Answer:
8
Explanation:
1.0 × 3.1 × 2.5 = 7.75 cm^3
nearest tenth 8cm^3
Please answer:
Galileo, in order to measure the speed of light, performed this simple
experiment: He and his assistant each took a lantern that had a shutter in front of it,
and stood on hilltops one mile apart in the night.
Galileo was to flash his lantern, and the assistant was to open the shutter of his own
lantern as soon as he saw the light from Galileo's lantern. Galileo had planned to
measure the time taken for light to travel from one hill to the other and back, and
calculate the speed of light using the formula, Speed = distance traveled / time
taken But he could not measure the speed of light using this method. What could
have been the reason for this?
A. The distance between the two hills was too much for them to see the light from
the other person's lantern.
B. Light does not travel in straight lines and so the distance traveled by it cannot
be measured.
C. The time taken for the light to travel would have been too little to have been
measured by them.
D. Light does not travel because it is present everywhere, so its 'speed' cannot be
calculated
I asked this question before also please answer
Answer: C. The time taken for the light to travel would have been too little to have been measured by them.
Explanation:
Light travels at a speed of 300,000 km per second which is much too fast for the naked eye to even comprehend. This is why light shinning in a distance is picked up instantaneously by out eyes.
This experiment done by Galileo would therefore be unable to measure the speed of light because the light from either lantern would have traveled too fast for Galileo to be able to measure the time taken.
write down local units of mass?
Answer:
Explanation: local unit of mass is kilogram
Which of the following is a personal decision that involves science?
A. Will vitamins help me sleep better?
B. Is it fun to ride a train across the country? C. Should I live in an apartment or a house?
D. Are black or white laptops better looking?
A gas sample occupies 6.2 L at a pressure of 201 kPa. What volume will it occupy if the pressure is increased to 335 kPa? The temperature remains the same.
Answer: The volume of the gas at the increased pressure will decrease to 3.72L.
Explanation:
Boyle's law states that the volume occupied by a fixed mass of gas is inversely proportional to the pressure, provided temperature is kept constant. That is,
PV=K
P1V1 =P2V2
P1= 201 kpa
V1 = 6.2L
P2= 335kpa
V2= ?
Making V2 the subject of formula,
V2= P1V1/P2
V2= 201× 6.2/335
V2= 1246.2/336
V2= 3.72L
Thus, the volume of the gas decreases as the pressure increases. Hope this helps, thanks
Answer:
The volume will be 3.72 L.
Explanation:
We can find the new volume by using the Ideal Gas Law:
[tex] PV = nRT [/tex]
Where:
P: is the pressure
V: is the volume
n: is the number of moles
R: is the gas constant
T: is the temperature
Initially, we have:
[tex]P_{1}V_{1} = nRT[/tex] (1)
with V₁ = 6.2 L, P₁ = 201 kPa and nRT = constant
When the pressure is increased we have:
[tex] P_{2}V_{2} = nRT [/tex] (2)
with V₂ =?, P₂ = 335 kPa and nRT = constant
By equating (1) and (2) we have:
[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]
[tex] V_{2} = \frac{P_{1}V_{1}}{P_{2}} = \frac{201 kPa*6.2 L}{335 kPa} = 3.72 L [/tex]
Therefore, the pressure is increased to 335 kPa the volume will be 3.72 L.
I hope it helps you!
HELP ASAP!! WILL TRY TO GIVE BRAINLIEST
How are facilitated diffusion and active transport similar and different?
Answer:
Facilitated diffusion and active transport both utilize proteins to transport substances across membranes. Differences between active transport and facilitated diffusion 1. Active transport requires an input of energy, usually ATP, while facilitated transport does not.
A container of height 30cm has a capacity of 1.5litres. What is the height of similar container of capacity 3m^3.
Answer:
Height = 378 cmExplanation:
see image
will give Brainliest to correct
the original source of all sand is:
beaches
oceans
rocks
rivers
Answer:
The original source of all sand is rocks.
Hope I helped sorry if I didnt
Answer:
answer is rocks
Explanation:
It’s rocks because all sand it Little Rock’s that have been smashed into smaller pieces over the years and decade, and that’s how rivers go sand to because some of the broke down rocks would fall into the river and eventually be carried in the ocean and washed in shore. And that’s how we got beaches
Which of the following is true about the plants in the picture below?*
5 points
Tall is represented by (T) and short is represented by (t).
TT
Tt
They have the same phenotypes
They have the same genotypes.
They have the same alleles.
They are both short
Explanation:
We know that for the plant;
Tall is represented by T
Short is represented t
Phenotypically, TT and Tt have the same expression.
The phenotype of an organism denotes the observable feature it possesses. Although determined by the genetic composition but the environment plays a very important role in its expression.
The genotype is the genetic make up of an organism. TT and Tt denotes the genes that occupy positions in the nucleus of the cell.
Both TT and Tt shows that the organism is tall. t is short and recessive.
An icicle falls off of a skyscraper from rest and falls for 34 seconds. How far did the icicle fall? Show all work and units. (a = g = 9.81 m/s^2) *
Explanation:
u = 0.0m/s
t = 34s
a = 9.81m/s²
Using Kinematics,
s = ut + 0.5at²
= 0 + 0.5(9.81)(34)²
= 5,670.18m.
Which of the following substances can be separated into several elements?
A. nitrogen B. zinc
C. air D. aluminum
Answer: C
Explanation: Air
Hope this helps! Brainlist Plz?
The following substances can be separated into several elements is the air because consisting of a mixture of several gases, such as nitrogen, oxygen, carbon dioxide and noble gases.
What is air composed of?Atmospheric air is made up of a mixture of several gases, such as nitrogen, oxygen, carbon dioxide and noble gases. Oxygen and nitrogen are the most abundant gases, with the other gases being found in smaller amounts.
So the only element that we can separate into is air, because when performing the separation we find oxygen, nitrogen, carbon dioxide and noble gases.
See more about air at brainly.com/question/19368011
#SPJ2
A new copy of DNA is built from individual genes . The enzyme unwinds the DNA molecule, allowing replication to begin.
Answer:
This question is incomplete, the question is asking which enzyme unwinds the DNA molecule during DNA replication.
The answer is DNA HELICASE
Explanation:
DNA replication is the process whereby DNA molecule (genetic material) is duplicated in the genome i.e. DNA makes an identical copy of itself. The process of DNA replication is carried out in a step by step manner with various enzymes functioning specifically throughout the process.
The first step is to unwind the double-stranded DNA molecule into two single strands. The two single strands serves a templates to synthesize another pairing strand to make two DNA molecules in total. The unwinding of the DNA strands is carried out by an enzyme called DNA helicase.
Answer:
A new copy of DNA is built from individual
✔ nucleotides
.
The enzyme
✔ helicase
unwinds the DNA molecule, allowing replication to begin.
Explanation:
A cruise started its trip 8:00. its average speed was 100 km/h. when it traveled 2/5 of its journey by 12:00, the boat changed its speed. if the boat was required to arrive at the destination at 17:00 what average speed must the boat travel at for the remaining journey?
Answer:
Explanation:idk
A lamp draws a current of 20 A when it is connected to a 100 V source? What is the resistance of the lamp?
Explanation:
R = V / I = 100V / 20A = 5 ohms.
Explain how to find the acceleration of an object that has one-dimensional horizontal motion.
If a car has a kinetic energy of 40000 J and is moving at a velocity of 25 m/s, what is the mass of the car? KE=1/2mv
Answer:
3200 Kg
Explanation:
Just apply the formula:
40.000 = 1/2 . m . 25
80.000 = 25m
m = 80.000/25
m = 3200 Kg
Four identical bulbs are set up in a series circuit with an 8V battery. The voltage across each bulb is...
Explanation:
Voltage across each bulb = 8V / 4 = 2V (Potential difference)
Answer:
2 (8 ÷ 4) volts.
According to the passage, in a series circuit, “the voltage is shared across all the bulbs.” If the bulbs are of equal resistance, the voltage across each will be ¼ of the battery’s 8 volts or 2 volts.
i got it right on flocabulary.com
Explanation:
Suppose a current flows through a copper wire. Which two things occur?
A. The field is perpendicular to the direction of flow of the current.
B. The field is parallel to the direction of flow of the current.
C. A magnetic field forms around the wire.
D. An electric field forms around the wire.
A magnetic field forms around the wire. and The field is perpendicular to the direction of flow of the current.
What is Magnetic field?
A magnetic field is a visual representation of how the magnetic force is distributed around and inside of magnetic objects.
Most people are at least somewhat familiar with common magnetic items and are aware that there may be forces at work between them.
We are aware that magnets have two poles and that the attraction or repulsion between two magnets depends on how they are oriented (similar poles). We are aware that this occurs in a certain area that surrounds a magnet.
Therefore, A magnetic field forms around the wire. and The field is perpendicular to the direction of flow of the current.
To learn more about magnetic field, refer to the link:
https://brainly.com/question/15719243
#SPJ2
What is the direction of the centripetal force when applied to an object?
Answer:
It would move in a line tangent to the circular path
Explanation:
A 45kg skater and a 60kg skater are standing still, holding hands on frictionless ice. They push away from each other in opposite directions. If the 45kg skater was measured traveling at 3.5 m/s, how fast was the 60 kg skater traveling?
Answer:
The 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.
Explanation:
The velocity of the 60 kg skater can be found by conservation of linear momentum:
[tex]P_{i} = P_{f}[/tex]
[tex]m_{a}v_{i_{a}} + m_{b}v_{i_{b}} = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}[/tex] (1)
Where:
[tex]m_{a}[/tex]: is the mass of the first skater = 45 kg
[tex]m_{b}[/tex]: is the mass of the second skater = 60 kg
[tex]v_{i_{a}}[/tex]: is the initial speed of the first skater = 0 (he is standing still)
[tex]v_{i_{b}}[/tex]: is the initial speed of the second skater = 0 (he is standing still)
[tex]v_{f_{a}}[/tex]: is the final speed of the first skater = 3.5 m/s
[tex]v_{f_{b}}[/tex]: is the final speed of the second skater =?
By replacing the above values into equation (1) and solving for [tex]v_{f_{b}}[/tex] we have:
[tex]0 = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}[/tex]
[tex]v_{f_{b}} = \frac{-m_{a}v_{f_{a}}}{m_{b}} = \frac{-45 kg*3.5 m/s}{60 kg} = -2.63 m/s[/tex]
The minus sign is because the 60 kg skater is moving in the opposite direction from the other skater.
Therefore, the 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.
I hope it helps you!
role play pokimon only
Answer:
huh
Explanation:
im so confused
Answer:
eevee
Explanation:
A girl walks 0.3 m/s. She moves 0.8 m/s 5 s later.
What is the girl’s acceleration?
0.8 m/s
0.5 m/s, 2
0.3 m/s
0.1 m/s2
Answer:
a = 0.1 [m/s²]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t[/tex]
Vf = final velocity = 0.8 [m/s]
Vo = initial velocity = 0.3 [m/s]
a = acceleration [m/s²]
t = time = 5 [s]
[tex]0.8=0.3+a*t\\0.5 = 5*a\\a = 0.1 [m/s^{2}][/tex]
2. State law of conservation of
momentum and apply conservation of
momentum in elastic collision of two
objects.
Answer:
In collisions between two isolated objects Newton's third law implies that momentum is always conserved. In collisions between two isolated objects momentum is always conserved. Kinetic energy is only conserved in elastic collisions.
Explanation:
A sled is pushed to right with a force of 200 N. The force of friction opposing that motion is 50 N. a) What is the Net Force on the sled? b) assuming the mass of the sled is 30 kg, use Newton's 2nd Law equation to determine the acceleration. Include units in BOTH of your answers! *
Answer:
Fr = 150 [N]
a = 5 [m/s²]
Explanation:
In order to find the resulting force, we must assume that the thrust force is positive to the right, while the friction force is negative to the left.
[tex]F_{r}=200-50\\F_{r}=150[N][/tex]
Now Newton's Second Law tells us that the sum of the forces or the resulting force is equal to the product of mass by acceleration.
F = m*a
[tex]150 = 30*a\\a=150/30\\a = 5 [m/s^{2} ][/tex]
No one falls out during a loop on a
rollercoaster because of _____.
Answer:
Seatbelts
Explanation:
Resistance to change in motion. it presses tour body outside of the loop, keeping you inside the cart
Which statement best describes the overall function of the human respiratory system? A. The heart pumps blood containing carbon dioxide into the lungs, where it is absorbed. B. Oxygen is transferred into the blood, which circulates the gas throughout the body. C. Oxygen is taken into the lungs and exchanged for carbon dioxide, which is exhaled. D. Carbon dioxide is taken into the lungs and exchanged for oxygen, which is absorbed.
Answer:
C
Explanation:
During respiration, oxygen diffuses into the lung (carbon dioxide diffuses out), gets into the blood, and is transported around the body. The hemoglobin of the blood distributes the oxygen to the various cells and carbon dioxide from these cells diffuses into the blood. The blood travels back to the lung where the carbon dioxide is exchanged for oxygen once again. The carbon dioxide is eventually exhaled out of the nose.
The correct option is C.
Which option is a compound?
A. Oxygen
B. Carbon
C. Carbon dioxide
D. Air
Answer: Carbon Dioxide.
Explanation: Oxygen and Carbon are both elements, so they can’t be compounds. Air is a mixture of gasses, not a compound.
how is this please help me
Answer:
jsjsjsjsmkskskskksksks
Dont decorate a tree in front of a cat lol we finished decorating the tree last night and the cat climbed up the tree and knocked it over XD
a car initially traveling at 5 m/s accelerates for 2 seconds at 3 m/s. how far does it travel during this time?
Answer:
x = 16 [m]
Explanation:
This problem can be solved using the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = 5 [m/s]
a = acceleration = 3 [m/s²]
t = time = 2 [s]
[tex]v_{f}=5+3*(2)\\v_{f}=11[m/s][/tex]
Now we can find the displacement using the following equation of kinematics.
[tex]v_{f}^{2} =v_{o}^{2} +2*a*x\\11^{2}=5^{2} +2*3*x\\96=6*x\\x=16[m][/tex]
A car accelerates at a rate of 2.0 m/s2. If its original speed is 8.0 m/s, how many seconds will it take the car to reach a final speed of 28.0 m/s?
Answer:
[tex]\huge\boxed{\sf Time = 10 \ seconds}[/tex]
Explanation:
Given:
Initial Velocity = [tex]\sf V_{i}[/tex] = 8.0 m/s
Final Speed = [tex]\sf V_{f}[/tex] = 28.0 m/s
Acceleration = a = ?
Required:
Time = t = ?
Formula:
[tex]\sf a = \frac{V_{f} - V_{i}}{t}[/tex]
Solution:
[tex]\sf 2 = \frac{28-8}{t} \\\\2 = \frac{20}{t} \\\\t = \frac{20}{2} \\\\t = 10 \ seconds\\\\\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807