Answer:
hmm let's see
Explanation:
ok, ill use the second equation of motion, u see its quite simple
recall that
average velocity= u+v/2
now think of that v like a box you can can call it velocity lol obviously its velocity
now remember the first equation of motion which is
v=u+at now this is inside the box, now you have to replace the v with it
then it becomes u+u+at/2
now u notice there are two initial velocity u know what to do with that
now it becomes
2u + at/2 now since the numerator applies to both then you can simplify it like this
2u/2+at/2
all the same the pont im trying to make is that you can use imaginative ways to mater derivation you can also reverse it if you don't unferstand you can drop your number
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.
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.
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
2. A wave on a rope has a wavelength of 2.0 m and a frequency of 2.0 Hz. What is the speed of the
wave?
step# 1
step#2
step#3
Answer:
4 m/s or 4 meters per second.
Explanation:
In order to calculate the speed of wave, you multiply the wavelength in meters and the frequency of the Wave in Hertz. 2 times 2 equals 4. The wave speed is always in m/s considering that the wavelength is also in meters.
Most of the elements in the periodic table are___
Answer:
The most of the elements in the periodic table are metals. The elements cannot be gases and liquids (Molecules are mainly gases and liquids). Metalloids are few. Examples (Germanium, Arsenic)
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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what goes up but never comes down i know the answer but do you?
Answer:
Our Age :(
Explanation:
we will always age
A plane mirror is useful for seeing:
They are used to see round dangerous bends
Calculate the period of time, in seconds, during which the 600 J is provided to the 30 W light bulb.
Answer:
[tex]t=20\:sec[/tex]
Explanation:
[tex]1 \:Watt\:=\:\frac{1\:Joule}{sec}\\\\sec\:=\:\frac{No.\:of\:Joules}{No.\:of\:Watts}\\\\t=\frac{600}{30}\\\\t=20\:sec[/tex]
Best Regards!
The period of time would be 20 seconds during which the 600 Joules is provided to the 30 Watts light bulb .
What is power ?The rate of doing work is known as power . The Si unit of power is the watt .
Power on light bulb = work done / time period in seconds
As given in the problem statement we have to find the period of time , in seconds , during which the 600 Joules is provided to the 30 Watts light bulb,
The Time period = The work done by the bulb / power used by the bulb .
= 600 Joules / 30 watts
= 20 seconds
Thus, the 600 Joules would be given to the 30 Watts light bulb during a 20 second period of time .
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Three positive charges A, B, and C, and a negative charge D are placed in a line as shown in the diagram. All four charges are of equal magnitude. The distances between A and B, B and C, and C and D are equal.
a. Which charge experiences the greatest net force? Which charge experiences the smallest net force?
b. Find the ratio of the greatest to the smallest net force.
Answer:
charge C = greatest net force
charge B = the smallest net force
ratio = 9 : 1
Explanation:
we know that in Electrostatic Forces, when 2 charges are at same sign then they repel each other and if they are different signed charges then they attract each other
so as per Coulomb's formula of Electrostatic Forces
F = [tex]\frac{k\ q_1\ q_2}{r^2}[/tex] .....................1
and here k is 9 × [tex]10^9[/tex] N.m²/c² and we consider each charge at distance d
so two charge force at A to B is
F1 = [tex]\frac{k\ q^2}{d^2}[/tex]
and force between charges at A to C, at 2d distance
F1 = [tex]\frac{k\ q^2}{(2d)^2}[/tex] = [tex]\frac{k\ q^2}{4d^2}[/tex]
force between charges at A to D, 3d distance
F1 = [tex]\frac{k\ q^2}{(3d)^2}[/tex] = [tex]\frac{k\ q^2}{9d^2}[/tex]
so
Charge a It receives force to the left from b and c and to the right from d
so at a will be
F(a) = -F1 - F2 + F3 ....................2
put here value
F(a) = [tex]-\frac{k\ Q^2}{d^2}-\frac{k\ Q^2}{4d^2}+\frac{k\ Q^2}{9d^2}[/tex]
solve it
F(a) = [tex]\frac{k\ q^2}{d^2}(-1-\frac{1}{4}+\frac{1}{9})[/tex]
F(a) = [tex]-\frac{41}{36}\ F1[/tex] = 1.13 F1
and
Charge b It receives force to the right from a and d and to the left from c
F(b) = F1 - F1 + F2 ....................3
F(b) = [tex]\frac{k\ q^2}{d^2}-\frac{k\ q^2}{d^2}+\frac{k\ q^2}{4d^2}[/tex]
F(b) = [tex]\frac{1}{4} \ F1[/tex] = 0.25 F1
and
Charge c It receives forces to the right from all charges.
F(c) = F2 + F 1 + F 1 ....................4
F(c) = [tex]\frac{k\ q^2}{4d^2}+\frac{k\ q^2}{d^2}+\frac{k\ q^2}{d^2}[/tex]
F(c) = [tex]\frac{9}{4} \ F1[/tex] = 2.25 F1
and
Charge d It receives forces to the left from all charges
F(d) = - F3 - F2 -F 1 ....................5
F(d) = [tex]-\frac{k\ q^2}{9d^2}-\frac{k\ q^2}{4d^2}-\frac{k\ q^2}{d^2}[/tex]
so
F(d) = [tex]-\frac{49}{36} \ F1[/tex] = 1.36 F1
and
now we get here ratio of the greatest to the smallest net force that is
ratio = [tex]\frac{2.25}{0.25}[/tex]
ratio = 9 : 1
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
Nabil wants to work out the density of a pebble. he has a displacement can and a beaker. What other piece of equipment will he need
Answer:
1) Measuring cylinder
2) Top Pan Balance
Explanation:
To find the density of the pebble Nabil should first accurately measure the mass of the pebble using the top pan balance
He should then fill the displacement can till the water reaches the outlet pipe at the to of the cylinder
He should then place the pebble into the cylinder carefully ans allow the water that would start coming out to stop
The volume of water in the displaced cylinder is then measured and the density is found by dividing the mass of the pebble by the volume of water in the measuring cylinder
[tex]Density \ of \ pebble = \dfrac{Pebble \ mass}{Volume \ of \ water \ in\ the \ measuring \ cylinder} = \dfrac{Pebble \ mass}{Water \ volume \ displaced}[/tex]
I NEED HELP PLEASE, THANKS!
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".
A right triangle ABC has sides /AB/ =9cm, /BC/=12cm find /AC/ and angles ACB and ABC if angle BAC= 90°
fdi9bn 08989089089008i uuuuuuri9ij
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 block of mass m is placed on a smooth wedge of inclination θ . The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block has a magnitude: (A) mg tan θ (B) mg sin θ (C) mg cos θ (D) mg sec θ
Answer: mg/Cosθ
Explanation:
Taking horizontal acceleration of wedge as 'a'
FCosΘ = FsinΘ
F = mass(m) × acceleration(a) = ma
For horizontal resolution g = 0
Therefore,
Horizontal = Vertical
maCosΘ = mgSinΘ
aCosΘ = gSinΘ
a = gSinΘ/CosΘ
Recall from trigonometry :
SinΘ/Cosθ = tanΘ
Therefore,
a = gtanΘ
Normal force acing on the wedge:
mgCosΘ + maSinΘ - - - - (y)
Substitute a = gtanΘ into (y)
mgCosΘ + mgtanΘsinΘ
tanΘ = sinΘ/cosΘ
mgCosΘ + mgsinΘ/cosΘsinΘ
mgCosΘ + mgsin^2Θ/cosΘ
Factorizing
mg(Cosθ + sin^2Θ/cosΘ)
Taking the L. C. M
mg[(Cos^2θ + sin^2Θ) /Cosθ]
Recall: Cos^2θ + sin^2Θ = 1
mg[ 1 /Cosθ]
mg/Cosθ
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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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
A hammer exerts 49.8 N of force on the head (r=0.00510 m) of a nail. How much pressure does it exert on the nail?
Answer:
609547.12 Pa ≈ 6.10×10^5 Pa
Explanation:
Step 1:
Data obtained from the question. This include the following:
Force (F) = 49.8 N
Radius (r) = 0.00510 m
Pressure (P) =..?
Step 2:
Determination of the area of the head of the nail.
The head of a nail is circular in nature. Therefore, the area is given by:
Area (A) = πr²
With the above formula we can obtain the area as follow:
Radius (r) = 0.00510 m
Area (A) =?
A = πr²
A = π x (0.00510)²
A = 8.17×10^-5 m²
Therefore the area of the head of the nail is 8.17×10^-5 m²
Step 3:
Determination of the pressure exerted by the hammer.
This is illustrated below:
Force (F) = 49.8 N
Area (A) = 8.17×10^-5 m²
Pressure (P) =..?
Pressure (P) = Force (F) /Area (A)
P = F/A
P = 49.8/8.17×10^-5
P = 609547.12 N/m²
Now, we shall convert 609547.12 N/m² to Pa.
1 N/m² = 1 Pa
Therefore, 609547.12 N/m² = 609547.12 Pa.
Therefore, the pressure exerted by the hammer on the nail is 609547.12 Pa or 6.10×10^5 Pa
Answer:
609547.12
Explanation:
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:
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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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define hardware.Give 2 examples
Answer:
They are the physical parts of a computer.
examples :monitor,keyboard,system unit and mouse.
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
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.
Place the types of radiation in order of INCREASING mass.
Answer & explanation:
Gamma Radiation (γ): Also called gamma rays. Gamma radiation is made of electromagnetic waves, has zero charge and mass, continuously emits heat and has the ability to ionize air and make it conductive of electric current. Beta radiation (β): Beta rays or beta particles, are electrons, negative particles with charge - 1 and mass number 0.Alpha radiation (α): Also called alpha particles or alpha rays, are particles charged by two protons and two neutrons. They have positive charge +2 and mass number 4.Which factors are used to calculate the kinetic energy of an object? Check all that apply. gravity velocity volume mass heig
Answer:
mass , velocity
Explanation:
K.E= 1/2 X mv2
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.
Suppose you are jumping on a trampoline. At your maximum height, your potential energy is
(highest or lowest) and
is (highest or lowest).
your kinetic
energy
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.
All matter is made up of________ called atoms or molecules
