Answer:
The tuba is the biggest, and among the newest, of all the brass instruments. Tuba players create the low-pitched sound by making a kind of "buzz" with their breath against the mouthpiece and pressing the tuba's valves to form notes.
Explanation:
in other words it because less air molecules are abloe to go through the mouth peiece of the tuba
Need help ASAP
Thankss + BRAINLIST only for correct answers
1.Which of the following statements about light waves is true? check all correct answers
A.They come from sources across space
B.They travel in a straight line from their source
C.They can travel through any type of material
D.They can be reflected by some types of material
2.Transparent allows some light through
A.True
B.false
Answer:
A, B and D
2. A
Explanation:
1.Which of the following statements about light waves is true? check all correct answers
A.They come from sources across space reason is that a light can travels form its source and its moves across the space
B.They travel in a straight line from their source reason is that the type of light that undergo these is called parallel ray of light
C.They can travel through any type of material reason not all materials light can penetrate through e.g wall
D.They can be reflected by some types of material reason is that some materals reflect light rays e.g polished mirror
Which of these is NOT used to create a simple electromagnet?
Battery
Light bulb
Copper wire
battery
Explanation:
Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil
Answer:
Light Bulb
Explanation:
I did the quiz and i got it right
how can changing the kinetic energy of an object cause energy to be transferred to or from the object
Kinetic Energy. Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. For the blue ball to move to the position of the green ball, energy must be given to the blue ball.
Which wave property is related to how loud or soft a sound is?
Answer:Aplitude
Explanation:
a p e x
A body is at equilibrium under the action of three forces. One force is 10N acting due east and one is 5N in the direction 60° north east. What is the magnitude and direction of the third force?
Answer:
If the body is in equilibrium the two forces add up and the third is the opposite of the resultant.
F(1x)=F(1)=10 N
F(2x)=F(2)cos60=5•0.5=2.5 N
F(2y) =F(2)sin60 = 5•0.866= 4.33 N
F(3x) =- F(x)=- (10+2.5 )= -12.5 N
F(3y) =- F(2y)= - 4.33 N
F(3) = sqrt{ F(3x)²+F(3y)²} =13.23 N
tan φ = F(3y)/F(3x) =4.33/12.5=0.364
φ = 19.1⁰ (south-west)
Explanation:
Green light travels by what type of wave? (2 points) a Conductive b Electronic c Conducive d Electromagnetic 2
Answer:
Electromagnetic
Explanation:
Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.
The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.
Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.
The initial speed of a dropped ball is 0 m/s after 2 seconds the ball travels at a speed of 20 m/s what is the acceleration of the ball ?
Answer:
Please find attached file
Explanation:
The rate of change of velocity with respect to time is known as acceleration. The acceleration of the ball will be 10m/s.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.
The given data in the problem is given by ;
u is the initial speed of ball = 0 m/sec
v is the final speed of the ball= 10 m/sec
t is the time interval= 2 second
a is the acceleration of ball=? m/sec²
The formula for acceleration is;
[tex]\rm a=\frac{(v-u)}{t} \\\\ \rm a=\frac{(20-0)}{2} \\\\\rm a=10\ m/sec^2[/tex]
Hence the acceleration of the ball will be 10m/s².
To learn more about the acceleration refer to the link;
https://brainly.com/question/2437624
Which two organisms in the Domain Eukarya can make their own food?
Answer:
Plantae. Also called the Kingdom Metaphyta, the Kingdom Plantae consists of all multicellular, eukaryotic, and photosynthetic organisms on the planet. Being photosynthetic, these organisms are autotrophs and can make their food using the energy from the sun.
Can someone help me name the layers.
Answer:
A. Crust
B. Mantle
C. Outer Core
D. Inner Core
Explanation:
Answer:
A. Crust
B. mantle
C. outer core
D. inner core
Explanation:
because it is
A gas is put into a closed container. The container and the gas inside it are heated. What will happen to the pressure inside the container?
Answer:
Explanation:
Plug
In everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line.
Explain why.
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. ... In the absence of any forces, no force is required to keep an object moving.
Thankshope it helpsIn everyday situations, it does seem that a force is needed to keep an object moving at a constant speed in a straight line because the resistive frictional force acted on every objects against their motion.
What is friction?The resistance provided by surfaces in touch as they move past one another is known as friction.
According to Newton's first law of motion, Unless forced to change its condition by an outside force, every object will continue to be at rest or moving uniformly in a straight line.
But in everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line because of the frictional resistive force acting opposite to the motion. That's why, a force of equal magnitude and opposite direction must be applied on the object, so that, resultant force becomes zero. It can at a constant speed in a straight line.
Learn more about friction here:
https://brainly.com/question/13000653
#SPJ2
why is the time every 15° eastward one hour ahead?..
Explanation:
The reason time zones are 15 degrees wide is because there are 24 hours and 360/24 = 15. As you move east by 15 degrees the sun’s position in the sky changes relative to us and it looks an hour later in the day, so we advance our clocks to match the sun’s position.
So every 15° eastward one hour ahead.
Device that transforms thermal energy to mechanical energy
Answer:
the device that transfer thermal energy into to mechanical energy is heat engine.
hope it helps.
Explanation:
heat engine transforms thermal energy to mechanical energy
hope it is helpful to you
what is meant by the resultant force acting on an object?
Answer:
The resultant force is the single force that would produce the same effect on an object as two or more forces that are applied to the object. To find the resultant force, first draw a free body diagram, which is a diagram that shows all the applied forces using arrows in the direction of each force.
PLEASE HELP URGENT 10 points
Answer:
Both have the same amount. C.
Explanation:
Someone help me please I need to pass this quiz , this is the only quiz that It making me fail this class !!!
Select the correct items. Click the bottom right arrow to go to the next set . Click the checkmark ( Available on the last set ) to submit all your answers
Slow twitch muscle Fibers
Can contract repeatedly
Only anaerobic sources
Both aerobic & anaerobic
Produce most force
Endurance activities
Fast contraction speed
Fatigue quickly
Only aerobic sources
Speed, strength, power
Fast twitch Type lla muscle Fibers
Only aerobic sources
Fast contraction speed
Speed, strength, power
Only anaerobic sources
Fatigue quickly
Endurance activities
Produce most force
Can contract repeatedly
Both aerobic & anaerobic
Fast twitch type llx muscle Fibers
Can contract repeatedly
Only anaerobic sources
Only aerobic sources
Both aerobic & anaerobic
Fast contraction speed
Produce most force
Fatigue quickly
Endurance activities
Speed, strength, power
Answer:
1. Endurance activities
Only aerobic source
2. Can contract repeatedly
Speed strength and power.
Both aerobic and anaerobic sources
3. Fast contraction speed
Only anaerobic sources
Produce most force
Fatigue quickly
Speed, strength and power
Explanation:
I hope this helps. Although, I'm about 80% sure of the answer.
Electromagnetic waves are
O
A. forms of matter.
O
B. forms of space.
O
C. longitudinal waves.
O
D. transverse waves.
Giving 12 points for this question.
Which is NOT an example of work?
pushing a box across the floor
trying to push a rock that never moves
picking up a box off the floor
raising a barbell over your head
Answer:
trying to push a rock that never moves
Explanation:
let me try my best to break the concepts down for you.
the definition of work done is
work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force.
this means that when you apply a force, it must move.
basically it is like holding a book in your hands and not moving, are you fighting the gravitational force?
when you push a box, it definitely moves in the direction you push right?
when you raise the barbel, you are applying a upward force, and barbel us moving upwards, so work is done
hope it helps, if not please report it so that someone else gets to try it
A bottle of water with mass 0.9 kg is left out in the sun, the radiation from the sun warms up the water bottle. If the water bottle was initially 10°C and the sun provided 120,000 J of thermal energy, calculate the final temperature of the water. Use C = 4182 j/kgK for the specific heat of water.
Answer:
Final temperature, T2 = 314.9 Kelvin
Explanation:
Given the following data:
Mass = 0.9kg
Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K
Quantity of heat = 120,000 J
Specific heat capacity = 4182 j/kgK
To find the final temperature;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Making dt the subject of formula, we have;
[tex] dt = \frac {Q}{mc} [/tex]
Substituting into the equation, we have;
[tex] dt = \frac {120000}{0.9*4182} [/tex]
[tex] dt = \frac {120000}{3763.8} [/tex]
dt = 31.9K
Now, the final temperature T2 is;
But, dt = T2 - T1
T2 = dt + T1
T2 = 31.9 + 283
T2 = 314.9 Kelvin
A plane taxies onto the runway, preparing for take off. It starts at rest before it's engines start. The plane's top speed, before it takes off the ground, is about 8820 km/s. If the take off takes about 32.8s, what is the acceleration of the plane?
Answer:
Explanation:
This is a fast plane! At it's takeoff speed, it could fly around the world in 5 seconds!
Acceleration is defined as the change in speed over the change in time.
[tex]a = \frac{v_f - v_o}{t}[/tex]
Where v_f is the final velocity, v_o is the original velocity, and t is the time.
We know v_f = 8820km/s.
v_o = 0 km/s. The plane "starts at rest before it's engine start." So we know it starts from zero velocity.
t = 32.8 seconds.
You can solve the equation from there.
a plane travels 400km in 3 hours. what is its speed?
Alyssa is taking a walk on a nature path near her neighborhood. She
carries a compass with her. As she walks along the path, she notices
the needle on the compass is occasionally deflected from its original
position. If she has not changed the direction she is walking, what is
most likely causing the occasional shift in the needle? (1 point)
O Changes in pressure
0 Changes in temperature
O Sources of electrical current
O Changes to Earth's magnetic field
Answer:
C. Sources of electrical current!
Hope this helps :)
Answer:
Sources of electrical current
Explanation:
Got it right on the test.
Under constant acceleration, the average velocity of a particle is half the sum of its initial and final
velocities. Is this still true if the acceleration is not constant? Explain.
Answer:
It is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle is not constant
Explanation:
The motion of a particle under constant acceleration, 'a', is be given by the following kinematic equations;
v² = u² + 2·a·s
v = u + a·t
Where;
v = The final velocity of the particle
u = The initial velocity of the particle
a = The acceleration of the particle
s = The distance through which the particle travels
t = The time of motion of the particle
By simplifying the above equation, we have;
v² - u² = 2·a·s
(v² - u²)/(2·a) = s
(v - u) × (v + u)/(2 × a) = s
((v - u)/a) × ((v + u)/2) = s
From v = u + a·t, we have;
t = (v - u)/a
∴ ((v - u)/a) × ((v + u)/2) = t × ((v + u)/2) = s
∴ ((v + u)/2) = s/t
The average velocity = (Total distance traveled by the particle) ÷ (The time of travel of the particle)
∴ The average velocity = s/t = ((v + u)/2) = Half the sum of the initial and final velocity
However, it is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle, 'a', is not constant, as the velocity time graph is no longer a straight line graph and the distance traveled by the particle, 's', which is the area under the velocity time graph, 'A', (given by the sum of area of the triangle and the rectangle given by the area under straight line graph for constant velocity) cannot be given directly by the product of the time and the average velocity.
Explain the difference between objects that are sources of light and objects that reflect light
Answer:
sun is the main source while the other object reflect light on the sun
Explanation:
nasa libro yans
an electric heater draws a current of 5 ampere from 220 volt supply.Calculate
(a) its resistance
(b) electrical energy consumed in kwh if it is used for 4 hours
[tex] \bf \underline{Given :-}[/tex]
[tex] \sf{• \: An \: electric \: heater \: draws \: a \: current \: of \: 5 \: ampere \: from \: 220 \: volt \: supply.}[/tex]
[tex] \\ [/tex]
[tex]\bf{ \underline{To \: Find:- }}[/tex]
[tex] \sf• \: ( a) \: lts \: resistance.[/tex]
[tex] \sf• \: (b) \: electrical \: energy \: consumed \: in \: kwh \: if \: it \: is \: used \: for \: 4 \: hours.[/tex]
[tex] \\ [/tex]
[tex]\huge\bf{ \underline{ Solution :-}}[/tex]
[tex] { \boxed{\bf{(a)}}}[/tex]
[tex] \sf• \: Current \: (I) = 5 \: A[/tex]
[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]
[tex] \bf \red{\bigstar{\: Formula \: of \: Resistance \: (R) = \frac{V}{I} }}[/tex]
[tex] \sf \rightarrow R = \frac{220}{5} [/tex]
[tex] \sf \rightarrow R =44[/tex]
[tex] \bf{Hence, \: it's \: resistance \: is \: \: 44 \: Ω \: .}[/tex]
[tex] \\ \\ [/tex]
[tex] { \boxed{\bf{(b)}}}[/tex]
[tex] \sf• \: Current \: (I) = 5 \: A[/tex]
[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]
[tex] \bf \red{\bigstar{\: Formula \: of \: Electric \: Power \: (P) = IV }}[/tex]
[tex] \sf \rightarrow P = (5 \times 220) [/tex]
[tex] \sf \rightarrow P = 1100 \:[/tex]
[tex] \\ [/tex]
[tex] \sf \therefore \: P = 1100 \: watt[/tex]
[tex] \sf{• \: Time \: (t) = 4 \: hours }[/tex]
[tex] \bf \red{\bigstar{ \: Formula \: of \: Energy \: (W) = Pt}}[/tex]
[tex] \sf \rightarrow W= 1100 \times 4[/tex]
[tex] \sf \rightarrow W = 4400[/tex]
[tex] \sf \rightarrow W = \frac{4400}{1000} [/tex]
[tex] \sf \rightarrow W = 4.4[/tex]
[tex] \sf \therefore W = 4.4 \: kwh[/tex]
[tex] \bf{Hence, \: Electrical \: Energy \: is \: 4.4 \: kwh.}[/tex]
Answer is 4.4 kwh.
hope it helps you.
Two cars start moving from the same point on a rectilinear path at the same time, heading to the same destination 90 km away. The first travels at an average speed of 50 km/h and the second at 60 km/h. Deter- mine the time interval separating the arrival of the two cars to their destination.
Answer:
0.3 hour
Explanation:
From the question given above, the following data were obtained:
Distance travelled = 90 km
Speed of 1st car = 50 km/h
Speed of 2nd car = 60 km/h
Time interval separating the two cars =?
Next, we shall determine the time taken for each car to get to the destination. This can be obtained as follow:
For the 1st car:
Distance travelled (d) = 90 km
Speed of 1st car (S₁) = 50 km/h
Time (t₁) =?
Speed = Distance /time
S₁ = d/t₁
50 = 90 / t₁
Cross multiply
50 × t₁ = 90
Divide both side by 50
t₁ = 90 / 50
t₁ = 1.8 hours
For the 2nd car:
Distance travelled (d) = 90 km
Speed of 2nd car (S₂) = 60 km/h
Time (t₂) =?
Speed = Distance /time
S₂ = d/t₂
60 = 90 / t₂
Cross multiply
60 × t₂ = 90
Divide both side by 60
t₂ = 90 / 60
t₂ = 1.5 hours
Finally, we shall determine the time interval separating the arrival of the two cars. This can be obtained as follow:
Time for the 1st car (t₁) = 1.8 hours
Time for the 2nd (t₂) = 1.5 hours
Time interval separating the two cars (tₛ) =?
tₛ = t₁ – t₂
tₛ = 1.8 – 1.5
tₛ = 0.3 h
Thus, the interval separating the arrival of the two cars is 0.3 hour
Which refers to the chemical name of CO? carbon monoxide carbon oxide monocarbon monoxide monoxide carbon
Answer:
Carbon monoxide
Explanation:
Carbon refers to the "C" which stands for carbon. Monoxide refers to the single molecule of oxygen present in the substance.
Answer:
Carbon monoxide is the answer here
Explanation:
Two charges lie on the x-axis, one at the origin and the other at 14.3m What is the potential (relative to infinity) due to these charges at a point at 7.1m measured from the origin on the x-axis?
Answer:
V = 2.52 10³ V
Explanation:
The electric potential for a point charge is
V = k ∑ [tex]\frac{q_i}{r_i}[/tex]
In this case the formula is
V = k ([tex]\frac{q_1}{r_1} + \frac{q_2}{r_2}[/tex])
distances are the absolute value
r₁ =√ (7.1 -0)² = 7.1 m
r₁ =√ (7.1 - 14.3)² = 7.2 m
we substitute
V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)
we have two possibilities
* different charges
V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)
* equal charges and same sign
q₁ = q₂ = q
V = 9 10⁹ q (1 / 7.1 + 1 / 7.2) = p 9 10⁹ 0.2797
V = 2.52 10⁹ q
if we assume a value of the charge, for example q = 1 10⁻⁶ c
V = 2.52 10⁹ 1 10⁻⁶
V = 2.52 10³ V
What is the distance from one peak to the next peak called?
Answer:
wavelength
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data.
The distance from one peak to the next peak is called wavelength. This distance is also equal to the distance from one trough of a wave to another.
Mathematically, wavelength is calculated using this formula;
[tex] Wavelength = \frac {speed}{frequency} [/tex]