37500 Newton meter is the pressure
how long will it take to heat 5 kg of water from 28 degrees Celsius to 88 degrees Celsius in an electric kettle taking 6 amperes from a 220 volt supply . Specific Heat capacity of water is 400 joules per kilogram kelvin. I need this ASAP! .I'll mark brainliest
Answer:
1.5 minutes
Explanation:
To find out how long it will take to heat 5 kg of water from 28 degrees Celsius to 88 degrees Celsius in an electric kettle, we can use the equation:
Q = mcΔT
Where Q is the heat energy added, m is the mass of the water, c is the specific heat capacity of water and ΔT is the change in temperature.
The heat energy added to the water can be calculated as:
Q = (5 kg) x (400 J/kg·K) x (88°C - 28°C) = (5 kg) x (400 J/kg·K) x (60°C) = 120000 J
The power of the electric kettle can be calculated using the formula:
P=VI
where P is the power, V is the voltage and I is the current,
P = (220 V) x (6 A)
= 1320 W
Now we can calculate the time it takes to heat the water by dividing the heat energy added by the power:
time = Q/P = 120000 J / 1320 W
= 90.909 seconds or 1.5 minutes
It will take 1.5 minutes to heat 5 kg of water from 28 degrees Celsius to 88 degrees Celsius in an electric kettle taking 6 amperes from a 220 volt supply.
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A figure skater begins spinning counterclockwise at an angular speed of 3.4 π rad/s. During a 4.5 s interval, she slowly pulls her arms
inward and finally spins at 8.1 π rad/s.
What is her average angular acceleration
during this time interval?
Answer in units of rad/s^2
As per the problem statement the average angular acceleration is 4.7/4.5 = 1.78 rad/s2
The rate at which the angular velocity of an item changes over time is known as its angular acceleration. It is a vector quantity that describes the rate of change in angular velocity, which is the rotational equivalent of linear acceleration. It is the angular equivalent of linear acceleration, which is the rate of change of linear velocity over time. Angular acceleration is typically expressed in units of radians per second squared (rad/s2). It is also referred to as angular je rk, angular deceleration, or angular frequency.
The average angular acceleration is 1.78 rad/s2.
This is calculated by taking the change in angular speed (8.1 - 3.4 = 4.7) and dividing it by the time interval (4.5 s).
Thus, the average angular acceleration is 4.7 / 4.5 = 1.78 rad/s 2.
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Objects with masses of 141 kg and 494 kg are separated by 0.396 m. A 74.8 kg mass is placed midway between them.
1 ) Find the magnitude of the net gravitational force exerted by the two larger masses on the 74.8 kg mass.
The value of the universal gravitational constant is 6.672 × 10−11 N · m^2 /kg^2.
Answer in units of N.
2 ) Leaving the distance between the 141 kg and the 494 kg masses fixed, at what distance from the 494 kg mass (other than infinitely remote ones) does the 74.8 kg mass experience a net force of zero?
Answer in units of m.
( 1) The net gravitational force between the 74.8 kg mass is 8.09 x 10⁻⁵ N.
( 2) The distance from the from the 494 kg mass where the middle mass experiences net zero force is 0.258 m.
What is net gravitational force on 74.8 kg mass?
The net gravitational force between the 74.8 kg mass is calculated by applying Newton's law of universal gravitation as shown below.
F = ( GmM ) / ( R² )
where;
G is universal gravitation constantm is the mass of the middle massM is the mass of the first massR is the distance of separation between the two massesThe force between the first mass and the middle mass is calculated as;
F' = ( 6.672 x 10⁻¹¹ x 141 x 74.8 ) / ( 0.198² )
F' = 1.8 x 10⁻⁵ N
The force between the third mass and the middle mass is calculated as;
F'' = ( 6.672 x 10⁻¹¹ x 494 x 74.8 ) / ( 0.198² )
F'' = 6.29 x 10⁻⁵ N
The net gravitational force on the middle mass;
F (net) = 6.29 x 10⁻⁵ N + 1.8 x 10⁻⁵ N
F ( net ) = 8.09 x 10⁻⁵ N
Let the distance of zero net force = d
F' = ( 6.672 x 10⁻¹¹ x 141 x 74.8 ) / ( d² )
F' = 0.704 x 10⁻⁶ / d²
F'' = ( 6.672 x 10⁻¹¹ x 494 x 74.8 ) / ( 0.396 - d )²
F'' = 2.47 x 10⁻⁶ / ( 0.396 - d )²
for zero net force, the two forces must be equal
0.704 x 10⁻⁶ / d² = 2.47 x 10⁻⁶ / ( 0.396 - d )²
0.704 (0.396 - d )² = 2.47d²
(0.396 - d )² = ( 2.47d² ) / ( 0.704 )
(0.396 - d )² = 3.51d²
0.396 - d = √ ( 3.51d² )
0.396 - d = 1.87d
1.87d + d = 0.396
d (1.87 + 1) = 0.396
d (2.87) = 0.396
d = 0.396 / 2.87
d = 0.138 m
The distance from the 494 kg mass = 0.396 - 0.138 m = 0.258 m
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If you wanted to determine how mass affects acceleration, lost the independent and dependent variables and the constant.
This is the equations for a hyperbola if we plot mass as both the independent variable & acceleration as such dependent variable, again understanding Newton's second law.
What was the experiment's independent variable?The measured reaction is the dependent variable. The dependent variable is dependent on the variation in the independent variable, to put it another way.
What distinguishes dependent from independent behavior?In a scientific experiment, variables are the two most crucial variables. The independent variable is the one that is under the experimenter's control. The variable that adapts to the explanatory variables is known as the dependent variable.
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A swimming fish has a momentum of 8 kg-m/s. It eats a stationary 2 kg fish and keeps
swimming. What is their new momentum?
a. Zero
b. 10 kg-m/s
c. 8 kg-m/s
d. 16 kg-m/s
Answer:
d. 16 kg-m/s
Explanation:
The new momentum of the swimming fish after eating the stationary fish can be calculated by adding the momentum of the initial swimming fish and the momentum of the stationary fish. Since momentum is a vector quantity, the direction of the momentum is the same as the direction of motion of the fish. If the fish continues to swim with the same velocity after eating the stationary fish, then the new momentum is the sum of the initial momentum of the swimming fish and the momentum of the stationary fish.
Initial momentum of swimming fish = 8 kg-m/s
Momentum of stationary fish = 2 kg * 0 m/s = 0 kg-m/s
New momentum = Initial momentum of swimming fish + Momentum of stationary fish = 8 kg-m/s + 0 kg-m/s = 8 kg-m/s + 2 kg-m/s = 10 kg-m/s.
So, the correct answer is (d) 16 kg-m/s.
Answer:
C
Explanation:
Using law of conservation of momentum of the system
Momentum before = momentum after
8 kg m/s = 8 kg m/s
The second fish has zero momentum, so after eating it the system still has momentum of 8 kg m/s
what is the gravitational force between the earth and the moon
Answer:
1.98×1020 N 1.98 × 10 20 N
Explanation:
The gravitational force between the Earth and the Moon is 1.98×1020 N 1.98 × 10 20 N.
Four research assistants were asked to observe a gamer and count the number of times the gamer exhibited aggressive behaviors during a one hour gaming session. The first research assistant counted five aggressive behaviors, the second recorded eight, the third observed only two, and the fourth observed ten. If we assume that the research assistants are equally accurate in what they observed, what is the mostly explanation for these discrepancies?
There could be several explanations for the discrepancies in the number of aggressive behaviors observed by the research assistants, but the most likely explanation is that the observations were subjective and prone to bias.
1. Observer bias: The research assistants may have different definitions of what constitutes aggressive behavior, or they may have different levels of sensitivity to detecting aggressive behaviors. This can lead to different interpretations of the same behavior and result in different counts.
2. Different focus: The research assistants may have focused on different aspects of the gaming session and paid attention to different details, resulting in different counts.
3. Fatigue: The research assistants may have become less attentive or less accurate in their counting as the gaming session progressed, which could explain why some of the counts are higher than others.
4. Confirmation bias: Research assistants may have been more likely to notice behaviors that confirm their preconceptions about the gamer, leading to counts that are higher or lower than what was actually observed.
5. Different cultural background: Research assistants from different cultural background may have different understanding of what is aggressive behavior.
If wind blows 40m/s over house, what will be net force on the roof it has surface area 250cm²? (density of air = I, 29kg/m²)
According to the question: the net force on the roof is 8.45 kN.
What is net force?The vector sum of the forces operating on a particle of object is known as the net force in mechanics. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force. In accordance with Newton's second rule of motion, it causes the particle to accelerate at a rate equal to the sum of all those actual forces.
The net force on the roof is equal to the air pressure multiplied by the surface area of the roof. The air pressure is equal to the density of the air multiplied by the wind speed squared. Therefore, the net force on the roof can be calculated as follows:
Force = (density x wind speed²) x surface area
Force = (1.29 kg/m² x (40 m/s)²) x (250 cm²)
Force = 8.45 kN
Therefore, the net force on the roof is 8.45 kN.
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How can i balance this Erick
Answer:
Option a. The baton's center of mass is closer to the larger sphere, making the lever arm distance between your hand and the center of mass longer in option a than in option b. The longer lever arm distance gives you finer control.
3. Desert Climate a. What are the characteristics of a desert climate? b. How do plants adapt to live in that type of climate? c. What type of special features do they have that help them survive?
The features of a Desert Climate sare mainly associated with the absence of precipitation and high solar radiation (question a), plants adapt to live in that type of climate due to the close of stomata and avoiding the presence of many leaves that lose too much water and or succulence in the plant shoot (questions b and c).
What is the relationship between desert conditions and plant adaptations in terms of evolution?The relationship between desert conditions and plant adaptations in terms of evolution is based on certain anatomical and or physiological features used by these organisms to avoid the excessive loss of water under extreme desertic conditions such as the presence of small leaves and close stomata.
Therefore, with this data, we can see that plant adaptations in terms of evolution in desert environments are mainly associated with small leaves and also close stomata for gas exchange.
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Frici the cat has excellent hearing. He hears the tapping of his favorite treat from afar
in his plate in front of the door.
His owner dropped the treat into his plate from a height of 125 cm, the door is 30 meters from the garden gate, Frici
and he was wandering at the edge of the forest 300 meters from the garden entrance. Its reaction time is 0.1 seconds and 6.6
is speeding home at a speed of m/s.
How long after dropping the reward snack does Frici arrive if the speed of sound is 330 m/s?
Help:
Sub-question 1: How long will the reward wall fall if the difficulty acceleration is set to 10 m/s²
shall we round?
Sub-question 2: How long does it take for the voice to reach Frici?
Sub-question 3: How long does it take Frici The cat to reach her plate?
The time spent after dropping the reward snack is
0.5 seconds1 second4.55 secondsWhat are Frici's resolves?Generally, To determine how long it takes Frici to arrive at his plate after the treat is dropped, we need to calculate the time it takes for the sound of the treat hitting the plate to reach Frici, and then add the time it takes for Frici to run back home.
Sub-question 1: The time it takes for the treat to fall from a height of 125 cm can be calculated using the formula:
t = √(2h/g)
where
h is the height (125 cm) and g is the acceleration due to gravity (10 m/s²). The height must be converted to meters first. So,t = √(2*1.25/10)
= 0.5 seconds
Sub-question 2: The time it takes for the sound to reach Frici can be calculated using the formula:
t = d/s where d is the distance
30 meters + 300 meters = 330 meters
and s is the speed of sound (330 m/s).
So, t = 330/330
= 1 second
Sub-question 3: Frici's reaction time is 0.1 seconds and he runs at a speed of 6.6 m/s, so the time it takes for him to reach his plate can be calculated using the formula:
t = d/s
where
d is the distance (30 meters) and s is his running speed (6.6 m/s).
So,
t = 30/6.6
= 4.55 seconds
Therefore, the total time it takes for Frici to arrive at his plate is: 0.11 seconds (time for treat to fall) + 1 second (time for sound to reach Frici) + 4.55 seconds (time for Frici to run back) = 5.66 seconds
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A =1.25
kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a W=18.3
N horizontal force. Find the magnitude of the tension in the rope and the rope's angle from the vertical. The acceleration due to gravity is =9.81
m/s2.
The magnitude of the tension in the rope is 12.2625 N, and the rope is being pulled horizontally to the left by the wind force..
What is tension?
Tension is the force transmitted through a string, rope, cable or wire when it is pulled tight by forces acting on it from opposite ends. It is a force that is directed along the length of the string, rope, cable or wire and is always directed away from the object that is creating the tension.
When an object is suspended from a rope or cable, the tension in the rope or cable must be equal to the weight of the object in order for the object to remain stationary or move at a constant velocity. If the tension is less than the weight of the object, the object will fall, and if the tension is greater than the weight of the object, the object will rise.
Tension plays an important role in many areas of physics and engineering, such as in the design of suspension bridges, elevator systems, and the motion of satellites in orbit.
To find the tension in the rope and the rope's angle from the vertical, we can start by drawing a free body diagram of the object:
Tension (upwards)
|
|
|
|
Weight (downwards)
|
|
|
|
Wind force (to the right)
where Tension is the tension in the rope, Weight is the weight of the object, and Wind force is the horizontal force due to the wind.
The object is in equilibrium, so the net force on it is zero. We can write two equations based on the forces in the vertical and horizontal directions:
Vertical equilibrium:
Tension - Weight = 0
Tension = Weight
Horizontal equilibrium:
Wind force = Tension * sin(theta)
where theta is the angle between the rope and the vertical.
We can solve these equations for the tension and theta:
Weight = m * g = 1.25 kg * 9.81 m/s^2 = 12.2625 N
Tension = Weight = 12.2625 N
sin(theta) = Wind force / Tension = 18.3 N / 12.2625 N = 1.492
Since sin(theta) is greater than 1, there is no solution for theta. This means that the rope is not making an angle with the vertical, and is instead being pulled directly to the left by the wind force.
Therefore, the magnitude of the tension in the rope is 12.2625 N, and the rope is being pulled horizontally to the left by the wind force.
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The purpose of the chiller is to
A. remove heat from the air.
B. cool conditioned air.
C. distribute the refrigerant.
D. cool warmed water.
The purpose of the chiller is to remove heat from the air and is therefore denoted as option A.
What is a Chiller?This is a type of device which is referred to as type of a cooling system that removes heat by circulating heat-absorbing a refrigerant through a series of mechanisms through which the heat is released.
The result of this process is that the heat in the air is removed as a result of the refrigerant being adequately circulated and then the environment becomes cooler and is therefore the reason why it was chosen as the correct choice.
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How long will it take a pulse moving at 0, 25 m-s¹ to travel a distance of 20 m?
Answer:
T=80
Explanation:
soln
v=0.25ms
d=20m
t=?
therefore; velocity=distance/time taken
equating the valuables we have
0.25=20/t
making t the subject formula we have
t=20/0.25 => 80s
You weigh 650 N.
What would you weigh if the Earth were
five times as massive as it is and its radius
were five times its present value?
Answer in units of N.
If the earth is 5 times as massive and the radius 5 times its present value, your weight will be 130 N.
How to find the weight of the body?Weight is the amount of gravitational force acting on an object as a result of the gravitational attraction of the Earth.
Assuming gravitational force = [tex]F = \frac{Gm_{1} m_{2} }{r^{2} }[/tex]
where G = 6.67 x 10⁻¹¹m³/kgs², a universal constant.
m = masses of two objects and
r = distance of two objects.
Given that W = 650 N
m₁ = 5Me, new mass of earth
r = 5re, new radius of earth
Then [tex]650 N = \frac{GM_{E} m}{r^{2}_{E} }[/tex]
Let the new weight be [tex]F = \frac{GM m}{r^{2} }[/tex]
Substituting the new mass and radius;
[tex]F = \frac{G(5M_{E}) m}{(5r_{E})^{2}}[/tex]
[tex]F = \frac{5}{25} \frac{GM_{E} m}{r^{2}_{E}}[/tex]
Knowing that [tex]650 N = \frac{GM_{E} m}{r^{2}_{E} }[/tex]
[tex]F = \frac{5}{25}(650 N)[/tex] = 0.2 x 650N
F = 130 N
When the earth is 5 times its radius and 5 times its mass a weight of 650N will become 130 N.
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1. At what displacement the kinetic energy and potential energy of a particle executing SHM will be equal when the amplitude is 3cm?
The displacement at which the kinetic energy and potential energy of a particle executing SHM will be equal when the amplitude is 3cm is 1.5cm.
How does the amplitude of simple harmonic motion affect the ratio of kinetic to potential energy at a specific displacement?The amplitude of simple harmonic motion affects the ratio of kinetic to potential energy at a specific displacement in the following way: as the amplitude increases, the ratio of kinetic to potential energy decreases. This is because the amplitude represents the maximum displacement from the equilibrium position, and as the amplitude increases, the potential energy of the particle increases, while the kinetic energy remains constant. Therefore, at a specific displacement, a particle with a larger amplitude will have a greater proportion of its energy in the form of potential energy, while a particle with a smaller amplitude will have a greater proportion of its energy in the form of kinetic energy.
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Does oil have a greater density than water
Two bodies separated from
each other at a certain distance
started moving simultaneously
to meet each other - one with ar
acceleration of 2.4 m/s, and the
other with an acceleration of 4.8
m/s2. Determine the ratio of the
displacement module of the first
body to the displacement
module of the second body at
the moment of their meeting.
The result of the ratio of the displacement module of the second body at the point of meeting is 0.5.
How to find displacement ratio?To determine the ratio of the displacement of the first body to the displacement of the second body at the moment of their meeting, use the equation of motion:
d = vt + 1/2at²
where d is the displacement, v is the initial velocity, t is the time, and a is the acceleration.
Since the bodies are moving simultaneously towards each other, then assume that their initial velocities are zero. Also, at the moment of their meeting, their displacement will be the same, d₁ = d₂.
Assume that the time at which they meet is t, then:
d₁ = 1/2 * 2.4t²
And the equation for the displacement of the second body:
d₂ = 1/2 * 4.8t²
If d₁ = d₂
then, 1/2 * 2.4t² = 1/2 * 4.8t²
Solving this equation for t and substituting it into the equation for d₁ or d₂, the ratio of the displacement of the first body to the displacement of the second body: d₁/d₂ = 2.4/4.8 = 0.5 or 1/2
So, at the moment of their meeting, the displacement of the first body is half of the displacement of the second body.
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001 (part 1 of 2) 10.0 points
The arm of a crane at a construction site is
16.0 m long, and it makes an angle of 13.9°
with the horizontal. Assume that the max-
imum load the crane can handle is limited
by the amount of torque the load produces
around the base of the arm.
What maximum torque can the crane with-
stand if the maximum load the crane can
handle is 768 N?
Answer in units of N. m.
If the crane can carry a maximum weight of 768 N, the maximum torque it can generate is 2383.4 N
The axis of rotation is the point at which the item rotates, and torque is the twisting force that causes rotation. Due to the fact that it causes an object to rotate along an axis, torque is a rotating force.
The perpendicular component of the force multiplied by the distance is torque.
T = F _|_ T
Part One
T = (768 N cos 13.9°) (16.0 m)
T = 10,368 Nm
Part Two
10368 Nm = (F cos 27.0°) (16.0 m)
F = 2383.4 N
Hence, maximum torque can the crane with-stand if the maximum load the crane can handle is 768 N is 2383.4 N
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If the potential across two parallel plates, separated by 4.0 cm, is 15.0 V, what is the electric field strength in volts per meter?
27 V
0.27 V
380 V
3.8 V
The electric field strength in volts per meter is 380 V. Option D is the correct answer.
What is electric field strength?This refers to the physical field that encloses electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It can also be called the physical field for a system of charged particles or ( E-field).
The electric field strength (E) can be calculated using the b the formula:
E = V / d,
where,
V = the potential difference (in volts)
d = the distance (in meters) between the plates.
Calculating the electric:
V = 15.0 V
d = 0.04 m (4.0 cm converted to meters).
Hence,
E = 15.0 V
0.04 m
= 375 V/m.
E ≈ 380 V
Hence The electric field strength (E) is 380 V.
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in a resonant vibration a body oscillates under the action of a force along a line such that maximum acceleration is equal to maximum velocity. Then frequency of applied force is
If the maximum acceleration is equal to maximum velocity, then frequency of applied force is equal to natural frequency of the vibrating body.
What is simple harmonic motion?
A simple harmonic motion is characterized by this changing acceleration that always is directed toward the equilibrium position and is proportional to the displacement from the equilibrium position.
Mathematically, the formula for the maximum acceleration of a simple harmonic motion is given as;
a ( max ) = ω²A
where;
ω is the angular speed of the oscillatorA is the amplitude of the oscillationResonance vibration is a type of forced vibration in which the natural frequency of vibration of the body is the same as the impressed frequency of external applied force and the amplitude of forced vibration is maximum.
Thus, we can conclude that, the natural frequency of the vibrating body or object is equal to the frequency of the applied force, hence the term resonant vibration.
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Who was the first person to discover and name gas laws 
Answer:
Charles law and Boyle's law, Dalton law of partial pressure, Graham law of diffusion of gases.
Explanation:
let's hangout sometime
A 40kg metal slab at temperature 6000C is taken from a furnace and plunged into 300kg of oil originally at 250C. The final temperature of the oil/slab is 400C. Determine the specific heat capacity of the metal if that of oil is 2100J/kg.0C.
Answer:
I need this message as well so please ket me know when you have it
A potter’s wheel moves from rest to an angular speed of 0.20 rev/s in 32.4 s.
Assuming constant angular acceleration,
what is its angular acceleration in rad/s2?
Answer in units of rad/s^2
A potter’s wheel moves from rest to an angular speed of the angular acceleration is 0.006 rad/s^2.
What is acceleration ?
Acceleration is the rate of change of velocity over time. It is the rate at which an object's speed, or the magnitude of its velocity, changes over time. Acceleration can be positive, negative, or zero depending on the direction of the velocity. For example, if an object is moving in a straight line and its speed increases,
it is said to have a positive acceleration; if its speed decreases, it has a negative acceleration. If the object's speed does not change, then the object is said to have a zero acceleration. Acceleration is a vector quantity, meaning it has both magnitude and direction.
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A roller coaster is moving at 25 m/sec at the bottom of a hill. Three seconds later it reaches the top of the next hill, moving at 10m/sec. What is the acceleration (negative acceleration is slowing down) of the roller coaster?
Acceleration is the rate of change of velocity. It can be calculated using the formula:
a = (vf - vi) / t
Given:
vi = 25 m/s (initial velocity)
vf = 10 m/s (final velocity)
t = 3 s (time interval)
a = (vf - vi) / t = (10 m/s - 25 m/s) / 3 s = -15 m/s^2
The acceleration of the roller coaster is -15 m/s^2.
Negative acceleration indicates that the roller coaster is slowing down. This means that the roller coaster is losing speed as it reaches the top of the hill. The roller coaster is decelerating (negative acceleration) while it climbs the hill, so that it can move with a lower velocity at the top of the hill.
A hiker walks 27.0 km from her base camp at 35° south of east. The next day, she walks 41.0 km in a direction 65° north of east and discovers a forest ranger's tower. Find the magnitude and direction of her resultant displacement between the base camp and the tower.
The magnitude and direction of the hiker's resultant displacement is 42.7 km, 64.6° north of east.
How to find the magnitude and direction?To find the magnitude and direction of the hiker's resultant displacement, we can use vector addition.
First, we need to convert the given magnitudes and directions into x and y components. We can use trigonometry to do this:
x component of the first displacement = 27.0 km * cos(35°) = 21.5 km
y component of the first displacement = 27.0 km * sin(35°) = 15.5 km
x component of the second displacement = 41.0 km * cos(65°) = 17.6 km
y component of the second displacement = 41.0 km * sin(65°) = 30.6 km
Now we can add the x and y components of each displacement to find the x and y components of the resultant displacement:
x component of the resultant displacement = 21.5 km + 17.6 km = 39.1 km
y component of the resultant displacement = 15.5 km + 30.6 km = 46.1 km
To find the magnitude of the resultant displacement, we can use the Pythagorean theorem:
magnitude of the resultant displacement = sqrt(39.1 km^2 + 46.1 km^2) = sqrt(1820.81 km^2) = 42.7 km
Finally, we can use the arctangent function to find the direction of the displacement:
direction = arctan(46.1 km / 39.1 km) = 64.6° north of east.
So the magnitude and direction of the hiker's resultant displacement is 42.7 km, 64.6° north of east.
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. A tire typically has a coefficient of friction around 0.7 in dry conditions. In wet
conditions, the coefficient of friction drops to around 0.4. What is the difference
between the frictional force in dry conditions compared to wet conditions on a car
that has a weight of 14000 N.
Answer:
4300N
Explanation:
FrictionBased on the free body diagram, the friction (fFr in the attached diagram) is dependent on the reaction force (Rn in the attached diagram) acting on the object, in this case a car. The frictional force will always act against the direction of movement (DOM in the attached diagram.)
SolutionGiven the condition is dry,
Summation of forces in the vertical direction (Positive for upward forces) = 0
Reaction Force - Weight of car = 0
Reaction Force = Weight of car = 14000N
Since the friction is dependent on the reaction force with the formula: Coefficient of friction X Reaction Force,
Friction (Dry Condition) = 0.7 * 14000N = 9800N
Now given the condition is wet,
We will use the same formula but with a change to the coefficient of friction.
Friction (Wet Condition) = 0.4 * 14000N = 5600N
Difference between them = 9800N - 5600N = 4300N.
Several vectors in the x-y plane are shown in the figure with their tails at the origin of the coordinate system and with a label at their heads. Two of these vectors are given in terms of the unit-vectors i and j as P = (2.80i + 2.30j) and Q = (-3.90i + 1.20j), where the numbers are measured in meters. Let M = (P+Q). Calculate the magnitude of the vector M.
Several vectors in the x-y plane are shown in the figure with their tails at the origin of the coordinate system and with a label at their heads.The value of M = (P+Q) is
3.65 meters
What is magnitude?Generally, To calculate the magnitude of the vector M = P + Q, we need to use the Pythagorean theorem.
M = P + Q
M= (2.80i + 2.30j) + (-3.90i + 1.20j)
M= (-1.10i + 3.50j)
The magnitude of the vector M is the square root of the sum of the squares of the x and y components of the vector.
|M| = √((-1.10)^2 + (3.50)^2)
= √(1.21 + 12.25)
= √13.46
≈ 3.65 meters
Read more about Pythagorean theorem.
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Calculate the kinetic energy of electron emitted from a surface of potassium metal of wavelength 5.5x10-⁸cm. If the work function of the metal is 3.62x10-¹² joules
Answer:
do it your self like who does that
- The same mass of 5 different substances was used to heat the same mass of water in a simple
calorimeter. The results are shown below. Based on these results, which of these substances made
the worst fuel?
Answer:
Substance ΔH (kJ/g)
Coal -40.23
Hydrogen -242.82
Methanol -252.45
Octane -43.99
Propane -214.46
Explanation:
Methanol made the worst fuel because it has the lowest ΔH value of -252.45 kJ/g, which means that it releases the lowest amount of energy when used as a fuel. The other substances have higher ΔH values, so they produce more heat energy when burned.
