Answer:
-0.4D(maybe)
Explanation:
combined focal length (f)= 0.4m
D1 = 5D
Then f1= 1/D1
= 1/5 = 0.2 m
1/f=1/f1+1/f2
1/0.4=1/0.2+1/f2
f2= -5/2
D2=1/f2= -0.4D
A student designs an experiment where he takes a small wood car with 1.0 inch diameter wheels and rolls it down a ramp. The student measures the speed of the car when it reaches the bottom of the ramp. The student then takes a small plastic car with 1.5 inch diameter wheels and repeats the process. Finally, the student takes a small metal car with 2.0 inch diameter wheels and repeats the process a final time. The student notes that the metal car had the fastest speed at the bottom of the ramp
Which phenomenon provides evidence that the hydrogen atom has discrete energy levels?
The phenomenon known as the Emission Spectra.
Emission spectrum is the phenomenon provides evidence that the hydrogen atom has discrete energy levels.
What is emission spectrum?Emission spectrum is the spectrum of the different energy levels. The occurrence of emission spectrum gives proof that the hydrogen atom has distinct energy levels.
Emission spectrum is the phenomenon provides evidence that the hydrogen atom has discrete energy levels
Hence, the phenomenon is known as emission spectrum.
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what property of iron can you use to separate nails from a mixture of glass wood and gravel??
Answer:
The magnetic separation
Explanation:
It is a process in which magnetically susceptible material is extracted from a mixture using magnetic force. This is best way to separate the mixture of sand and iron fillings as iron is attracted by magnet.
Gamma rays can cause cancer, but they can also be used to treat cancer. How
would you answer a sixth grader who asks you, "Is radiation good or bad?"
Answer:
I think it depends on the purpose of using Gamma rays. It can be both good and bad
Give the following capacitor color codes : ORANGE VIOLET YELLOW WHITE RED
Answer:
Orange: 3
Violet: 7
Yellow: 4
White: 9
Red: 2
Answer:Orange: 3Violet: 7Yellow: 4White: 9Red: 2
Explanation: is that what you looking for
what is one example of a mineral that is found in space?
Answer:
Iron meteorites
Explanation:
Answer:
iron, nickel, iridium, palladium, platinum, gold, and magnesium
You can choose any one which you like.
Explanation:
All minerals that we humans found are found in space.
And minerals unknown are also found.
vibrating part of giutar
Answer:
The Vibrating parts of a Guitar is it's Strings
Explanation:
Guitars are classified in 2 sections: the neck and the body. Strings run through the neck and body of the guitar. When a string is played its vibration is transmitted from the bridge, resonating throughout the top of the guitar.
Answer:
the strings are the part that vibrates
a 100 kg person travels from sea level to an altitude of 5000 m. By how mans newtons does their weight change?
Answer:
Thus, the change in the weight of the person is 1.6N , option c is correct.
Explanation:
5. A person on a trampoline jumps straight up. When the person is 3 m above the surface and
with upward velocity of 2.5 m/s, drops a ball. a) What is the speed of the ball at the time of
impact? b) How long before the ball impacts the surface of trampoline?
a)The speed of the ball at the time of impact will be 8.1 m/sec.
b)The time taken by the ball impacts the surface of trampoline will be 1.1 second.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. Its SI unit is m/sec.
Given data;
g( gravitational acceleration) = 9.81 m/s2
u (initial velocity of ball) = 2.5 m/s
h₁(initial height of the ball) = 3.0 m
v (speed of the ball at the time of impact ) ?
The time taken by ball for upward journey = u / g
t₁ = u / g
t₁ = (2.5 m/s) / (9.81 m/s2) =
t₁ =0.2548 s
From second equation of motion,upward vertical distance covered by ball is;
[tex]\rm h_2= \frac{1}{2} gt^2\\\\ h_2=\frac{1}{2} \times 9.81 \times (0.2548)^2\\\\ h_2=0.3184[/tex]
The total distance in the downward direction travelled;
[tex]\rm h_3=h_1+h_2 \\\\ h_3=3.0+0.3184 \\\\ h_3=3.3184 \ m[/tex]
The time taken for the downward motion is;
[tex]\rm t_2 = (\frac{2 \times h_3 }{g} )^\frac{1}{2}\\\\ t_2 = 0.825 \ m/sec[/tex]
The speed of the ball at the time of impact is found as;
[tex]\rm V=gt_2 \\\\ V= 9.81 \times 0.8225 \\\\ V= 8.07 \ m/sec[/tex]
The total time of the flight of ball is;
[tex]\rm t_3 = t_1+t_2 \\\\ t_3=0.2548+0.8225 \\\\ t_3=1.0774 \ sec[/tex]
Hence,the speed of the ball at the time of impact will be 8.1 m/sec and time taken by the ball impacts the surface of trampoline will be 1.1 second.
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What is the force of gravity (in newtons) acting between the earth and a 5 kg bowling ball that is resting on the surface of the earth
Answer:
49 N
Explanation:
F = m a
= 5 * 9.81 =~ 49 N
Nitrogen oxides in car exhaust react with sunlight to produce
form a hypothesis to explain the shape of this graph
Answer:
the data change decreased and then increased. this went on repeatly but the decrease became less as the increase became more.
Which activity is the first step in the scientific method? Question 5 options: reporting a conclusion forming a hypothesis examining date gathering data
Forming an hypothesis is the first step in the scientific method.
HypothesisA hypothesis can be defined as a guess as to what will happen during your experiment. Hypothesis can in other terms be defined as a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories.
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Calculate the final velocity of m1=2kg with its velocity at 5m/s
The final velocity of m₁=2kg with its velocity at 5m/s will be 4 m/s.
What is the law of conservation of momentum?According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The given data in the problem is;
(m₁) is the mass = 2 kg
initial velocity (u₁) =5m/s
(m₂) is the mass = 0.5
(u₂) initial velocity = 0 m/s
(v) is the velocity =.?
According to the law of conservation of momentum;
Momentum before collision =Momentum after collision
[tex]\rm m_1u_1 + m_2u_2 = v(m_1 + m_2) \\\\ 2(5) + 0.5(0) = v(2 + 0.5)\\\\10 = 2.5v\\\\ v = \frac{10}{2.5} \\\\ v = 4 \ m/s[/tex]
Hence,The final velocity of m₁=2kg with its velocity at 5m/s will be 4 m/s.
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What is the relationship between the quantity of matter and mass?
Explanation:
The substance with less quantity of matter has less mass and that with more quantity has more mass..
[tex]...[/tex]
Which of these orders has the structure of the universe from the smallest to largest?
1. solar systems - galaxies - clusters - superclusters
2. superclusters - clusters - solar systems - galaxies
3. clusters - superclusters - solar systems - galaxies
Answer:
From largest to smallest they are: Universe, galaxy, solar system, star, planet, moon and asteroid.
Explanation:
Three resistances of 12 , 16 , and 20 are connected in parallel. What resistance must be connected in series with this combinations to give a total resistance of 25 ?
Answer:
Total resistance in parallel is Rp
So (1/Rp) = (1/12)+(1/16)+(1/20)
Rp = ?
impedance is 25
25 = Rp + Rs
put the value of Rp you'll get the answer.
What is the FUNCTION of cilliated
epithelium (the cilia) in the lining of the
trachea and bronchi?
Explanation:
In the trachea's inner layer, you have small, hair-like structures called cilia. Cilia move in rhythm to push mucus out of your trachea so that you either expel or swallow it
Group the labels according to the type of force they describe
Contact, no contact or both
We can confirm that a contact force would be one in which physical contact is needed, while a no contact force does not require contact.
What are some examples of these forces?There are many everyday examples to be used to describe each of these forces. A very common no contact force is gravity. The Earth's gravity exerts a force on all things near the planet, but it does not need to be in physical contact to exert this force, thus making gravity a no contact force. An example of a contact force would be if you were to push another person. You are exerting a force that requires physical contact.
Therefore, we can confirm that a contact force would be one in which physical contact is needed, while a no contact force does not require contact.
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please take 50 points please help me
please
I am using a calculator for this question so hopefully this helps + I added working out just in case.
a) mean - 124 (add them all together then divide by 25)
b) standard deviation - 7.776888838 (7.76 to d.p)
c) the person might have eaten foods that increase or decrease the BP so every time they took their blood pressure, it might not have been done as the same routine as others (if this makes sense). Also, some blood pressures are lower than others like for example some might go down to 110 but others go all the way up to like 132, does why I said that they might have eaten food or done activites that increases the blood pressure.
Which one of the following types of electromagnetic wave travels through space the fastest?
Answer:
As a result, light travels fastest in empty space, and travels slowest in solids. In glass, for example, light travels about 197,000 km/s.
Explanation:
Which of the following is not an air pollutant?
1. carbon dioxide
2. carbon monoxide
3. particulate matter
4. sulfur dioxide
What is the voltage of this circuit.
¿Cuál es el voltaje de este circuito?
W
R1
20
W
N
+
1 +
100
W
w
15 0
(1=7A
=
w
R5
Repost!!!!! Need help
Answer:
110.4 v
Explanation:
Find the equivalent resistance of the two parallel circuits
R1 and R2 in parallel = R1 * R2 / (R1+ R2) = 1 ohm
similarly R4 and R5 = 4.77 ohms
Now you can add the three resistances into one (R3=10)
1 ohm + 10 ohm + 4.77 ohm = 15.77 ohms
Now
V = IR
V = 7 amps * 15.77 ohm = 110.4 v
take 50 points please help me these two questions
[tex]\\ \rm\Rrightarrow T=2\pi\sqrt{\dfrac{l}{g}}[/tex]
[tex]\\ \rm\Rrightarrow T^2=4\pi ^2\dfrac{l}{g}[/tex]
[tex]\\ \rm\Rrightarrow l=\dfrac{T^2g}{4\pi^2}[/tex]
If we solve it we get it in between 60 -80
So
Our average breath rate is 17-20
So the ratio will come near 4+
On a frictionless horizontal air table, puck A (with mass 0.251 kg ) is moving toward puck B (with mass 0.371 kg ), which is initially at rest. After the collision, puck A has velocity 0.120 m/s to the left, and puck B has velocity 0.654 m/s to the right.
What was the speed vAi of puck A before the collision?
Calculate ΔK , the change in the total kinetic energy of the system that occurs during the collision.
(a) The speed of puck A before the collision is determined as 0.847 m/s.
(b) The change in the total kinetic energy of the system that occurs during the collision is 0.009 J.
Speed of puck A before the collisionThe speed of puck A before the collision is calculated from the principle of conservation of linear momentum as follows;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
0.251u₁ + 0.371(0) = 0.251( -0.12) + 0.371(0.654)
0.251u₁ = 0.2125
u₁ = 0.2125/0.251
u₁ = 0.847 m/s to the right
Change in the total kinetic energy of the systemInitial kinetic energy = ¹/₂ x 0.251 x (0.847)² + ¹/₂ x 0.371 x (0) = 0.09 J
Final kinetic energy = ¹/₂ x 0.251 x (-0.12)² + ¹/₂ x 0.371 x (0.654)² = 0.081 J
ΔK.E = 0.081 - 0.09 = 0.009 J ≈ 0 J
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2 kg
Use 10 m/s2 for g
Answer:
See below
Explanation:
At point A the PE = mgh = 2 * 10 * 1 = 20 J
at point B, all of the PE , 20 J , is converted to Kinetic Energy
KE = 1/2 m v^2
20 = 1/2 (2)(v^2 )
20 = v^2 v = sqrt 20 = 4.47 m/s
for the friction part
vf = vo t + 1/2 a t^2 vf = final velocity = 0 (stopped)
vo = original velocity = 4.47 m/s
a = -1 m/s^2
0 = 4.47 t + 1/2 (-1) t^2
- .5t^2 + 4.47 t = 0
t ( -.5t+ 4.47) = 0 shows t = 4.47/.5 = 8.9 seconds
The product of an object's mass and velocity is it's
A) acceleration
B) inertia
C) momentum
D) weight
Answer:
C) Momentum
Explanation:
Refers to an objects mass in motion.
5. How do you determine the strength of the electric field of a charge?
A. Putting a small test charge close to the electric field.
B. Using a voltmeter.
C. Using an ammeter.
D. Putting a large test charge close to the electric field.
derive the electric field intensity at an equitorial point !
[tex] \\ [/tex]
ty! (:
Answer:
Hence, electric field intensity at equatorial point is given by, $\therefore {E_p} = - \dfrac{1}{{4\pi {\varepsilon _0}}}\dfrac{{\vec P}}{{{d^3}}}$. And the direction of the electric field is always opposite to that of the electric dipole.
To measure the vast distance in space ,scientists use a unit called a ______, which is how far travels in one year.
The closest star to Earth is ______.
(Look at the picture)
Answer:
"light year" - about 6 million million miles
The nearest star is alpha Centauri - about 24 million million miles away
