Answer:
its b
Explanation:
reaction takes place that is expected to yield 171.9 g of product, but only yields 154.8 g. What is the percent error for this experiment?
Answer:
9.95 percent
Explanation:
To get the percentage error, we use the following formula:
Percentage error = (expected output- actual output)/expected output X 100
Where
expected output: This is the mass of the end product after the chemical reaction that was expected = 171.9g
actual output: This is the mass of the end product after the chemical reaction that was observed = 154.8 g
Percentage error = [tex]\frac{171.9-154.8}{171.9} X 100= 9.95 percent[/tex]
Therefore the percentage error in the experiment is 9.95 percent.
The percent error for this experiment in which the reaction takes place to yield 171.9 g of product is 9.95%.
What is percentage of error?The difference between the measured or calculated value during the experiment or calculating and the known value is called the error. The percentage of error is the 100 times of this difference when divided with known value.
The expected value of the reaction to yield is 171.9 g of product. The experimental value of the reaction to yields is 154.8 g of product.
Thus, the percent error for this experiment
[tex]P=\left(\dfrac{171.9-154.8}{171.9}\right)\times100\\P=9.95\%[/tex]
Thus, the percent error for this experiment in which the reaction takes place to yield 171.9 g of product is 9.95%.
Learn more about the percentage of error here;
https://brainly.com/question/10218601
A student is watching a video in order to understand how convection in the mantle of the Earth occurs. The video shows rock rising and sinking to make convection currents in the mantle. Which process is responsible for causing rock to rise? A. Rock is heated. B. Rock rapidly cools off. C. Rock increases in density. D. Rock undergoes intense pressure.
Answer:
A
Explanation:
Because of the convectional currents
The tubes that go from the trachea into the lungs
How does a single fixed pulley, like the one seen here, help you do work?
A) Changes the direction of the force.
B) Increases the amount of applied force.
C) Decreases the amount of applied force.
D) Allows you to pull the rope a shorter distance.
Answer:
the answer will be B
Explanation:
because you are pulling the rope, pullimg applies FORCE. the bucket goes up because you applied FORCE
convert one mean solar day into second
Answer:
86400 seconds
Explanation:
To convert a mean solar day to second :
Number of hours in a solar day = 24 hours
Number of minutes per hour = 60 minutes
Number of seconds per minute = 60 minutes
Hence, the number of seconds in a solar day is :
(Number of hours in a solar day * number of minutes in an hour * number of seconds in a minute)
(24 * 60 * 60) seconds = 86400 seconds
Hence, 1 mean solar day = 86400 seconds
The temperature of boiling water cannot be measured by alcohol
thermometer.
Answer:
It can be measured by using laboratory thermometer.
the great pyramid of khufu (giza, egypt) is about 140m tall. How much work would be required to raise an average - sized pyramid black (2.5 tons) to this height?
The moon has approximately 1/6th the
gravitational pull that the earth has. If something
has a mass of 60kg on Earth, what is its mass on
the moon?
Answer:
m = 60 [kg] (mass on the moon)
Explanation:
We must remember that the mass is conserved, that is, it remains the same regardless of where it is located.
The only variation is the weight, which is different from the mass. Weight is determined by means of the product of mass by gravitational acceleration.
Therefore the mass of 60 [kg] on Earth will be the same mass on the moon.
A 10 kg wagon is accelerated by a constant force of 60 N from an initial velocity of 5.0 m/s to a final velocity of 11 m/s. What is the impulse received by the wagon? a)15 N s b)60 N s c)17 N s d)70 N s
A girl delivering newspapers covers her route by traveling 3.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. What is the total distance she travels?
Answer:
13 blocks
Explanation:
The total distance the student travels is 13 blocks.
Distance is the length of path covered during the motion of a body.
To find distance:
Total distance = Number of blocks to the west + number of blocks to the north + number of blocks to the east
Total distance = 3blocks + 4blocks + 6blocks = 13blocks
To find motion and distance time graph which formula we have to use please tell.
Answer:
umm nobody can solve this without a picture of what it is......
Explanation:
Give an example of the Law of Conservation of Energy. Explain your example
Answer: The law of conservation of energy can be seen in these everyday examples of energy transference: Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. This energy is then used to rotate the turbine of a generator to produce electricity.
Explanation: Thats what we learned
Hi can you help me with this please?
An eagle , initially at rest on the ground , lifts off vertically with a constant acceleration of 25 meters per square second . How long will it take the eagle to reach an altitude of 100 meters ?
Answer:
4s
Explanation:
My assumption would be 4s since 25 going into 100 would be 4? hope that helped..
This is a two part question: What is the force of friction acting on a 100 kg steel slab at rest on a steel floor?
None of the above
725.94N
559.2N
0N
A 5.5kg bowling ball is going down the lane at constant velocity of 30 m/s.What is the net force acting on the bowling ball?
165N
55N
30N
ON
What is the kinetic energy of a 0.150 kg
object moving at a velocity of 100m/s?
Answer:
750J
Explanation:
Given parameters:
Mass of the object = 0.15kg
Velocity of the object = 100m/s
Unknown:
Kinetic energy of the body = ?
Solution:
The kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass of the body
v is the velocity
Now insert the parameters and solve;
K.E = [tex]\frac{1}{2}[/tex] x 0.15 x 100² = 750J
Calculate the momentum of a 78 kg cheetah running at 24 m/s.
Answer:
1872 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 78 × 24
We have the final answer as
1872 kg.m/sHope this helps you
Please help in these 4 questions
Answer:
See the answers below.
Explanation:
1
The data of 100W means power, and the other data of 220V means voltage, that is to say that bulb serves to work at a voltage of 220V100W datum means power.
J means work that is given in Joules [J], we must remember that power is defined as the relationship between work at a certain time, therefore we can determine work by means of the following expression.
[tex]P=W/t\\[/tex]
where:
P = power [Watt]
W = work [J]
t = time [s]
[tex]W=P*t\\W=100*5[hr]*[\frac{3600s}{1hr} ]\\W=1800000[J] = 1.8[MJ][/tex]
Now the electric cost.
[tex]0.1[kW]*5[hr]*55\frac{LL}{1kwhr} =27.5[LL][/tex]
2
We know that power is defined as the product of voltage by resistance.
[tex]P=V*I[/tex]
where:
P = power [W]
V = voltage [V]
I = current [amp]
[tex]I=P/V\\I=1500/220\\I=6.82[amp][/tex]
3
The voltage can be calculated by means of ohm's law, which tells us that the voltage is equal to the product of resistance by the current.
[tex]V =I*R[/tex]
where:
V = voltage [V]
I = current = 20 [mA] = 0.02 [A]
R = resistance = 20 [kΩ] = 20000 [Ω]
Now replacing:
[tex]V = 0.02*20000\\V = 400 [V][/tex]
4
According to the figure we see that when the current is equal to 10 [mA] the voltage is equal to 1 [V]. With these two values, we can use ohm's law and find the value for the resistance.
[tex]V = I*R\\R = V/I\\R = 1/0.01\\R =100 [ohm][/tex]
A person wants to find the width of the lake by shouting and listening for the echo from the far side. If his echo returns after 2 seconds how wide is the lake? (Velocity of sound is 340 m/sec)
Answer:
The width of the lake is 340 m
Explanation:
Constant Velocity Motion
It occurs when an object travels the same distance every equal interval. For example, if it travels 5 m in one second, then 10 m in two seconds, etc., it has a constant velocity.
The speed of the sound is assumed as v=340 m/s and the person measures the time that a sound goes and comes from the edge of a lake as t=2 seconds. The distance it travels is:
d = v.t
d = 340 m/s * 2 s
d = 680 m
But that distance is twice the width of the lake, the real measured width is 680 m / 2 = 340 m
The width of the lake is 340 m
I have like 3 min !!!
Answer:
to talk??? i will talk with you
Explain how to change the pitch of the sound produced by a violin string when it is plucked or rubbed with the bow.
Answer:
Sound is produced by moving the bow over the string or by plucking it with the right hand. Pitch alterations are achieved by pressing down the string with the fingertips of the left hand on the fingerboard. This shortens the vibrating portion of the string and raises the pitch
Explanation:
3. Reducing the distance between two objects to 1/2 its original value will
a. Make the gravitational force between the objects twice its original value,
B. Make the gravitational force between the objects 1/4 of its original value,
C) Make the gravitational force between the objects 4 times its original value,
D. Make the gravitational force between the objects of its 1/2 original value,
Answer:
i my though may it is auestion no B i am not correct may its write
Explanation:
B
help please 10 pts and quick!
Answer:
B
Explanation:
Answer:
B
Explanation:
Find the mass of an object the accelerates at 3.4 m/s2 when a net force of 25.1 N force is applied to it. Answer in units of kg and include all necessary work.
Help Please
Given,
Acceleration of the object = 3.4 m/s²Net force = 25.1 NWe need to find,
Mass of the body = ?Using Newton's first law of motion .
Force = Mass × Acceleration➵ 25.1 = Mass × 3.4
➵ 25.1 ÷ 3.4 = Mass
➵ Mass = 7.38 kg
Choose the sequence of energy forms that best fits each item.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
1.FLASHLIGHT:
chemical energy --> electrical energy --> light energy
The chemical energy from the cell batteries is converted to electrical energy, which is used to produce the light energy in form of flashlight.
2.ELECTRIC SAW:
Electrical Energy --> Mechanical Energy
The electrical energy from the socket is converted to the mechanical energy used to run the saw blade.
3.TOASTER:
Electrical Energy --> Heat Energy
The electrical energy from the socket is converted to the heat energy (thermal energy) used in browning the bread.
4.GAS POWERED SCOOTER:
Chemical Energy --> Thermal Energy --> Mechanical Energy
The chemical energy from fuel, such as petrol is converted to heat (thermal energy) in the engine by the process of combustion. This heat is then used to do work by conversion into mechanical energy, through piston movement, which in turn moves the shaft and the scooter.
5.THE SUN:
Nuclear Energy --> Light energy and thermal energy
The nuclear reactions on Sun provide nuclear energy which is converted into light and thermal energy that reaches us on earth.
6.WIND TURBINE:
Mechanical Energy --> Electric Energy
The mechanical energy is provided by wind when it rotates the blade of turbine. This is then converted to electrical energy b the turbine.
7.IPOD:
Chemical Energy --> Electrical Energy --> Sound Energy
The chemical energy i supplied by the battery of ipod, which is converted to electrical energy and that electrical energy is used to produce sound by ipod.
8.SPEAKER VIBRATES
Mechanical Energy --> Sound Energy
The mechanical energy due to vibration produces sound energy.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s.
a. How long does it take to reach the ground?
b. How far does the rock land from the base of the cliff?
Answer:
a. The rock takes 2.02 seconds to hit the ground
b. The rock lands at 20,2 m from the base of the cliff
Explanation:
Horizontal motion occurs when an object is thrown horizontally with an initial speed v from a height h above the ground. When it happens, the object moves through a curved path determined by gravity until it hits the ground.
The time taken by the object to hit the ground is calculated by:
[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]
The range is defined as the maximum horizontal distance traveled by the object and it can be calculated as follows:
[tex]\displaystyle d=v.t[/tex]
The man is standing on the edge of the h=20 m cliff and throws a rock with a horizontal speed of v=10 m/s.
a,
The time taken by the rock to reach the ground is:
[tex]\displaystyle t=\sqrt{\frac{2*20}{9.8}}[/tex]
[tex]\displaystyle t=\sqrt{4.0816}[/tex]
t = 2.02 s
The rock takes 2.02 seconds to hit the ground
b.
The range is calculated now:
[tex]\displaystyle d=10\cdot 2.02[/tex]
d = 20.2 m
The rock lands at 20,2 m from the base of the cliff
b. The coefficient of friction between the tires and the road is 0.850 and the mass of the car is
1.35x10' kg. Draw the free body diagram of this situation and determine the applied force
that caused the acceleration from part a. (2 law: Fnet-ma)
Given:
u
בנו
Samt
g=9.8 m/s^2
am
(from part a)
Unknown:
Fapp = ?
Equation:
Fnet=ma
Fapp- umg=ma
Solution:
Answer:
156.26N
Explanation:
The data needed are incomplete. Let the acceleration of the body be 3.5m/s²
Other given parameters
Mass = 1.35×10^1 = 13.5kg
coefficient of friction between the tires and the road = 0.850
Acceleration due to gravity = 9.8m/s²
According to Newton's second law:
Fnet = ma
Fnet = Fapp - Ff
Fapp is the applied force
Ff is the frictional force = umg
The equation becomes:
Fapp - Ff = ma
Fapp-umg = ma
Fapp - 0.85(13.5)(9.8) = 13.5(3.5)
Fapp - 109.0125 = 47.25
Fapp = 47.25+109.0125
Fapp = 156.2625N
Hence the applied force that caused the acceleration is 156.26N
Note that the acceleration of the car was assumed. Any value of acceleration can be used for the calculation.
Which of these best defend defines whethera atomic fear contains over 30-year period b day-to-day conditions with the weather see long-term conditions of the atmosphere and the average
Answer: Climate
Explanation:
The climate is the constant condition of the atmosphere of a particular condition for a period of 30 years. It consider atmosphere for relatively long periods of time.
The averages of precipitation, humidity, wind speed, temperature, rainfall are considered while knowing the status of climate of a particular region or location. Other parameters like fog, hail storms, and frost are also measured.
A light bounces off the surface of a metal cup and shines in Harold’s eyes. Which best describes what is happening to the light waves in this scenario?
absorption
interference
refraction
reflection
Answer:
Reflection
Explanation:
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound, and water waves.
Answer:
d
Explanation:
Why does your weight change on the moon
Answer:
the moon has different gravitational force.
Answer:
Our weight on moon is less than it would be on Earth due to a difference of the strength of gravity on the moon. The moon's gravitation force is determined by the mass and the size of the moon. ... This means that if you went to the moon you would weigh less, even though your mass stays the same!
Explanation:
Please mark brainliest
if a Man suit a spare at a place where
the sea the fish inside the water is it possible that it will heat the fish give reason
Answer:
Yes
Explanation: