The true statement about the image formed by the concave lens is virtual.
Properties of image of formed by a concave lens
The properties of image of formed by a concave lens include the following;
The images are always;
virtual, erect, and diminishedThus, the true statement about the image formed by the concave lens is virtual.
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Answer:
it mf a i think
1. What is responsible for the different phases of matter?
2. What is the temperature at which a substance changes from a liquid to a solid?
3. What is the phase change from a gas to a liquid?
4. What is the phase change from a solid directly to a gas?
Answer:
1. The five phases of matter. There are four natural states of matter: Solids, liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together so they don't move much.
2. The temperature at which a substance changes from the liq- uid state to the solid state is called the freezing point. The freez- ing point of the liquid state of a substance is the same temperature as the melting point of the solid state. For example, solid water melts at 0°C and liquid water freezes at 0°C.
3. The process of a liquid becoming a gas is called boiling (or vapourization), while the process of a gas becoming a liquid is called condensation. 4. Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.
Explanation:
hi
2. If Peter is traveling .25 m/s on his bike, how long will it take him to reach
a fence that is 12 meters away?
a. 3 s
b. 20 s
c. 12 s
d. 48 s
Answer:
48 seconds
Explanation:
Since S=d/t, plug in the known values and solve
0.25m/s=12m/t
0.25m/s*t=12m
t=12m/0.25m/s
t=48 seconds
A fireboat is to fight fires at coastal areas by drawing seawater with a density of 1030 kg/m3 through a 10-cm-diameter pipe at a rate of 0.04 m3/s and discharging it through a hose nozzle with an exit diameter of 5 cm. The total irreversible head loss of the system is 3 m, and the position of the nozzle is 3 m above sea level. For a pump efficiency of 70 percent, determine the required shaft power input to the pump and the water discharge velocity.
Answer:
50.93 m/s
199.5 kW
Explanation:
From the question, the nozzle exit diameter = 5 cm, Radius= diameter/2= 5cm/2= 2.5cm. we can convert it to metre for unit consistency= (2.5×0.01)=
0.025m
We can calculate the The cross sectional area of the nozzle as
A= πr^2
A= π ×0.025^2
= 1.9635 ×10^- ³ m²
From the question, the water is moving through the pipe at a rate of 0.1 m /s , then for the water to move through it at a seconds, it must move at
(0.1 / 1.9635 ×10^- ³ m²)
= 50.93 m/s
During the Operation of the pump, the Dynamic energy of the water= potential energy provided there is no loss during the Operation
mgh = 1/2mv²
We can make "h" subject of the formula, which is the height of required head of water
h = (1/2mv²)/mg
h= v² / 2g
h = 50.93² / (2 ×9.81)
h = 132.21m
From the question;
The total irreversible head loss of the system = 3 m,
the given position of nozzle = 3 m
the total head the pump needed=(The total irreversible head loss of the system + the position of the nozzle + required head of water )
=(3 + 3 + 132.21m)
=138.21m
mass of water pumped in a seconds can be calculated since we know that mass is a product of volume and density
Volume= 0.1m³
Density of sea water=1030 kg/m
(0.1 m^3× 1030)
= 103kg
We can calculate the Potential enegry, which is = mgh
= (103 ×9.81 × 138.21)
= 139651.5 Watts
= 139.65kW
To determine required shaft power input to the pump and the water discharge velocity
Energy= efficiency × power
But we are given efficiency of 70 percent, then
139651.5 Watts = 0.7P
=199502.18 Watts
P=199.5 kW
Therefore, the required shaft power input to the pump and the water discharge velocity is 199.5 kW
Particles in which state of matter are the most likely to interact with each other to cause a chemical reaction?
If a ball is thrown at a wall at 3 m/s (with NO air resistance), with what velocity will it
hit the wall?
Answer:
3 m/s
Explanation:
have a good day
A liquid has a density of 0.85 g/cm. If you pour some of the liquid into a glass of water, will the liquid float?
Explain how you know
PLEASE HURRY
Answer:
Yes, it will float.
Explanation:
It is given that,
A liquid has a density of 0.85 g/cm³.
We know that, the density of water is 1 g/cm³.
The density of the liquid is less than that of water. If the density of the liquid is less than that of water, it will float in it. Hence, if you pour some of the liquid into a glass of water, it will float.
Guys i need help please
Answer:
I'm pretty sure the answer is around 9.2 seconds
Explanation:
The snow fell on me is my excuse so my mom won’t know that I’m getting bullied
Answer:
Aaaaw noooo. :(
Explanation:
what did they say to u and what state do u live in. I will help u stand up to them. I have taken down many bullies before by using words. in fourth grade, my friend was getting bullied by the class, then yelled and stood up for her. they all fell silent and never bullied her, or any of my friends again. For whatever reason they bully u is probably d.u.m.b. which means they r really d.u.m.b. Also, U should try finding out a lot of personal info about them that they dont want anyone to know. also tell the principal. Is ur mom nice, or mean? if shes nice, she'll support u and fight for u, which means u should address
Answer:
You should stick up for yourself because if you don't then no one else will but im always here to talk to you if you need someone
Explanation:
A phase diagram assumes______
is kept constant.
Odensity
O volume
O temperature
O pressure
Cardiovascular fitness measures the health of which body system?
Answer:
I believe it is the circulatory system.
Explanation:
Have a nice day.
Allison pulls on a refrigerator with 200 N of force. Fred helps
her out and pulls on the refrigerator in the same direction with
300 N of force. What is the net force on the refrigerator?
N
Answer:500
Explanation:
If two forces are acting on an object in the same direction, then they will add up and the net force will be the sum of their magnitudes. Thus, the net force on refrigerator is 500 N.
What is force?Force is an external agent acting on a body to deform it or to change it form the state of rest or motion. There are various kinds of forces, such as gravitational force, frictional force, magnetic force etc.
If two forces are acting on a on an object in the same direction, then they will add up and the net force will be the sum of their magnitudes. If they are acting from the opposite directions, they will cancel each other in magnitude and and the net force will be the subtracted value.
Here, both Allison and fred pulls the refrigerator from the same direction and the net force is the sum of forces by each person. Therefore, the net force here is 300 + 200 = 500 N.
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A 2 kg blue car is moving 6 m/s to the right and collides with a 3 kg red car that is moving 2 m/s to the left. The cars collide and stick together. What is their velocity after the collision? Include units on your answer.
Answer:
Their velocity after the collision is 1.2 m/s, to the right.
Explanation:
Given;
mass of the blue car, m₁ = 2 kg
initial velocity of the blue car, u₁ = 6 m/s
mass of the red car, m₂ = 3 kg
initial velocity of the red car, u₂ = 2 m/s
let the blue car moving to the right be in positive direction
also, let the red car moving to the left be in negative direction
Apply the principle of conservation of linear momentum for inelastic collision.
m₁u₁ - m₂u₂ = v(m₁ + m₂)
where;
v is their velocity after the collision
(2 x 6) - (3 x 2) = v(2 + 3)
12 - 6 = 5v
6 = 5v
v = 6/5
v = 1.2 m/s, to the right
Therefore, their velocity after the collision is 1.2 m/s, to the right.
A particle is moving with simple harmonic motion of period 8•0 s and amplitude 5•0 m Fine (A). The speed of the particle when it's 3•0 m from the centre of it's motion (B). The maximum speed (C). The maximum acceleration
Answer:
a. v(1.8) = -3.14 m/s
b. [tex]v_{max} = 3.925\ m/s[/tex]
c. [tex]a_{max} = 3.08\ m/s^2[/tex]
Explanation:
a.
The speed of a particle executing simple harmonic motion is given by the following equation:
[tex]v(t) = -A \omega \ Sin(\omega t)[/tex]
where,
v = velocity = ?
A = Amplitude = 5 m
ω = angular frequency = [tex]\frac{2\pi}{Time Period} = \frac{2\pi}{8\ s}[/tex] = 0.785 s
t = time
First we find time at 3 m by using equation for displacement:
[tex]x = 3\ m = ACos(\omega t)\\Cos((0.785 rad/s)(t)) = \frac{3\ m}{5\ m}\\t(0.785\ rad/s) = Cos^{-1} (0.6)\\t = \frac{0.927\ rad}{0.785\ rad/s}\\t = 1.18 s[/tex]
Therefore,
[tex]v(1.8) = velocity at 3\ m = -A\omega Sin(\omega t)\\v(1.8) = -(5\ m)(0.785\ rad/s)Sin((0.785\ rad/s)(1.18\ s))\\[/tex]
v(1.8) = -3.14 m/s
c.
The maximum speed is given as:
[tex]v_{max} = A\omega\\v_{max} = (5\ m)(0.785\ rad/s)\\[/tex]
[tex]v_{max} = 3.925\ m/s[/tex]
The maximum acceleration is given as:
[tex]a_{max} = A\omega^2\\v_{max} = (5\ m)(0.785\ rad/s)^2\\[/tex]
[tex]a_{max} = 3.08\ m/s^2[/tex]
Which three characteristics do mechanical waves and electrocmagnetic
waves share?
A. The waves begin with a disturbance.
O B. The waves transfer energy from its source.
C. The waves and their energy move outward from the source.
D. The waves and their energy can travel through empty space.
Answer:
It is A, B, and C
Explanation:
I just took the test!
The three characteristics mechanical waves and electromagnetic waves share are:
A. The waves begin with a disturbance.
B. The waves transfer energy from its source.
C. The waves and their energy move outward from the source.
What are mechanical waves and electromagnetic waves?Usually, waves transfer energy from one place to another. Mechanical waves transfers via matter where as electromagnetic waves transfers via light. Both mechanical waves and electromagnet (light) waves measured through amplitude, wavelength, frequency and both will get transmitted, refracted, reflected, absorbed, diffracted when they react with matter. Both the electromagnetic waves and mechanical waves are transverse in nature but the mechanical waves can also be in longitudinal.
So, many characteristics were similar for mechanical waves and electromagnetic waves.
Hence, Option A, B, C are the three characteristics.
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harold threw a baseball 3 meters harold is 2 meters tall. how fast did he throw the ball and how long was it in the air
Answer:
u = 7.74 m/s and t = 1.82 s
Explanation:
Given that,
Harold threw a baseball 3 meters.
Harold is 2 meters tall.
The vertical distance = 3m
The final velocity at the maximum height is 0.
Let u is the initial velocity of the baseball. Using the first equation of motion to find it as follows :
[tex]v^2-u^2=2as[/tex]
Here, a = -g
[tex]v^2-u^2=-2gs\\\\u=\sqrt{2gs} \\\\=\sqrt{2\times 10\times 3} \\\\=7.74\ m/s[/tex]
He has thrown it with the speed of 7.74 m/s
Let t is the time taken by the ball to fall on the ground.
Harold is 2 meters tall. Using second equation of motion to find it.
u = -7.74 (as downward direction is taken as positive)
[tex]s=ut+\dfrac{1}{2}at^2\\\\2=-7.74t+5t^2\\\\t=1.82\ s[/tex]
Hence, this is the required solution.
Why are states in the mid-central United States more likely to have tornados than other areas?
Answer:
because this is where Arctic air, cold fronts that have not been "weakened". As these fronts head further east, they sometimes lose their strength as they travel over more warm air.
A teacher needed to get a box of old books onto the top shelf of a bookcase in a new
apartment. The box was on the floor at the base of the bookcase. The box had a mass
of 15.0 kg, and it was lifted at a constant speed to the top shelf. A.220 B.22.5 C.0 D.16.5
Answer:
WHY THE HE!! DO YOU HAVE B00BS AS YOUR
PIC
Explanation:
A student wants to use a ramp to move boxes into a truck bed that is 3 m high. He has a choice of 2 different ramps. The length of one ramp is 4m, and the length of the other ramp is 6m. Which one will make his work easier?
Answer:
the ramp with 6 m length will be easier to work with.
Explanation:
the mechanical advantage of the ramp can be calculated to find out which ramp will be easier to work with. The ramp with greater mechanical advantage will be easier to work with. The formula for the mechanical advantage of ramp is given as follows:
[tex]M.A = \frac{L}{h} \\\\[/tex]
where,
M.A = Mechanical Advantage = ?
L = Length of Ramp
h = height of ramp = 3 m
FOR L =4 m:
[tex]M.A = \frac{4\ m}{3\ m}\\\\M.A = 1.33[/tex]
FOR L = 6 m:
[tex]M.A = \frac{6\ m}{3\ m}\\\\M.A = 2[/tex]
Since, the ramp with length 6 m has a greater mechanical advantage.
Therefore, the ramp with 6 m length will be easier to work with.
The second choice ramp with length of 6 m will make his work easier.
The given parameters;
height of the ramp, h = 3 mlength of the first ramp = 4 mlength of the second ramp = 6 mThe mechanical advantage of the each of the choices is calculated as follows;
First choice:
[tex]M.A = \frac{l_1}{h} \\\\M.A = \frac{4}{3} \\\\M.A = 1.333[/tex]
Second choice:
[tex]M.A = \frac{l_2}{h} \\\\M.A = \frac{6}{3} \\\\M.A = 2[/tex]
Thus, we can conclude that the second choice ramp with length of 6 m will make his work easier.
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A velocity-time graph shows how what changes over time.
Answer:
velocity changes over time.
if you punch a wall with the force of 30N, what force will you feel on your fist
30N
Natural reaction, the same force comes back to you
Answer:
it depends on if collision elastic or in elastic
if collision is elastic the the wall will also exert 30 N
Where is the planet moving faster?
LOGARITHMIC functions have 2 asymptotes
True
False
Answer:
true
Explanation:
true
When thermal energy is added to an object, what happens to the motion of the particles?
A.
increases
B.
decreases
C.
remains unchanged
D.
decreases, then increases
The answer is A
Explanation:
1.) Describe the shape, movement of particles, and the volume of a solid.
2.) Describe the shape. movement of particles, and the volume of a liquid.
30 points please help me ??? ASAP
Answer:
Solids have a definite shape and volume, its particles vibrate slowly.
Liquids have no definite shape, the particles move randomly around its container, and they have a fixed volume.
Plz do all of it i will give brainlest and thanks to best answer
plz do it right
Answer:
d
Explanation:
Answer:
Earth absorbs heat from the sun.
Explanation:
This radiation is absorbed by greenhouse gases which then radiate energy into all directions including downwards and thereby trapping heat in the atmosphere.
Hope you have a good day :)
Choose ne
1. Water is optically rarer than_____
a. glass
b. air
c. diamond
d. both b and c
Answer:
diamond
Explanation:
im not 100% sure so my bad if im wrong
How are electromagnets similar to other magnets?
Answer:
Well, Both Are For Sure Magnets! But electromagnets need to use electricity!
Explanation:
A Wendys Roast For You!
How do ions help your brain?
Please do all of i will give you brainlest and thanks to best answer plz do it right
Answer:
the answer is B
Explanation:
because i had this question in 8th grade
Ram travel 50metre on a straight road in 30second . hari covers the same distance on the same road in 45s . who has done more work ? who has more ? Explain in short
Answer:
The ram has done more work because the rate at which the ram work is 1.6m/s and Hari is 1.1m/s
