Explanation:
acceleration=∆v/∆t
∆v=5-0
∆t=10-0
a=5/10
a= 0.5m/s²
speed= distance/time
average speed =5+0/2
=5/2
=2.5m/s
speed=distance/time
5=d/10
d=10*5
=50m
I NEED HELP PLEASE, THANKS!
Identify each of the following as a conductors or insulators. Explain.
-cloth
-dry wood
-tap water
-glass
Answer:
Cloth:
It is an insulator since it can't let electricity pass through
Dry Wood:
It is an insulator and can't conduct electricity.
Tap Water:
It is a good conductor as it contains dissolved salts.
Glass:
It is an insulator since it can't let electricity pass through.
A velocity vs. time graph for an object is shown. A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 5. A line starts at the origin and ends at (5, 5). Which best describes the acceleration of the object? constant and positive constant and negative changing and positive changing and negative
Answer:
Constant and positive constant
Explanation:
The object move with the same velocity at the same interval
A student has a 3v cell and the resistance in the circuit totals 6 ohms. How much current would flow in a series circuit?
Answer:
[tex]I=0.5 \:A[/tex] is the correct answer.
Explanation:
Using the ohm's law, we have:
[tex]V=IR\\\\I=\frac{V}{R}=\frac{3}{6}\\\\I=0.5 \:A[/tex]
Best Regards!
Which is a resource that the National Park Service manages?
Answer:
Natural areas, historical areas, and recreation areas
Answer:
the answer is B wildlife refuges
Explanation:
The total distance from a house to a school to is 9.5 km. A student travels all the way from his house to the school and back to his house again. The displacement during this journey is:
9.5 km
19 km
0
explain your answer
Answer:
0
Explanation:
Displacement is a vector from initial to final point. Because initial and final point are the same, so displacement is 0.
please help me find the answer
Answer:
26b) 66.7%
27) 500 N
Explanation:
26.a) In a two pulley system, the load is attached to one of the pulleys. The other pulley is attached to a fixed surface, as well as one end of the rope. The other end of the rope goes around moving pulley, then around the fixed pulley.
26.b) Mechanical advantage is the ratio between the forces:
MA = load force / effort force
Efficiency is the ratio between the work:
e = work done on load / work done by effort
Work is force times distance.
e = (F load × d load) / (F effort × d effort)
Rearranging:
e = (F load / F effort) × (d load / d effort)
e = MA × (d load / d effort)
In a two pulley system, the load moves half the distance of the effort. So the efficiency is:
e = (4/3) × (1/2)
e = 2/3
e = 66.7%
27) In a three pulley system, the load moves a third of the distance of the effort.
e = (F load / F effort) × (d load / d effort)
0.40 = (600 N / F) × (1/3)
F = 500 N
An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?
Answer:
Into the page (negative z-axis)
Explanation:
We have a charge moving towards the left (as it is an electron we reverse the direction.)
We have an output motion downwards.
We know that the magnetic field would be in [tex]90^o[/tex] to both direction of charge and motion.
Using Fleming's Left Hand Rule.
Thumb for direction of thrust. (Downwards)
Field for direction of magnetic field (unknown)
Middle finger for direction of current (To the left)
We can determine that the magnetic field would be going into the negative z axis.
I NEED HELP PLEASE, THANKS! :)
A 20.0 cm tall object is placed 50.0 cm in front of a convex mirror with a radius of curvature of 34.0 cm. Where will the image be located, and how tall will it be? Please show all work.
Answer:
i = -12.7 cm; h = 5.07 cm
Explanation:
1. Find the focal length
The focal length of a concave spherical mirror is half of its radius of curvature.
f = ½r = ½ × 34.0 cm = 17.0 cm
2. Find the image distance
A convex mirror produces a virtual image behind the mirror, so the image distance is negative.
[tex]\begin{array}{rcl}\dfrac{1}{o} + \dfrac{1 }{i} & = & \dfrac{1}{f}\\\\\dfrac{1}{50.0} + \dfrac{1 }{i} & = & \dfrac{1}{-17.0}\\\\\dfrac{1}{i} & = & \dfrac{1}{-17.0} - \dfrac{1}{50.0}\\\\& = & \dfrac{50.0 - (-17.0)}{500\times(-17.0)}\\\\& = & \dfrac{67.0}{-850}\\\\i & = & \dfrac{-850}{67.0}\\\\& = & \textbf{-12.7 cm}\\\end{array}[/tex]
3. Find the image size
[tex]\begin{array}{rcl}\\\\\dfrac{h_{\text{i}}}{ h_{\text{o}}} & = & -\dfrac{i}{o} \\\\\dfrac{h_{\text{i}}}{ 20.0} & = & -\dfrac{-12.7}{50.0} \\\\h_{\text{i}} & = & 20.0 \times \dfrac{12.7}{50.0}\\\\& = & \textbf{5.07 cm}\\\end{array}[/tex]
a car travels 30 miles in two hours, what is its speed?
Answer:
15 mph
Explanation:
t ÷ d
time ÷ distance
30÷2
=15
Answer:
15 mph
Explanation:
Speed can be found using the following formula.
s=d/t
where d is the distance and t is the time.
The car traveled 30 miles in 2 hours. Therefore, the distance is 30 miles and the time is 2 hours.
d=30 miles
t=2 hours
s= 30 miles/2 hours
Divide 30 by 2
s=15 miles/hour
The car's speed is 15 miles per hour.
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.
Learn more about electric current here: https://brainly.com/question/24301101
The tip of second's hand of a clock take 60 seconds to to move once on the circular dial of the clock. If the radius of the dial of the clock be 10.5 cm, calculate the speed of the tip of the second's hand of the clock.
Answer:
( About ) 1.1 cm / s
Explanation:
We know that the time it takes the clock's second hand to move is 60 seconds. Respectively the radius of this clock is given to be 10.5 centimeters.
_______________________________________________________
Let us apply the formula speed = distance traveled / time. Here the " distance traveled " is the circumference of the clock, or 2πr - where we can pose π as 3.14. In other words, Speed = 2πr / time. Substitute known values to solve for the Speed,
S = 2 * 3.14 * 10.5 / 60,
Speed = ( About ) 1.1 cm / s
Hope that helps!
BRAINLIEST! I NEED HELP ASAP!
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.
To learn more about the image refer to the link;
https://brainly.com/question/25029470
#SPJ1
6 points + Brainliest asap!
If you double the amplitude of a box on a spring, how would that affect the acceleration at maximum displacement?
The acceleration would double.
The acceleration would remain the same.
The acceleration would triple.
The acceleration would be cut in 1/2.
Answer:
The acceleration would double
Explanation:
Assuming the same box and spring, the maximum acceleration is proportional to amplitude. When the amplitude doubles, the acceleration would double.
__
A spring is generally considered to have a linear force vs. distance characteristic. Hence, doubling the distance doubles the force. The acceleration is proportional to the force.
how wood helps in home insulation plz answer fast
plz answwweeeeeeerrrrrrr
Wood is a natural insulator due to air pockets within its cellular structure, which means that it is 15 times better than masonry, 400 times better than steel, and 1,770 times better than aluminum. In addition, lightweight wood framing methods allow easy installation of additional fibre or foil insulation. i hope this is better
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.
Which of the following best describes atoms with low electronegativity?
A. They tend to lose electrons and become cations.
B. They tend to lose electrons and become anions.
C. They tend to gain electrons and become cations
D. They tend to gain electrons and become anions.
Which is the process by which a gas changes to a solid? deposition evaporation freezing sublimation
Answer:
Deposition
Explanation:
Answer:
deposition
Explanation:
qasdsfa32
An 18-kg bicycle carrying a 62-kg girl is traveling at a speed of 7 m/s. What is the kinetic energy of the girl
and bicycle combined together?
Answer:
1960 J
Explanation:
EK = (18 kg + 62 kg)[tex](7.0 m/s)^{2}[/tex]/2 = 1960 J
I NEED HELP PLEASE, THANKS! :) A rubber rod can be charged negatively when it is rubbed with wool. What happens to the charge of the wool?
Answer:
A rubber rod can be charged negatively when it is rubbed with wool. If the rubber rod is charged negatively, a positive charge is induced into the wool. Remember, whenever two neutral objects are rub against each other , an opposite charge is induced in both of the objects.
The impact on the charge of the wool should be explained below:
Impact on the wood charge:A rubber rod could be charged negatively at the time when it is rubbed with wool. In the case when the rubber rod is charged negatively, a positive charge should be induced into the wool. Also, whenever two neutral objects are rubbed against each other, an opposite charge should be induced in both of the objects.
Learn more about charge here: https://brainly.com/question/13030344
Explain briefly the first aid measure that should be taken incase of poisoning
Answer:
How you treat someone who may have been poisoned depends on:
The person's symptoms
The person's age
Whether you know the type and amount of the substance that caused poisoning
If you are concerned about possible poisoning, call Poison Help at 800-222-1222 in the United States or your regional poison control center. Poison control centers are excellent resources for poisoning information and, in many situations, may advise that in-home observation is all that's needed.
A car moving at a rate of 72 km per hr. How does it moves if it stop after 4 seconds?
Answer:
80 meters
Explanation:
Answer:
So the distance covered is 80meters
Explanation:
Speed=72km/h=20m/s
Time=4seconds
Distance covered=?
As we know that
Speed=distance covered/time taken
Speed*time taken=distance covered
Putting values
Distance covered=20m/s*4s
Distance covered =80meters
I hope it will help you
Archer shoots his arrow towards a target at a distance of 90 m and hits bullseye . Calculate the acceleration and time taken by the arrow to hit the target with a velocity of 90.0 m/s
Answer:
acceleration = 45 m/s²
Time = 20 seconds
Explanation:
We are given;
Distance; s = 90m
Final velocity;v = 90 m/s
Since shot from rest, initial velocity;u = 0 m/s
So, to find the acceleration, we can use Newton's 2nd law of motion which is;
v² = u² + 2as
Where a is acceleration
Plugging in the values;
90² = 0² + 2a(90)
8100 = 180a
a = 8100/180
a = 45 m/s²
Now, for the time, we will use Newton's 1st law of motion which is;
v = u + at
Where t is time;
So;
90 = 0 + 4.5t
90 = 4.5t
t = 90/4.5
t = 20 seconds
11. What is the wavelength of an earthquake wave if it has a speed of 5000 m/s and a frequency of 10 HZ
step#1
step#2
step#3
Answer:
500 m
Explanation:
The applicable relation is ...
wavelength = speed/frequency
wavelength = (5000 m/s)/(10 cycles/s) = 500 m/cycle
The wavelength is 500 meters.
when light passess from air into glass the angle of incidence is always _______ the angle of refraction
Explanation:
The angle of incidence is always smaller than the angle of refraction
Which of the following are valid expressions?
Answers:
validnot validvalidnot validnot validvalidIn short, the boxes you check will be box 1, box 3, box 6.
================================================
Explanation:
It's not stated, but I'm assuming that A,B,C are three dimensional vectors
I'll go through each answer choice to say whether it's valid or not.
---------------------------
Choice 1
A x B is some vector
(A x B) x C is some other vector. Cross products produce vectors as outputs, when the two inputs are both 3D vectors. The output vector is the same dimension as the inputs.
Overall, the expression (A x B) x C is valid.
---------------------------
Choice 2
A dot B is a scalar
(A dot B)C is some vector
A dot (B x C) is a scalar
We cannot add a scalar to a vector. The given expression (A dot B)C + A dot (B x C) is not valid
---------------------------
Choice 3
B x C is a vector
B dot (B x C) is scalar
A[ B dot (B x C) ] is a vector in the form kA with k as a scalar.
The overall expression is valid
---------------------------
Choice 4
B x C is a vector
B(B x C) is not valid. We need to use a dot or cross symbol between the B and (B x C).
If we had kB with k as a scalar, then we don't need a symbol between them.
---------------------------
Choice 5
A dot B is a scalar
Scalars are not allowed when it comes to cross products, so (A dot B) crossed with anything is not valid.
---------------------------
Choice 6
B x C is some vector
A dot (B x C) results in a scalar
The expression is valid
(d) In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. The type of radiation emitted from a radioactive source can be identified by comparing the properties of the radiation to the properties of alpha, beta and gamma radiation. Describe the properties of alpha, beta and gamma radiation in terms of their: • penetration through materials • range in air • deflection in a magnetic field.
Answer:
Hey!
I did this question and have the answers/potential things you can write!
XD
Explanation:
Here!
structure
•alpha particle consists of a helium nucleus
•alpha particle consists of 2 protons and 2 neutrons
•a beta particle is an electron
•a beta particle comes from the nucleus
penetration
•alpha particles are very poorly penetrating
•alpha particles can penetrate a few cm in air
•alpha particles are absorbed by skin
•alpha particles are absorbed by thin paper
•beta particles can penetrate several metres of air
•beta particles can pass through thin metal plate / foil
•beta particles can travel further than alpha particles in air
•beta particles can travel further than alpha particles in materials eg metals
deflection
•alpha particles and beta particles are deflected in opposite directions in an electric field
•beta particles are deflected more than alpha particles
•alpha particles have a greater charge than beta particles but beta particles have much less mass or beta particles have a greater specific charge than alpha particles
Hope this helps!
Sorry if it's a bit too long!
Para que ángulo el alcance es igual a la altura máxima en un lanzamiento de proyectil ideal sobre un plano horizontal. Translation: For which angle the range equals the maximum height in an ideal projectile launch on a horizontal plane. a) 45º b) 60º c) 76º d) 90º
Answer:
76°Explanation:
In projectile,
Maximum height = [tex]\frac{u^{2}sin^{2} \theta }{2g}[/tex] and range = [tex]\frac{u^{2}sin2\theta }{g}[/tex]
u = velocity of the body
[tex]\theta[/tex] = angle of launch
g = acceleration due to gravity
If the range equals the maximum height in an ideal projectile launch on a horizontal plane, this means;
[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}sin2\theta }{g}[/tex]
since [tex]sin2\theta = 2sin\theta cos\theta[/tex]
[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}2sin\theta cos\theta }{g}\\\frac{sin\theta}{2} =2cos\theta \\sin\theta = 4cos\theta\\\frac{sin\theta}{cos\theta} = 4\\tan\theta = 4\\\theta = tan^{-1} \\4\theta = 75.9^{0}[/tex]
The angle at which the range equals the maximum height in an ideal projectile launch on a horizontal plane is approximately 76°
Animal studies indicate that
Answer: mammals may be relatively better at solving problems than birds.
Answer: A
Explanation:
mammals may be relatively better at solving problems than birds
Look at figure D . Explain what will happen if a larger mass it put on the force meter
it will experience great force
Stars which can be seen all year long are called___.
Answer:
you can see them in the night
Explanation:
also in the day they are there but you can't see it
Answer:
Hey!
Your answer is Circumpolar Stars!
Explanation:
These are stars which appear to revolve (spin/turn) around the polar axis (N and S) and do not set below the horizon.
Hope this helps!