Heating and cooling are the kind of energy. The most important energy when considering the heating and cooling of a building is thermal energy. The correct option is A.
What is energy?Energy is the ability to do work.
The temperature of building is increased or decreased due to the season changes. This heating or cooling is a type of energy related to thermal.
Thus, the most important energy when considering the heating and cooling of a building is thermal energy. The correct option is A.
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A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.
Answer:
Usual speed: [tex]500\; {\rm km \cdot h^{-1}}[/tex].
Explanation:
Let the usual duration of the trip be [tex]t[/tex] hours ([tex]t > 0[/tex].) The actual duration of this trip would be [tex](t - (1/2))[/tex] hours.
The usual speed would be:
[tex]\begin{aligned}\frac{1500}{t}\end{aligned}[/tex].
The actual speed would be:
[tex]\begin{aligned}\frac{1500}{t - (1/2)}\end{aligned}[/tex].
The actual speed is [tex]100\; {\rm km \cdot h^{-1}}[/tex] greater than the usual speed. In other words:
[tex]\begin{aligned}\frac{1500}{t - (1/2)} - \frac{1500}{t} = 100\end{aligned}[/tex].
Simplify this equation and solve for [tex]t[/tex] ([tex]t > 0[/tex]):
[tex]\begin{aligned}\frac{15}{t - (1/2)} - \frac{15}{t} = 1\end{aligned}[/tex].
[tex]\begin{aligned}15\, t - 15\, \left(t - \frac{1}{2}\right) = t^{2} - \frac{1}{2}\, t\end{aligned}[/tex].
[tex]\begin{aligned}t^{2} - \frac{1}{2}\, t - \frac{15}{2} = 0\end{aligned}[/tex].
[tex]2\, t^{2} - t - 15 = 0[/tex].
[tex](2\, t + 5)\, (t - 3) = 0[/tex].
Since [tex]t > 0[/tex], the only possible value for [tex]t[/tex] would be [tex]t = 3[/tex].
Thus, the usual duration of this trip would be [tex]3\; {\rm h}[/tex]. The usual speed of this trip would be:
[tex]\begin{aligned}v &= \frac{s}{t} = \frac{1500\; {\rm km}}{3\; {\rm h}} = 500\; {\rm km \cdot h^{-1}}\end{aligned}[/tex].
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then...
Select one:
a. the pulley rope is pulled 1 meter.
b. the pulley rope is pulled more than 1 meter, but less than 3 meters.
c. the pulley rope is pulled 3 meters.
d. the pulley rope is pulled more than 3 meters.
Answer:
b
Explanation:
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then the pulley rope is pulled more than 1 meter, but less than 3 meters.
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then. The correct answer is a. the pulley rope is pulled 1 meter.
When lifting a piano using a pulley system, the distance the pulley rope is pulled will be the same as the distance the piano is lifted. This is due to the mechanical advantage of the pulley, which reduces the amount of effort needed to lift the piano but does not change the distance the rope is pulled.
In a simple single fixed pulley system, where one end of the rope is attached to a fixed point and the other end is used to lift the piano, the distance the pulley rope is pulled will indeed be the same as the distance the piano is lifted.
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a body moves on to 120 km long track if he moves first 30 km with a speed of 30 km per hour then what is the speed for next 90 so that average speed becomes 60 km per hour
Answer:
90 km/hr
Explanation:
AVERAGE is 60 km/hr so 120 km / 60 km/hr = 2 hours total
first 30 km / 30 km / hr = 1 hour used 1 hour left
now there is 90 km to cover in the second hour
so that must be 90 km/hr
A body which is uniformly decelerated comes to rest in 5s after travelling of 10m. What is its initial velocity a distance
Answer:
4 m/s
Explanation:
v=u+ at and v^2=u^2+2as.
It is given that v=0,t=5 s and s=10 m.
⇒0=u+5a and 0=u^2+20a.
⇒a=−u/5 and a=−u^2/20.
⇒u/5 = u^2/20⇒u=4 m/s.
⇒ The initial velocity is 4 m/s.
At time t = 0 s, an object is moving to the right
with a velocity v that can be modeled by the
equation v=(4.2 m/s)-(1.4 m/s?)t. At what time,
if any, does the object change its direction of
motion?
This object should not change its direction of motion because despite its velocity it will be still moving to the right.
What does the equation describe?The equation describe the velocity of an object and how this velocity changes depending on time.
How is the direction of motion relate?The equation does not describe the direction of motion. Due to this, it is expected the direction is the same and does not change.
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1. Use the picture on page 3 of the lesson in Connexus to help you label each part of the wave below:
a.
b.
c.
d.
All the following are momentum oscillators except a. Relative Strength Index (RSI) b. Moving Average Convergence/Divergence (MACD) c. Stochastics d. Advance/Decline Line
All the following are momentum oscillators except Advance/Decline Line.
What are momentum oscillators?
Momentum oscillators measure the amount that a security's price has changed over a given period of time.
Examples of momentum oscillatorsRelative Strength Index (RSI) Moving Average Convergence/Divergence (MACD) StochasticsThus, all the following are momentum oscillators except Advance/Decline Line.
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if both the mass and velocity of a moving object are doubled, how will the objects momentum change
Answer:
The momentum will quadruple
Explanation:
Original momentum
momen = mv
now increase both
momen = 2m * 2v = 4 mv <====== the momentum has quadrupled
A temperature inversion prevents the ____ currents that would carry pollutants up into the atmosphere
Answer:
convection
Explanation:
would you consider caffeine to be more or less toxic then arsenic explain
What causes trash islands to form
Answers:
Suface winds
Tropical storms
Ocean currents
Answer:
ocean currents
Explanation:
In the circuit shown in Fig. E26.17, the voltage across the 2.00 Ω resistor is 12.0 V. What are the emf of the battery and the current through the 6.00 Ω resistor?
The emf of the battery of the given circuit is 18 volts and the current through the 6 ohm resistor is 3A.
What is ohm's law?In a current carrying conductor, the voltage difference V is directly proportional to the current I through the conductor. The constant is called the resistance R.
i.e V=IR.
Emf of the battery is equal to e = V1 +V2
Current through 2 ohm resistor, I2 = V2 /R
I2 = 12/2
I2 =6 A
Voltage through 1 ohm resistor V1 = I1 R
V1 = 6 x 1 =6 volts
Emf of the battery E = 6+12 =18 volts.
The current through 6 ohm resistor is
I = 18 /6 = 3 A
Thus, emf of the battery is 18 volts and the current through the 6 ohm resistor is 3A.
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1.
Why does a balloon rubbed on your hair stick to the ceiling? What is this called? Why
does the balloon stay there?
Answer:
Static Electricity.
Explanation:
The rubbing of hair (object) onto the balloon creates a negative charge that is carried by electrons, the electrons will soon build higher to create static electricity, thus keeping it onto the ceiling.
Hope this helps!
what do you know in climate change?
Climate change is the reason for a lot of factors such as:
Heat-trapping Greenhouse Gases And The Earth's Climate
Greenhouse Gases
Reflectivity or Absorption of the Sun's Energy
Changes in the Earth's Orbit and Rotation
Variations in Solar Activity
Changes in the Earth's Reflectivity
Volcanic Activity
There's a lot more that I could list, but hopefully this will do.
Which statements must be true about the two congruent, shaded figures? select two options. the figures are rectangles because they are formed inside a rectangle. the figures are rhombi because they are formed by four congruent line segments. the figures are trapezoids because each has exactly one pair of parallel sides. the figures are parallelograms because their opposite sides are parallel. the figures are quadrilaterals because each has four sides.
The true statements about the two congruent, shaded figures are:
D. The figures are parallelograms because their opposite sides are parallelE. The figures are quadrilaterals because each had four sidesWhat is Congruence?This refers to the name that is given if two figures or objects have the same shape and size.
Hence, we can see from the complete text that four parallel lines are drawn in a rectangular sign and painted using two colors in an alternating pattern, then they are parallelograms because their opposites are parallel.
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. Define density. How can you calculate density of an irregular shape solid body.
Answer:
a measure of the amount of information on a storage medium
Density= mass
volume
it symbol is roh
Explanation:
To find density
we need the mass and volume we have to devide both of the
what do a class 1 lever and a class 2 lever have in common?
a)both levers place the fulcrum in between the applied force and the object being lifted.
b)both levers would lift an object on the same side of the fulcrum as the applied force
c)both levers have an output force in the same direction as the input force.
d)both levers result in a larger output force from a smaller input force.
The similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.
What is a lever?A lever is a rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied.
A lever has three classes based on the position of the fulcrum as follows:
Class 1 has the fulcrum placed between the effort and load Class 2 has the load between the effort and the fulcrumClass 3 has the effort between the load and the fulcrumTherefore, the similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.
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When cell a sends a message to
cell b, ? occurs at cell
b.
a. osmosis
b. active transport
c. synaptic transmission
Answer:
c. Synaptic transmission
Explanation:
To transmit impulses/electronic signals around the body, nerve cells transfer messages across the synapse and the movement of the chemicals from one cell to the other is known as either diffusion or synaptic transmission.
A crowbar moves a distance of .35 meter to lift a load .05 meters off the ground.
what is the ideal mechanical advantage of the crowbar?
The ideal mechanical advantage of the crowbar will be 0.7.IMA is also equal to the distance traveled by the load divided by the distance traveled by the effort.
What is ideal mechanical advantage?The ideal mechanical advantage of a lever is equal to the length of the effort arm divided by the length of the resistance arm.
The ideal mechanical advantage is found as;
[tex]\rm IMA=\frac{0.35}{0.5} \\\\ IMA=0.7[/tex]
Hence,the ideal mechanical advantage of the crowbar will be 0.7.
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Exercises
Question-5 (doable)
A magnified, inverted image is located a distance of 38.0 cm from a converging lens with a focal
length of 10.0 cm. Determine the object distance and tell whether the image is real or virtual
[ 13.6 cm )
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{1}{-10}+\dfrac{1}{38}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-19+5}{190}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-14}{190}[/tex]
[tex]\\ \rm\Rrightarrow u=\dfrac{190}{-14}[/tex]
[tex]\\ \rm\Rrightarrow u=13.6cm[/tex]
Real
[tex] \large\textbf{Question } [/tex]~
[tex] \textsf{How many images will be formed when two plane } [/tex][tex] \textsf{mirrors are inclined on each other by an angle of 60° ?} [/tex]
[tex] \texttt{[ Need explanation ]} [/tex]
[tex] \bold{\underline{\underline{\underbrace{Answer}}}} [/tex]
5 images
Explanation:
⠀
⠀
⠀⠀⠀⠀▦ NoteWhat is reflection of light?
The reflection of light is the phenomenon in which the rays of light falls on the object and change it's path.
⠀
How image is formed in plane mirror?
When you look at the mirror the image is formed behind the mirror and it is virtual. The light from the object which reaches the mirror gets reflected back.
⠀
⠀
⠀⠀⠀⠀SolutionThe formula to find the no. of images between the 2 plane mirror at any angle θ.
[tex] \sf No. \: of \: images = \frac{360 \degree}{ \theta} - 1[/tex]
According to the question the plane mirror is inclined at 60° angle.
Substituting the required values.
[tex] \sf \large \frac{ \cancel{360} \small \: \: 6}{ \cancel{60}} - 1 \\ \\ \sf \large 6 - 1 \\ \\ \boxed{ \frak{ \implies 5} }[/tex]
The 2 plane mirror will form 5 images inclined at 60° angle.
A student measured the length of a wire four times using a meter rule and obtained the following readings: 18.6cm, 18.5cm 18.6cm and 18.5cm. Determine the length the student should record.
The length the student should record as correct is 18.55 centimeters (cm) because it is the average value.
What is the average value?The average value is a number associated with the middle amount for a given number of measured samples.
In this case, the median value results less useful to describe a set of data when compared to the average.
In conclusion, the length the student should record as correct is 18.55 centimeters (cm) because it is the average value.
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Which physical activity would an augmented reality resource help you with? Diving High jumping Walking Weight lifting
Answer:
Keeping up your healthy lifestyle also means keeping up exercising. Exercise helps control your weight. It helps maintain it, or helps you loose weight. Even though having a healthy lifestyle, exercise also helps battle the chance of getting diseases and other illnesses. Exercise can help improve your energy level, as well as making sure you get the right amount of sleep. And besides all these, exercise can make you feel great in general, and help improve your overall mood.
Explanation:
Answer:
Diving, as it's not as accessible as the others.
Explanation:
What is the best definition
of the atomic number?
A. the number of protons found in the nucleus
B. the number of protons found outside the
nucleus
C. the number of neutrons found in the nucleus
a is the correct answer
Explanation:
no.of proton defines atomic number in an atom
Answer: a
Explanation:
An atomic number is the number of protons found in the nucleus. The number of protons is equal to the number of electrons. The atomic mass the atomic number add the amount of neutrons.
at constant temperature and pressure, gas volume is directly proportional to the
Answer:
number of moles of gas.
Explanation:
Which of the following statements are true about gravity?
Check all that apply.
O A. Gravity doesn't exist between the Earth and the sun.
B. Gravity exists in the whole universe.
C. Gravity is a force that pushes two or more objects apart.
D. Gravity exists between two or more objects that have mass.
Answer:
B and D
Explanation:
A is wrong because objects with mass have gravity and the Earth and Sun both have mass. As we know, the Earth orbits around the Sun and the reason si because gravity.
B is corrects because throughout the whole universe there are objects like planets and meteors and more. All these objects have gravity because they have mass.
C Gravity pulls things together that is why we are on Earth and not pushed away into space.
D is correct, using Sun and a meteor. When a meteor comes within the gravity range of the sun, the sun pulls the meteor toward it. Without anything around the sun, nothing happens because there is nothing to pull.
1. A material through which a wave travels
A.) Velocity
B.) Increases
C.) Decreases
D.) speed
E.) medium
Answer:
Medium
Explanation:
I took a test on this last semester.
In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in". Explain what is actually happening to the flow of heat in this scenario.
When the window is closed the heat is trapped inside the classroom which is circulating around the room but when the window is opened, the heat is escaping so most of the heat is escaping rather than circulating the room.
In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in" because of the thermal gradient present between the outside colds air and the warm air present inside the room, as the window gets closed the outside air would not able to extract the thermal energy of the warm air present inside the room.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
Thermal energy can be produced with help of various means such as by burning fossil fuels, with the help of solar energy.
As given in the problem statement In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in because when the window is closed the cold air from the outside would not be able to extract the heat from the warmed air present inside the room
Thus, the flow of heat would get obstructed by the closing of the window
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How much force is needed to accelerate a 100 kg car at a rate of 3 m/s
In a tug of war, team A is pulling the rope with a force of 60N towards the right and team B also applies 60N towards the left, what is the net force?
Answer:
[tex]f_n_e_t=0[/tex]
Explanation:
[tex]f_1+f_2=f_n_e_t[/tex]
because there are two different forces in different directions (left: negative, right: positive, down: negative, up: positive) so 60N left will be negative, and 60N right will be positive:
[tex]60+(-60)=0[/tex]
when two same forces apllied then the net force is zero.
