Answer:
Well If the unknown is one of four possible compounds which melt at 102, 104, 106, and 108° C, it is most likely that which melts at 108° C. To summarize, an impure solid melts over a wide range and at a temperature lower than that of the pure solid.
Explanation:
I have known this since grade school
Help please need help asap
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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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 plane travels a distance of 3,650 kilometers in 5.50 hours. What is the average speed of the plane
Answer: 625.71km/h
Explanation: Divide the numbers.
Your own car has a mass of 1200 kg. If your car produces a force of 6000 N, how fast will it accelerate?
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
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.
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.
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.
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.
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.
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°
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 ♠Please help me to solve this problem
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%
Question 1 (2.5 points)
Which of the following safety guidelines is NOT important to this lab experiment?
Use wet paper towels or a fire extinguisher to put out small fires.
Ensure that you have a clean working space to minimize errors.
Wear goggles when there are flying objects near your face.
Read instructions before beginning the lab so you know what you are doing.
Question 2 (2.5 points)
As the number of washers goes up, what happens to the mass and the centripetal force on the apparatus?
mass goes up, centripetal force goes down
mass goes up, centripetal force goes up
mass goes down, centripetal force goes down
mass goes down, centripetal force goes up
Question 3 (2.5 points)
What is the independent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 4 (2.5 points)
What is the dependent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 5 (2.5 points)
Why is it important to keep the length of the string the same?
Because it can affect the velocity by affecting the circumference.
To make the experiment easier.
Because that is the only length it will work properly at.
Because that is the only length it will work properly at.
Question 6 (2.5 points)
As the number of washers goes up, what happens to the circumference?
The circumference increases.
The circumference decreases.
The circumference stays the same.
What's a circumference?
Question 7 (2.5 points)
As the number of washers goes up, what happens to the time for 20 rotations?
The time increases.
The time decreases.
The time stays the same.
Question 8 (2.5 points)
As the number of washers goes up, what happens to the velocity?
The velocity increases.
The velocity decreases.
The velocity stays the same.
Question 9 (2.5 points)
Which of these is the best defintion for PERIOD in this experiment?
The time for one wave.
The time for one class.
The time for one revolution.
The dot at the end of a sentence.
Question 10 (2.5 points)
Why do we measure the time for 20 revolutions instead of the time for one revolution?
To get more accurate results.
Because human reaction time is too slow to reliably measure one revolution.
To reduce human errors in the results.
All the other answers are correct.
Answer:
I took the test on K12 and got an A
1. A
2. B
3. A
4. C
5. A
6. C
7. B
8. A
9. C
10.C
PLS HELP!!!!
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
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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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 225 kg crate is pushed horizontally with a force of 710n
Answer:
acceleration is 3.155
Explanation:
F = ma
710 = 225 a
a = 710/225
a = 3.155
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
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.
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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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.
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:
Help me please I will give you a crown!!!!
Answer:
D. First F, then D, then C
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 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°
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:
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) =
