Answer:
at max height you potential energy is highest
Explanation
At your maximum height, your potential energy is highest.
And at your exact peak, your kinetic energy is zero, which is the lowest it can ever be.
If two vectors a equals to 4 metre per second and b is equals to 7 metre per second be inclined at an angle of 60 degree to each other then determine the direction and magnitude of the resultant
Answer:
Explanation:
a = 4m/s
b = 7m/s
R = ?
R = sq. 4*2 + 7*2 + 2 x 4 x 7 x cos60
R = sq 93
direction is the angle which is already given in question.
what goes up but never comes down i know the answer but do you?
Answer:
Our Age :(
Explanation:
we will always age
A transformer has 500 turns of the primary winding and 10 turns of the secondary winding. a) Determine the secondary voltage if the secondary circuit is open and the primary voltage is 120 V
Answer:
First we use the fact that the ratio of the voltage on the secondary and on the primary will be the same as the ratio of the number of turns of both coils,
u=u^2/U^1 = N^2/N^1
we evaluate the unkown secondary voltage
u^ 2=N^2/N^1 u1
We substitute the given values -
u^2= 10/500 * 120v = 2.4v
Hence, the answer is 2.4v.
give relation between potential work and time
Relation between work done and potential is a change in the potential energy associated with the force. The negative sign provides the convention that work done against a force field increases potential energy, while work done by the force field decreases potential energy.
An apple dropped from the branch of a tree hits the ground in 0.5 s. If the acceleration of the apple during its motion is 10 ms-2 in the downward direction. Calculate ----- Its speed just before it hits the ground. What is its average velocity during 0.5 s? Calculate the height of the branch of the tree from the ground?
Given that,
Time = 0.5 s
Acceleration = 10 m/s²
(I). We need to calculate the speed of apple
Using equation of motion
[tex]v=u+at[/tex]
Where, v = speed
u = initial speed
a = acceleration
t = time
Put the value into the formula
[tex]v=0+10\times0.5[/tex]
[tex]v=5\ m/s[/tex]
(III). We need to calculate the height of the branch of the tree from the ground
Using equation of motion
[tex]s=ut+\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]s=0+\dfrac{1}{2}\times10\times(0.5)^2[/tex]
[tex]s=1.25\ m[/tex]
(II). We need to calculate the average velocity during 0.5 sec
Using formula of average velocity
[tex]v_{avg}=\dfrac{\Delta x}{\Delta t}[/tex]
[tex]v_{avg}=\dfrac{x_{f}-x_{i}}{t_{f}-t_{0}}[/tex]
Where, [tex]x_{f}[/tex]= final position
[tex]x_{i}[/tex] = initial position
Put the value into the formula
[tex]v_{avg}=\dfrac{1.25+0}{0.5}[/tex]
[tex]v_{avg}=2.5\ m/s[/tex]
Hence, (I). The speed of apple is 5 m/s.
(II). The average velocity during 0.5 sec is 2.5 m/s
(III). The height of the branch of the tree from the ground is 1.25 m.
A boat takes 4 hours for travelling downstream from point A to point B and coming back to point A upstream. If the velocity of the stream is 2 Kmph and the speed of the boat in still water is 4 kmph, whit is the distance between A and B
Answer:
d = 6 km
Explanation:
In this case we have the relative speed of the boot changes, suppose that the boat and the river have the same direction when the boat goes from A to point B
vbr = vrt + vbt
vbr = 2 + 4
vbr = 6 km / h
v₁ = 6 km / h
velocity is constant
v₁ = d / t₁
t₁ = d / v₁
when the boat returns to the starting point the speed is both opposite
vbr = vbt - vrt
vbr = 4-2
vbr = 2 km / h
v₂ = 2 km / h
as the speed is constant
t₂ = d / v₂
they also indicate that the total time is 4 h
t₁ + t₂ = 4
we substitute
4 = d / v₁ + d / v₂
4 = d (1 / v₁ + 1 / v₂)
d = 4 / (1 / v₁ + 1 / v₂)
let's calculate
d = 4 / (1/6 + 1/2)
d = 4 / 0.6666 67
d = 6 km
Why a flying areoplane has more kinectic energy than a flying insect
Answer: Because the angle of attack is so high, a lot of momentum is transferred downward into the flow. These two features create a large amount of lift force as well as some additional drag.
Brainlest would be much appreciated.
What does Force Components mean?
a zebra starts from rest and accelerates at 1.9 m/s2 what will be the acceleration after 5 seconds
Answer:
d = 23.75 m
The zebra has gone 23.75m after 5 seconds.
Corrected question;
A zebra starts from rest and accelerates at 1.9 m/s2. How far has the zebra gone after 5 seconds.
Explanation:
From the equation of motion;
d = vt + 0.5at^2 .........1
Where;
d = displacement
v = initial velocity = 0
t = time taken= 5 seconds
a = acceleration = 1.9 m/s^2
Substituting the given values into equation 1;
d = 0(5) + 0.5(1.9×5^2)
d = 0.5(1.9×5^2)
d = 23.75 m
The zebra has gone 23.75m after 5 seconds.
Which phrase best describes the time period in which the current body of scientific knowledge was developed? A. Just over the last 50 years B. Throughout all of history C. Mostly in the 20th century D. Mostly during Roman times
Answer:
The correct option is;
B. Throughout all of history
Explanation:
A body of knowledge comprises of a given collection of concepts, activities and terms that represents a professional discipline that is outlined by the associated scholarly society, therefore, scientific knowledge, being comprised of very diverse field of knowledge, with different approaches and changing understanding is taking as a process of learning about the universe data collection, experimenting analysis and communication with a theme of systems, equilibrium, models and constant change which makes the basis of the body of scientific knowledge to be throughout all of history.
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Explain why convex mirrors can only produce virtual images.
Answer:
Convex mirrors always produce virtual images because the reflected ray appears to "DIVERGE" while passing through the mirror and the diverged ray forms behind the mirror and is upright. Those images which are formed behind the mirror and are upright or inverted are said to be "VIRTUAL IMAGES".
what are the fundamental units used in physics?
Answer:
Metre, kilogram, second, ampere, kelvin, candela, and mole
Explanation:
A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity
If a light ray is traveling from air into a glass prism, how will the direction of the light ray change after it enters the prism? A. The light ray will be refracted toward the normal. B. The light ray will be refracted away from the normal. C. The light ray will be refracted perpendicular to the normal. D. The light ray will be refracted along the normal. E. The light ray will not be refracted.
the light ray will be refracted towards the normal.
To which category does galaxy #4 belong? Why does it belong in this category?
Answer:
The Galaxy IV satellite belongs to the HS-601 model category. It was engineered by Hughes Space and Communications Company (HSC)
Explanation:
The Galaxy IV belong in this category because it is a communications satellite. It was built for direct television broadcasting, for private business networks and mobile communications.
Cheers!
define hardware.Give 2 examples
Answer:
They are the physical parts of a computer.
examples :monitor,keyboard,system unit and mouse.
An electric current always produces a magnetic field that is ______ to the field. A. perpendicular B. parallel C. at a 37° angle D. none of the above
Answer:perpendicular
Explanation:
The electric current always generated the magnetic field that should be perpendicular to the field.
Relationship of electric current and magnetic field:In the case when the work should be compassed when the pointing is to be done along with the magnetic field lines so this represent that there should be the magnetic field that should be near the wire via the current should be flowing. here the magnetic field generated by the electric current should always be perpendicular to the current flow direction.
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The ratio of xi to xo for a certain mirror is 2.5. Which is true of an image produced by this mirror?
It is 2.5 times larger and virtual.
It is 2.5 times larger and real.
It is 2.5 times smaller and virtual.
It is 2.5 times larger and real.
The true of an image produced by this mirror will be 2.5 times smaller and virtual. Option C is correct.
What is the image?When light beams from an object reflect off a mirror, they intersect with the picture of that thing called an image. Real and virtual images are the two sorts of images.
The ratio of xi to xo for a certain mirror is 2.5;
[tex]\rm \frac{x_i}{x_0} =2.5 \\\ x_i=2.5 x_0[/tex]
Where,
[tex]\rm x_0[/tex] is the true of an image produced by this mirror.
The true of an image produced by this mirror will be 2.5 times smaller and virtual.
Hence,option C is correct.
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A plane mirror is useful for seeing:
They are used to see round dangerous bends
Which element is a metalloid? selenium (Se) polonium (Po) phosphorus (P) iodine (I)
Answer:
Polonium(Po)
Explanation:
Answer:
B. polonium (Po)
Explanation:
i took the test
Austin kicks a soccer ball with an initial velocity of 18.0 m/s at an angle of 35.0°. What are the horizontal and vertical components of the initial velocity? Round your answers to the nearest tenth. vix = m/s viy = m/s
Answer:
(vix, viy) = (14.7 m/s, 10.3 m/s)
Explanation:
The velocities of interest are ...
(vix, viy) = (vi)(cos(35°), sin(35°)) = (18 m/s)(cos(35°), sin(35°))
(vix, viy) = (14.7 m/s, 10.3 m/s)
Answer:
First one = 14.7
Second one = 10.3
Explanation:
EDGE
All matter is made up of________ called atoms or molecules
Please Help!!!!
A helicopter flies with an airspeed of 42.5 m/s [W]. If the wind is traveling with a velocity of 25.0 m/s [E30°S] relative to the ground then determine the velocity of the helicopter relative to the ground.
a) Use the data from the question to determine the velocity components for the helicopter’s speed relative to the air and the wind’s speed relative to the ground.
b) Use your velocity components from part (a) and determine the resultant velocity for each component. (In other words, determine the resultant horizontal component for the helicopter’s ground speed and the resultant vertical component for the helicopter’s ground speed).
c) Using your data, determine the resultant velocity of the helicopter relative to the ground.
Answer:
a) The vertical component of the helicopters speed relative to the air = 0 m/s
The horizontal component of the helicopters speed relative to the air = -42.5 m/s
The vertical component of the wind speed relative to the ground = -21.65 m/s
The horizontal component of the wind speed relative to the ground = 12.5 m/s
b) The x-component of the helicopter speed relative to the wind speed = -30 m/s
The y-component of the helicopter speed relative to the wind speed = -12.5 m/s
c) The resultant speed of the helicopter relative to the ground is 32.5 m/s in the direction of W 22.6° S
Explanation:
The speed of the helicopter = 42.5 m/s
The direction of flight of the helicopter = West
The wind speed = 25.0 m/s
The direction of the wind = E30°S
a) The velocity components of the helicopters speed relative to the air are;
Vertical component = 0 m/s
Horizontal component = -42.5 m/s
The velocity components of the wind speed relative to the ground are;
Vertical component = -25 × cos(30) = -21.65 m/s
Horizontal component = 25 × sin(30) = 12.5 m/s
b) To find the speed of the helicopter relative to the wind we have;
x-component of the helicopter speed = -42.5 m/s
y-component of the helicopter speed = -0
x-component of the wind speed relative to the ground = 25×sin(30) = 12.5 m/s
y-component of the wind speed relative to the ground = -25×cos(30) = -21.65 m/s
Therefore, the x-component of the helicopter speed relative to the wind speed = -42.5 + 12.5= -30 m/s
the y-component of the helicopter speed relative to the wind speed = 0 + (-12.5) = -12.5 m/s
c) The resultant speed of the helicopter relative to the ground is given by the relation;
[tex]v_{h, ground} =\sqrt{(v_{h,horizontal})^2 + (v_{h,vertical})^2}[/tex]
= √((-30)² + (-12.5)²) =32.5 m/s
The direction of motion from the x-axis is given as follows;
[tex]tan(x) = \dfrac{Vertical \ velocity \ component}{Horizontal \ velocity \ component} = \dfrac{-12.5}{-30} = \dfrac{5}{12}[/tex]
[tex]x = tan^{-1} \left (\dfrac{5}{12} \right ) = 22.62 ^{\circ}[/tex]
Therefore, the helicopter is flying at 32.5 m/s in the direction of W 22.6° S.
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A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball.
Answer:
The ball will be attracted to the negatively charged plate. It'll touch and pick up some electrons from the plate so that the ball becomes negatively charged. Immediately the ball is repelled by the negative plate and is attracted to the positive plate. The ball gives up electrons to the positive plate so that it is positively charged and suddenly attracts to the negative plate again, flies over to it and picks up enough electrons to be repulsed by negative plate and again to the positive plate and that continues.
The behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
The positive ball would go toward the negatively charged plate first. After which, it would lose the positive charge and becomes negatively charged. Due to the negative charge, it will repel the negatively charged plate and will start traveling towards the positive plate this time.
The process would continue which will create a pendulum kind of motion for the charged light metal ball between the plates, and this will continue until either of the one the positive or the negative plate became neutral (discharged).
Hence, the behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
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A box is pulled to the right with a force of 65 N at an angle of 58 degrees to the horizontal. The surface is frictionless. The free body diagram is shown.What is the net force in the x-direction?
Answer: 34.4N
Explanation:
Given the following :
Applied force (F) = 65N
Angle of inclination (Θ) = 58°
g = acceleration due to gravity = 9.8m/s^2
Therefore, net force in the x-direction is given has;
The horizontal component of force;
Fx = mgCosΘ
Fhorizontal = mass × acceleration due to gravity × cosΘ
mass × acceleration due to gravity = 65N
Fx = 65N × Cos58°
Fx = 65 × 0.5299192
Fx = 34.44N
Which best describes the importance of mitosis to living organisms? genetic variation and growth growth and development development and sexual reproduction sexual reproduction and genetic variation
Answer:
b.
Explanation:
Mitosis is important for growth and development of living organisms.
The major importance of mitosis is growth and development. The correct option is B.
What is mitosis?Mitosis is the method by which a cell replicates as well as then segregates its chromosomes, and generates two identical nuclei in order to divide.
Mitosis is basically followed by the equal division of the cell's contents into two daughter cells with identical genomes.
Mitosis occurs in the following stages:
The chromosomes shorten a s well as thicken during the phase called as prophase.Metaphase - Chromosomes align in the equator of the cell. Chromatids separate at the centromere as well as move to opposite poles during anaphase. Telophase - The generation of two nuclei after nuclear envelopes reform around each chromosome group.One cell divides once during mitosis to form two identical cells. Mitosis is primarily responsible for cell growth and replacement.
Thus, the correct option is B.
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3. Ultraviolet can kill these.
8words and 2nd letter starts with an A
Answer:
Bacteria
Explanation:
UV kills bacteria and its 8 letters
You can make a smoothie in a blender with a power of 400 watts and an efficiency of 85 percent. How much energy is actually being used to make the smoothie in 30 seconds?
A) 8600 J
B) 3000 J
C) 6580 J
D) 10,200 J
Answer:
Its D
Explanation:
I got help from another user lol
Answer:
D!!!
Explanation:
I had this question on my assignment and got it right!
A gardener uses 2700 J of work to push a wheelbarrow for 60 seconds. How much power does she use?
Answer:
I think 90 w I am not sure but I think it is right
I hope it is helpful for u
Answer:
45 WSolution,
Work(W)=2700 Joule
Time(t)=60 Seconds
Power=?
Now,
[tex]power = \frac{work \: done}{time \: taken} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{2700}{60} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 45 \: \: watt[/tex]
hope this helps..
Good luck on your assignment..
Which of the following describes sound waves
A. Waves that do not require a medium and in which the vibrations are parallel to the motion of the sound
B. Waves that require a medium and in which the vibrations are perpendicular to the motion of the sound
C. Waves that do not require a medium and in which the vibrations are perpendicular to the motion of the sound
D. Waves that require a medium and in which the vibrations are parallel to the motion of the sound
Answer:
your answer would be D because the waves results from back n forth vibrations of the particles of the medium throught which the sound waves is moving .
A sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.
A wave is form of disturbance that transfers energy form one point to another.
There are two types of waves; mechanical wave and electromagnetic wave.
Electromagnetic wave does not require material medium for its propagation.Mechanical wave requires material medium for their propagation.An example of mechanical wave include;
Sound wave is an example of mechanical wave because it requires material medium for its propagation.Sound wave is a also longitudinal type of wave because its vibration occurs parallel to the motion of the sound wave.Thus, we can conclude that a sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.
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explain how sound waves are produced
Answer:
Sound gets produced when something makes noise, which in turn creates what's called a pressure wave. Then, the pressure wave causes the surrounding particles to vibrate. As those particles vibrate, they make other particles vibrate too, pushing the sound forward through the sound medium. Hope this helps!
Explanation:
