaster?Potential energy is transformed into kinetic energy, which the roller coaster uses to go forward. Once it has around the first hill, it has all the kinetic energy it needs to complete the journey. Different wheel designs make for a comfortable ride once you're moving. Running wheels on the coaster guide it along the track.
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In terms of diameter, the planet saturn is larger than _______ , but smaller than _______.
Answer:
Larger than mercury, venus, earth, mars, uranus, neptune
smaller than jupiter
what is likely to happen to the way an object moves if gravitational forces on the object do not change?
When the gravitational forces on the object does not change then object will move in predictable ways.
What happens to the object when it is moved by gravity?When objects falls to the ground, then gravity causes them to accelerate. Acceleration is the change in velocity, and velocity is a measure of the speed and direction of motion. Gravity causes object to fall towards the ground at a faster velocity.
When the Earth's gravity is lost, all items held to the Earth's surface by the gravity would float away. That includes atmosphere, water, people, cars and animals. If object were secured strongly to the Earth, then it would probably remain attached.
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The angular momentum of the propellers of a small airplane points directly forward from the plane. Part A In what direction do the propellers rotate as seen from the rear of the plane? Clockwise Counterclockwise None of the above Submit Request Answer Part B If the plane is flying horizontally and suddenly pulls upward, in which direction does the nose of the plane tend to move? The nose of the plane would veer upward. The nose of the plane would veer to the left. The nose of the plane would veer downward. The nose of the plane would veer to the right. Submit Request Answer
In clockwise direction the propellers rotate as seen from the rear of the plane. If the plane is flying horizontally and suddenly pulls upward, the nose of the plane would veer upward. The correct options are B and A respectively.
The propellers rotate anticlockwise when viewed from the back of the aircraft.
When observed from the rear, an anticlockwise rotation direction corresponds to propellers spinning in the forward direction because the angular momentum of the propellers points directly forward from the plane.
The nose of a plane tends to pull forward when a plane flying horizontally suddenly pulls upward. This is brought on by the direction of the lift force produced by the wings changing.
By raising the nose, the angle of attack widens, increasing the lift force that raises the plane's nose upward. The change in the aerodynamic forces exerted on the aircraft is what causes the nose to rise upward.
Thus, the correct options are B and A respectively.
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Your question seems incomplete, the probable complete question is:
The angular momentum of the propellers of a small airplane points directly forward from the plane. Part A In what direction do the propellers rotate as seen from the rear of the plane?
A. Clockwise
B. Counterclockwise
C. None of the above
Part B If the plane is flying horizontally and suddenly pulls upward, in which direction does the nose of the plane tend to move?
A. The nose of the plane would veer upward.
B. The nose of the plane would veer to the left.
C. The nose of the plane would veer downward.
D. The nose of the plane would veer to the right.
The diagram below shows the path of a comet around the Sun.
A
B
C
D
How does the comet's energy change as it moves from point B to point C?
(Assume that total mechanical energy is conserved.)
Since a rotating comet is an isolated system, all of its mechanical energy (motion + potential) and angular momentum are conserved (constant).
What is angular momentum?Angular momentum is the quantity rotation of a body which is the product of its moment.
The angular momentum is given by,
L = mvr
where v= velocity of comet ,
r= distance of comet from sun ,
m= mass of comet,
At position 1, r is smaller therefore v (speed) increases to keep the angular momentum constant, similarly at position r be comes large do the speed v decreases again to keep the angular momentum to the constant , therefore at position 1 speed of the and it is greater than at 2. As speed is larger at 1 , therefore kinetic energy ( K=1/2mv² ) will also be greater at the position 1 compared of position 2 .
Now mechanical energy is the same at both positions of due to energy conservation law .
As mechanical energy is equal =KE+GPE , since it is kinetic energy is greater at the position 1 therefore GPE will be greater at position 2 .
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A 2-meter-long pendulum, is set in motion, at 1.2 m/s, when the pendulum arm is at an angle of 25° from the vertical. Find the speed of the pendulum when it reaches the bottom of its swing.
two small objects each with a net charge of q exert a force of magnitude f on each other. two charges q, with equal and opposite forces f we replace one of the objects with another whose net charge is 4q: two charges, q and 4q the original magnitude of the force on the q charge was f; what is the magnitude of the force on the q charge now?
When one of the Charges Q is swapped out for another charge 4Q, there is a force on Q that is 4F strong.
Coulomb's equation of electricity states that the amount of the force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance separating the two charges.
Calculation:Mathematically, F = KQ₁Q₂ /d²
The coulombs law equation gives the magnitude of the force between the items, F, if the initial charges on the two objects are each equal to Q and the distance between the charges is d. i.e. F = KQQ/d².
The force between the charges will now be given as follows if one of the charges is swapped out for a charge 4Q:
F` = KQ₄Q / d²
F` = 4 × KQQ / d²
Comparing the force's initial and ultimate magnitude on the objectsF' = 4F.
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Question:
Two small objects each with a net charge of Q (positive) exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is 4Q. The original magnitude of the force on the Q charge was F; what is the magnitude of the force on the Q now?
A. 16F
B. 4F
C. F
D. F/4
A golf ball starts with a velocity of 10 m/s and slows at a constant rate of - 0. 5 m/s2, what is its velocity after 2 s?.
The velocity of a golf ball that starts with a velocity of 10 m/s and slows at a constant rate of -0.5 m/s^2 after 2 seconds is 9m/s.
What is velocity?It is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame or reference and as measured by a particular standard time.
How to calculate the velocity of a golf ball after 2 seconds?
From the question given :
V₁ = 10 m/s
a = -0.5 m/s^2
Δt = 2 seconds
Now let's put it into the formula
a = ΔV / Δt
- 0.5 = V₂ - V₁ / 2 seconds
- 0.5 = V₂ - 10 / 2 seconds
-1 = V₂ - 10
V₂ = 9m/s
Therefore, the velocity of a golf ball after 2 seconds which slowing down at a constant rate of -0.5 m/s^2 is 9m/s.
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If magnets are knocked around a lot or heated, their magnetism will be reduced or lost. Explain why.
Answer:
so heating a magnet disrupts the domain walls and it becomes easy for the magnet to become ordinarily misaligned and rotate. so when that happens they are now less aligned and point in the opposite direction to the neighbors causing a decrease in the magnetic field and loss of magnetism
Sara pushed a box of lab equipment along the ground, displacing it by 1 metre. By doing this, she has done __________ on the box of lab equipment.
Sara pushed a box of lab equipment along the ground, displacing it by 1 meter. she has done work on the box of lab equipment.
When a force is applied and an object is moved over a specified distance, a work has been completed. The following formula is used to calculate an object's work,
W = Fd
Where, F is the applied force, and d is the object's displacement.
When we apply force "F" to a block, the body moves with some acceleration or, additionally, its speed increases or decreases depending on the direction of the force. The system's kinetic energy changes as speed increases or decreases. Since we are aware that energy cannot be created or destroyed, it must be changed into another form. This perspective refers to it as completed work.Therefore ,Sara has therefore completed her work on the box of lab equipment when she moves it by 1 m.
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PLEASE HELP ME
A motorcycle traveling on the highway at a speed of 80.0 mi/hr passes a car traveling at a speed of 60.0 mi/hr. From the point of view (or frame of reference) of a passenger in the car, what is the velocity of the motorcycle? Write the equation in the form that I have gone over, with subscripts of: m = motorcycle rider, c = car passenger, e = earth, and assume the forward direction is positive.
The relative velocity of the motorcycle, from the point of view of the passenger in the car, is of:
20 miles per hour.
How to calculate the relative velocity?The relative velocity between two objects is divided into two cases, as follows:
Objects traveling in the same direction.Objects traveling in opposite directions.Then, for each case, the relative velocity is obtained as follows:
Same direction: The relative velocity is the subtraction of the velocities.Opposite direction: The relative velocity is the addition of the velocities.The velocities in this problem are given as follows:
Motorcycle: 80 miles per hour.Car: 60 miles per hour.The point of reference is the car, and they are travelling in the same direction, hence the relative velocity is obtained as follows:
80 - 60 = 20 miles per hour.
Which means that each hour, the motorcycle will get 20 miles farther than the car.
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