**WRITE SHORT ANSWER**
WRITE ONE ADVANTAGE AND ONE DISADVANTAGE OF ALCOHOL AS A LIQUID USED IN THERMOMETERS
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DIFFERENCE IN FORCES BETWEEN SOLID AND GAS PARTICLES
Ans =
TWO FACTORS TO INCREASE RATE OF EVAPORATION IN LIQUID
Ans =
Answers
Answer:
WRITE ONE ADVANTAGE AND ONE DISADVANTAGE OF ALCOHOL AS A LIQUID USED IN THERMOMETERS
Advantage: Alcohol has a high expansivity.
Disadvantage: Alcohol is not opaque, this may give wrong temperature readings.
DIFFERENCE IN FORCES BETWEEN SOLID AND GAS PARTICLES :
Answer: Solids have stronger intetmolecular forces of attraction than gases.
TWO FACTORS TO INCREASE RATE OF EVAPORATION IN LIQUID :
Answer: Decreasing the volume of the container containing the liquid. This will increase vapour pressure as well the rate of evaporation .
\(.\)
WRITE ONE ADVANTAGE AND ONE DISADVANTAGE OF ALCOHOL AS A LIQUID USED IN THERMOMETERS
Advantage: Alcohol has a high expansivity.
Disadvantage: Alcohol is not opaque, this may give wrong temperature readings.
DIFFERENCE IN FORCES BETWEEN SOLID AND GAS PARTICLES :
Answer: Solids have stronger intetmolecular forces of attraction than gases.
TWO FACTORS TO INCREASE RATE OF EVAPORATION IN LIQUID :
Answer: Decreasing the volume of the container containing the liquid. This will increase vapour pressure as well the rate of evaporation .
Related Questions
A red ball reflects which of the following colors of light?
A)
red
B)
all colors but red
C)
green
D)
white
Answers
Answer:
If white light shines on a red ball, the ball reflects back mostly red light, and so we see red. Most of the greens and blues that are part of white light are absorbed by the ball so we cannot see them. Likewise, a blue book is reflecting the blue part of the white light spectrum.
A potter’s wheel moves from rest to an angular speed of 0.10 rev/s in 27.7 s.Assuming constant angular acceleration,what is its angular acceleration in rad/s2?Answer in units of rad/s2.
Answers
The angular acceleration of the potter's wheel = 0.023 rad/s²
Explanation:At rest, the angular speed, w₀ = 0 rad/s
Final angular speed, w = 0.10 rev/s
Convert 0.10 rev/s to rad/s
\(\begin{gathered} w=0.10\times2\pi\text{ rad/s} \\ w=0.10\times2\times3.142 \\ w=0.6284\text{ rad/s} \end{gathered}\)Time, t = 27.7 s
To find the angular acceleration, use the equation:
\(w=w_0+\alpha t\)Substitute w = 0.6284 rad/s, w₀ = 0 rad/s, and t = 27.7 s into the equation above
\(\begin{gathered} w=w_0+\alpha t \\ 0.6284=0+\alpha(27.7) \\ 27.7\alpha=0.6284 \\ \alpha=\frac{0.6284}{27.7} \\ \alpha=0.023rad/s^2 \end{gathered}\)The angular acceleration of the potter's wheel = 0.023 rad/s²
Determine the required radius for the Sun to become a Black Hole. Write the name for the radius
Answers
Given:
The mass of the sun is
\(M_{sun}=1.989\times10^{30}\text{ kg}\)The universal gravitational constant is
\(G\text{ = 6.67}\times10^{-11}\text{ Nm}^2\text{ /kg}^2\)The speed is
\(c=\text{ 3}\times10^8\text{ m/s}\)To find the required radius for the sun to become a black hole.
Explanation:
The radius can be calculated as
\(\begin{gathered} r=\frac{2GM}{c^2} \\ =\frac{2\times6.67\times10^{-11}\times1.989\times10^{30}}{(3\times10^8)^2} \\ =2948\text{ m} \end{gathered}\)The name of the radius is Schwarzschild radius.
sam, whose mass is 80 kg , takes off across level snow on his jet-powered skis. the skis have a thrust of 170 n and a coefficient of kinetic friction on snow of 0.1. unfortunately, the skis run out of fuel after only 13 s .
Answers
The distance covered by Sam within the first 13 seconds is 96.75 m.
Equation :Given that the mass m of Sam is 80 kg and the force F is 170 N. The coefficient of friction is 0.1.
The net force is given below
Fₙ = F - F₁
Where Fₙ is the net force and F₁ is the friction force.
Fₙ = 170 - μmg
Fₙ = 170 - 0.1 x 80 x 9.8
Fₙ = 91.6
Fₙ = ma
91.6 = 80 x a
a = 91.6 / 80
a = 1.145 m/s²
For the first 13 seconds.
So, the distance covered by Sam with this acceleration is given .
s = ut + 1/2 at²
u is the initial velocity which will be zero and t is the time interval.
So,
s = 1/2 at²
s = 1/2 x 1.145 x 13²
s = 96.75 m
Hence, the distance covered by Sam within the first 13 seconds is 96.75 m.
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Question 4 of 10
Which option is a good blackbody radiator?
O A. A lightbulb
O B. A balloon
O C. A person
O D. A mirror
SUBM
Answers
Answer:
A lightbulb
Explanation:
Answer:
Lightbulb
Explanation: got it right
Which will have the greater acceleration rolling down an incline— a bowling ball or a volleyball?
Answers
Answer:
Bowling ball
Explanation:
The bowling ball's mass will make it roll down the incline faster than the lighter volleyball.
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what principle is responsible for light spreading as it passes through a narrow slit? a) refraction b) polarization c) diffraction d) dispersion
Answers
The principle responsible for light spreading as it passes through a narrow slit is diffraction hence correct choice is c) diffraction.
The act of bending light around corners such that it spreads out and illuminates regions where a shadow is anticipated is known as diffraction of light. In general, since both occur simultaneously, it is challenging to distinguish between diffraction and interference.
Diffraction occurs when a wave, such as light, encounters an obstacle or a slit and bends around it, causing the wave to spread out. In the case of light passing through a narrow slit, this spreading results in an interference pattern that can be observed on a screen placed behind the slit.
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Is speed always equal to velocity?
Answers
Answer: Speed can equal to velocity, even though they have different formulas.
Explanation: Speed is the rate at which an object covers distance or how much space the object passed, which is usually measured in miles, meters, or kilometers. Velocity is the rate at which the position changes. Therefore, speed is and can equal to velocity.
Formulas:
Speed = distance/change in time
Velocity = change in distance/ change in time
A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air? Part 1 of 2 The speed of the plane in still air is Part 2
Answers
The speed of the wind is 17 mph and the speed of the plane in still air is 119 mph.
Let the speed of the plane be x and the speed of the wind be y. Then, the speed of the plane with the wind becomes x + y, while the speed of the plane against the wind is x - y.
The distance traveled with the wind in 3 hours is 408 miles.
Therefore, we can write the equation as:
3(x + y) = 408
Divide both sides by 3:
x + y = 136 .... (1)
The distance traveled against the wind in 4 hours is also 408 miles.
Therefore, the equation can be written as:
4(x - y) = 408
Divide both sides by 4:
x - y = 102 .... (2)
Now we can solve these two equations using the elimination method.
Add equations (1) and (2):
x + y + x - y = 136 + 1022x = 238x = 119 mph
Therefore, the speed of the plane in still air is 119 mph.
Now, substitute this value of x in equation (1):
119 + y = 136y = 17 mph
Therefore, the speed of the wind is 17 mph.
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The correct question is:
A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air?
Capacitance is the measure of a capacitors ability to store an electrical charge.
a. true
b. false
Answers
True
Capacitance is the ability of a component or circuit to collect and store energy in the form of an electrical charge.
what is electric charge?Electric Charge is the property of subatomic particles that causes them to experience a force when put in an electric and magnetic field. Electric charges are of two sorts: Positive and Negative, commonly carried by charge carriers protons and electrons.
Electric charge is a scalar quantity. Apart from having a magnitude and direction, a quantity to be named a vector ought to too comply the laws of vector addition, such as triangle law of vector addition and parallelogram law of vector addition; as it were at that point the amount is said to be a vector quantity. When two currents meet at a intersection, within the case of an electric current, the resultant current of these will be an algebraic sum and not the vector whole. Subsequently, an electric current may be a scalar quantity, in spite of the fact that it has magnitude and direction.
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Describe 2 potential problems or limitations of ratio
analysis.
Answers
2. Overlooking External Factors: Ratio analysis primarily focuses on internal operations of a company, but there are various external factors like market conditions, industry trends, and economic cycles that can significantly impact a company's performance. These factors might not be reflected directly in the financial ratios, thus potentially leading to an incomplete understanding of the company's overall situation.
5. What's the temperature -10°C in kelvins?
Answers
Answer:
263.15
. . . . . . . . . .. ... . . . . . .. . . . . . . . ... .
NEED HELP!!!! 15 POINTS!!!!!!!
Why is it important to have both long-term and short-term goals?
A.
Short-term goals can get repetitive, so long-term goals help maintain motivation.
B.
Short-term goals are more achievable while long-term goals are more unrealistic.
C.
Long-term goals take planning and are easier to accomplish than short-term goals.
D.
Long-term goals are often inspirational, so they are easier to meet than short term goals.
PLEASE NO LINKS
Answers
How much energy does it take to boil water for pasta? For a one-pound box of pastayou would need four quarts of water, which requires 15.8 kJ of energy for every degreeCelsius (°C) of temperature increase. Your thermometer measures the startingtemperature as 48°F. Water boils at 212°F.a. How many degrees Fahrenheit (°F) must you raise the temperature?b. How many degrees Celsius (°C) must you raise the temperature?c. How much energy is required to heat the f
Answers
The thermometer measures the starting temperature as,
\(T_1=48^{\circ}F\)The temperature required for the boiling the water is
\(T_2=212^{\circ}F\)(a). The temperature requires to boil is,
\(\begin{gathered} T=T_2-T_1 \\ T=212-48 \\ T=164\text{ F} \end{gathered}\)what is the difference between positive and negative work? (no links)
Answers
Answer:
Positive work is said to be done when the force acting on a body produces a displacement in the direction of the force. Negative work is said to be done when the force acting on a body produces a displacement opposite to the direction of the force
Explanation:
When the displacement of the body the in the direction of the force then the work done is positive. For example :- a man pushing a car in a straight path.
When the displacement is in a direction opposite to the direction of the force then the work done is said to be negative. For example :- work done by the friction.
Question 3 of 10
Why do electric charges that move through a magnetic field produce an
electric current?
A. The magnetic field exerts a force on only the negative charges in
the wire.
B. The magnetic field exerts a force on only the positive charges in
the wire.
C. The magnetic field pushes negative charges and positive charges
in the same direction.
D. The magnetic field pushes negative charges and positive charges
in opposite directions.
Answers
Answer: D
Explanation: a p e x :)
Answer:
B. The magnetic field pushes negative charges and positive charges in opposite directions.
A book weighing 10 kg is preparing to fall off the desk from a 1 meter height. The book's
gravitational potential energy is 980 Joules.
O True
O False
Answers
Answer:
False
Explanation:
gravitational potential energy = mgh
10*10*1 = 100 joules
An AC circuit carries an RMS current of 7.0 Amps. The current travels through a 12 Ohm resistor. a What is the peak current? b. What is the power dissipated in the resistor? c. What is the peak voltage drop across the resistor!
Answers
For an A.C circuit the peak current is 9.899 Amps, the power dissipated is 587.9 W, and, the peak voltage drop is 118.7 V respectively.
Given information,
RMS current, Ir = 7.0 Amps
Resistance, r = 12 Ohm
a) The peak current, Ip
Ir = Ip/√2
7.0 = Ip/√2
Ip = 7.0×√2
Ip = 9.899Amps
Hence, the peak current is 9.899Amps.
b) Power dissipated is,
P = 1/2 Ip² ×r
P = 1/2×96.04×12
P = 587.9 W
Hence, the power dissipated is 587.9 W.
c) Peak voltage drop, V
V = Ip ×r
V = 9.899 × 12
V = 118.7 V
Hence, the Peak voltage drop is 118.7 V.
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you step into an elevator, and it accelerates to a downward speed of 4.3 m/sm/s, after which its speed is constant. your apparent weight during the acceleration is 85% of your actual weight.
Answers
The apparent weight of the person in the elevator during acceleration is 85% of their actual weight.
When an elevator accelerates, there is an upward or downward force acting on the passengers inside. In this case, the elevator is accelerating downward, which means there is a net downward force acting on the person. This force is responsible for the person's apparent weight, which is different from their actual weight.
During the acceleration phase, the apparent weight is 85% of the actual weight. This means that the net force acting on the person is equal to 85% of their weight. The remaining 15% of the weight is counteracted by the normal force exerted by the elevator floor.
Once the elevator reaches a constant speed, it is no longer accelerating. At this point, the net force acting on the person becomes zero, and their apparent weight matches their actual weight. The normal force exerted by the elevator floor is now equal to their full weight, balancing the force of gravity.
It's important to note that the apparent weight is determined by the net force acting on the person, which is the difference between the force of gravity and the normal force.
When the elevator accelerates, this net force changes, leading to a difference between the apparent weight and the actual weight. However, once the elevator reaches a constant speed, the net force becomes zero, and the apparent weight returns to the actual weight.
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what is measured using micrometer?
Answers
Explanation:
A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers
During a spacewalk, an astronaut lets go of a tool, causing it to float away and bounce off the side of the space shuttle. The astronaut saw the the tool hit the shuttle but did not hear it hit the shuttle. Why would the astronaut be able to see the tool hit the shuttle but not hear it hit the shuttle?
A.
Neither sound waves nor light waves can travel through a vacuum.
B.
Sound waves can not travel through a vacuum but light waves can.
C.
Both sound waves and light waves can travel through a vacuum.
D.
Light waves can not travel through a vacuum but sound waves can.
Answers
Answer:
B mate
Explanation:
When a ray enters into air from glass slab
a) its wavelength decreases
b) it's wavelength increases
c) it's frequency increases
d) it's frequency decreases
Answers
Answer:
a ) Its wavelength decreases
Explanation:
When a ray enters into air from glass slab its wavelength decreases.
What are the 3 ideal gas laws?
Answers
Answer:
Boyle's law, Charles's law, and Avogadro's law
Explanation:
PLS HELP ME
a bullet is fired with a velocity of 150m/s at an angle of 15° to the horizontal.Calculate the range of the bullet (g=10m/s)
Answers
The range of the bullet is 1,125 m.
What is the range of bullet?The range of the bullet is the maximum horizontal distance travelled by a projectile and it can be calculated by applying the following formula.
R = ( u² sin ( 2θ ) / g
where;
u is the initial velocity of the bullet = 150 m/sθ is the angle of projection of the bullet = 15°g is the acceleration due to gravity = 10 m/s²The range of the bullet is calculated as follows;
R = ( u² sin ( 2θ ) / g
R = ( 150² sin ( 2 x 15 ) / 10
R = 1,125 m
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A circuit with 0.1 A running through the battery and two 14 Ω resistors in parallel. What is the voltage of the battery?
Answers
Given that the two resistors are connected in parallel and each resistance is 14 ohms.
The current in the circuit is I = 0.1 A.
We have to find the voltage of the battery.
Let the voltage be denoted by V.
First, we have to find the equivalent resistance.
\(\begin{gathered} \frac{1}{R_P}=\frac{1}{14}+\frac{1}{14} \\ =\frac{2}{14} \\ R_p=7\text{ ohm} \end{gathered}\)The equivalent resistance is 7 ohm.
According to Ohm's law, the voltage can be calculated by the formula
\(\begin{gathered} V=R_pI \\ =7\times0.1 \\ =0.7\text{ V} \end{gathered}\)Thus, the voltage of the battery is 0.7 V.
A gas at 110kPa and 30 degrees celsius fills a flexible container to a volume of 2L. If the temperature was raised to 80 degrees celsius and the pressure to 440kPa, what is the new volume
Answers
To determine the new volume of the gas when the temperature and pressure change, we can use the combined gas law equation, which relates the initial and final states of a gas:
(P₁ * V₁) / (T₁) = (P₂ * V₂) / (T₂)
Given:
Initial pressure (P₁) = 110 kPa
Initial temperature (T₁) = 30 °C = 30 + 273.15 K
Initial volume (V₁) = 2 L
Final pressure (P₂) = 440 kPa
Final temperature (T₂) = 80 °C = 80 + 273.15 K
New volume (V₂) = ?
Substituting the given values into the combined gas law equation, we have:
(110 * 2) / (30 + 273.15) = (440 * V₂) / (80 + 273.15)
Simplifying the equation further, we can solve for V₂:
(220 / 303.15) = (440 * V₂) / (353.15)
Now, we can calculate the new volume by rearranging the equation:
V₂ = (220 / 303.15) * (353.15 / 440)
By performing the calculations, we can find the value of V₂, which represents the new volume of the gas after the change in temperature and pressure.
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Wavelength Division Multiplexing (WDM) is used to combine several optical channels (i.e., wavelengths) into an aggregate broadband signal that is transmitted over fiber optic cable.
True
False
Answers
The given statement "Wavelength Division Multiplexing (WDM) is used to combine several optical channels (wavelengths) into an aggregate broadband signal that is transmitted over fiber optic cable" is True because this allows for increased capacity and efficient use of the available bandwidth.
Wavelength Division Multiplexing (WDM) is a technology used in optical communication systems to increase the capacity of fiber optic cables by allowing multiple optical signals to be transmitted over a single fiber optic cable. WDM works by combining several optical channels (i.e., wavelengths) into an aggregate broadband signal that is transmitted over the fiber optic cable.
In a WDM system, each optical channel is modulated with its data signal and then combined with other channels to form a single composite signal. This composite signal is then transmitted over a single fiber optic cable. At the receiving end, the composite signal is separated into individual optical channels using a demultiplexer, and each channel is then demodulated to recover its original data signal.
WDM technology is typically used in long-haul optical communication systems, such as those used by telecommunications carriers to transmit voice, data, and video signals over long distances. By using WDM, multiple optical signals can be transmitted over a single fiber optic cable, increasing the capacity of the cable and reducing the need for additional cable installations.
WDM technology has several advantages over other optical communication technologies, including higher data rates, longer transmission distances, and greater resistance to electromagnetic interference. As a result, it has become a widely used technology in the telecommunications industry and is an important component of many modern optical communication systems.
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Deprotonation of a terminal alkyne results in an alkynide ion, which exhibits a negative charge associated with a lone pair that occupies a(n) ___________ orbital.
Answers
Deprotonation of a terminal alkyne results in an alkynide ion, which exhibits a negative charge associated with a lone pair that occupies a(n) sp hybridized orbital.
When a terminal alkyne undergoes deprotonation, the removal of a proton from the terminal carbon atom results in the formation of an alkynide ion. The alkynide ion contains a negative charge that is associated with a lone pair of electrons, which occupies a p-orbital. This p-orbital is perpendicular to the plane of the molecule and lies along the axis of the carbon-carbon triple bond.
The alkynide ion is a very strong base due to the stability of the resulting anion. This base can be used in various reactions to form new carbon-carbon bonds or as a nucleophile in substitution reactions. Additionally, alkynide ions can be used as ligands in organometallic chemistry due to their ability to donate electrons to metal centers. In summary, deprotonation of a terminal alkyne leads to the formation of an alkynide ion that has a negative charge associated with a lone pair of electrons occupying a p-orbital.
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In order to maximize the rate at which energy is supplied to a resistive load, the power factor of an RLC circuit should be as close as possible to:
Answers
In order to maximize the rate at which energy is supplied to a resistive load, the power factor of an RLC circuit should be as close as possible to 1, or unity power factor. The power factor represents the efficiency of power transfer in an electrical circuit.
A resistive load dissipates real power and performs useful work, while reactive components (inductors and capacitors) in the circuit store and release energy. Reactive power, which oscillates back and forth between the source and reactive components, does not contribute to the actual work performed by the resistive load.
By having a power factor close to 1, the reactive power is minimized, and more of the total power supplied to the circuit is utilized by the resistive load. This leads to a higher rate of energy supply and improved overall efficiency.
A power factor close to 1 indicates that the reactive power is small compared to the real power, meaning that most of the power delivered by the source is effectively used by the resistive load. Therefore, maximizing the rate of energy supply to a resistive load requires a power factor as close as possible to 1 in an RLC circuit.
Having a power factor close to 1 is crucial for maximizing the rate at which energy is supplied to a resistive load in an RLC circuit. This ensures that most of the power delivered by the source is effectively utilized by the resistive load, minimizing energy losses due to reactive power.
By optimizing the power factor, the circuit operates with greater efficiency and delivers power to the load more effectively. It is important to design and tune RLC circuits to achieve a power factor as close to 1 as possible, thereby maximizing the rate of energy supply and promoting efficient utilization of electrical power.
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explain how siphon works with atmospheric pressure?
Answers
Answer:
A siphon is a tube that allows liquid to travel upward, above the surface of the origin reservoir, then downwards to a lower level without using a pump. When a certain amount of water moves over the bend in the siphon, gravity pulls it down on the longer leg lowers the atmospheric pressure in the bend of the siphon.
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Explanation: