Answer:
because some waste heat is always produced produced in a heat engine.
Explanation:
the fraction of heat input that is converted to a net work output is a measure of the performance of the heat engine and is called the thermal efficiency.Since the machine does not contain a source of energy ,nor can it store energy ,from this conversation of energy the power output of machine can never be greater than its input,so efficiency can be less than 100%.
Explanation:
The efficiency of heat engine is always less than 100% most of the times because of waste energy in form of heat.
Different forms of heating occurs during the working of an engine As the mechanical workings of the engine sets in motion, heat is generated. One of the most common type of the heat is the frictional heating. Therefore, as energy is transformed from one form to another, some are lost as heat. In this regard, the efficiency of the engine suffers.A bicyclist was moving at a rate of 3 m/s, and then sped up to 4 m/s. If the cyclist has a mass of 100 kg, how much work was needed to increase his velocity? (Hint: Use the work-kinetic energy theorem.) O A. 1250 J B. 450 J O c. 350 j D. 800 J
Answer:
i got b but urs is a little different tell me if right
Explanation:
i go 100 on my test
A cup of water plugged by a brown cork is insulated by a second styrofoam cup. A black rod and a thermometer are inserted through the cork into the water. The thermometer is A, the water is B, the outer cup is C. This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment. This part contains a known amount of water, which is placed there before the experiment starts. This part is where the metal is placed at the beginning of the experiment. This part is used for measuring the initial and final temperatures of the water.
The part that insulates the reaction chamber from the transfer of heat to or from the surrounding environment is (C).
How to illustrate the information?It should be noted that the cup of water plugged by a brown cork is insulated by a second styrofoam cup.
In this case, the black rod and a thermometer are inserted through the cork into the water.
This part that contains a known amount of water, which is placed there before the experiment starts is (B).
This part is where the metal is placed at the beginning of the experiment is (B).
This part that is used for measuring the initial and final temperatures of the water is (A).
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Answer:
Explanation:
C
B
B
A
Edge 2022
Convert 90 mph into meter seconds and feer seconds 1 mile equals 1600 m 1 m equals 3.3 feet one hour equals 3600 seconds
The speed of 90 mph converted into meter per seconds and feet per seconds is 40 m/s and 132 ft/s respectively.
Hw can the speed of 90 mph be converted into meter per seconds and feet per seconds?The speed of an object or body is the distance covered per unit time.
Speed = distance/timeThe given speed is in miles per hour.
To convert miles per hour to meter per second, the following steps are followed;
1 mile = 1600 m
90 miles = 90 * 1600 = 144000 m
1 hour = 3600 s
90 mph in m/s = 144000/3600
90 mph in m/s = 40 m/s
To convert meter per second to feet per second, the following steps are followed;
1 m = 3.3 ft
144000 m = 3.3 * 144000 = 475200 ft
1 hour = 3600 s
90 mph in ft/s = 475200/3600
90 mph in ft/s = 132 ft/s
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You are testing a water heater design. One criterion is that the water heater heat water to a temperature of 180 °F. During testing, you find that the water in the water heater reaches a temperature of 200 °F. What would you do next?
Answer:
Explanation:
If the required max temperature needs to be 180 °F but the water temperature is hitting 200 °F then it is surpassing the desired temp and therefore failing to complete its purpose. Therefore, the next step would be to adjust the design and add a thermometer sensor to stop the water heater once the water temperature reaches the desired 180 °F. This would make the water heater serve its purpose as intended.
if a certain car, going with speed v1, rounds a level curve with a radius r1, it is just on the verge of skidding. if its speed is now doubled, the radius of the tightest curve on the same road that it can round without skidding is:
Answer:
The correct answer is 4R1
Explanation:
According to the given scenario ,the radius of the tightest curve on the same road without skidding is as follows:
As we know that
Centeripetal Acceleration is
= v^2 ÷ r
In the case when velocity becomes 2 times so the r would be 4 times
So, the radius of the tightest curve on the same road without skidding is 4R1
As the temperature of a blackbody increases, what happens to the peak wavelength of the light it radiates
Answer:
The peak wavelength of the light it irradiates decreases
Explanation:
As the temperature of a blackbody increase, the peak wavelength of the light it radiates decreases, this follows Wien's Law.
A blackbody is an ideal substance that emits all frequencies of light and also has the ability to absorb them as well.
Wiens displacement law, explains that the position of the peak wavelength of the thermal radiation emitted by bodies can change with temperature, and as the temperature increases beyond a certain point, the wavelength begins to reduce. This often changes the colour of the light emitted from heated objects.
Answer:
The peak wavelength increases.
Explanation:
I just took the test this is correct.
cooking utensils are made up of metal
Explanation:
Cooking utensils are made of metal such as copper, aluminium, brass, steel etc., so that heat is easily conducted through the base to their contents. But they are provided with handles of bad conductors
Choose the correct answer
Answer:
1.(c) 7
2.(d) 900
3.(b) two
4.(c) 0.0007
5.(d)0.0004
Explanation:
(1) White light after reflection through prism splits into 7 colors.
(2) Arabs and Chinese knew about lenses in about 900 AD
(3) There are Two more colors in the spectrum which cannot be seen with naked eye.
(4) Wavelength of red light is 0.0007mm
(5) Wavelength of violet light is 0.0004mm
a 16-slug mass is raised by 10 ft. the PE of the mass increased by?
Answer:
The PE of the mass increased by 6,972.95 J
Explanation:
Gravitational Potential Energy
It's the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U=m.g.h
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or 9.8 m/s^2.
We are given the mass of m=16 slug raised by a height h=10 ft. Both units will be converted to SI standard:
1 slug = 14.59 Kg, thus
16 slug = 16*14.59 Kg=233.44 Kg
1 ft = 0.3048 m, thus:
10 ft = 10*0.3048 m = 3.048 m
Thus, the PE of the mass increased by:
U = 233.44 * 9.8 * 3.048 = 6,972.95 J
the PE of the mass increased by 6,972.95 J
The potential energy will be "5120 ft.lb".
According to the question,
Mass,
m = 16 slugsHeight,
h = 10 ftAs we know the formula,
→ [tex]U = mgh[/tex]
By substituting the values, we get
→ [tex]= 16\times 32\times 10[/tex]
→ [tex]= 5120 \ ft.lb[/tex]
Thus the response above is correct.
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In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?Question 1 options:
A. Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved
B. Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model
C. all answers given are correct
D. This is because no energy is being created or destroyed in this system
Answer:
Answer:B
Explanation:
Because it all stayed consistant
What causes the magnetic field around the wire?
Magnetic field
O A. An electric current
O B. An electric field
PREVIOUS
An electric current causes the magnetic field around the wire. The correct answer is A.
The magnetic field around a wire is caused by the flow of electric current through the wire. When an electric current passes through a wire, it generates a magnetic field that forms circular lines of magnetic flux around the wire. This phenomenon is described by Ampere's law, which states that a magnetic field is produced by an electric current and its strength is directly proportional to the magnitude of the current.
The relationship between the electric current and the magnetic field can be understood using the right-hand rule. If you wrap your right hand around the wire with your thumb pointing in the direction of the current, the curled fingers indicate the direction of the magnetic field lines.
Therefore, an electric field is generated by an electric charge, not by an electric current. While an electric field can exist around a wire if there is a potential difference (voltage) applied across it, it is the flow of electric current that primarily generates the magnetic field.
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An object with mass 3.3 kg is executing simple harmonic motion, attached to a spring with spring constant 260 N/m . When the object is 0.017 m from its equilibrium position, it is moving with a speed of 0.40 m/s . Part A Calculate the amplitude of the motion. Express your answer to two significant figures and include the appropriate units.
Answer: the amplitude of the motion is 0.048 m
Explanation:
Given that;
mass m = 3.3 kg
spring constant k = 260 N/m
When the object is x = 0.017 m from its equilibrium position,
it is moving with a speed of v = 0.40 m/s
amplitude of the motion = ?
we know that;
formula for Potential of the string PE = 1/2kx²------1
Kinetic energy KE = 1/2mv² --------2
Now expression for the maximum potential energy of the spring is
PE_max = 1/2 kx²_max -----3
Now from conservation of Energy
PE_spring = PE + KE
from our equation 1, 2 and 3
1/2kx²_max = 1/2kx² + 1/2mv²
now we rearrange for x_max
x²_max = (1/2kx² + 1/2mv²) / 1/2k
x²_max = (kx² + mv²) / k
x_max = √ [(kx² + mv²) / k]
now we substitute our values into the equation
x_max = √ [(260(0.017)² + 3.3×(0.40)²) / 260]
= √((0.07514 + 0.528) / 260)
= √(0.60314 / 260)
= √ 0.002319
x_max = 0.048 m
Therefore the amplitude of the motion is 0.048 m
Which statement best describes why specific heat capacity is often more useful than heat capacity for scientists when comparing two materials?
Answer:
Specific heat capacity is an intensive property and does not depend on sample size.
Explanation:
4. AN OBJECT INCREASES ITS VELOCITY
FROM 22 M/S TO 36 M/S IN 5 S. WHAT IS
THE ACCELERATION OF THE OBJECT?
ET
Answer:
it is accelerating 14 m/s
Explanation:
Answer: 14/5
Explanation:
The object changed its velocity from 22 m/s to 36 m/s which is an increase of 14 m/s
This occurred in 5 seconds so the acceleration is 14/5 = 2.8 m/s^2
what is the velocity of this graph between points b and c
Answer:
D.) 0 m/s
Explanation:
This is a position versus time graph. These graphs compare the position of an object versus the elapsed time. You can find the velocity of position vs. time graphs by determining the slope between the two points.
The formula used to find slope is:
y₁ - y₂ = m(x₁ - x₂)
In this formula, "x₁" and "y₁" represent the values from one point, "x₂" and "y₂" represent the values from the second point, and "m" represents the slope.
If the first point, B, is at (1, 6) and the second point, C, is at (3, 6)...
6 - 6 = m(1 - 3) <----- Insert values from points
0 = m(-2) <----- Subtract
0 = m <----- Divide both sides by -2
In this case, the slope between point B and point C is 0. Thus, there is a constant velocity of 0 m/s between the points.
In an oil drop experiment, a drop with a weight of 1.9 x 10-14 N was suspended when the potential difference between 2 plates that were 63 mm apart was 780 V. What was the charge on the drop?
Answer:
Study More You will get it :L
Starting at rest, A car accelerated to 20m/s in 4s. How far did the car travel as it sped up. Assume constant acceleration?
Answer:
40 m
Explanation:
displacement = 1/2 a t^2
= 1/2 ( 20/4) (4^2)
40 m
Forces that cancel each other are called_ forces \
Answer:
balanced forces
1. On a force vs. mass graph, what would be the slope of the line?
2. On a Free Body Diagram, if the forces are all balanced, what do you know about the
object? Can it be moving?
1. By Newton's second law,
F = m a
so the slope of the line would represent the mass of the object.
2. If all the forces are balanced, then the object is in equilibrium with zero net force, which in turn means the object is not accelerating. So the object is either motionless or moving at a constant speed.
Girl runs 40m due south in 40 seconds,he then return to North,20m in 10 seconds,, calculate
1. average speed
2.average velocity
3.change in velocity
4.acceleration
Suppose you are told that acceleratioon A with of particle moving with uniform sleep v in a circle of radius R is proportional to same power of r(r) and same power of V. Determine the radius of A in and write the Simple form of equation for the acceleratioon
The equation for centripetal acceleration is:
[tex]A = \frac{V^{2} }{R}[/tex]
Centripetal acceleration is the rate at which a body moves through a circle. Due to the fact that velocity is a vector quantity (i.e., it has both a magnitude, the speed, and a direction), when a body travels in a circle, its direction is continually changing, which causes a change in velocity, which results in an acceleration.
The equation for centripetal acceleration is:
[tex]A = \frac{V^{2} }{R}[/tex]
therefore, the centripetal acceleration, denoted by the symbol A, has a magnitude equal to the square of the body's velocity along the curve divided by the radius of the circle, denoted by the symbol r. Units for centripetal acceleration are metres per second squared.
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A series circuit has a 12-volt power source and two resistors of 1 ohm and 2 ohms respectively. How many amps will flow when
the circuit is closed?
Answer:
ayoooooooo
Explanation:
The terms transverse or longitudinal are often used to describe the types of pulses. To what feature of a pulse do these terms refer:____________
Explanation:
Transverse pulse or waves are those in which elements of the pulse move perpendicular to the propagation of the pulse. Whereas, Longitudinal waves are those in which elements of the wave are in same direction as the propagation of the wave. For example Light is a transverse pulse whereas sound is a longitudinal wave.
A 5.0-m-diameter merry-go-round is turning with a 3.7 s period. Part A What is the speed of a child on the rim
Answer:
Speed of a child on the rim is 4.25 m/s.
Explanation:
Given;
diameter of the merry-go-round, d = 5.0 m
period of the motion, t = 3.7 s
one complete rotation of the merry-go-round = πd
one complete rotation of the merry-go-round = π(5) = 15.71 m
Speed is given as distance / time
speed of a child on the rim = 15.71 / 3.7
speed of a child on the rim = 4.25 m/s
Therefore, speed of a child on the rim is 4.25 m/s.
What is the frequency of a pendulum that is moving at 30
m/s with a wavelength of 0.32 m?
Answer:
85.7Hz
Explanation:
v=f*λ
f = frequency
λ = wavelength
The frequency of the pendulum which is moving with a velocity of 30 m/s with a wavelength of 0.32 m is 93.75 Hz.
What is Frequency?The term frequency refers to the number of waves which are passing a fixed point in the unit time. Frequency also describes the number of cycles or the vibrations which are undergone during one unit of time through an object or a body in periodic motion. The SI unit of frequency is Hertz (Hz).
Wavelength = Velocity/ Frequency
Frequency = Velocity/ Wavelength
Frequency = 30/ 0.32
Frequency = 93.75 Hz
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A student adds two vectors of magnitudes 48 m and 22 m. What are the maximum and minimum possible values for the resultant of these two vectors.
Answer:
Maximum=70 m
Minimum=26 m
Explanation:
Vector Addition
Since vectors have magnitude and direction, adding them takes into consideration not only the magnitudes but also their respective directions. Two vectors can be totally collaborative, i.e., point to the same direction, or be totally opposite. In the first case, the magnitude of the sum is at maximum. Otherwise, it's at a minimum.
Thus, the maximum magnitude of the sum is 48+22 = 70 m and the minimum magnitude of the sum is 48-22= 26 m
Why does a stop sign appear red?
Answer:
because it’s suppose to be red like a stop light.
Explanation:
So it tells you to stop
What is the final velocity of an object that starts from rest and accelerates uniformly at 4
m/s2 over a distance of 8 m?
Answer:
8m/s
Explanation:
Given parameters:
Initial velocity = 0m/s
Acceleration = 4m/s²
Distance = 8m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we use the right motion equation and find the unknown.
The right motion equation to solve this problem is given as :
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the unknown acceleration
S is the distance
Now insert the parameters and solve;
v² = 0² + 2 (4) (8)
v² = 64
v = 8m/s
A monatomic ideal gas with volume 0.230 L is rapidly compressed, so the process can be considered adiabatic. If the gas is initially at 1.01 105 Pa and 3.00 102 K and the final temperature is 489 K, find the work done by the gas on the environment, Wenv.
Answer:
The value is [tex]W = - 17.53 \ J[/tex]
Explanation:
From the question we are told that
The volume is [tex]V = 0.230 \ L = 0.230 *10^{-3} \ m^{-3}[/tex]
The initial pressure is [tex]P_1 = 1.01105 \ Pa[/tex]
The initial temperature is [tex]T_1 = 3.00*10^2 \ K[/tex]
The final temperature is [tex]T_2 = 489 \ K[/tex]
Generally for an adiabatic process the workdone is mathematically represented as
[tex]W = - \Delta U[/tex]
Here [tex]\Delta U[/tex] is the internal energy of the system which is mathematically represented as
[tex]\Delta U = \frac{3}{2} * nR \Delta T[/tex]
So
[tex]W = - \frac{3}{2} * nR \Delta T[/tex]
Generally from ideal gas equation we have that
[tex]n = \frac{P_1V }{ RT_1 }[/tex]
Here R is the gas constant with value [tex]R = 8.314 J/mol\cdot K[/tex]
So
[tex]n = \frac{1.01 *0^{5} * 0.230 *10^{-3}}{ 8.314 * 3.0*10^2 }[/tex]
=> [tex]n = 0.009313 \ mol[/tex]
So
[tex]W = - \frac{3}{2} * 0.009313 * 8.314 * (451 - 3.00*10^2)[/tex]
=> [tex]W = - 17.53 \ J[/tex]
Arvin, the ant, is on a picnic table. He travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is total distance traveled by Arvin?
Answer:
The total distance traveled by Arvin is 70 cm.
Explanation:
Distance and Displacement
A moving object constantly travels for some distance at defined periods of time. The total distance moved is the sum of each individual distance the object traveled. It can be written as:
dtotal=d1+d2+d3+...+dn
This sum is obtained independently of the direction the object moves.
The displacement only takes into consideration the initial and final points of the path defined by the object while it's moving. The displacement, unlike distance, is a vectorial magnitude and can be even zero if the object starts and ends the movement at the same point.
Arvin, the ant, moves 30 cm eastward, then 25 cm northward, and finally 15 cm westward. The total distance traveled is 30 cm+25 cm + 15 cm = 70 cm.
The total distance traveled by Arvin is 70 cm.