Answer:
False
Explanation:
If I am not mistaken reflection is when light bounces off of a surface such as snow,water,glass ect. and refraction is when,the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density?
ned
An object is placed (90 cm) from a convex lens whose focal length is
(30cm). What is the image position (xi)?
Answer:
45 cm
Explanation:
The formula to apply in this question is that of object distance , image distance and focal length.
This is written as;
[tex]\frac{1}{f} =\frac{1}{o} +\frac{1}{v}[/tex]
where;
f= focal length = 30cm
o= object distance = 90 cm
v= image distance = ?
Applying real values as;
1/30 = 1/90 + 1/v
1/30 - 1/90 = 1/v
1/45 = 1/v
v= 45 cm
You leave Chicago, Illinois at 8am and fly to Portland, Oregon. Your flight takes 2.5 hours. What time do you arrive in Portland?
Answer:
10:30am ........................
Answer:
maybe around 10:30 I would say
calculate the efficiency of a machine if the input work is 200J and the output work is 150J.
Answer:
75% is the efficency of this maxhine
What are atoms and elements?
Answer:
Atom, smallest unit into which matter can be divided without the release of electrically charged particles.
an element is a pure substance which cannot be broken down by chemical means
Answer: atoms and elements?) ... A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
Explanation: atoms and elements?) ... A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
Which is true of oxidation? PLS HELP FAST and thank you!
Choices:
A it is a physical process
B no changes occur in the makeup of rock
C rocks weather at different rate
D water freezes in cracks in a rock
Answer:The Answer Is D
Explanation:
Critics of the electoral college argue that the system can result in the selection of —
Answer:
President who did not win the popular vote
Explanation:
Critics of the Electoral college argue that the system can result in a selection of what?
Can someone help me plz
plz ＞﹏＜ and hurry
Several kilometers from a volcano, a geologist observes an old lava flow made up of dark-colored basalt rock. The geologist infers that the lava must have had....
a. high silica content.
b. high viscosity.
c. low viscosity.
d. medium viscosity.
Answer: this is for you telling me what he did
Explanation: it D
Un cilindro de gas a 32 °C normalmente tiene una presión interna de 11 atm, sin embargo, la válvula de alivio se debería abrir antes de llegar a 19, 380 mmHg. ¿A qué temperatura es cuando la válvula se abre para liberar la presión interna?
Answer:
T₂ = 72ºC
Explanation:
In this exercise let us reduce the pressure to the SI system
P = 11 ata (1 10⁵ Pa / 1 atm) = 11 10⁵ P
y = 19380 mmHg
pressure is
P = ρ g h
P = 13.6 10³ 9.8 19380 10⁻³
P = 2.5 10⁶ Pa
Now we can use the ideal gas equation to
PV = nR T
PV / T = n R
Let's use the subscript 1 for the starting point and the subscript 2 for the point where the valve opens at a constant volume
P₁ V / T₁ = P₂ V / T₂
T₂ = P₂ T₁/ P₁
let's calculate
T₂ = (2.5 10⁶/11 10⁵ 32
T₂ = 72ºC
2.0 A are flowing through an electric motor. How long will it take for 40 Coulombs to flow through the motor?
Answer:
Answer: Magnitude = [____]; unit = [____].
Explanation:
I WILL GIVE BRAINLIEST TO WHOEVER GETS THIS QUESTION CORRECT!!!
Which statement is true of a distance-time graph?
A.) A line with a curve indicates that the object has a constant speed.
B.) The line in the graph points downward if the object is speeding up.
C.) The line shows a change in speed if its angle changes.
D.) The line shows the path of the object that is moving.
Answer: c) The line shows a change in speed if its angle changes.
I'm not sure
Explanation:
During a demonstration, a teacher mixed vinegar (an acid) with baking soda (a base). Lots of bubbles formed. The vinegar was gone when the bubbling stopped. The liquid that remained was a solution of a new substance in water. What was the teacher most likely demonstrating? A a physical change B the process of baking C a chemical reaction D the strength of acids
Answer:
C
Explanation:
It’s a chemical reaction
The net force on a vehicle that is accelerating at a rate of 1.2 m/s2 is 1500 newtons. What is the mass
of the vehicle to the nearest kilogram?
A. 180 kg
B. 125 kg
C. 1800 kg
D. 1250 kg
Answer:
D. 1250kg
Explanation:
Given
Force (F) = 1500N
Acceleration (a) = 1.2m/s²
Required
Determine the mass (m) of the vehicle
To solve this, we'll apply the following formula used in calculating force on an object.
Force(F) = Mass(m) * Acceleration (a)
Substitute values for F and a
1500N = m * 1.2m/s²
Make m the subject of formula
m = 1500N ÷ 1.2m/s²
m = 1250kg
Hence, the mass of the vehicle is 1250kg
Which of the following best describes a wave moving through a medium?
O A. The matter making up the medium moves right along with the
wave.
B. The energy of the wave is not transferred along with the wave.
C. When energy is transferred, the wave stops.
D. The matter making up the medium does not move along with the
wave.
Answer:
A
Explanation:
The particles of the medium don't travel along with the wave. and I also just did this question
Alessandro has committed to riding his bike to and from school when the weather is good. All week, he rides to school without any problems. But on Friday, he remembers that he must bring home equipment for a science experiment that is too big to carry on a bike. What did Alessandro forget to do before making his lifestyle change? consider his conflicts
B.
set a routine
C.
choose an exercise
D.
consider his schedule
Answer: D- Consider his schedule
Answer:
a. consider his conflicts
Explanation:
The pressure inside a sealed container of methane gas (CH4) is 35.0 kPa. If this 80.0 L sample
of methane is increased to a pressure of 92.0 kPa, what is the new volume?
Answer:
The answer is 30.43 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{35000 \times 80}{92000} = \frac{2800000}{92000} = \frac{700}{23} \\ = 30.434782...[/tex]
We have the final answer as
30.43 LHope this helps you
You are a lifeguard and spot a drowning child 30 meters along the shore and 60 meters from the shore to the child. You run along the shore and for a while and then jump into the water and swim from there directly to child. You can run at a rate of 5 meters per second and swim at a rate of 1 meter per second. How far along the shore should you run before jumping into the water in order to save the child? Round your answer to three decimal places.
Answer:
The lifeguard should run approximately 17.752 meters along the shore, before, jumping in the water
Explanation:
The given parameters are;
The rate at which the lifeguard runs = 5 m/s
The rate at which the lifeguard swims = 1 m/s
The horizontal distance of the child from the lifeguard = 30 meters along the shore
The vertical distance of the child from the lifeguard = 60 meters along the shore
Let x represent the distance the lifeguard runs
We have;
The distance the lifeguard swims = √((30 - x)² + 60²)
Time = Distance/Speed
The time the lifeguard runs = x/5
The time the lifeguard swims = √((30 - x)² + 60²)/1
The total time = √((30 - x)² + 60²) + x/5
The minimum time is given by finding the derivative and equating the result to zero, as follows;
Using an online application, we have;
d(√((30 - x)² + 60²) + x/5)/dx = 1/5 - (30 - x)/(√((30 - x)² + 60²)) = 0
Which gives;
1/5 - (30 - x)/(√(x² - 60·x + 4500) = 0
(30 - x)/(√(x² - 60·x + 4500)) = 1/5
5×(30 - x) = √(x² - 60·x + 4500)
We square both sides to get;
(5×(30 - x))² = (x² - 60·x + 4500)
(5×(30 - x))² - (x² - 60·x + 4500) = 0
25·x² - 1500·x + 22500 - x² + 60·x - 4500 = 0
24·x² - 1440·x + 18000 = 0
Dividing n=by 24 gives;
24/24·x² - 1440/24·x + 18000/24 = 0
x² - 60·x + 750 = 0
By the quadratic formula, we have;
x = (60 ± √((-60)² - 4×1×750))/(2 × 1) =
Using an online application, we have;
x = (60 ± 10·√6)/(2)
x = 30 + 5·√6 or x = 30 - 5·√6
x ≈ 42.25 m and x ≈ 17.752 m
At x = 42.25
Time = √((30 - 42.247)² + 60²) + 42.247/5 ≈ 69.69 seconds
At x = 17.75
Time = √((30 - 17.752)² + 60²) + 17.752/5 ≈ 64.79 seconds
Therefore, the route with the shortest time is when the lifeguard runs approximately 17.752 meters (rounded to three decimal places) along the shore, before, diving in the water
I think it's D but im not sure
Answer: I think it’s actually a
Explanation: water only rises when it’s warm and the will condense as it gets colder
Which equation shows the relationship of wave speed to
wavelength and wave frequency?
a Speed = Wavelength x Frequency
b Speed = Wavelength/Frequency
C Speed = Frequency/Wavelength
d None of the above
Answer:
Answer is A
Speed = Wavelength × Frequency
Explanation:
Googled it
someone pls help me !!!!
Question 9 of 10
Which two changes would increase the gravitational force between two
objects?
O A. Decrease the distance between the objects.
B. Decrease the mass of both objects.
C. Increase the distance between the objects.
D. Increase the mass of one of the objects.
U
E. Decrease the mass of one of the objects.
SUBM
Answer:
the answer is A and B, decrease in distance and decrease in mass
What process is this?
A mudslide flowing down a steep hill.
Weathering
Deposition
Erosion
Answer:
Erosion cuz the mudslide is washing away other parts of Earth's ground
Explanation:
Hope this helped, Have a Great Day!!
An object is thrown off a cliff with a horizontal speed of 10 m/sec. After 3 seconds the object hits the ground. Find the height of the cliff and the total horizontal distance traveled by the object.
Answer:
223
Explanation:
1243rrheggqfggqff
What is the magnitude (size) and direction of the cumulative force acting on the car shown in the picture above?
A.
2500 N up
B.
30 N to the right
C.
30 N to the left
D.
2500 N down
Answer:
B
Explanation:
.....50N-20N =30N ...
Answer:
B. 30 N to the right
Explanation:
The weight of the car, 2500 N, is pushing down while the road is pushing up with a force of equal magnitude. Those forces cancel each other out. The car is being pushed to the left with a force of 20 N and to the right with a force of 50 N. Thus, the cumulative force is 30 N to the right.
What is the velocity?
Answer:
B. 0.98 m/s
Explanation:
This is because we use the simple formula of dividing the distance by the time. In which case would be 13.69m (distance) divided by 13.92s (time) and we will get 0.983477011 or 0.98m/s (your answer)
I hope this made sense and hoped it helped. Good luck with your test luv :)
In boiling water, water molecules move apart and escape in the form of water vapor. The process is called_
Answer:
Evaporation
Explanation:
Evaporation occurs when a liquid changes to a gas. During evaporation, molecules gain enough thermal energy to escape from the liquid surface into the air as water vapor. Water-vapor molecules spread out, breaking completely free of each other, and then disperse or spread out among the other gas molecules in the air.
Hope this helps stay safe
love anyla..
Answer:
evarporation that is the answer i think because molecules of liqid are sperated thats why when in boiling water The molecules move apart and escape in vapour even i don't think it is the right answer
Tanya randhawa is standing on top of a train that is traveling at 7 km/sec. The train hits a cow and comes to a complete stop. There is no gravity or friction in Tanyas world. According to newton's first law what happens to tanya
Answer:
Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
Explanation:
Newton's First Law, or also called the Law of Inertia, postulates that every body that is not subjected to any interaction (free or isolated body) remains at rest or moves with constant speed. In other words, it is not possible for a body to change its initial state (whether of rest or motion) unless one or more forces intervene.
In this law then the net force (Σ F) applied on a body is equal to zero and explains that to modify the state of motion of a body it is necessary to act on it.
Tanya randhawa is standing on top of a train traveling at 7 km / sec and the train collides with a cow and comes to a complete stop. Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
What is the relationship between force and distance?
Answer:
Force is the action exerted on a body of mass to move from one palce to another or to change position
While distance is a measure of how far and object has travelled from its starting point, or how far away it is OR Distance is a measure of seperation between two points
Explanation:
The relationship between them both is MOTION .......thats what I think
♥️✌❤✌
It's a filling the blank worksheet and I always have trouble with these.
Answer:
Delete the lines
Explanation:
because first you can make it look more like the other words and if your teacher have a difficult time seeing what you wrote just highlight it.
A wave has a wavelength of 0.5 meters and a frequency of 120 Hz. What is the wave’s speed?
Answer:
60 m/s
Explanation:
v = ?
lamda = 0.5 m
f = 120 Hz
v = 120 × 0.5
v = 60 m/s
The wave moves at a speed of 60 m/s at the specified wavelength and frequency.
What is the Wavelength?A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. Its length is typically defined in wireless systems in metres (m), centimetres (cm), or millimetres (mm) (mm).
The wavelength is more frequently described in nanometers (nm), which are quantities of [tex]10^-^9 m[/tex], or angstroms (), which are units of [tex]10^-^1^0 m[/tex], for infrared (IR), visible light (UV), and gamma radiation ().
For above given example,
Wavelength is equal to 0.5 metres and frequency is equal to 120 hertz.
The general wave equation is applied to determine the wave's speed as illustrated below;
v = fλ
where; The wave's speed is v.
v = 120 x 0.5
v = 60 m/s
Thus, the wave moves at a speed of 60 m/s at the specified wavelength and frequency.
Learn more about Wavelength, here:
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