Answer:
I think it's 2
Explanation:
Within each column, or group, of the table, all the elements have the same number of valence electrons. This explains why all the elements in the same group have very similar chemical properties. For elements in groups 1–2 and 13–18, the number of valence electrons is easy to tell directly from the periodic table.
A 20 kg block (4) rests on a frictionless table;
a cord attached to the block extends
horizontally to a pulley at the edge of the
table. A 10 kg mass (B) hangs at the end of the
cord.
a. Draw and label the force vectors acting on
each object.
b. Calculate the acceleration of the block and
mass.
c. Calculate the tension in the cord.
Answer:
Try again?
Explanation:
Thermal is to heat as ___ is to water.
drain
waste
dilute
absorb
Answer:Thermal is to heat as absorb is to water.
Explanation:
Water is able to absorb heat - without increasing much in temperature - better than many substances. This is because for water to increase in temperature, water molecules must be made to move faster within the water; this requires breaking hydrogen bonds, and the breaking of hydrogen bonds absorbs heat.
please mark me as brainliest.Thank you so much
He drives 150 meters in 18 seconds. Assuming constant speed, what is his speed in meters per second?
Answer:
Explanation:
Givens
d = 150 meters
t = 18 seconds
r (rate) = ?
Formula
r = d/t
Solution
r = 150/18
r = 8.33 m/s
Do you believe that Freud’s theory was applicable only to the era in which he lived, or do you believe it can still be applied today?
Answer:
Freud's importance to psychology and psychiatry remains in the foundational aspects of the science of human behavior and the mind. Outside of Freudian psychoanalysis, Freud is no longer applicable or important to practical applications of psychological theory.
Using sound waves signals allow oceanography to determine ocean depth
Answer:
echosounding
Explanation:
The time taken for the sound to travel through the ocean and back is then used to calculate water depths. The faster the sound waves return, the smaller the water depths and the higher the elevation of the seafloor.
A raindrop strikes the ground with a speed of 8.5 m/s. The specific heat of water is 4.19 x 103 J/(kg•°C).
What is the raindrop’s change in temperature after it strikes the ground, in degrees Celsius, assuming all its initial kinetic energy goes into heating it?
Answer:
0.00862 °C
Explanation:
When all Kinetic energy goes Into heating we can write
Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x = 0.00862 °C
The energy an object has as a result of motion is known as kinetic energy.A force must be applied to an object in order to accelerate it.We must put in effort in order to apply a force.After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
How is kinetic energy determined?
Kinetic energy has the following formula: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity.The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilograms and the velocity is measured in meters per second. A particle or an item that is in motion has a sort of energy called kinetic energy.An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. When all Kinetic energy goes Into heating we can writeLet's consider a few instances where we see kinetic energy in daily life while keeping this formula in mind.Hydropower Plants, Windmills, Moving Cars, Gunshots, Flying Airplanes, Walking and Running, Cycling, and Rollercoasters are just a few examples.Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x =0.00862 °C
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The vertical displacement of the wave is measured from the what? And what is the term for vertical displacement?
Explanation:
The vertical displacement of the wave is measured from the
equilibrium to the crest and is called the frequency.
crest to the trough and is called the amplitude.
trough to the trough and is called the wavelength.
equilibrium to the crest and is called the amplitude.
HØPÊ ĮŤ ÌŠ helpful
mark mE aS bRillAnT ♠50 POINTS!!!!!!!!
In a GUT (Grand Unified Theory), what is "unified"?
Subatomic particles
Explanation:
Grand unification theory or GUT is a model that tries to describe the universe.
Two spheres each have a mass of 2.0 x 10 kg. How far apart must they be to exert a
gravitational force of 50 N between them?
a).016 m b) 231 m c) 53,000 m
d) 110,000 m
e) 6.7 x 10" m
Hi there!
We can use the Gravitational Force equation:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational force (N)
m₁, m₂ = mass of spheres (kg)
r² = distance between the spheres
G = Gravitational Constant
We are given the force of gravity, so we can rearrange the equation to solve for r:
[tex]r^2F_g = Gm_1m_2\\\\r = \sqrt{\frac{Gm_1m_2}{F_g}}[/tex]
Plug in the given values:
[tex]r = \sqrt{\frac{(6.67*10^{-11})(2.0*10^9)(2.0*10^9)}{50}} = \boxed{231 m}[/tex]
Therefore, the correct answer is B) 231 m.
Two forces of 68 pounds and 66 pounds act simultaneously on an object. The angle
between the two forces is 77º. Find the magnitude of the resultant, to the nearest
pound. Find the measure of the angle between the resultant and the smaller force, to
the nearest degree.
Resultant:
Angle:
Submit Answer
Answer:
Explanation:
Let the x axis lie along the 66 lb force with the force vector tail at the origin.
The 68 lb force would lie along a radial 77° CCW from the x axis
The resultant would have an x and y values of
Fx = 66cos0 + 68cos77 = 81.3 lb
Fy = 66sin0 + 68sin77 = 66.3 lb
F = √(81.3² + 66.3²) = 104.87 = 105 lb
θ = arctan (66.3/81.3) = 39°
Please help me to solve this problem
What are the properties of object located at infinites
Answer:
As the parallel rays coming from the object converge at the principal focus, F of a concave mirror; after reflection through it. Therefore, when the object is at infinity the image will form at F. Properties of the image formed: Point-sized image, highly diminished in size.
At Infinity: At focus (F)
Position of object: Position of image
Between F and C: Beyond C
Beyond C: Between F and C
Explanation:
This is because when the object is at infinity, the incident rays are parallel to the principal axis. Hence the image is formed at the focus. And the image is real and inverted but in diminished size.
A ball thrown straight up takes 1.89s to reach a height of 41.6m.
Taking g =9.81 m/s2, how much higher will the ball go?
Answer:
Explanation:
average velocity is 41.6/1.89 = 22.0 m/s
initial velocity u is
22.0 = (u + u - 9.81(1.89))/2
44.0 = 2u - 18.5
62.56 = 2u
u = 31.3 m/s
max height is
v² = u² + 2as
s = (v² - u²) / 2a
s = (0² - 31.3²) / (2(-9.81)) = 49.9 m
49.9 = 41.6 = 8.27 m higher
In process numbers have been rounded to 3 s.d. for reporting purposes.
A hockey puck is given an initial speed of 5.30 m/s. If the coefficient of friction between the puck and ice is 0.052, how far does the puck slide before coming to rest
Let m be the mass of the puck. Then the upward normal force exerted by the ice has magnitude n = mg (since Newton's law says the net force on the puck in the vertical direction is ∑ F = n - mg = 0).
Then the frictional force applies a force of magnitude f = 0.052mg, and Newton's second law says the net horizontal force acting on the puck is
∑ F = -f = ma
Solve for the acceleration a :
-0.052mg = ma
a = -0.052 (9.8 m/s²)
a ≈ -0.510 m/s²
Assuming constant friction, the puck slides to a rest over a distance x such that
0² - (5.30 m/s)² = 2ax
Solve for x :
x = -(5.30 m/s)²/(2a)
x = -(5.30 m/s)² / (2 (-0.510 m/s²))
x ≈ 27.6 m
Answer:
27.47 meters
Explanation:
The change in kinetic energy of the puck is ΔK = [tex]K_{f} -K_{i} = -mv{_1}^{2} /2[/tex]
The work done on the puck by the force of friction is
[tex]W_{f} = F_{f}dcos(180) = (Mu)Nd = - (Mu)mgd[/tex]
Knowing that
[tex]W_{f}[/tex] = ΔK
obtain
[tex]-(Mu)mgd = -mv_{i}^{2} /2[/tex]
which is:
[tex]d = v_{i}^{2} /2(Mu)g = (5.30)^{2} / 2(0.052)(9.8) =[/tex] 27.47 meters
A person walks 32∘ north of west for 94m and 35∘ east of south for 122m. What is the magnitude of his displacement?
Answer:
n
Explanation:
A spring is attached to an inclined plane as shown in the figure. A block of mass m = 2.27 kg is placed on the incline at a distance d = 0.327 m along the incline from the end of the spring. The block is given a quick shove and moves down the incline with an initial speed v = 0.750 m/s. The incline angle is = 20.0°, the spring constant is k = 455 N/m, and we can assume the surface is frictionless. By what distance (in m) is the spring compressed when the block momentarily comes to rest?
Answer:
0.1351 m
Explanation:
*my number calculations may be wrong, but the process is correct*
W = Wg - Ws = mgh - [tex]\frac{1}{2}[/tex]kx^2 = mg(d + x)sinθ - [tex]\frac{1}{2}[/tex]kx^2
Δk = 0 - [tex]\frac{1}{2\\}[/tex]mv[tex]_{i}[/tex]^2
W = Δk
-[tex]\frac{1}{2}[/tex]mv[tex]_{i}[/tex]^2 = mg(d + x)sinθ - [tex]\frac{1}{2}[/tex]kx^2
Now plug in your given values:
m=2.27, g=9.8, d=0.327, θ=20, k=455, v=0.750
Now rearrange the equation so it is in the form ax^2 + bx + c = 0 where x is the unknown distance you are looking for.
~if my math is correct it should be:~
0 = -227.5x^2 + 7.608580108x + 3.126443195
Now plug your numbers into the quadratic formula and the positive x value you get is the answer.
~if my math is correct it should be:~
x = 0.1351376847 m = 0.1351 m
A red laser with a wavelength of 630 nm and a blue laser with a wavelength of 450 nm emit laser beams with the same light power. How do their rates of photon emission compare
Answer:
Evaluate the following numerical expressions.
6 + 3 • 4 =
18
(6 + 3) ÷ (4 – 5) =
Explanation:
Evaluate the following numerical expressions.
6 + 3 • 4 =
18
(6 + 3) ÷ (4 – 5) =
Help please need help asap
how do anatomical similarities and differences between various organisms ( living and fossils) help infer lines of Evolutionary descent
Answer:
Explanation:
Based on the generalization that "form follows function".
If two creatures have the same or similar anatomical structures used to complete a task such as eating, moving, hearing, smelling, reproduction, etc. the likelihood they are genetically related is high.
If two creatures have differing means or structures used for completing a task, the likelihood of them NOT being closely related is high.
A 15.0kg box slides down an incline 5.00 m high and 9.00 m long. It starts at rest at the top and moves at the speed 2.50m/s when it is at the bottom.
How much work is done by friction? [688J].
What is the energy transformation efficiency? [94%]
Answer:
Explanation:
Potential energy at the top
PE = mgh = 15.0(9.81)(5.00) = 735.75 J
Kinetic energy at the bottom
KE = ½mv² = ½(15.0)(2.50)² = 46.875 J
Work done by friction is the difference
735.75 - 46.875 = 688.875 ≈ 689 J
HMMMMMmmmm Energy transformation efficiency is 100% because energy can be neither created nor destroyed. With the given answer, I'm guessing they want to know what percentage of the potential energy got converted to heat of friction
688.875 / 735.75 = 0.936289... ≈ 94%
How many different values can digital signals take on?
Any value .
Two values : and 1.
Only specific values .
Any value between 1 and 10.
Answer:
Option d: value between 1 and 10
The data are continuous if they can take on any value within a range.
not complete sure if it is correct but yea
.
Explanation:
Earth travels around the Sun in an elliptical orbit. Because of its elliptical orbit, Earth is not the same distance from the Sun at all times. When Earth is closer to the Sun, the amount of solar power that arrives at Earth's surface is greater. Total solar irradiance, also referred to as solar intensity, is defined as the total solar power received by a unit surface area and is measured in units of watts per square meter. The Sun's power output is 3.86 x 1026 W. The distance from Earth to the Sun is 0.9813 au when Earth is the closest, at perihelion, and 1.0160 au when Earth is the farthest, at aphelion. Calculate the average total solar irradiance Itop at the top of Earth's atmosphere. Express your answer to 4 significant figures. Itop = W/m²
The intensity of the radiation from the Sun reduces as the distance from the Sun increases.
The solar irradiance at the top of Earth's atmosphere is approximately 1,376.22 W/m².Reasons:
The solar flux density is given by the formula;
[tex]\displaystyle S_d = \frac{L}{ \left(4 \cdot \pi \cdot d^2 \right)}[/tex]
L = 3.86 × 10²⁶ W
The average distance from the Earth to the Sun is found as follows;
[tex]d_{ave } = \displaystyle \frac{0.9813 \ au + 1.0160 \ au}{2} = 0.99865 \ au[/tex]
1 au = 1.496 × 10⁸ km
0.99865 au = 0.99865 × 1.496 × 10⁸ km = 149,398,040 km
[tex]\displaystyle S_d = \frac{3.86 \times 10^{26}}{ \left(4 \times \pi \times (1.49398040 \times 10^{11})^2 \right)} \approx 1,376.22[/tex]
The solar flux density reaching Earth, [tex]S_d[/tex] = The average total solar irradiance
[tex]I_{top}[/tex] at the top of Earth's atmosphere ≈ 1,376.22 W/m².
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by pushing the crate up the ramp rather than lifting it to the platform, you are using ________ force, but moving the crate a ____________ distance
A) more; less
B) more; greater
C) less; greater
D) the same amount; greater
Answer:
a
Explanation:
rwggwh4
If you're under stress what is the best way to recharge and calm the brain
Answer:
Take slow, deep breaths. Or try other breathing exercises for relaxation. ...
Soak in a warm bath.
Listen to soothing music.
Practice mindful meditation. The goal of mindful meditation is to focus your attention on things that are happening right now in the present moment. ...
Write. ...
Use guided imagery.
find resultant vector and direction
Answer:
Explanation:
V = √(15.4² + 15.4²) = 21.77888886054... 21.8 m/s
θ = arctan(15.4/15.4) = 45.0°
A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The change in speed of this object will be:
The change in speed of this object is 3m/s
According to Newton's second law;
F = ma
F = mv/t
Given the following parameters
Force F = 8.0N
mass m = 16kg
time t = 4.0s
Required
speed v
Substitute the given parameters into the formula
v = Ft/m
v = 8 * 6/16
v = 48/16
v = 3m/s
Hence the change in speed of this object is 3m/s
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A car traveling 23 m/s begins to decelerate at a constant rate of 5 m/s2. After how many seconds does the car come to a stop
The time elapsed when the car comes to complete stop is 4.6 s.
The given parameters;
initial velocity of the car, [tex]v_0[/tex] = 23 m/sacceleration of the car, a = - 5 m/s²The time elapsed when the car comes to complete stop is calculated as follows;
[tex]v_f = v_0 + at[/tex]
where;
[tex]v_f[/tex] is the final velocity of the car when it comes to a complete stop
[tex]0 = 23 + (-5)t\\\\0 = 23 - 5t\\\\5t = 23\\\\t = \frac{23}{5} \\\\t = 4.6 \ s[/tex]
Thus, the time elapsed when the car comes to complete stop is 4.6 s.
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100 POINTS!!!!!!!!!!!!!!! (EASY SCIENCE 10 QUESTION!!!!!!)
In a GUT (Grand Unified Theory), what is "unified"?
Question 9 options:
subatomic particles
galaxies
fundamental forces
matter
Answer:
AccordingTo GUT(Grand Unified Theory)subatomic particles is Unified
Help me please I will give you a crown!!!!
Answer:
D. First F, then D, then C
Explain in your own words what is the fourth commandment.
the fourth commandment is to remember my Sabbath day which is to not do any labor on the 7th day which is Sunday.
Explanation:
hope this helps I don't know if you meant from the Bible or not.
Answer:
From Wikipedia, the free encyclopedia. The Fourth Commandment of the Ten Commandments may refer to: "Remember the sabbath day, to keep it holy", under the Philonic division used by Hellenistic Jews, Greek Orthodox and Protestants except Lutherans, or the Talmudic division of the third-century Jewish Talmud
Explanation:
I hope this helps
PLEASE GIVE ME BRAINLEST i really need this
