Answer:
-1.6
Explanation:
e2021
The Height of an Image for a Convex Mirror is calculated by using magnification equation
m = h(i) / h(o) = − d(i) / d(o) ,where
the magnification index of the mirror, m
the height of the object, h(o)
the height of the image, h(i)
the distance between the object and the mirror, d(o)
the distance between the image and the mirror, d(i)
h(i)/ 2 = -8 / 10
h(i) = -1.6 cm.
What is convex mirror ?"Convex Mirror is a curved mirror where the reflective surface bulges out towards the light source. This bulging out surface reflect light outwards and are not used to focus light."
What is magnification equation ?"The formula for magnification is m=h(i)/h(o)=-d(i)/d(o). m is the total magnification; h(i) is the height of the image; h(o) is the height of an object; d(i) is the distance from the lens to the in focus projected image; d(o) is the distance of the object to the lens. The negative sign represents that the image is inverted."
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A stationary 10 kg object is located on a table near the surface of the earth. The coefficient of kinetic friction between the surfaces is 0.2. A horizontal force of 40 N is applied to the object.
Answer:
2.04m/s²
Explanation:
Complete Question
A stationary 10 kg object is located on a table near the surface of the earth. The coefficient of kinetic friction between the surfaces is 0.2. A horizontal force of 40 N is applied to the object. Find the acceleration of the object.
According to Newtons second law;
\sum F_x = ma_x
F_m - F_f = ma_x
Fm is the applied force
Ff is the frictional force
m is the mass
a is the acceleration
Substitute the given values
40N - nmg = 10a
40 - 0.2(10)(9.8) = 10a
40 - 19.6 = 10a
20.4 = 10a
a = 20.4/10
a = 2.04m/s²
Hence the acceleration of the object is 2.04m/s²
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4. Which of the following sets of EM radiation can harm your body cells?
a. Gamma ray, microwaves, infrared
b. Light, ultraviolet, x-ray
c. Microwaves, ultraviolet, infrared
d. Ultraviolet, x-ray, gamma ray
Answer:
a. Gamma ray, microwaves, infrared
3,000ml of an unknown liquid has a mass of 3 kg. What is its density?
Answer:
Ro = 1000 [kg/m³]
Explanation:
We must remember that density is defined as the relationship between mass and volume.
[tex]Ro=m/V\\[/tex]
where:
Ro = density [kg/m³]
m = mass = 3 [kg]
V = volume = 3000 [ml]
We must convert the volume of milliliters to cubic meters
[tex]3000[ml]*\frac{0.001Lt}{1ml}*\frac{1m^{3} }{1000Lt} = 0.003m^{3}[/tex]
Now replacing:
[tex]Ro=3/0.003\\Ro=1000[kg/m^{3} ][/tex]
what is the difference between speed and velocity?
Explanation:
The reason is simple. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
If an object travels 230 km in 4 hours, what was the speed of the object? (speed = distance/time)
Answer:
Can you explain this?
Explanation:
Can you explain this?
Read the experiment setup. Then, match the components of the experiment with the type of variable.
Marcy is doing an export lent on the effect of fertilizer on plant growth. She grows 30 pots of radishes. 10 pots receive fertilizer A, 10 pots receive fertilizer B, and 10 pots receive no fertilizer. She grows all the pots in the same location and gives them the same amount of water
a. ___: fertilizer
b. ___: plant growth
c. ___: growing in same location, water, type of plant (radish)
1. Independent variable
2. Dependent variable
3. Controlled variable
What is the cost of operating a 100 W light bulb for "4 hrs per day" for 30 days, if the cost of electricity is 6 cents kW•h
Answer:
the cost of operating the light bulb is 72 cents.
Explanation:
Given;
cost of electricity, C = 6 cents / kW.h
power of light bulb, P = 100 W
time of light power consumption, t = 4 hours per day for 30 days
total time = 4 hours x 30 = 120 hours
Power consumed by the light bulb is calculated as;
P = 100 x 120 = 12000 w.h = 12 kW.h
Cost of power consumption = 6 cents/kWh x 12 kWh
= 72 cents
Therefore, the cost of operating the light bulb is 72 cents.
If you are in a car and your sibling is driving in the same car next to you at the same speed, does your brother appear to be moving?
Answer:
yes, because you guy's are moving in a car. because if you think about it, your parents are driving, but the cars moving so basically you guys would be moving.
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No your brother would appear to be stagnant ( i.e. Not moving )
Given that your brother is driving next to you at the same speed he would appear to be stagnant ( not moving ) to you.
When the basic factors of motion which are ;
Acceleration, Speed, Distance andTime of takeoffAre the same the objects operating at the same factor values would appear not to be moving to each other.
Therefore we can conclude that your brother would appear to be stagnant to you ( i.e. Not moving )
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what is inertia and how is it related to the newton's first law of motion?
Answer:
Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.
Explanation:
Some sort of a local field, maybe not our A field, is really the cause of inertia. When you push on an object a gravitational disturbance goes propagating off into either the past or the future. Out there in the past or future the disturbance makes the distant matter in the universe wiggle.
What does the structure labeled A represent in the model of the human brain below?
Answer:D blood vessels
Explanation:
Answer:
D
Explanation:
just took the quiz
A vacuum cleaner has a rating of 460 W on 230 V mains. The value of the fuse connected in the plug will be
Answer:
2 amps
Explanation:
Given data
Power = 460W
voltage= 230V
Required
The amperage/ current of the fuse
Recall P= IV
I= P/V
I= 460/230
I=2 amps
Hence the current of the fuse is 2 amps
Wich pair of factors affects the force of gravity between objects.
Answer:
Explanation:
Mass of the two objects effects gravity and so does the distance between them squared
why might you avoid opening a hot can of soda
Answer:
because im on a diet
Explanation:
Answer:
because.
Explanation:
Question 10 of 20 :
Select the best answer for the question.
10. Jamie is wiring a new outlet through a basement. She's run cabl
the wires to the new receptacle. What must she do next behore she pr
A. Mount the receptacles in the boxes.
B. Test the new circuit branch.
C. Turn on the current to test voltage.
D. Perform a continuity test to test for breaks in the conductor.
Mark for review (Will be highlighted on the review page)
Answer:
B. Test the new circuit branch.
Explanation:
I'm not sure and this is probably wrong, so please feel free to correct me.
Using technology is a great way to help motivate you and keep track of distances and times while fitness walking.
1. True
2. False
name the universal force of attraction that exists between masses
Answer:
gravity
Explanation:
Answer: gravity
Explanation: Newton's revolutionary idea was that gravity is universal - ALL objects attract in proportion to the product of their masses. Gravity is universal.
Get It? Explain Using the equation for translational kinetic energy,
show why a car moving at 20 m/s has four times the translational
kinetic energy of the same car moving at 10 m/s.
Answer:
[tex]K_1=4K_2[/tex]
Explanation:
Kinetic energy is given by
[tex]K=\dfrac{1}{2}mv^2[/tex]
m = Mass of object
v = Velocity of object
Here mass is constant so
[tex]K\propto v^2[/tex]
[tex]v_1[/tex] = Intial velocity of the car = 20 m/s
[tex]v_2[/tex] = Final velocity of the car = 10 m/s
[tex]\\dfrac{K_1}{K_2}=\dfrac{v_1^2}{v_2^2}\\\Rightarrow \dfrac{K_1}{K_2}=\dfrac{20^2}{10^2}\\\Rightarrow \dfrac{K_1}{K_2}=4\\\Rightarrow K_1=4K_2[/tex]
So, a car moving at 20 m/s has four times the translational kinetic energy of the same car moving at 10 m/s.
If I double the amount I stretch a spring, what happens to its EPE
A. Doubles
B. Halves
C. Quadruples
D. Quarters
An electrical generator creates electricity by
A) By spinning a turbine with kinetic energy
B) By using Gasoline
C) By exposing a coil of wire to a changing magnetic field
D) By Aligning the magnetic domains of the coil of wire
Why do you think spacecraft that carry instruments to collect data about objects in space are called probes?
Answer:
my mind cant comprehend a shing word u just said
Explanation:
The probes collect data, they capture the movement in space, therefore, spacecraft that carry instruments to collect data about objects in space are called probes, So the given statement is correct.
What are Probes?
Any conductor that is placed into a plasma and gathers current is a probe. Measurements of the current on the probe as a function of the bias potential given to the probe can be used to identify a plasma's properties.
Such probes affect their surroundings while directly detecting electron and ion flows in the plasma. Any conductive material (wire, foil, chamber walls, etc.) can serve as a plasma probe; nevertheless, precise control over the probe's size, shape, and substance is necessary to achieve detectable plasma levels. Astronauts are not present aboard probes. Scientists can analyze the data the probes relay back to Earth. Sputnik 1 was the first spacecraft to launch.
Because probes probably collect data, they capture the movement in space, therefore, spacecraft that carry instruments to collect data about objects in space are called probes.
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What should be the initial potential energy of a pile driver ram so that when it strikes piles, it delivers a kinetic energy of 20 KJ?
Answer:
the initial potential energy should be 20 kJ.
Explanation:
Based on law of conservation of energy, the kinetic energy delivered by the pile driver when it strikes the piles, should be equal to the initial potential energy.
Since the final kinetic delivered is given as 20 kJ, then the initial potential energy should be 20 kJ.
Therefore, the initial potential energy should be 20 kJ.
The primary job of a(n) ____
is to increase the power of a modified radio wave.
The primary job of a(n) ____
is to increase the power of a modified radio wave.
Answer:
amplifierExplanation:
Hope it helps:)
#CarryOnLearning
Answer: Amplifier
Explanation: Edge 2021
Have a great day :D
A ship is able to float on water because it's density is less than that of the water.
A. True
B.False
Answer:
A.True
A ship is able to float on water because It is less dense than the water.
What does an element's group number tell you about an element's chemical and physical properties ?
Describe the shape of a field created by a bar magnet
Answer:
its circular
Explanation:
PLEASE HELP BRANILIEST
The earliest goalie masks used were made from______________________.
Group of answer choices
Stone
Candy
Fiberglass
Wood
Answer:
The earliest goalie masks used were made from Fiberglass.
Explanation:
Hope that helps
Have a good day
I had to show a screenshot of this because brainly thinks it detects a bad word
which statements describe kinetic and potential energy? check all that apply.
Answer:
ACDE
Explanation:
Energy is generally described as the ability to do work by a body. There are two main forms of energy which are the kinetic energy and the potential energy.
Other energy forms stems from these two energy types.
Potential energy expressly deals with the position of a body. It is mathematically given as:Potential energy = mass x acceleration due to gravity x height
It is the energy stored based on the position of particles within a mediumThese description satisfies options A, C
Kinetic energy is the energy due to the motion of body. It is mathematically given as:Kinetic energy = [tex]\frac{1}{2}[/tex] x mass x velocity²
Also, kinetic energy is directly proportional to the velocity of a body.The description satisfies DE
The state of matter with particles that are not attracted or tightly packed
and are not arranged in a regular pattern; zoom around to easily change
shape and volume *
a.gas
b.liquid
c.solid
It's none of the above hope this helps
A basketball weighing 0.63 kg is dropped from a height of 6.0 meters onto a court. Use the conservation of energy equation to determine the velocity of the ball at a height of 2.0 meters above the court.
Answer:
The velocity of the ball at a height of 2.0 meters above the court is approximately 8.85 m/s
Explanation:
The given parameters of the ball are;
The mass of the ball, m = 0.63 kg
The height from which the ball is dropped, h₁ = 6.0 meters
The height at which the velocity of the ball is sought, h₂ = 2 meters
The initial potential energy of the ball, P.E. = m·g·h₁ = 0.63 × 9.8 × 6.0 = 37.044
The initial potential energy of the ball, P.E.₁ = 37.044 J
The potential energy of the ball, when the ball is at 2 meters above the court, P.E.₂ = m·g·h₂ = 0.63 × 9.8 × 2.0 = 12.348
The potential energy of the ball, when the ball is at 2 meters above the court, P.E.₂ = 12.348 J
From M.E> = P.E. + K.E.
Where;
M.E = The total mechanical energy of the ball = Constant
P.E. = The potential energy of the ball
K.E. = The kinetic energy of the ball
By the conservation of energy principle, we have;
The potential energy lost by the ball = The kinetic energy gained by the ball
The potential energy lost by the ball = P.E.₁ - P.E.₂ = 37.044 - 12.348 = 24.696
The potential energy lost by the ball = 24.696 J
The kinetic energy gained by the ball = 1/2·m·v² = 1/2×0.63×v²
Where;
v = The velocity of the ball
∴ The potential energy lost by the ball at 2.0 meters above the court = 24.696 J = The kinetic energy gained by the ball at 2.0 meters above the court = 1/2×0.63×v²
24.696 J = 1/2×0.63 kg ×v²
v² = 24.696 J / (1/2×0.63 kg) = 78.4 m²/s²
∴ v = √(78.4 m²/s²) = 8.85437744847 m/s
The velocity of the ball at a height of 2.0 meters above the court, v ≈ 8.85 m/s.
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How could you explain that two objects of the same volume have different buoyancy in water???
HELP ITS URGENT
Answer:
Explanation:
Take for example you place two eggs in the water. One starts to sink and one remains floating. They have the same volume but the one that sinks is cracked just a little, which as soon as it hits the water, water starts to go in the egg. Then that changes the volume of the egg. (I've done this expirement before) It can also be the way you place the object in the water, or one object has been in the water longer. The buoyancy can be the way they are positioned/placed in the water. One may be more absorbant to the water as well.
I hope you understand what I am trying to say.