Explanation:
A mirror with a surface that is either concave or convex and forms a portion of a true sphere.
Answer:
Spherical Mirror:Definition:
A mirror whose polished, reflecting surface is a part of a hollow sphere of either glass or plastic is called a spherical mirror.Types:
There are 2 types.Concave MirrorConvex MirrorExplanation:
In a spherical mirror, one of the two curved surfaces is coated with a thin layer of silver followed by the coating of lead oxide. One side of the mirror is opaque while the other side is highly reflecting which acts as a mirror.Jon was happily riding his bike at a velocity of 12 m/s North, he soon realized he was late and increased his velocity to 24nm/s in the same direction in 6 seconds. What was his acceleration?
Answer:
2 m/s^2
Explanation:
acceleration formula: a=(v-v0)/t
a=(24-12)/6=2
why is it wrong to say a single object all alone is moving
Answer:
It is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.
Explanation:
From Newton's law of inertia, it states that: An object at rest or in constant motion will continue in it's present state unless it is acted upon by an external force.
Which means that a single object by itself cannot move anywhere unless it is acted upon by an external force..
Thus, it is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.
If a system is maintained at a pressure of 2 psi of vacuum, what is the pressure in psia (lbs per square inch absolute)
Answer:
The absolute pressure of the system is 12.7 psia.
Explanation:
Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:
[tex]p_{abs} = p_{atm} - p_{vac}[/tex]
Where:
[tex]p_{abs}[/tex] - Absolute pressure, measured in pounds per square inch.
[tex]p_{atm}[/tex] - Atmospheric pressure, measured in pounds per square inch.
[tex]p_{vac}[/tex] - Vacuum pressure, measured in pounds per square inch.
Given that [tex]p_{atm} = 14.7\,psia[/tex] and [tex]p_{vac} = 2\,psia[/tex], the absolute pressure of the system is:
[tex]p_{abs} = 14.7\,psia-2\,psia[/tex]
[tex]p_{abs} = 12.7\,psia[/tex]
The absolute pressure of the system is 12.7 psia.
Three quarterbacks challenged each other to a throwing competition. They want to see who can throw the ball the furthest. What SI unit would be most appropriate to measure the competition? Question 1 options: Celsius Gram Meter Liter
Answer:
Meter
Explanation:
The competition between the three quarterbacks is with respect to how far the ball would be thrown by each person, which is the distance covered by the ball. The thrown ball is an example of projectile, which would move over a certain distance.
With respect to the measure to be used in the competition, the appropriate SI unit is meter. This is the measure of length or distance covered.
what is the power in a circuit with a voltage of 120 V and a resistance of 50
Answer:
288W.
Explanation:
P = IV = V^2 / R = (120)^2 / 50 = 288W.
The flow of air from an ocean or lake to the land is called a ___________________________.
Maybe sea or onshore breeze
It develops due to the difference of air pressure greater by the different temperature of the water and land
Does a free falling object fall 2 meters in twice the time as it falls 1 meter?
a. Yes, it takes twice as long to fall twice as far. b. Yes, it takes longer to fall farther.
c. No, since it is speeding up as it falls it will cover the same distance in a shorter time.
d. No, it takes the same time since it does not accelerate.
A free-falling object has a consrant force acting on it . . . the force of gravity, or what technical experts refer to as its "weight".
Since the object has a constant force acting on it, it must constantly accelerate according to Newton's 2nd law of motion. The way this acceleration reveals itself, the object's speed is constantly increasing.
Since the object is speeding up as it falls, there are a few weird things that happen:
-- It will fall 2 meters in less than double the time for 1 meter.
-- It will fall 3 meters in less than triple the time for 1 meter.
-- It will fall 4 meters in less than quadruple the time for 1 meter, and less than double the time for 2 meters.
-- It will fall 1 meter near the bottom in less time than 1 meter near the top.
None of the choices exactly answers the question.
Choices ' a ' and ' d ' are false statements.
Choice-b is a true statement, but it isn't a "Yes".
Choice-c is kind of confused, but is probably the one you should select.
If the force of gravity _____ the weight of an object will ______.
A. Decrease, increase
B. Increase, increase.
C. Increase, stay the same D. Decrease, stay the same
Answer:
the answer is c
Explanation:
because if the force of gravity increases its not gonna change its weight it will just float
Answer:
B
Explanation:
Weight is the amount of force gravity is exerting on something, so if gravity's force increases, weight would increase as well
A ball of moist clay falls 17.3 m to the ground. It is in contact with the ground for 24.0 ms before stopping. (a) What is the average acceleration of
Answer:
Acceleration, [tex]767.08\ m/s^2[/tex]
Explanation:
Given that,
Height from a ball falls the ground, h = 17.3 m
It is in contact with the ground for 24.0 ms before stopping.
We need to find the average acceleration the ball during the time it is in contact with the ground.
Firstly, find the velocity when it reached the ground. So,
[tex]v^2=u^2+2ah[/tex]
u = initial velocity=0 m/s
a = acceleration=g
[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 17.3} \\\\v=18.41\ m/s[/tex]
It is in negative direction, u = -18.41 m/s
Let a is average acceleration of the ball. Consider, v = and u = -18.41 m/s.
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{0-18.41}{24\times 10^{-3}}\\\\a=767.08\ m/s^2[/tex]
So, the average acceleration of the ball during the time it is in contact is [tex]767.08\ m/s^2[/tex].
A space ship to the moon covered the 216,000 km in 72 hours. What was it’s average velocity
Answer:3000km/h
Explanation:
speed=distance/time
216,000km/72hrs
=3000km/h
Well, first of all, if there are astronauts aboard that ship, I hope they don't try to climb out yet. If they pointed straight at the moon and covered 216,000 km so far, they still have another 168,000 km to go before they get there.
Average Speed = (distance) / (time)
Speed = (216,000 km) / (72 hours)
Average Speed = 3,000 km/hr
also
Speed = (216,000 km) x (1000m/km) / (72 hr x 3600sec/hr)
Average Speed = 833.33 m/s
There's not enough information given to find the ship's velocity.
why are coal,nuclear,oil,and natural gas determined to be non-renewable types of energy resources
Answer:
Once used as a energy source they cannot be charged/used again.
Explanation:
3.
In some countries, pedestrians attach reflective strips to their clothes or bags when they walk
outside during the night. Why do you think the pedestrians use these reflective strips?
Answer:
I think they use it at night because they want to avoid involving themselves in road accident while crossing the street. When there are reflective strips on their clothes, drivers do notice them even at far ends of the street since the strips will reflect the rays from the car lights to the driver,hence, the driver notifies that there is a pedestrian crossing and therefore slows down.
What is the difference between centripetal force and centrifugal force???
Answer:
While centripetal force focuses towards the centre of a rotating path, the centrifugal force is just opposite to this, meaning it exerts a force to liberate a body from ...
Centripetal force is an inward force and centrifugal force is an outward force.
Centrifugal force is often referred to as inertial force or fictitious force.
More items...
Explanation:
How do mirrors
work?
Answer:
the light relflects off them and creates a image
Answer:
When photons - rays of light - coming from an object (your smiling face, for example) strike the smooth surface of a mirror, they bounce back at the same angle. Your eyes see these reflected photons as a mirror image.... If a smooth surface absorbs the photons, they can't bounce back and there will be no reflection.
Explanation:
*Hope this helps*
How does the moon’s diameter compare with the distance between earth and the moon
Kim took 5 hours to complete a journey with an average speed
of 80 km/h. For the first 3 hours, she travelled at an average
speed of 60 km/h. What was her average speed for the
remaining time of the journey?
km
Answer:110
Explanation:
16. Which of these provides most of the oxygen in Earth's
atmosphere?
coral reefs
rainforest plants
ocean phytoplankton
continental grasslands
Answer:
Ocean phytoplankton
Explanation:
The sea and ocean creates oxygen from the plants (sea creatures) that exist there. These plants generate oxygen when used as a-product of photosynthesis, a mechanism that transforms carbon dioxide through sunlight into carbohydrates that the body(plants) can use for nutrition.
suppose you use three different scales to weigh bag of oranges one scale says the bag weighs 2.1 lbs a second says it weighs 2.2 lbs and a third says it weighs 2.1 lbs the actual weight of the bag of oranges is 2.153 lbs which of the following best describes the results?
Answer:
It would be 2.2 if you have to round the five to the one but if your not rounding the number, it'd be 2.1.
Explanation:
A student observes that for the same net force heavier objects accelerate less which statement describes the correct conclusion?
There is a negative correlation between mass and acceleration.
An increase in acceleration causes the mass to increase.
A decrease in acceleration causes the mass to increase.
There is a positive correlation between mass and acceleration
Answer: A decrease in acceleration causes the mass to increase.
Explanation:
Let's rewrite this as:
"For a constant force F, we can see that heavier objects accelerate less"
Then, as the mass increases, the acceleration of the object decreases.
This is known as an inverse relationship between acceleration and mass.
By second Newton's law we have that:
F = m*a
Force equals mass times acceleration.
So if the force is constant, we can write it as:
a = F/m.
In this equation, we can see that, if the acceleration decreases and F remains constant, then the mass m must increase (because it is in the denominator)
Then the correct option is:
A decrease in acceleration causes the mass to increase.
Answer:
There is a negative correlation between mass and acceleration.
Explanation:
Facundo is wrong. I got this wrong thanks to Facundo!
Do you think all substances can change into a solid,liquid or gas?
Answer:In short yes in long
Explanation:yes all substances can exist in any of these three states. In addition to existing in one of the three states, matter can also undergo a change of state. A change of state occurs when matter is converted from one state to another state for example when a liquid is converted to a gas or a solid is converted to a liquid.
Which steps can you take to help a person suffering from achohol abuse?
Answer:
Call a treatment service. Seek out a healthcare professional. Lastly, report the issue to the local authorities.
Why did I choose these?
You call the treatment services to take care of the person.
You seek out a healthcare professional to get him/her back in shape.
Then you report the issue so that nobody will be endangered by the person that is abusing alcohol. Many accidents occur because of this and that is why you report it.
Explanation:
Social science is a branch of science that deals with the nature of
A. human society
B. the physical world
C. animal societies
D. the medical field
Please select the best answer from the choices provided
А
B
A whale swims at a constant speed of 8m/s for 17s what distance did it travel
We have,
Speed = 8 m/s
Time = 17 seconds
Now,
Speed = Distance/Time
★ Substituting the values in the above formula,we get:
⇒ 8 = Distance/17
⇒ Distance = 8 × 17
⇒ Distance = 136 m
Hence,the distance covered by a whale is 136 m .
a person runs 27.0km west then turns around and runs 13.0km east what's the distance and displacement ?
Answer:
See below
Explanation:
Distance = 27 + 13 = 40 km
Displacement = 27 - 13 = 14 km
A glass plate 2.25 mm thick, with an index of refraction of 1.80, is placed between a point source of light with wavelength 620 nm (in vacuum) and a screen. The distance from source to screen is 1.50 cm. How many wavelengths are there between the source and the screen?
Answer:
There are 2.71x10⁴ wavelengths between the source and the screen.
Explanation:
The number of wavelengths (N) can be calculated as follows:
[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]
Where:
[tex]d_{g}[/tex]: is the distance in glass = 2.25 mm
[tex]d_{a}[/tex]: is the distance in air = 1.50 cm - 0.225 cm = 1.275 cm
[tex]\lambda_{g}[/tex]: is the wavelength in glass
[tex]\lambda_{a}[/tex]: is the wavelength in air = 620 nm
To find the wavelength in glass we need to use the following equation:
[tex] n_{g}*\lambda_{g} = n_{a}*\lambda_{a} [/tex]
Where:
[tex]n_{g}[/tex]: is the refraction index of glass = 1.80
[tex]n_{a}[/tex]: is the refraction index of air = 1
[tex] \lambda_{g} = \frac{\lambda_{a}}{n_{g}} = \frac{620 nm}{1.80} = 344.4 nm [/tex]
Hence, the number of wavelengths is:
[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]
[tex] N = \frac{2.25 \cdot 10^{-3} m}{344.4 \cdot 10^{-9} m} + \frac{1.275 \cdot 10^{-2} m}{620 \cdot 10^{-9} m} [/tex]
[tex] N = 2.71 \cdot 10^{4} [/tex]
Therefore, there are 2.71x10⁴ wavelengths between the source and the screen.
I hope it helps you!
What is a common misconception/mistake made when calculating the final velocity for a falling object
Answer:
Velocity (v) can be calculated via v = gt, where g represents the acceleration due to gravity and t represents time in free fall. Furthermore, the distance traveled by a falling object (d) is calculated via d = 0.5gt^2.
1. The Coulomb force between two charges q1 and q2 at separation r in air is F. If half of the separation is filled with medium of dielectric constant 9, what will be the value of new coulomb force? 2.There are two large parallel metallic platesP1 and P2 carrying surface charge densities σ1 and σ2(σ1> σ2) respectively, placed at some distance d apart in vacuum. Determine the work done by the electric field in moving a point charge q from P1 to P2 along a line a (a
Answer:
Explanation:
1 )
F = k q₁q₂ / r² where k = 9 x 10⁹
So force F₁ = [tex]\frac{kq_1q_2}{(\frac{r}{2}+\frac{\sqrt{9} r}{2})^2 }[/tex]
= [tex]\frac{kq_1q_2}{(\frac{r}{2}+\frac{3 r}{2} )^2 }[/tex]
= k q₁q₂ /4 r²
F₁ = F / 4
2 ) Electric field due to charge density σ
= σ / ε₀
So net electric field between the plates
= ( σ₁ - σ₂ ) / ε₀
Force on charge q
= ( σ₁ - σ₂ ) q / ε₀
work done = force x displacement
= ( σ₁ - σ₂ ) x q x d / ε₀
Which situation shows potential energy transforming into kinetic energy 1.A car stopped at a stoplight 2.A flowerpot falling from a balcony 3.A cow standing in a field 4.A bicycle slowing down
Answer:
2.A flowerpot falling from a balcony
Explanation:
Potential energy is the internal energy within a body at rest or at a height above the ground. In this case of the falling flowerpot, the flowerpot initially has a potential energy due to its position on the balcony above the surface of the earth. As the flowerpot falls, the work done against gravity in taking the flowerpot to this height on the balcony (equivalent to the potential energy) is transformed into the kinetic energy of motion as the flowerpot falls down through the height.
two decimals that are the same as 7.7
Answer:
7.70
7.700
Explanation:
We can simply add zeros behind the significant figures and they would still be equivalent to 7.7
Use the drop-down menus to complete each sentence.
The force applied to the physics cart is manipulated
Answer:b
Explanation: