1) Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.) A) The image of the object will always be smaller than the object. B) No matter where you place the object, a real image of the object will be formed. C) The image of the object will always be inverted. D) If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. E) No matter where you place the object, the image of the object will always be virtual and upright.
Answers
Answer:
C
Explanation:
because the concave mirror is always inverted
d ) when object is between focus and mirror , image formed is always virtual and erect
What is a Concave mirror ?
A concave mirror has a reflective surface that is curved inward and away from the light source .
a) Incorrect because image can be equal to , smaller then , and bigger then the object
b) and c) Incorrect when object is between focus and mirror , image formed is virtual and erect
d ) Correct option when object is between focus and mirror , image formed is always virtual and erect
e) Incorrect except one case in all other cases nature is real and inverted
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Related Questions
Based on the Law of Conservation of Energy, which of the below is true?(1 point)
A. Kinetic energy is always equal to potential energy.
B. Kinetic energy is equal to potential energy minus temperature.
C. Potential energy is equal to thermal energy plus kinetic energy.
D. Energy cannot be created or destroyed by ordinary chemical or physical means.
Answers
_______________________________________________________
Based on the 'Law of Conversation of Energy', potential energy is equal to thermal energy plus kinetic energy.
In summary - Option C is correct
________________________________________________________
Hope this helps!
The conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.
What is a conservation of energy?The conservation of energy refers that the total energy present in an isolated system remains constant. It means that a system itself can not generate or consume energy. Energy actually transferred from one form to another.
Conservation of energy: tell us that energy can neither be created nor destroyed, but can be transferred from one form to another. e.g Chemical to mechanical ( combustion of fuel in the vehicle to achieve mechanical work.
The conservation of energy is defined by the first law of thermodynamics. Which states that we can not generate energy or can not destroy energy but only can transfer it from one form to another. Like chemical to heat, Kinetic to potential, etc.
Therefore, the conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.
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Which is a factor that keeps Earth in orbit around the sun
Answers
Answer:
Gravity
Explanation:
Newton contributions
Which of the following characteristics do all unicellular organisms share?
Answers
Answer:
Asexual production they can be eukaryotes or prokaryotes
Explanation:
Which of the following best explains why energy transfers are never 100%
efficient?
A. Some energy is always converted to unusable forms in the
process.
B. Some energy is always destroyed in the process.
C. Entropy always decreases in an energy transfer.
D. Energy is always conserved in an energy transfer.
Answers
Answer:
A. Some energy is always converted to unusable forms in the
Explanation:
The second law relates to the quality of energy. This law states that whenever energy is transformed, some of must be degraded into a less useful form. In ecosystems, the biggest losses occur as respiration.
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why is it easier to stop a lightly loaded truck than a heavier one that has equal speed?
Answers
It is easier to stop a lightly loaded truck than a heavier one with equal speed due to the concept of inertia and the relationship between mass and momentum.
Inertia is the tendency of an object to resist changes in its state of motion. The greater the mass of an object, the greater its inertia. When a truck is in motion, it possesses kinetic energy and momentum.
When we apply brakes to stop a moving truck, we need to counteract its momentum. Momentum is the product of an object's mass and velocity and is a measure of how difficult it is to change the object's motion. The momentum of an object is directly proportional to its mass.
In the case of a heavily loaded truck, it has a greater mass compared to a lightly loaded truck. Consequently, it possesses a greater amount of momentum at the same speed. The greater momentum requires a greater force to stop the truck.
When braking is applied, the force of friction between the truck's tires and the road surface acts as the decelerating force. The force of friction is the same for both the lightly loaded and heavily loaded truck, assuming all other factors remain constant. However, the heavier truck has a greater resistance to changes in motion due to its higher mass and momentum. As a result, it requires a stronger and longer-lasting braking force to overcome its inertia and bring it to a stop.
In summary, the greater mass and momentum of a heavily loaded truck make it more challenging to stop compared to a lightly loaded truck with the same speed. The heavier truck's increased inertia necessitates a greater force to counteract its momentum and bring it to a halt.
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The helium that fills a balloon is an example of which state of matter? (1 point)
a
Solid
b
Liquid
c
Gas
d
Plasma
Answers
What does it cost to charge an electric car at a charging station?.
Answers
Answer:
A small car could cost about $11.50 to $23 to fully charge while a bigger or long-distance vehicle could cost between $22.50 to $45.
Explanation:
how can i stop loveing you if yo keep saying the things i want to hear
Answers
Answer:
....
Explanation:
Answer:
What do you mean.
Explanation:
The Round Up carnival ride below has a radius of 3.62 meters and rotates 0.537 times per second. As shown, riders can be held up by only friction. What coefficient of friction is needed to keep the riders from sliding down? Include units in your answer. Answer must be in 3 significant digits.
Answers
The free body diagram for the problem is shown below:
If the people don't slide down this means that the friction has to be equal to the Weight, then we have:
\(\begin{gathered} F_f-W=0 \\ F_f=W \\ \mu F_n=W \\ \mu=\frac{W}{F_n} \end{gathered}\)Now, from newton's second law we have that:
\(F_n=ma_c\)but
\(a_c=\frac{4\pi^2r}{T^2}\)then:
\(F_n=\frac{4\pi^2mr}{T^2}\)And then we have:
\(\begin{gathered} \mu=\frac{mg}{\frac{4\pi^2mr}{T^2}} \\ \mu=\frac{gT^2}{4\pi^2r} \end{gathered}\)Plugging the values given we have:
\(\begin{gathered} \mu=\frac{(9.8)(\frac{1}{0.537})^2}{4\pi^2(3.62)} \\ \mu=0.238 \end{gathered}\)Therefore the coefficient of friction is 0.238
Match each term on the right to the correct definition.
A boundary formed when two plates
move past each other
1.
A.
Ocean basin
B.
Divergent bounda
2
.
A valley or depression between
continents
c.
Transform
boundary
3.
A boundary formed when two plates
collide
D.
Convergent
boundary
A boundary formed when two plates
move away from each other
A
B
С
D
II. Identification
Use the clues provided to fill in the blanks.
Answers
Answer:
Explanation:
C goes to 1
D goes to 3
B goes to 4
A goes to 2
If you are bringing a plane mirror towards
your face of right angle to your face with a
Speed of soms at what rate image is the
image approaching?
Answers
What the relationship between frequency and wavelength of electromagnetic radiation? choose. If you double the wavelength of light, what happens to the energy of the photons? choose. Which has a greater energy, long wavelength red light or short wavelength uv light? choose.
Answers
Frequency is inversely proportional to the wavelength of electromagnetic radiation.
When the wavelength of light is doubled, the frequency is reduced to its original value.
Short wavelength UV (ultraviolet) light will have more energy.
What is meant by wavelength?The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal propagated in space or along a wire is defined as the wavelength.
The relationship between frequency of electromagnetic radiation and wavelength of radiation is:
ν==1/λ
Where,
ν= frequency
As a result, the frequency of electromagnetic radiation is inversely proportional to its wavelength.
The frequency is reduced to its original value when the wavelength of light is doubled.
The energy of a photon is proportional to the frequency of light.
Using Relationship,
E=hν=h c/λ
h = Planck's constant
c = speed of light
Both h and c are constants
As a result, energy will be reduced to its initial value.
The light with the shortest wavelength will have the greatest energy.
UV (ultraviolet) light with a shorter wavelength has more energy.
It is because of the previously stated relationship..
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5-19 At a certain location, the wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 70−m diameter blades at that location. Also, determine the actual electric power generation assuming an overall efficiency of 30%. Take the air density to be 1.25 kg/m3.
Answers
The mechanical energy of air per unit mass is 50 J/kg, the power generation potential of a wind turbine with 70−m diameter blades is 1.5 × 10⁷ J/s, and the actual electric power generation assuming an overall efficiency of 30% is 4.5 × 10⁶ J/s
Given, the wind velocity, V = 10 m/sRadius, r = 70/2 = 35mDensity of air, ρ = 1.25 kg/m³The formula to calculate the mechanical energy of air per unit mass is given by:Mechanical energy per unit mass (E) = (V²)/2Mechanical energy per unit mass (E) = (10²)/2 = 50 J/kg.
The formula to calculate the power generation potential of a wind turbine with 70−m diameter blades is given by:Power generation potential of wind turbine (P) = (1/2) ρ A V³Power generation potential of wind turbine (P) = (1/2) × 1.25 × π × (35)² × 10³Power generation potential of wind turbine (P) = 1.5 × 10⁷ J.
The actual electric power generation assuming an overall efficiency of 30% is given by:Electric power generation (E) = 0.3 × Power generation potential of wind turbineElectric power generation (E) = 0.3 × 1.5 × 10⁷Electric power generation (E) = 4.5 × 10⁶ J/s.
Therefore, the mechanical energy of air per unit mass is 50 J/kg, the power generation potential of a wind turbine with 70−m diameter blades is 1.5 × 10⁷ J/s, and the actual electric power generation assuming an overall efficiency of 30% is 4.5 × 10⁶ J/s.
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It takes more time to find a value in a hash table data structure than to find a value in a doubly linked list data structure. True or False
Answers
False.In a hash table data structure, the time complexity for finding a value (retrieving an element) is typically O(1) on average, assuming a good hash function and a well-distributed set of keys. This means that the time it takes to find a value is constant, regardless of the size of the data structure.
On the other hand, in a doubly linked list data structure, finding a value requires traversing the list from the beginning or end until the desired value is found. The time complexity for finding a value in a doubly linked list is O(n), where n is the number of elements in the list. This means that the time it takes to find a value in a doubly linked list increases linearly with the size of the list.Therefore, it takes more time to find a value in a doubly linked list data structure compared to a hash table data structure.
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A go cart with a mass of 60 kg is moving at a rate of 10 m/s. How much Kinetic Energy does the go cart have?
Answers
Answer:
3000 JExplanation:
The kinetic energy of an object can be found by using the formula
\(k = \frac{1}{2} m {v}^{2} \\ \)
m is the mass in kg
v is the velocity in m/s
From the question
m = 60 kg
v = 10 m/s
We have
\(k = \frac{1}{2} \times 60 \times {10}^{2} \\ = 30 \times 100 \\ = 3000\)
We have the final answer as
3000 JHope this helps you
Answer:
\(\boxed {\boxed {\sf 3000 \ J}}\)
Explanation:
Kinetic energy is the energy an object has due to motion. It is calculated using the following formula:
\(KE=\frac{1}{2} mv^2\)
The mass of the go-cart is 60 kilograms and the velocity is 10 meters per second.
m= 60 kg v= 10 m/sSubstitute the values into the formula.
\(KE= \frac{1}{2} (60 \ kg)(10 \ m/s)^2\)
Solve the exponent.
(10 m/s)² = 10 m/s * 10 m/s = 100 m²/s²\(KE = \frac{ 1}{2} (60 \ kg)(100 \ m^2/s^2)\)
Multiply the numbers together.
\(KE= 30 \ kg * 100 \ m^2/s^2\)
\(KE= 3000 \ kg*m^2/s^2\)
Convert the units. 1 kilogram meter squared per second squared is equal to 1 Joule, so our answer of 3000 kg*m²/s² equals 3000 Joules.
\(KE= 3000 \ J\)
The go-cart has 3000 Joules of kinetic energy.
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Explain how UY Scuti and J0523 are different.
Why will J1311 (the Black Widow Pulsar) eventually find itself without its companion star? How will this happen?
How did scientists determine SM0313 is the oldest star ever discovered?
What characteristics of HV2112 make it the best candidate to be classified as a Thorne-Zytkow object?
How does a star's mass determine its lifespan?
Discuss the characteristics of cool red dwarf stars, including their mass and age.
Discuss the correlation or connection between stars with a higher mass and the amount of fuel they have to work with.
How old is the sun and since its birth, how has the sun changed?
During its lifespan, what characteristics of the sun will change?
Answers
Answer:
(3rd Question about the Black Widow Pulsar)
J1311 is a fast spinning neutron star, which means it emits strong beams of radiation from it's poles.
As the beam of the pulsar sweeps across the surface of the companion star, it heats it up and blows its material outward into space, thus decreasing its mass.
Kenitic Energy (KE)
1.doubled
Answers
Answer:
mass
Explanation:
This energy of motion is what we call kinetic energy. ... In fact, kinetic energy is directly proportional to mass: if you double the mass, then you double the kinetic energy. Second, the faster something is moving, the greater the force it is capable of exerting and the greater energy it possesses.
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What does Newton's second law describe?
A. How inertia affects the motion of an object
B. The relationship between force, mass, and acceleration
C. Action-reaction pairs
D. How friction and the normal force are related
Answers
It is important to be careful when using nonrenewable resources because
A
there is a limited supply of them and we can’t make any more.
B
harnessing their energy is a very dangerous process.
C
they are more likely to produce excess thermal energy that we can’t use.
D
there is a possibility of finding dinosaur bones in petroleum or coal deposits.
Answers
Answer:
The answer is A because it is a resource that takes many many years to make more of and we cannot make it ourselves
gendo is driving a car at 20 m/s when he suddenly slams on the brakes, locking the wheels. the coefficient of kinetic friction between the tires and the road is 0.84. what is the speed of the car 1.4 seconds after he slams on the brakes? ignore air resistance
Answers
The heat and pressure generated when slamming on the brakes can cause tears and cracks in the hoses.
Sliding friction is defined as the force acting between moving surfaces. An object moving on a surface experiences a force opposite its direction of motion. The force magnitude depends on the dynamic friction coefficient between the two materials.
Static friction prevents the box from moving without being pushed. It must be overcome with sufficient reaction force before the box can move. Kinetic friction is the force that resists the relative motion of surfaces when they begin to move.
Sliding friction is also called kinetic friction because it occurs between two surfaces rubbing against each other. Sliding friction is caused by the entanglement of surface irregularities.
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the need for sustainable energy resources ??
Answers
Answer:
Sustainable energy is essential to meet uncontrolled rising demand for energy, reduce pollution and shift to resources that can be used again and again.
Explanation:
Considering the Sustainable Goals floated by United Nation, it is essential for all countries to improve their score in all the SD goals.
One of the SD goal is to shift to sustainable energy.
Sustainable energy is essential from following three points
- Reuse of energy source again and again to outcome the fear of resource depletion
- Sustainable energy source shall ensure cleaner environment
- Sustainable energy sources are also essential to meet the rising consumption of energy with time all across the globe.
Some common examples are - Solar energy, Wind Energy, Energy from nuclear fuels etc.
Nuclear power plant meltdowns can be hazardous. Which of these is a result
related to the meltdown of a nuclear power plant?
O significant changes in sea level in the region
O change in weather conditions in a widespread area
O increased production in carbon dioxide as air pollution
O dangers to the health of people and the environment Science
Answers
A 61.7 kg carpenter at a construction site plans to swing in a circular arc from one roof top to an adjacent roof at the end of a 11.5 meter rope suspended from a crane boom. if her wiry arms, toughened by years of driving spikes with a no. 22 framing hammer, are capable of exerting 1229 n of force on the rope, what is the maximum speed that she can tolerate at the low point of her swing?
Answers
At the lowest point of her swing, she can withstand a maximum speed of 10.78 m/s.
Given that,
Mass of the carpenter = 61.7 kg
Length of the rope = 11.5 m
Capable force = 1229 N
Centripetal force acting on the body,
F = mv²/r = (61.7× v²)/11.5 = 5.37 v²
Gravitational force acting on her is
F = m × g = 61.7 × 9.81 = 605.28 N
By summing up gravitational and centripetal forces to get the total available force,
5.37 v² + 605.28 = 1229
5.37 v² = 623.72
v² = 116.15
v = 10.78 m/s
Hence, the maximum speed at the low point of her swing is 10.78 m/s.
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which of the following statements about stars is true?; if the sun is white-yellow, which of the following is a reasonable approximation of its temperature?; immediately above the sun's photosphere is the _______, which is the sun's lower atmosphere.; which of the following statements about the sun is true?; which of the following lists stars in order of increasing size?; betelgeuse star
Answers
From around 6500 K at the bottom to 4000 K at the top, the photosphere's temperature changes (11,000 and 6700 degrees F, 6200 and 3700 degrees C). Granulation covers a large portion of the photosphere.
The results of these many techniques indicate that the Sun's surface actually has a temperature of about 5,800 kelvin (9,980 degrees Fahrenheit [5,520 degrees Celsius]). The photosphere contains areas of darkness known as sunspots, where the temperature is comparatively lower—about 3800K. The photosphere is therefore the layer that is the coldest. It is 15 million K inside the sun (27 million degrees Fahrenheit). It is 5780 K at the surface (9900 degrees Fahrenheit).
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It is difficult to lift a Large stone but easy to lift a smaller one on the surface of the earth .why ?
Answers
Answer:
the weight of the large stone is greater than a small one
Explanation:
because the large stone has greater mass then the small stone.therefore it is difficult to lift the large stone on the surface of the earth but easy to lift the small one
If you are inside a car and the car is struck by lightning, it is best to stay inside because the electric field inside the car is ________?
Answers
Answer:
Get out if the car
Explanation:
Get out of the car because the car could explode by over eclectic power
get out of the car as fast as possible
3. A train covers 168 km in 4 hours. How much distance will it cover in 80
minutes?
Answers
Answer:
56km
Explanation:
168 ÷ 240 = 0.7
0.7 × 80 = 56km
240 is the amount of minutes in 4 hours.
We divided 168 by 240 to get the distance covered in 1 minute. Afterwards, we needed 80 minutes so we multiplied the answer by 80.
5. Explain what happens to the frequency that a
person at point A hears as compared to the original
frequency.
The
Answers
The frequency that a person at point A hears will change if the sound source is moving relative to the person. This is known as the Doppler effect.
What is the Doppler effect?The term "Doppler Effect" describes the shift in wave frequency that occurs when a wave source and its observer move in relation to one another.
If the sound source is moving towards the person, the frequency will appear higher (known as a blue shift) and if the sound source is moving away from the person, the frequency will appear lower (known as a red shift). If the sound source is not moving relative to the person, the frequency heard will be the same as the original frequency.
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10 points whats an average height for a egg drop? 20m or what?
Answers
Answer:
Egg Drop Challenge height
The containers will be dropped from an initial height of about 11.5 ft. The second and final drop will be from the second floor (about 19.5 ft).
Explanation:
A 200 kg object is initially at rest on a horizontal frictionless surface. At time t = 0 , a horizontal force of 100 N applied to the object for and then removed. Which of the following is correct about object's motion at time t=2 s?
(A) It is at rest.
(B) It is moving with decreasing acceleration.
(C) it is moving with decreasing speed.
(D)it moving at a constant speed.
(E) It is moving with increasing speed
Answers
Answer:
b
Explanation: