Answer: 5cm
Explanation:
Given the following :
Image height = 18cm
Object height = 10cm
u = object distance
v = image distance = 9 cm
Using the relation:
image height/object height= v/u
18/10 = 9/u
Cross multiply
18 × u = 10 × 9
18u = 90
u = 90/18
u = 5cm
Therefore,
Object distance from mirror = 5cm
Answer:
5 cm
Explanation:
correct on edge 2020/2021
If you add a small amount of hydrochloric acid to 4 liters of water, you would create a _____ solution.
A.) concentrated
B.) weak
C.) dilute
D.) basic
Answer:
The answer is D.
Explanation:
An example of a weak base is ammonia. It does not contain hydroxide ions, but it reacts with water to produce ammonium ions and hydroxide ions. The position of equilibrium varies from base to base when a weak base reacts with water. The further to the left it is, the weaker the base.
Answer:
The correct answer is C.) dilute
What is the resultant acceleration?
A. The scalar that joins all the points along the path
B. The resultant displacement divided by time
C. The sum of all the acceleration vectors
D. The average of all the acceleration vectors
Answer: C.
The sum of all the acceleration vectors
Explanation: The word resultant means the sum of two or more vectors.
Since acceleration is a vector quantity,
The resultant acceleration will be the sum of all the acceleration vectors. Where there are two or more acceleration to be considered on an object in a system.
PLEASE HELP ASAP URGENT!!!!!
Which statement is true of AC current?
A.
It uses a battery as a power source.
B.
It can easily be transformed from high voltages to low voltages.
C.
It is typically low voltage.
D.
the electrons are moving in one direction
E.
It was the first type of electric current invented.
Answer:
B
i am not fully sure but i believe its the most accurate its either A or B
Answer:
b
Explanation:
plato
What kind of friction exists between solid objects moving in water?
static friction
sliding friction
rolling friction
drag
Answer:
Drag friction.
Explanation:
If you have a solid object, go through air, it experiences drag because the air molecules push back a tiny bit. This drag is enhanced because in water, the molecules are more resistant than air, that's why if you try to run in knee deep water, you experience much more drag than when you are running with your legs out of the water.
A student finds a resistor in an old transistor radio. When the resistor is attached to a 1.5 V cell, the flow of current is measured at 0.025 A. When the resistor is attached to four 1.5 V cells, the current is measured at 0.1 A. When the resistor is attached to a 9 V battery, the current is measured at 0.15 A. Is the resistor an ohmic resistor? Explain how you know.
Answer:
yes
Explanation:
because no matter what voltage you connect it up to, the current always increases proportionally to the voltage.
this is because it follows ohm's law V = I X R.
(voltage = current X resistance)
so to calculate the resistance, change the formula to R = V / I giving you 60 ohm (resistor value)
the value of the resistor is always 60 ohm's, no matter which combination of voltage and current you used and measured, so it follows ohm's law, therefore being an ohmic resistor
A 41 turn rectangular coil of dimensions 5.00 cm ✕ 10.0 cm is allowed to fall from a position where B = 0 to a new position where B = 0.520 T and the magnetic field is directed perpendicular to the plane of the coil. Calculate the magnitude of the average emf that is induced in the coil if the displacement occurs in 0.330 s.
Explanation:
We have,
Number of turns in a coil is 41
Dimensions of a rectangular coil is 5 cm by 10 cm
Initial magnetic field is 0 and new field is 0.52 T. The magnetic field is directed perpendicular to the plane of the coil.
It is required to find the magnitude of the average emf that is induced in the coil if the displacement occurs in 0.330 s. According to Faraday's law,
[tex]E=\dfrac{-d\phi}{dt}[/tex]
[tex]\phi[/tex] = magnetic flux
[tex]E=\dfrac{-d(NBA)}{dt}\\\\E=NA\dfrac{-(B_f-B_i)}{dt}\\\\E=41\times 0.005\times \dfrac{(0.52)}{0.33}\\E=0.32\ V[/tex]
So, the magnitude of induced emf is 0.32 V.
The tip of a triangle is held 12.0 cm above the surface of a flat pool of water. A submerged swimmer in the pool sees the tip of the triangle at what distance above the water? Let the indices of refraction nwater = 1.33 and nair = 1.00.
Answer: 9cm
Explanation:
Refractive index can also be defined as the ratio of the real depth to the apparent depth.
Given that the
Real depth = 12 m
Refractive index of water = 1.33
Refractive index of air = 1.00
nair/nwater = real depth/apparent depth
Substitute all the parameters into the formula
1.33/1 = 12/ apparent depth
Cross multiply
1.33 Apparent depth = 12
Apparent depth = 12/1.33
Apparent depth = 9.02 cm
Therefore, A submerged swimmer in the pool sees the tip of the triangle at 9cm approximately distance above the water.
A space shuttle is sitting stationary at the launch pad.
What is the kinetic and potential energy of the shuttle?
A. potential energy: low
kinetic energy: low
B. potential energy: low
kinetic energy: zero
C. potential energy: high
kinetic energy: low
D. potential energy: high
kinetic energy: zero
Answer:
The answer is B.
Explanation:
I got the question right on this one.
Answer:B. potential energy: low
kinetic energy: zero
Explanation:
Hypothesis:
Part A
If we split a laser beam by using a diffraction grating slide, then we can
verify the _____________ by applying the formula λ = ds/l.
2) Part B If we split light into its individual wavelengths using a diffraction grating,
then we can determine the _____________ by multiplying the spacing of the
gradient lines (d) times the distance to the central maxima of the color band (s)
divided by the length distance from the grating slide to the screen (l).
Answer:
1.) Wavelength
2.) Number of fringes
Explanation:
1.) If we split a laser beam by using a diffraction grating slide, then we can
verify the wavelength by applying the formula λ = ds/l.
2) If we split light into its individual wavelengths using a diffraction grating,
then we can determine the number of fringes by multiplying the spacing of the gradient lines (d) times the distance to the central maxima of the color band (s) divided by the length distance from the grating slide to the screen (l).
If a person has a mass of 60 kg and a velocity of 2 m/s, what is the
magnitude of his momentum?
A. 1,176 kg-m/s
B. 58 kg-m/s
C. 30 kg-m/s
D. 120 kg-m/s
Answer:
120
Explanation:
P = MV
so 60 x 2 will give you a momentum of 120
Starting with the Sun, trace the path of energy that occurs in order for you to lift a
book off the ground, describing each energy transformation.
plz leave an explanation thx c:
Answer: see the answer in the explanation.
Explanation:
The energy produce by the sun is called solar energy which eventually produces light energy. The light will make you to see the book and insinuate mechanical energy within you. In order for you to lift abook off the ground the energy involved is mechanical energy which involves potential energy to kinetic energy transformation
The famous scientist Galileo Galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. By changing the slope, he could study how the speed at which the ball rolled was affected.
What was one thing Galileo would have needed to control himself to make sure his experiment gave him useful information?
A. the speed of the ball
B. the slope of the plane
C. the pull of Earth's gravity
D. the material the ball was made of
What happens to the resistance of a wire as its length increases? A. The resistance decreases. B. The resistance is not affected by a change in wire length. C. The resistance alternates between high and low values. D. The resistance increases.
Answer:
D. The resistance increases.
Explanation:
Resistance of a wire is R = ρL/A, where ρ is the resistivity of the wire, L is the length, and A is the cross sectional area.
As L increases, R increases.
Cooling down after a workout allows the oxygen to continuing moving through the body and keeps the muscles from tightening up to fast.
True
False
Answer: true
Explanation:
Answer:
True
Explanation:
Electrical Force is possible because of
Answer:
Electrical forces result from mutual interactions between two charges. ... The direction of each of these three forces can be determined by applying the basic rules of charge interaction: oppositely charged objects attract and like-charged objects repel
Explanation:
Which model below correctly represents an object with a correct pair of magnetic domains?
Answer: The term magnetism comes from the region of Magnesia, a city in Western Turkey, where Greeks found lodestones, which attracted iron pieces across the space. It is also observed that, magnets attract as well as repel. We can explain this dual nature of magnetic force by proposing that each magnet has two poles, north pole (N) and south pole (S). You will observe two things during the activities:
1) When two magnets are brought near each other, like poles repel; opposite poles attract.
2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.
hope this helps u stay safe
Please answer as soon as possible.
A Physics question about electricity and circuits.
1. why does the sun have the greatest amount of gravity in our solar system?
Answer:
it is the biggest object that is the closest to us
Explanation:
Why does the winds move? What makes it move,?
Explanation:
The wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
HOPE THIS HELP YOU !!! :)))The wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
Why does the wind move?
he wind blows because of differences in air pressure. ... Instead, the wind blows anti-clockwise around the low pressure area in the Northern Hemisphere and clockwise in the Southern Hemisphere. This is the effect of the earth's rotation, which produces a force, called Coriolis, that deflects the wind from its path.
Why does air move to one place or another?
Air moves because the sun generates heat on the earth, this causes hot air, hot air rises creating wind, the air which is made up of 02 C02 and many other gases is carried by wind. air moves from place to place due to the different temperature and pressure conditions on the earth
What are two layers that can stop alpha radiation?
non-ionizing radiation and ionizing radiation.
Car A
Mass: 1,500 kg
Velocity: 10 m/s
Car B
Mass: 1,500 kg
Velocity: 25 m/s
Car C
Mass: 1,000 kg
Velocity: 10 m/s
Which order shows decreasing momentum?
car c
because light weight objects can move fast but it goes slow
hope it helps :-)
Answer:
B,A,C
so yeah
A dead organism is the same as a nonliving thing in science.
Fact:
Evidence:
Answer:
Myth: A dead organism is the same as a nonliving thing in science. ... Things that are dead once did have the characteristics of life, but when they die, they lose some of the characteristics. That is why dead and non-living are NOT the same thing.
Answer:
Non-living thing is never alive.
Dead thing was once alive.
Living things can breathe, grow, reproduce, detect and respond to the changes in the environment, excrete, use the energy from the environment. E.g., Animals
Non-living things don't exhibit these characteristics. E.g., Soil, air
Let's take an example of living things, say lion. When a lion dies, we never say,”Lion has become a non living thing now”. But we say,” Lion is dead”. Death can only happen to living things.
Lion is dead now. But it was once alive.
But soil is never alive. Never dead too!
Hope this helps!
Have a great day!
Explanation:
A denser medium will generally make a sound wave travel
faster
the same speed
not at all
slower
The correct answer is A. Faster
Explanation:
Sound, which is composed of vibration, travels through waves. Additionally, the speed of sound waves is affected by the medium and the density of it. Indeed, the denser the medium is the higher the speed of sound is. For example, in the air, the speed of sound is around 343 meters per second while in water and similar liquids that have a higher density the speed is approximately 1500 meters per second, and this speed increases if the sound travels through a solid. This occurs because in dense substances particles are closer, and therefore waves can travel faster. Thus, in a denser medium will generally make a sound wave travel faster.
What is the time period of vibration?
Answer:
A time period is denoted by 'T' . It is the time to complete one cycle of vibration. As the frequency of a wave increases, the time period of the wave decreases. The unit for time period is 'seconds
HOPE IT HELPS :)
PLEASE MARK IT THE BRAINLIEST!
If we have several different light bulbs connected to a battery in series, then ___.
The resistance will be the same across each bulb.
The current will be the sum of individual voltages across each bulb.
The current will be the same across each bulb.
The voltage will be the same across each bulb.
Answer:
The current will be the same across each bulb.
3. The circuit below shows two outdoor lights, run by a battery. Four amps of
current leave the battery. Explain how the current splits to go through both light
bulbs. Be as specific as you can.
Answer:
The answer to your question is given below.
Explanation:
From the diagram given in the question, we can see that the bulbs are in parallel connection. This implies that different current will go through the bulb but the same voltage. But the resistance of each bulb is the same, therefore the same current current will go through them.
This can further be understood if we determine the current flowing through each bulb. This is illustrated below:
Voltage (V) = 30V
Resistant 1 (R1) = 15Ω
Current 1 (I1) =..?
V = I1R1
30 = I1 x 15
Divide both side by 15
I1 = 30/15
I1 = 2A.
Voltage (V) = 30V
Resistant 2 (R2) = 15Ω
Current 2 (I2) =..?
V = I2R2
30 = I2 x 15
Divide both side by 15
I2 = 30/15
I2 = 2A.
The overall current(I) in the circuit:
I = I1 + I2
I = 2 + 2 = 4A.
From the illustrations above, we can see that the same current will flow through each bulb as the will current split into two equal parts
A ray moving through glass (n = 1.51) passes into acetone (n = 1.36). How much does its velocity change?
Answer:
Change in velocity = 0.219 × 10⁸ m/s (Approx)
Explanation:
Given:
Ray moving through glass (n1) = 1.51
Ray moving through (n2) = 1.36
Find:
Change in velocity.
Computation:
Speed of light = 3 × 10⁸
Change in velocity = [(c/n2) - (c/n1)]
Change in velocity = [(c/n1) - (c/n1)]
Change in velocity = 3 × 10⁸[(1/1.36) - (1/1.51)]
Change in velocity = 3 × 10⁸[0.7352-0.6622]
Change in velocity = 3 × 10⁸[0.073]
Change in velocity = 0.219 × 10⁸ m/s (Approx)
Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity
Answer:
C. Beats
Explanation:
When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Answer:
beats
Explanation:
got it right
Select the correct answer.
Which situation may cause delayed rigor mortis?
A.
The victim was found in the summer during a heat wave.
B.
The victim died a violent death.
C.
The victim was sleeping at the time of death.
OD. The victim died of cancer.
Reset
Next
Answer: the answer is C
Explanation:
You can re-direct your strong emotions by doing which of the following? A. Help someone else. B. Listen to music. C. Do something you enjoy. D. All of the above
Answer:
D. All of the above
Explanation:
Everyone does something different to re-direct their strong emotions.
