Answers
Answer:
b i. The curve would be less steep than both of the graphs.
c. The temperature was the same at the start of the experiment so that the only variable changed in the experiment would be the thickness of the walls and the change in temperature can be measured from the same starting temperature, ensuring a fair experiment.
Explanation:
b i. Since you know that a thicker wall conducts heat from the inside room to the surroundings slower (based on my previous answer ;)), heat from the room would be conducted to the surroundings by the thicker wall slower and the temperature change will be less drastic and the graph would be less steep.
c. In an experiment, only one independent variable can be changed and we would normally record the dependent variable to get a conclusion for the experiment as the dependent variable is the variable that is affected by the independent variable. We should not change any other variable in the experiment, such as the starting temperature of the experiment.
For e.g. If you want to find out how the amount of water affects a plant's growth, the amount of water would be the independent variable and that would be the only thing you would change in that experiment. During the experiment, you would record the dependent variable, which is the height of the plant. The type of plants used and the type of soil..etc should be kept the same/constant so that it is a fair experiment, as a better type of soil may make the plant grow taller.
Related Questions
A cat becomes negatively charged when it is brushed. How does the electric charge on the brush compare to the charge on the cat?
Answers
Answer:
The electric charge on the brush is now positive. This means that if the object it light enough (like a balloon) it would stick to the wall.
This is fun science actually.
Explanation:
May I have brainliest please? :)
please help urgent
Four forces are exerted on an object as shown below:
look at attachment
In which direction will the object move?
Up
Down
Left
Right
Answers
A book is placed on a table and a bike moves on a road. Which statement is correct? (3 points)
Answers
The book has potential energy (Pe) and the bike has kinetic energy (Ke).
Answer:
C
Explanation:
The book has potential energy and the bike has kinetic energy.
A jet liner must reach a speed of 82 m/s for takeoff. If the
runway is 1500 m long, what acceleration must the jet
have?
Answers
Answer:
The acceleration that the jet liner that must have is 2.241 meters per square second.
Explanation:
Let suppose that the jet liner accelerates uniformly. From statement we know the initial ([tex]v_{o}[/tex]) and final speeds ([tex]v_{f}[/tex]), measured in meters per second, of the aircraft and likewise the runway length ([tex]d[/tex]), measured in meters. The following kinematic equation is used to calculate the minimum acceleration needed ([tex]a[/tex]), measured in meters per square second:
[tex]a = \frac{v_{f}^{2}-v_{o}^{2}}{2\cdot d}[/tex]
If we know that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]v_{f} = 82\,\frac{m}{s}[/tex] and [tex]d = 1500\,m[/tex], then the acceleration that the jet must have is:
[tex]a = \frac{\left(82\,\frac{m}{s} \right)^{2}-\left(0\,\frac{m}{s} \right)^{2}}{2\cdot (1500\,m)}[/tex]
[tex]a = 2.241\,\frac{m}{s^{2}}[/tex]
The acceleration that the jet liner that must have is 2.241 meters per square second.
** ANSWER IS A** As you move from left to right across Period 3, which statement is true of the number of
valence electrons as you move from one main-group element to the next?
A. The number of valence electrons increases by 1.
B. The number of valence electrons decreases by 1.
C. The number of valence electrons increases by a multiple of 2.
D. The number of valence electrons decreases by a multiple of 2.
Answers
Answer:
A. The number of valence electrons increases by 1.
Explanation:
As you move across any period on the periodic table, the number of valence electrons increases by a value of 1.
The periodic table of elements contains an arrangement of element by their atomic numbers. From left to right, number of valence electrons increases. Down a group, the valence electrons are the same. Across a period, the number of valence electrons increases.Answer:
READ YOUR QUESTION CAREFULLY:
If it says left to right, the answer is A. The number of valence electrons increases by 1.
If it says right to left, the answer is B. The number of valence electrons decreases by 1.
Good luck :)
True or False: A cloud’s only purpose is to create precipitation.
Answers
Answer:
I think it's false
Explanation:
clouds also help regulate the Earth's energy balance by reflecting and scattering solar radiation and by absorbing the Earth's infrared radiation.
Answer:
false
Explanation:
Find the unit vector in the direction of vector A=4i +3j
Answers
Answer:
[tex]\displaystyle \vec u_A=\frac{4}{5}\hat i +\frac{3}{5}\hat j[/tex]
Explanation:
Unit Vector
The unit vector associated with a given vector [tex]\vec a[/tex] is another vector pointing in the same direction of [tex]\vec a[/tex] and with magnitude 1.
The unit vector can be calculated as follows:
[tex]\displaystyle \vec u_a=\frac{\vec a }{||\vec a ||}[/tex]
Where [tex]||\vec a ||[/tex] is the magnitude of the vector.
If [tex]\vec a[/tex] is given as:
[tex]\vec a = x\hat i +y\hat j[/tex]
The magnitude of the vector is:
[tex]{||\vec a ||}=\sqrt{x^2+y^2}[/tex]
We have:
[tex]\vec A=4\hat i +3\hat j[/tex]
[tex]{||\vec a ||}=\sqrt{4^2+3^2}=\sqrt{25}=5[/tex]
Thus the unit vector is:
[tex]\displaystyle \vec u_A=\frac{4\hat i +3\hat j }{5}[/tex]
Simplifying:
[tex]\mathbf{\displaystyle \vec u_A=\frac{4}{5}\hat i +\frac{3}{5}\hat j}[/tex]
true or false. A small pick-up truck traveling at 55 km/h has more momentum than a full-sized bus traveling at the same speed
Answers
Answer: true
because the small truck is going fast and has momentum, so the bus and the truck have the same amount of momentum.
Which of the following is a limited resource
Answers
The option that can be considered a limited resources is A: fertile soil.
Limited resources can be regarded as can be regarded as finite quantities of productive resources that can be considered to be available for economy.This resources can be considered to be part of fundamental problem of scarcity that humanity has experienced, Fertile soil can be regarded as limited resources among the option.Therefore, option A is correct.
Learn more at:
https://brainly.com/question/439768?referrer=searchResults
Answer:
fertile soil
Explanation:
trust
Which statement best describes physical properties?
Answers
Answer:
Where are the statements?
Explanation:
PLEASE HELP!!! ILL MARK BRAINLYEST!!
How many atoms are in 5 C?
7
5
3
4
6
Answers
Answer:
Explanation:
3.011 x 10^24 atoms
Answer:
jskskskssksksksskssksksksksks
Two 5.0-kg carts collide on a one-dimensional air track. The total momentum of the carts was 4.9 kg m/s rightwards before the collision. After the collision, one cart is moving leftwards at 0.15 m/s. what is the velocity of the second cart?
Answers
Answer:
1.13 m/s right
Explanation:
Momentum before = momentum after
p₀ = p
p₀ = m₁ v₁ + m₂ v₂
4.9 kg m/s = (5.0 kg) (-0.15 m/s) + (5.0 kg) v
4.9 kg m/s = -0.75 kg m/s + (5.0 kg) v
5.65 kg m/s = (5.0 kg) v
v = 1.13 m/s
Answer: 1.13 m/s equivalent to 1.1 m/s
Explanation:
Is this physically plausible?
Answers
Answer:
stop useing my awnsers just to deleate them
Explanation:
A ball rolls of a building that is 100 m high. Calculate the time it takes to hit the ground.
Answers
Answer:
2as=v2-u2
2000=v2
V=44
V=u+at
44/10=t
T=4.4seconds
Explanation:
Convert the normal temperature of human body from Celcius to Kelvin
and Fahrenheit scale.
Answers
Answer:
the normal human body temperature in Celcius is 37°C, in Fahrenheit is 98.6°F, in Kelvin is 310°K
What is the correct interpretation of this diagram?
Forces from the left and the right are unbalanced. The object moves left.
Up and down forces are balanced. The force toward the right is greater than the force toward the left. The object will move toward the right.
Up and down forces are balanced. The object does not move.
Up and down forces are balanced. The force toward the right is greater than the force toward the left. The object will move toward the left.
Answers
Answer:
where is the diagram?
Explanation:
here is the diagram
hope this helps a little cuz i cant paste pictures here
Four directional arrows with labels five hundred seventy-nine Newtons, four hundred eighty-seven Newtons, five hundred seventy-nine Newtons and six hundred thirty-two Newtons
Potential energy is energy that is stored in a system. Kinetic energy is energy of motion. Energy
can be transformed from potential energy to kinetic energy, or vice versa.
Energy is a quantity that
can be measured. The joule is the unit used to measure energy, represented by J.
Potential energy (PE) = 9.8 (m/s2) x mass (kg) x height (m)
(where 9.8 is the acceleration due to gravity)
Kinetic energy (KE) = 0.5 x mass (kg) x speed? (m/s)
Delany is getting ready to race her soapbox car down a hill. The car weighs 60 kg. Delany
weighs 35 kg. The height of the hill is 3.5 meters. Write and solve the equation for the
potential energy of the car, with Delaney in it, before sliding down the hill.
1.
Answers
Answer:
P.E =mgh
k.E =1/2mv^2
Explanation:
PE increases with increasing height whereas KE increases with increasing speed
Which of the following objects has no kinetic energy ?
Answers
Answer:
delivery truck
Explanation:
All the objects such as delivery truck stopped at a light has no kinetic energy. Thus, the correct option is A.
What is Kinetic energy?Kinetic energy is the energy of motion, it is observable as the movement of an object or the subatomic particles of an object. Every moving object and particle have certain amount of kinetic energy. A person who is walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of the kinetic energy at work.
The example in which the delivery truck stopped at a light is an example which has no kinetic energy. Kinetic energy is due to motion of the object.
Therefore, the correct option is A.
Learn more about Kinetic energy here:
https://brainly.com/question/26472013
#SPJ6
Your question is incomplete, most probably the complete question is:
Which of the following objects has no kinetic energy?
a. delivery truck stopped at a light
b. eagle in flight over a park
c. cannonball fired from a cannon
d. diver falling from a diver board
1. A soccer ball is kicked horizontally off a cliff with an initial speed of 8 m/s and lands 16 m from the base of
the cliff. What is the height of the cliff?
Answers
Answer:
Height of cliff = S = 20 m (Approx)
Explanation:
Given:
Initial velocity = 8 m/s
Distance s = 16 m
Starting acceleration (a) = 0
Computation:
s = ut + 1/2a(t)²
16 = 8t
t = 2 sec
Height of cliff = S
Gravitational acceleration = 10 m/s
S = 1/2a(t)²
S = 1/2(10)(2)²
Height of cliff = S = 20 m (Approx)
I need the answer to number #23 please will give BRAINLIEST
Answers
Please help me↓
This topographical map has contour lines 5 ft of elevation (height above sea level) apart; the numbers on the thicker lines are elevation in feet. What is the difference in elevation between the two points marked?
Point II is 45 ft lower.
Point II is 10 ft lower.
Point II is 10 ft higher.
Point II is 45 ft higher.
Answers
Answer:
unmmm u can say that it is going mt 15s
Answer: Did you get the answer?
Explanation:
Oxygen is the most abundant gas in Earth’s atmosphere true or false
Answers
Answer: false
Explanation:
Nitrogen is actually the most abundant gas in the atmosphere.
The answer to the question is false. Hope this helps you!
Answer:
false.
Explanation:
The most abundant gas in the Earth's atmosphere is nitrogen.
A ray of light passes from air into a block of glass. Does it bend towards or away from the normal?
Answers
Answer:
Away from the normal
Explanation:
Light travelling from a less dense medium to a denser medium refracts away from the normal; which is why objects in water appear closer to the surface.A classmate is attempting to draw a free body diagram for a box being pushed across the floor at a constant speed. The image below is what
they have drawn so far.
Which (if any) of their forces have been drawn incorrectly
O A. The applied force should be the same size as the friction force
B. There is nothing wrong with the free body diagram
OC. The normal force should be larger than the force and gravity
OD. The friction force should be in the same direction as the applied force
Answers
Answer:
A. The applied force should be the same size as the friction force
Explanation:
Whenever we apply a force to an object it moves if the force applied to that object is unbalanced and there is no force or a lesser force to counter it. According to Newton's Second Law of motion, when an unbalanced force is applied to an object it produces an acceleration in the object in its own direction. So, the two forces acting on this box are the frictional force and the applied force in horizontal direction. In order to move the box at constant speed, the applied force must first, overcome the frictional force, so the object can start its motion. Since, the motion has constant velocity, it means no acceleration. So, the force must be balanced in order to avoid acceleration as a consequence of Newton's Second Law of motion. Therefore, the correction in this case will be:
A. The applied force should be the same size as the friction force
You are interested in space travel and want to learn more facts about space travel.
Which would be the best source of information? (2 points)
The Star Wars web page NASA web page
A book about planets
A magazine article
Answers
Answer:
A Book about Planets
Explanation:
Answer:
Nasa web page
Explanation:
Objects change motion due to forces. When they become unbalanced, their motion changes, while balanced forces cause constant motion. Unbalanced forces result in a change of velocity. What is it called when velocity changes?
Answers
Answer:
Balanced forces: When a number of forces acting on a body do not cause any change in its state of rest or of uniform motion along a straight line then the forces are said to be balanced forces. In other words, a body is said to be underbalanced forced when the resulting force acting on the body is zero.
The balanced forces:
⋅ Cannot set any stationary body into motion.
⋅ May change the shape and size of soft objects.
⋅ Cannot change the speed/velocity of a moving body.
Unbalanced forces:
When the resultant of all the forces acting on a body is not zero, then forces are called unbalanced forces.
Example:
⋅ Game of tug of war: When the forces exerted by both the teams are equal, then the rope does not move. But, if the force applied by team A is greater than team B, then the rope, as well as members of the weaker team, i.e., B, will be pulled towards A. The unbalanced force can (a) Set a stationary body in motion.
⋅ Set a moving body at rest.
⋅ Change the direction of motion.
Explanation:
give me an one thanks please
i honeslty just need the answer .
Answers
Answer:
38Watts
Explanation:
Given parameters:
Mass = 75kg
height = 8.5m
time = 165s
Unknown:
Power = ?
Solution:
Power is the rate at which work is done.
Power = [tex]\frac{work done}{time}[/tex]
Work done = mgh
m is the mass
g is the acceleration due to gravity = 9.8m/s²
h is the height
Now insert the parameters and solve;
P = [tex]\frac{75 x 9.8 x 8.5}{165}[/tex] = 38Watts
Determine the activity of the sample of cerium when the sample was 20 seconds old
Answers
Answer:
There are [tex]3.779\times 10^{23}[/tex] atoms when the sample of cerium is 20 seconds old.
Explanation:
The decay of isotopes is modelled after the following exponential expression:
[tex]N(t) = N_{o}\cdot e^{-\left(\frac{\ln 2}{t_{1/2}}\right)\cdot t }[/tex] (1)
Where:
[tex]N_{o}[/tex] - Initial number of atoms, dimensionless.
[tex]N(t)[/tex] - Current number of atoms, dimensionless.
[tex]t[/tex] - Time, measured in seconds.
[tex]t_{1/2}[/tex] - Half-time, measured in seconds.
Now we clear the half-time within (1):
[tex]\ln \frac{N(t)}{N_{o}} = -\frac{t\cdot \ln 2}{t_{1/2}}[/tex]
[tex]t_{1/2} = -\frac{t\cdot \ln 2}{\ln \frac{N(t)}{N_{o}} }[/tex]
If we know that [tex]N_{o} = 5\times 10^{23}[/tex], [tex]N(t) = 2\times 10^{23}[/tex] and [tex]t = 66\,s[/tex], then the half-life of the isotope is:
[tex]t_{1/2}=-\frac{(66\,s)\cdot \ln 2}{\ln \frac{2}{5} }[/tex]
[tex]t_{1/2}\approx 49.927\,s[/tex]
And the decay equation for the sample is described by:
[tex]N(t) = (5\times 10^{23})\cdot e^{-0.014\cdot t}[/tex]
Lastly, if we get that [tex]t = 20\,s[/tex], then the activity of the sample of cerium is:
[tex]N(20) = (5\times 10^{23})\cdot e^{(-0.014)\cdot (20)}[/tex]
[tex]N (20) \approx 3.779\times 10^{23}[/tex]
There are [tex]3.779\times 10^{23}[/tex] atoms when the sample of cerium is 20 seconds old.
Do ocean currents affect aquatic life? What do you think and why?
Answers
Answer: By moving heat from the equator toward the poles, ocean currents play an important role in controlling the climate. Ocean currents are also critically important to sea life.
Explanation: Plzz mark me as brainliest !!
Conduction In Everyday Life Examples
at least 5 plz help
Answers
1. Heat transfer from a hot burner on the stove into a pot or pan
2. A metal spoon that gets hot from the boiling water
3. Chocolate candy in your hand that melts because of the heat
4. The wires in your house that conduct electricity
5. Roasting marshmallows, the heat will soften the marshmallow
Answer:
the engine heat from a car you just turned on.
a heater
a pad warmer
a hot pot
using a campfire to roast hot dogs