Answer:
D: The hydrogen bonds between water molecules are more cohesive in the liquid state than in the solid state.
Explanation:
If we assume that there is no phase change due to heating, we know that the temperature change will be proportional to the mass heated, being the proportionality constant that is a quantity which depends on the material, and also represents the resistance of the material to cause a change in the temperature and is called specific heat.
Now, if we are to assume that the mass is the same for the three phases, and that the amount of heat supplied is also the same, the phase with the highest specific heat will therefore possess the lowest temperature change.
At a lower temperature, the hydrogen bonds will be more cohesive than at higher temperatures.
We are told that in it's solid state, it has a specific heat capacity of 2.093 J/g°C while in its liquid state, it has a specific heat capacity of 4.186 J/g°C.
Thus, the hydrogen bonds between water molecules in the liquid state will be less cohesive than in its solid state.
Answer: D
Explanation:
A man can jump 1.5 m on earth. calculate the approximate
height he might be
able to jump on
a planet whose
density is one quarter of the earth and where radius
is one third that of earth.
Radius of earth = 6400km
Acc. due to gravity=9.8 m/s²
Mass of earth = 6X10^24 kg
Answer:
18 m
Explanation:
G = Gravitational constant
m = Mass of planet = [tex]\rho V[/tex]
[tex]\rho[/tex] = Density of planet
V = Volume of planet assuming it is a sphere = [tex]\dfrac{4}{3}\pi r^3[/tex]
r = Radius of planet
Acceleration due to gravity on a planet is given by
[tex]g=\dfrac{Gm}{r^2}\\\Rightarrow g=\dfrac{G\rho V}{r^2}\\\Rightarrow g=\dfrac{G\rho \dfrac{4}{3}\pi r^3}{r^2}\\\Rightarrow g=\dfrac{4G\rho\pi r}{3}[/tex]
So,
[tex]g\propto \rho r[/tex]
Density of other planet = [tex]\rho_p=\dfrac{1}{4}\rho_e[/tex]
Radius of other planet = [tex]r_p=\dfrac{1}{3}r_e[/tex]
[tex]\dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\rho_p r_p}\\\Rightarrow \dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\dfrac{1}{4}\rho_e\times \dfrac{1}{3}r_e}\\\Rightarrow \dfrac{g_e}{g_p}=12\\\Rightarrow g_p=\dfrac{g_e}{12}\\\Rightarrow g_p=\dfrac{9.8}{12}[/tex]
Since the person is jumping up the acceleration due to gravity will be negative.
From kinematic equations we have
[tex]v^2-u^2=2g_es\\\Rightarrow u^2=v^2-2g_es\\\Rightarrow u^2=0-2\times -9.8\times 1.5\\\Rightarrow u^2=2\times 9.8\times 1.5[/tex]
On the other planet
[tex]v^2-u^2=2g_ps\\\Rightarrow s=\dfrac{v^2-u^2}{2g_p}\\\Rightarrow s=\dfrac{0-(2\times 9.8\times 1.5)}{2\times -\dfrac{9.8}{12}}\\\Rightarrow s=18\ \text{m}[/tex]
The man can jump a height of 18 m on the other planet.
PLEASE HELP ME. And ACTUALLY give correct answers and EXPLAIN because these are free responses. If you get it right, I will mark you brainliest.
Imagine you've recently insulated your loft. Give a reason why your heating bill may still increase.
Answer:
follow me for the answer
Iron nail sinks in water while a ship made of iron-steel floats in it. Why ?
Answer:
because the density of iron nail is more tha n density of water but the density of ship made iron steel is less than the density of water
Projectiles move in which two directions?
Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.
hope it helps!!
Answer:
up and down
Explanation:
this is because they do have the correct flagellum to move to the left and to the right
Yoga not only builds flexibility, but strength and balance.
True or False
Answer:
True
Explanation:
I just know.
1. How much work is done by a person if he lifts a load of 500 kg upto a height of 2m?
Explanation:
if we take g=9.8m/s^2
F=mg
m=500
F=500×9.8=4900N
h=2
so w=mgh
w=4900×2
=9800j
With a pulley system, a force of only 50 lb can lift a 500-lb weight. What is the mechanical advantage if this system is 100% efficient
Answer:
the mechanical advantage is 10
Explanation:
The computation of the mechanical advantage is as follows:
Mechanical advantage is
= Load ÷ Effort
where,
The Loan is equivalent to the weight i.e. 500 lb
And, the effort is equivalent to the force applied i.e. 50lb
So, the mechanical advantage is
= 500 ÷ 50
= 10
Hence, the mechanical advantage is 10
A sports car skids off of a wet mountain road at 48.5 m/s and lands in the river, 110
m below the road. How long will it take for the sports car to land in the river?
Answer:
about 4.74 seconds
Explanation:
The time to fall distance d from height h is given by ...
t = √(2d/g)
t = √(2·110 m/(9.8 m/s^2)) ≈ 4.74 s
It will take the car about 4.74 seconds to fall 110 meters to the river.
__
We assume the car's speed is horizontal, so does not add or subtract anything to/from the time to fall from the height.
The two types of biogenous sediments are calcareous ooze and _____ ooze.
Answer:
The two types of biogenous sediments are calcareous ooze and siliceous ooze
Explanation:
When your motivation is intrinsic, the process is more important than the __________.
result
weight loss
mindset
By comparing yourself to a standard of fitness, you will be able to see your natural ____________ and where there is room for improvement.
hobbies
strengths
interests
Information gives you the ____________ to change your body and your life.
power
ability
excitement
Your ____________________ is the number of beats per minute your heart needs during a workout.
resting heart rate
maximum heart rate
target heart rate
If you want to make something official, _____________!
write it down
visualize it
tell a friend
A state of being conscious, or aware, of something is called ________________.
activation
mindfulness
motivation
Flexibility is earned through regular ____________ and ____________.
effort and practice
effort and determination
hard work and new gym clothes
Answer:
1. result
2.strengths
3. power
4. target heartbeat
5. visualize it
6. mindfulness
7. effort and practice
tried my best not sure if #3 #5 and #7 is correct but I tried. How is it?
Answer:
i think its....A
Explanation:
A 45kg sled is being pulled from camp by 5 dogs each capable of exerting 25N force on the sled. If the sled starts from rest and the frozen ground exerts 15N of friction, how far will the sled be from the camp after 7s?
Answer:
58.8m
Explanation:
a 2kg box frictionless ramp angle 60 degrees top of ramp is 30 m how long will it take to reach the ground
Answer:
2.66secs
Explanation:
To get the time it will take to reach the ground, we will use the equation of motion;
S = ut + 1/2at²
S is the distance
u is the initial velocity
g is the acceleration due to gravity
Given
S = 30m
u = 0m/s
Let's get the acceleration
According to newton's second law;
[tex]\F_x = ma_x\\F_m - F_f = ma_x\\mgsin \theta - 0 = ma_x\\gsin\theta = a_x\\a_x = 9.8sin 60\\a_x = 9.8(0.8660)\\a_x = 8.49m/s^2[/tex]
Get the required time:
Recall that: S = ut + 1/2at²
Substitute the given parameters and find t
30 = 0(t) + 1/2(8.49)t²
30 = 4.24t²
t² = 30/4.24
t² = 7.08
t = √7.08
t = 2.66secs
Hence it take the box 2.66seconds to reach the ground
which is an example of non-renewable energy source?
a. petroleum
b. Solar energy
c. wind energy
d. geothermal energy
Answer:
Petroleum
Explanation:
Because Petroleum reservoirs can be depleted but something like wind energy wind will always be there
Answer: Petroleum
Explanation: Have a Good day!!
What is the motion of the particles in this kind of wave?
O The particles will move up and down over large areas.
O The partices will move up and down over small areas.
O The particles will move side to side over small areas.
O The particles will move side to side over large areas.
Answer:
a is correct
The particles will move up and down over large areas.
Answer:
B. The particles will move up and down over small areas.
Explanation:
I just took the quiz and got 100% :)
A ball is rolling down a track as shown. How fast must it be going at A in order to just make it to the top of B? The ball is at Peak A which is 5.0 m tall and wants to go to Peak B, which is 10.0m tall
Answer:
v = 98.1 m/s
Explanation:
We will apply the law of conservation of energy here, between peak A and peak B.
Total Energy of Ball at A = Total Energy of Ball at B
[tex]K.E_{A}+P.E_{A}=K.E_{B}+P.E_{B}\\where,\\K.E_{A} = Kinetic\ Energy\ of\ ball\ at\ Peak\ A = \frac{1}{2}mv^{2} \\K.E_{B} = Kinetic\ Energy\ of\ ball\ at\ Peak\ B = \frac{1}{2}m(0)^{2} = 0\ J (since, ball\ stops\ at\ last) \\[/tex]
[tex]P.E_{A} = Potential\ Energy\ of\ ball\ at\ Peak\ A = mgh_{A}\\P.E_{B} = Potential\ Energy\ of\ ball\ at\ Peak\ B = mgh_{B}[/tex]
[tex]\frac{1}{2}mv^{2} + mgh_{A} = 0\ J + mgh_{B}\\m(\frac{1}{2}v^{2} + gh_{A}) = mgh_{B}\\v = \sqrt{2g(h_{B}-h_{A})}\\where,\\h_{A} = height\ pf\ peak\ A = 5\ m\\h_{B} = height\ pf\ peak\ B = 10\ m\\v = \sqrt{2(9.81\ m/s^{2})(10\ m-5\ m)}\\[/tex]
v = 98.1 m/s
What type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system
Answer:
dark-field microscopy
Explanation:
A darkfield microscope can be regarded as a brightfield microscope with a significant modification to condenser. There is an opaque disk, with a diameter of about 1cm placed in between the illuminator and condenser lens, the disk responsible for the blocking of most of the light from the illuminator, passing through the condenser to objective lens , which will then form hollow cone of light that has its focus on the specimen. Using a darkfield microscope the light that get to the objective is the only refracted or reflected light of structures in the specimen. And the image formed usually display a bright object with a dark background.
It should be noted that darkfield microscope is a type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system.
How the frequency of ultraviolet radiation compares to that of visible light?
Ultraviolet (UV) "light" is a type of electromagnetic radiation. UV light has a shorter wavelength than visible light. ... The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 1012 hertz) and 30,000 THz.
If you're starting at the lowest frequency that our eyes can see, you're at RED light.
Then, as you hike through higher and higher frequencies, you travel through orange light, yellow light, green light, blue light, violet light.
Suddenly, as you keep going to higher frequency, you can't see the light any more. You've crossed the line from violet to ULTRAviolet. Now your eyes don't know it's there. The frequency is too high. (Wavelength is too short.)
HELP PLS I NEED THIS
Answer:
1.318m
Explanation:
The set up is a right angled triangle
Horizontal distance is the distance covered by the hurdler = 0.535m =adjacent
Angle of elevation = 67.9°
Height of the hurdler = opposite
Using the SOH CAH TOA identity
Using the TOA identity
Tan67.9° = opp/adj
Tan67.9 = opp/0.535
Opp = 0.535tan67.9°
Opp = 1.318m
Hence the required height is 1.318m
I NEED ANSWERS ASAP! IM GIVING 100 POINTS!
1. When weather predictions are incorrect, what is the most likely cause?
A) The person predicting the weather may have had a bias.
B) Small differences in models can lead to large differences in complex systems.
C) The elevation of different landforms may have been significantly inaccurate.
D) Measurements of the initial conditions may have been very inaccurate.
2. If climate change gradually made some weather models less accurate at predicting weather, what could be done with those models? (1 point)
A) Meteorologists could just add or subtract a little at the end if they knew by how much the models were off.
B) Meteorologists could use more computing time to generate more precise calculations.
C) It would be best to start over from present observations and create a new weather model.
D) Small changes could be made to the models that would greatly improved their ability to predict the weather.
3. Weather reports are able to forecast the percent chance of precipitation, although it is generally much more reliable in the Midwest of the United States (Nebraska, Kansas), than in the Pacific Northwest (Washington, Oregon). What is the most likely cause for this? (1 point)
A) Mountains and bodies of water make models more complicated in the Pacific Northwest.
B) In parts of the country where it rains more often, it is just easier to predict that it may rain, and that is often correct.
C) Data collection is better in the Midwest, leading to better predictions.
D) There is a bias in different parts of the country about weather.
4. The most difficult models involve phenomena that change very quickly. Which of the following models would involve the most challenging set of computations? (1 point)
A) stellar evolution
B) tornado formation
C) climate change
D) plate tectonics
5. An astronomer has used a computational model to predict the effects of two galaxies colliding. What would be the best way to find evidence that the model is valid? (1 point)
A) Wait for two galaxies to collide and watch what happens.
B) Have another group perform an independent test of the same model.
C) Repeat the computations many times and get an average.
D) Look at different examples of galaxy collisions in the universe.
PLEASE HELP!!!
Answer:
1.b 2.d 3.b 4.a 5.c
Explanation:
I tried my very best and I hoped these helped
Answer:
1. B
2.D
3.C
4.B
5.D
Explanation:
i'm not sure if these are correct but hope this helps
The Mass of a Body
Decreases when accelerated
Decreases when accelerated
Increases when accelerated
None of these
Answer:
Acceleration does not affect mass. Acceleration only affects weight.
Explanation:
Your mass is the same on Earth compared to on the moon, but your weight is going to be different because the acceleration due to gravity is going to be different.
a car of mass 1500kg collides with a wall. the initial and final speed of the car is -15m/s and 2.6m/s. if the collision last for 0.15 seconds. find the impulse caused by the collision and the average force on the car
Answer:
See the answers below.
Explanation:
In order to solve this problem we must use the principle of conservation of momentum and the amount of movement. Where the car moves to the left with a negative speed sign while the force of the collision will be taken to the right.
[tex]-m_{car}*v_{car1}+(F*t)=m_{car}*v_{car2}[/tex]
where:
Vcar1 = velocity of the car before the collision = - 15 [m/s]
F = impact force [N]
Vcar2 = velocity of the car after the collision = 2.6 [m/s]
[tex]-(1500*15)+(F*t)=(2.6*1500)\\F*t=22500+3900\\F*t=26400[kg*m/s][/tex]
Where the product of force by Time is equal to the impulse caused by the collision.
[tex]And the force\\F = P/t\\F=26400/0.15\\F=176000[N][/tex]
The data table shows how the amplitude of a mechanical wave varies with the energy it carries. Analyze the data to identify the mathematical relationship between amplitude and energy. Use your equation to find the energy if the amplitude is 8 units.
Amplitude
1
2
3
4
energy
2
8
18
32
A.66 units
B. 108 units
C. 128 units
D. 88 units
Answer:
E∝A²
Energy varies as square of change in amplitude
If amplitude of 1 has energy of 2
Amplitude of 2 (double of 1) = (2x2)=4x2=8 4 times the energy at amplitude of 1.
For 8 units of amplitude change
8x8=64x2= 128 or C:
Explanation:
When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.
The given parameters;
first amplitude, A = 1, corresponding energy = 2second amplitude, A = 2, corresponding energy = 8The energy of a string at a given amplitude is calculated as follows;
[tex]E = \frac{1}{2} kA^2\\\\\frac{E}{A^2} = \frac{E_1}{A_1^2}[/tex]
When the amplitude is 8, the energy of the wave is calculated as follows;
[tex]\frac{2}{1^2} = \frac{E_2}{8^2} \\\\E_2 = 2(8^2)\\\\E_2 = 2(64)\\\\E_2 = 128 \ units[/tex]
Thus, when the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.
Learn more here:https://brainly.com/question/21981451
Clarisse had three substances. A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flatten by hitting it with a hammer, but it did not crack. Which two statements could be true?
Answer:
The red substance was ionic. The white substance was molecular.
Explanation:
B.C.
If Clarisse had three substances, A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flattened by hitting it with a hammer, but it did not crack. the two true statements are the red substance was ionic and the white substance was molecular. therefore the correct option is B and D.
What is a Chemical compound?The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.
These chemical compounds are formed because of different types of bonds between the constituent's elements, the chemical bonds are mainly ionic bonds, covalent bonds,s, and hydrogen bonds.
Ionic bonds are formed due to the transfer of electrons between two bond-forming pairs differentiated by their electronegativity.
Covalent bonds are formed by the sharing of electrons. Generally, organic compounds are formed as the reason for covalent bonds.
As the white substance is waxy and malleable and the silvers substance could be flattened by hitting with a hammer but it did not crack it means the white substance is a metallic material that is molecular in nature , the red crystal is translucent and cracked when hit with a hammer this means it is ionic in nature.
Thus, the correct options are option B and option D.
Learn more about a chemical compound from here
brainly.com/question/12166462
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Please select the word from the list that best fits the definition
Is equal to mass multiplied by velocity
Answer:
Hi... Your answer is impulse
A cyclist speeds up from 3 m/s to 7 m/s in 8 seconds.
a. What is its change in velocity
Answer:
cant see to find the answer sorry :( i tried :( good luck !! youll do great <333
Explanation:
sorry ;( best of luck
Un carro parte del reposo y acelera uniformemente a 4.0 m / s^2 durante 5.0 s. A continuación, mantiene la velocidad que alcanzó durante 10 s. Luego, disminuye la velocidad a una velocidad constante de 2.0 m / s^2 durante 4.0 s.
Answer:
Average speed of the car = 16.53 m.s
Explanation:
For first 5 seconds:
As the car starts from rest, so the initial speed of the car, u=0
Acceleration, a= 4 m/s^2
So, the final speed (speed at time, t=5 second)
v=u+at
v=0 + 4 x 5 = 20 m/s
Distance covered,
[tex]s=ut+\frac 1 2 a t^2 \\\\s=0+\frac 1 2 \times 4 \times 5^2[/tex]
s=50 m
As the car maintained the constant speed of 20 m/s for the next 10 seconds.
Distance traveled in 10 seconds, d=20 x 10 =200 m
For the last 4 seconds:
The car slows down at the rate of 2.0 m / s ^ 2 from the speed of 20 m/s.
As the car slows down, so the acceleration will be negative, i.e a=-2 m/s^2
[tex]s=ut+\frac 12 at^2 \\\\s=20\times 4 +\frac 12 (-2)4^2[/tex]
s=80-16=64 m.
Considering all three cases, the total distance covered=
=50+200+64=314 m
Total time= 5+10+4=19 s
So, the averate peed= Totat distance covered / total time taken
=314/19=16.53 m/s
How can the speed of ripples in a ripple tank be changed
Answer:
By putting something like a sheet of glass in the water.
Explanation:
Putting a sheet of glass in the water will make the ripples move slower because the speed of a wave depends on the depth of water.
Please HELPPPPP!
A force is a push or a __. It causes an object at rest to __. It can cause an object that is moving to change __, or the distance covered over time. It can also change which way the object is moving its __. Lastly, it can also cause an object to __ moving completely. A force has both __ and direction. An object with __ forces or a net force of __ will not change position.
Word Bank:
Speed
Magnitude
balanced
Stop
Zero
Pull
Move
Direction
Answer:
A force is a push or a pull. It causes an object at rest to move. It can cause an object that is moving to change speed, or the distance covered over time. It can also change which way the object is moving its direction. Lastly, it can also cause an object to stop moving completely. A force has both magnitude and direction. An object with balance forces or a net force of zero will not change position.
Explanation:
A 25-newton horizontal force northward and a 35-
newton horizontal force southward act concurrently on
a 15-kilogram object on a frictionless surface. What is
the magnitude of the object's acceleration?
Answer:
2/3.or 0,67
Explanation:
acceleration = Result or sum of force / the mass
a = F/m
a = (35-25)/15
a = 10/15 = 2/3 m/s²
a = 0,67 m/s²