which of the following is the longest distance A 5000 centimeters B 30 000 millimeters C 500 meters D 0.400 kilometers
Answer:
C
Explanation:
first we convert km,m,cm into mm then compare them
The longest distance is 0.400 Km among all the given distances. Therefore, option (D) is correct.
What are SI units of metric length?The metric system can be defined as a system that is used for the measurement that uses the liter, meter, and gram as base units of length, capacity, and weight respectively.
In the metric system, the SI unit of length is represented as a meter which can be defined as the metric length that is traveled by light in a vacuum within 1⁄29979258 seconds.
Some of the other units of distance include Kilometres, Millimetres, nanometers, Centimetres, Meters, and Decimeters.
Conver all the given distance into meters:
A) 5000 cm = 5000 × 10⁻² m = 50 m
B) 30000 mm = 30000 × 10⁻³ m = 30 m
C) 500 m = 500 × 1 = 500 m
D) 0.400 Km = 0.4 × 10³ = 400 m
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2.
Explain why holes are made in hanging banners and
hoardings.
Answer:
holes are made in hanging banners and hoardings to allow air to pass them as result of which there will be less pressure of air on the banners and hoardings .Unless it is done ,these may be uprooted or distorted due to the pressure of the the air
What change should be expected in the velocity of a body to maintain the same
kinetic energy, if its mass is increased sixteen times? How?
Answer:
firstly,
ke=1÷2mv^2
on putting same ke by increasing mass by 16 times new velocity becomes v'
then
ke=1÷2×16m×v'^2
from above we can write
1÷2mv^2=1÷2×16m×v'^2
v^2=16v'^2
1÷4v=v'
hence original velocity should be decreased by 4 times to keep same ke
A rigid tank contains 10 kg of an ideal gas at a pressure of 5 atm and a temperature of 30 oC. By opening a valve half of the mass of the gas is allowed to escape. In the final pressure in the tank is 1.8 atm, the final temperature in the tank, in oC, is
Answer:
T₂ = 218.16 k = -54.84°C
Explanation:
Consider, the general gas equation:
PV = nRT
where,
P = Pressure of Gas
V = Volume of Gas
n = No. of Moles of Gas = mass in gram/Molecular Mass = m/M
R = Gas Constant
T = Temperature of Gas
Now,
PV = mRT/M
P/mT = RM/V
since, RM/V = Constant values in both final and initial states.
therefore,
P₁/m₁T₁ = P₂/m₂T₂
T₂ = P₂m₁T₁/m₂P₁
where,
T₂ = Final Temperature = ?
P₂ = Final Pressure = 1.8 atm
m₁ = Initial Mass = 10 kg
P₁ = Initial Pressure = 5 atm
m₂ = Final Mass = 10 kg/2 = 5 kg
T₁ = Initial Temperature = 30°C + 273 = 303 k
Therefore,
T₂ = (1.8 atm)(10 kg)(303 k)/(5 kg)(5 atm)
T₂ = 218.16 k = -54.84°C
why it is important to convert units prior to calculation?
It's not. What it is, often, is easier.
You should know by now that you need to be working with a consistent set of units. This means that your unit for velocity is your unit for length divided by your unit for time…and your unit for acceleration is your unit for velocity divided by your unit for time…and your unit for force is your unit for acceleration multiplied by your unit for mass…and your unit for energy is your unit for force multiplied by your unit for length…and your unit for power is your unit for energy divided by your unit for time…and so on.
In this way, your calculations will automatically yield answers in the correct units.
SI makes things very easy because of everything being consistent and base 10 with the metric prefixes. It also was standardized nicely from the start. It also is based upon a number of important physical constants…so, for example, water at room temperature is about 1g/cc and it has a a specific heat of 1 calorie per gram and 100 degrees between freezing and boiling.
These days, all other systems of measurement are based on SI units, anyway, so you'll be hard pressed to find a better and easier system to work with.
What is the difference between velocity and vector
Answer:
vector is a physical quantity while velocity is a vector physical quantity
Which term best describes how fast and in what direction an object is moving at a particular moment? Question 2 options: acceleration average velocity position instantaneous velocity
Answer:
Instantaneous velocity
Explanation:
Acceleration = rate of change of velocity
Average velocity = total displacement divided by total time taken
Position = It shows the location of the object
Instantaneous velocity = It is the velocity of an object at a particular instant.
The term that describes how fast and in what direction an object is moving at a particular moment is "instantaneous velocity". It is basically equal to the derivative of position wrt time.
which one of the following is radical?
a.NH4+
b.CUSO4
c.CH4
d.NH3
Answer:
The unit that is a radical among the options is;
a. NH₄⁺
Explanation:
A radical is an atom, group of atoms molecule or ion that contains an electron that is unpaired. The presence of the unpaired electrons make radical very reactive as such most radicals enter into reactions with other species or with themselves to form new compounds making them not last long.
Radicals are also known as free radicals. Examples of radicals includes; Ammonium ion, NH₄⁺
Nitrate ion NO₃⁻ (From a salt)
Hydroxide ion OH⁻ (From a base)
Sulphate ion SO₄²⁺ (From an acid)
All of which are formed in aqueous solution of acids, salts and bases.
Which action might lead scientists to develop new explanations about the
universe?
A. Hoping that new technologies will help them discover more about
life's origins
B. Designing experiments to replicate the conditions in which life
may have first evolved on Earth
C. Speculating on the conditions that must have existed before life
evolved on Earth
D. Making guesses as to how species have evolved over time
Answer:
The correct option is;
B. Designing experiments to replicate the conditions in which life may have first evolved on Earth
Explanation:
The proof to the hypothesis that life originated from inanimate inorganic, or non-living molecules which is an explanation for the origin of life on Earth was provided by an experiment designed and performed in 1953 by Stanley L. Miller and Harold C. Urey which consisted of using chemicals proposed in the hypothesis and combining them through a specific design process to replicate expected atmospheric condition before the life began on Earth.
With such successful design of experiments to replicate the conditions in which life may have first evolved on Earth, it was possible to better explain the hypothesis that life originated from inorganic molecule.
How many kilohertz are
750 megahertz?
750 megahertz is equal to 750,000 kilohertz.
Frequency is a fundamental property of waves and is used to measure the number of cycles or oscillations that occur in a given time period. The standard unit of frequency is the hertz (Hz), which represents one cycle per second. However, when dealing with larger frequencies, such as those encountered in electronics and telecommunications, it is common to use metric prefixes to express them more conveniently.
Kilohertz (kHz) represents 1,000 hertz, megahertz (MHz) represents 1,000,000 hertz, and gigahertz (GHz) represents 1,000,000,000 hertz. These prefixes allow us to express frequencies in a more manageable and concise way.
To convert megahertz (MHz) to kilohertz (kHz), you need to multiply the value by 1,000.
Given that 750 megahertz is the value to convert:
750 megahertz = 750,000 kilohertz
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A car starts from rest a stoplight and is traveling with a velocity of 10 m/s east in 20 seconds. What is the acceleration of the car?
[tex]a = \frac{v - v 0}{t} [/tex]
[tex]a = \frac{10 - 0}{20} [/tex]
[tex]a = \frac{10}{20} = \frac{1}{5} = 0.2[/tex]
a = 0.2 m/s²In at least 150 words, describe at least three things that occur naturally everyday and how science has had an impact on what we think or do about them.
Answer:
Explanation:
The three things that occur naturally everyday and how science has had an impact on what we think or do about them is
Photosynthesis is a process in which green plants manufacture there own food in the presence of sunlight through the equation below
6CO₂ + 6H₂O ⇒ C₆H₁₂O₆ + 6O₂
From the equation above, it can be seen that aside from the food (C₆H₁₂O₆) produced by green plants during photosynthesis, science has assisted us in knowing that these green plants take-up the carbon dioxide (CO₂) that is exhaled by humans and release the oxygen (O₂) that is inhaled by humans thereby purifying the air of the surrounding they are found. This concept has made man understand the importance of planting in residential areas.
Depletion of the Ozone layer; the ozone layer is a layer in the earth stratosphere which shields the earth from direct sunlight/rays. Over the years, the burning of hydrocarbon on earth has caused the depletion of this layer thereby exposing the earth to more direct sunlight from the sun. Science has had an impact in the thinking of man in this regard by making us more conscious of the risk of burning these hydrocarbons which has led to the collective efforts by governments across the world to minimize the burning of these substances.
Rain; rain are droplets of water that fall from the atmosphere. Rain formation occurs when water (in the form of ocean, river and/or seas) are evaporated into the atmosphere as a result of heat from the sun. These evaporated water molecule rises and cools down to form and form a cloud It is then returned to earth in the form of rain. This explanation changes the mythical understanding of rain in different culture
if a neutral atom has an atomic number of 18,how many protons does it have in the nucleus
Answer:
18
Explanation:
atomic number = number of protons
12.
A stone is dropped from the top of tower of height h. After 1
second another stone is dropped from the balcony 20 m belowthe top. Both reach the bottom simultaneously. What is the value
of h? (Take g = 10 ms-2)
a)3125 m
b) 312.5 m
c) 31.25 m
d) 25.31 m
Answer:
31.25 is the correct answer
Facing an imminent frontal collision, you want to reduce the force of impact to minimize damage and injuries. How can you reduce the force of impact?
Answer
The driver should reduce the speed or velocity of vehicle
because momentum which is
Mass x velocity will be reduced if velocity reduces and reduce force if impact
The word
means big enough to be seen with the eye.
macroscopic
organic
artificial
microscopic
Answer:
Macroscopic
Explanation:
Visible to the human eye. Does not need any form of magnification.
What do solar cells convert into electricity?
wind
SERE
water
sunlight
plants
Answer:
C.
Explanation:
sunlight
The mass of a planet is 8.03*10^26 kg and it is located at a distance of 6*10^14 m from the earth. Calculate the force of gravitation between them. show full calculation
Answer:
[tex]F=8.88\times 10^{11}\ N[/tex]
Explanation:
Given that,
Mass of a planet is [tex]8.03\times 10^{26}\ kg[/tex] and it is located at a distance of [tex]6\times 10^{14}\ m[/tex] from the Earth.
The mass of Earth is [tex]5.972\times 10^{24}\ kg[/tex]
We need to find the force of gravitation between Earth and the planet. It is given by :
[tex]F=G\dfrac{m_1m_2}{d^2}\\\\F=6.67\times 10^{-11}\times \dfrac{8.03\times 10^{26}\times 5.972\times 10^{24}}{(6\times 10^{14})^2}\\\\F=8.88\times 10^{11}\ N[/tex]
So, the force between them is [tex]8.88\times 10^{11}\ N[/tex].
milligram is larger than a centigram.
Answer:
These measurement units are part of the metric system. Unlike the U.S. customary system of measurement, the metric system is based on 10s. For example, a liter is 10 times larger than a deciliter, and a centigram is 10 times larger than a milligram.
Answer: Unlike the U.S. customary system of measurement, the metric system is based on s. For example, a liter is times larger than a deciliter, and a centigram is times larger than a milligram
In lightning , light is seen first and sound is heard later it is due to
1)optical illusion
2) variation in temperature
3) position of observer
4) difference of velocities of light and sound
Answer:
option 4
Explanation:
Light's velocity in air ( 3 × 10^8 m/s ) is much greater than sound's velocity in air ( 343 m/s )
Hence due to difference in velocities , during lightning light is seen first & sound is heard later
In order to make an object stop, what direction does the unbalanced force need to be applied?
Name four types of friction
Answer:
Static Friction-Friction that acts when the two objects are not moving
Sliding Friction-Two solid surfaces slide across each other
Rolling Friction-An object rolls across each other
Fluid Friction-Friction that occurs as an object moves through a fluid
Explanation:
For each pair of vehicles, choose the vehicle that would experience the greatest force of impact in a collision. Type your answer in the column on the right. Remember, Force = mass x acceleration Vehicle A is moving at 35 mph. Vehicle B is moving at 45 mph. Truck X hits a tree. Truck Y hits a wooden fence. Vehicle Y is carrying five passengers. Vehicle C is carrying only the driver. Motorcycle A runs into a haystack. Motorcycle B runs into a concrete divider.
Answer:
I need help on this tooo
Explanation:
A suspect isnleading the police on a car chase the officer reports that the suspect is traveling north at 100 miles per hour the officer has reported the suspects
Answer:
Velocity.
Explanation:
It is given that, the officer reports that the suspect is traveling north at 100 miles per hour. It means the suspect covers a distance of 100 miles every hour and moving in North direction.
It shows the velocity of the suspect. This is because his speed and direction are given. Velocity is a vector quantity.
So, the officer has reported the suspect's velocity.
if you measure a 5cm line with a ruler that is marked off in 0.1 cms, how many digits should the measurement have?
Answer:
3 digits .
Explanation:
The least count of the ruler that is being used is 0.1 cm , hence it can measure upto one decimal point of cm . One more decimal point can be inferred .
So the measurement of 5 cm will look like
5 .00 cm or it will have 3 significant figure . The last figure of the measurement suffers from error as it has been inferred or guessed.
If the force of gravity increases which measurement will change and how? 1. Weight increases 2. Weight decreases 3. Mass decreases 4. Mass increases
The answer is weight increases
Answer:
Weight increases
Explanation:
The gravitational force increases as the size of an object increases. On the other hand, the strength of gravity is inversely related to the square of the distance between two objects
What is the power in a circuit that has a current of 12 A and a resistance of 100 Ω? (Note: 1 A2·Ω = 1 W) (1 point)
Answer:
[tex] \boxed{\sf Power \ in \ the \ circuit = 14.4 \ kW} [/tex]
Given:
Current (I) = 12 A
Resistance (R) = 100 Ω
To Find:
Power (P) in the circuit
Explanation:
Formula:
[tex] \boxed{ \bold{P = I^2 R}}[/tex]
Substituting value of I & R in the equation:
[tex] \sf \implies P = {(12)}^{2} \times 100 \\ \\ \sf \implies P = 144 \times 100 \\ \\ \sf \implies P = 14400 \: A^2.\Omega \\ \\ \sf \implies P = 14400 \: W \\ \\ \sf \implies P = 14.4 \: kW[/tex]
[tex] \therefore[/tex]
Power (P) in the circuit = 14.4 kW
Physical system
What happens when you drop a book
Why does it fall on the floor
Why doesn't it rise higher in the air
Answer:
this happens because there is gravitational force acting upon it.
Answer:
The book will fall when you drop it and make a thud, It falls on the floor because there is no force holding it up, but there is a force pulling it down, the gravitational force. It doesnt rise higher in the air because It does have lighter like the properties of a balloon.
Explanation:
difference between male and female gamete
Answer:
The male gamete is smaller in comparison to that of the female gamete.
The male gamete is conical from the front while the female gamete is spherical.
The cytoplasm in the male gamete is less in comparison to that of the female gamete.
The male gamete can move with the help of the tail while the female gametes are immobile and do not have any tail or flagella present.
The number of mitochondria present in the sperm is less than the number of mitochondria present in the ovum.
The male gamete has acrosome present in the head region that contains enzymes for dissolving the membranes present around the ovum. The ovum does not contain such digestive enzymes.
Explanation:
Answer:
MALE GAMETES:
1)A male gamete is the male reproductive cell, which unites with the female gamete to produce the zygote.
2)Produced by spermatogenesis.
3)Produced in testes.
4)Smaller than female gametes.
5)Swims using tails.
6)Uses sugar in seminal fluid.
FEMALE GAMETES:
1)A female gamete is the female reproductive cell, which unites with male gamete to form the zygote.
2)Produced by oogenesis.
3)Produced in the ovaries.
4)Larger than male gametes.
5)Does not move by itself.
6)Uses protein and fat in the cytoplasm.
in short
Gametes are an organism's reproductive cells. They are also referred to as sex cells.
Female gametes are called ova or egg cells, and male gametes are called sperm. In contrast, each egg cell, or ovum, is relatively large and non-motile.
hope this helps you friend
Why is the term "scientific methods" more accurate than "scientific method"
Answer:
The term "scientific methods" are more accurate than "scientific method" because "s" used in "scientific methods" makes the word plural and science experiments use several observations to get a result and not only based on single observation.
So, "scientific methods" is a plural term that is more accurate than "scientific method".