Answer:
1) 1.30g2) 3 sf3) 5.66 gramsExplanation:
1) Significant figure means the amount of figure we are interested in. Note that 0 is insignificant. For example 30 is a one significant figure i. e the only figure of interest is 3.
Given the figure 1.296 g, as we can see, there are initially for figures in the value. This means we are to eliminate one to make it 3. To do that we will remove the 6 at the back by round it up to 1 and add it to the value of 29 preceding it to give 30. The figure will become 1.30 (to 3sf).
Note that only values greater than 4 are rounded up to 1 and added to the preceding value
2) Given the figure 2020, the number of significant figures present is 3 significant figure. Note that all zeros at the end of a value are considered insignificant hence the only significant value here is 202 (which is 3 sig fig.)
3) For the figure 5.658, the value to 3sf is 5.66 (Note that the value of 8 at the end is rounded up to 1 and added to 65 to make it 66). This is as explained in the first answer above.
When is elastic potential energy stored and when is it released in: a toy glider launcher the elastic cords or springs beneath a sun-lounger a diving board?
Answer:
Explanation:
Assuming a toy glider works on a spring potential energy is stored when the spring(launcher) is fully compressed..and is released when the spring is released.
Potential Energy is stored when the diver has stepped on the board, and the board is at the bottom of its movement, and is released when the diver jumps off.
What happens when a car that weighs 300 lbs. driving at speeds of 80 mph collides with a bystander that weighs 180 lbs.
Answer:
Basically, at these speeds, the car will, at random times, swerve a bit to one side or the other as if hit by some huge wind (even on the calmest of days). It doesn't happen at slower speeds driving mechanically identical cars, managed to accelerate to a formidable 150 mph and stay there for most of the journey, shifting to higher gears and remaining.
Hope this helped you!
Explanation:
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.
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?
Answer:
a = 0.2 m/s²
i sent u explanation before ...
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.
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
differences between work against friction and work against gravity.
Friction is the force that is resisting the motion of an object so it will always point in the opposite direction of that of movement. ... The force of gravity points downwards . So when you do work against gravity it means that the force acting on that object points in the upward direction .
Explanation:
hope this would be the right answer HOPE THIS HELPS YOU.......what does the process skill measuring mean?
Answer:
Process Skills: Observing - using your senses to gather information about an object or event. It is description of what was actually perceived. using standard measures or estimations to describe specific dimensions of an object or event
Explanation:
i hope this isnt confusing
why is gravity only on earth?
Answer:
Gravity is not just found in earth. It is an attractions which can occur in any objects in the universe.The difference is just on less and more gravity.
How fast is a car going in m/5 if speedometer reads 45 miles?
Answer:
i think you would have to divide to 2 numbers to get the sum
Explanation:
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:
what aspect of the gas planets has the biggest effect on their rings and satilites.
Answer:
Explanation:gravity
.
Answer:
Gravity
Explanation:
Gravuty aspect of the gas giants has the biggest effect on their rings and satellites.
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
the temperature of two bodies differ by 1°c. how much will they differ in Fahrenheit?
Answer:
the answer is 1.8°f...
Answer:
33.8 degrees.
Explanation:
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
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
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.
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.
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
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/s²A ball is thrown straight up with an initial velocity of 6.4 m/s. It travels for 0.64 seconds, and has a change of position of 2.05 meters. What is the ball’s final velocity?
Answer:
V = 0.9 m/s
Explanation:
The parameters given are:
Initial velocity U = 6.4 m/s
Time t = 0.64s
Height h = 2.05 m
To find the final velocity, let us use third equation of motion
V^2 = U^2 - 2gH
Since the ball is going upward, g will be negative
Substitute all the parameters into the formula
V^2 = 6.4^2 - 2 × 9.8 × 2.05
V^2 = 40.96 - 40.18
V^2 = 0.78
V = sqrt( 0.78)
V = 0.883 m/ s
V = 0.9 m/ s approximately
PLZ HELP ME 50 POINTS AND BRAINLEIST TO FIRST PERSON Give an example of the strong surface tension exhibited by water
Answer:
Water striders have strong intermolecular forces on their legs which enables them to run on water.
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].
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.
a) A student performs an experiment and plots the V-I graph of series and parallel combination
of two resistors. Which graph represents series combination of resistors? Justify your answer.
b) Define joules law of heating
c) 100 J of heat are produced each second in a 42 resistance. Find the potential difference
across the resistor.
Answer:
b) Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.
Explanation:
c) P= v2÷R
PR=V×V= 100×42=4200
v=sqroot 4200= 64.8volts
In 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
The driver of a car traveling at a speed of 27 m/s slams on the brakes and comes to a stop in 3 s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 3 s interval
Answer:
Average speed = 13.5 m/s
Explanation:
Since the car is running at a speed of 27 m/s and it stops after 3 seconds by applying the brake. Therefore, the initial speed of the 27 m/s and final speed is 0.
Use below formula to find the average speed :
Average speed = (Initial speed + final speed ) / 2
Average speed = (27 + 0 ) / 2
Average speed = 13.5 m/s
Starting at point 0, you travel 500 m on a straight road that slopes upward at a constant angle of 5 degrees. What is your height above the starting point? Answer in meters to the nearest centimeter
Answer:
43.58 m
Explanation:
If you travel 500 m on a straight road that slopes upward at a constant angle of 5 degrees
Using trigonometry ratio
Sin 5 = opposite/hypothenus
Where the hypothenus = 500m
Opposite = height h
Sin 5 = h/500
Cross multiply
500 × sin 5 = h
h = 500 × 0.08715
h = 43.58m
Therefore, the height above the starting point is equal to 43.58m
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
How does the hypothesis help inform the design of an experiment
Answer: Hypotheses, which are proposed explanations for scientific observations, help us properly design experiments because experiments are used to test those hypotheses. Experiments are designed based on the measurable variables defined in a given hypothesis.
Explanation: Make a list of all potential hypotheses to be tested. For each hypothesis, ask what would be true if the hypothesis were true. The experimental procedure is a step-by-step recipe for the science experiment. A good procedure contains enough detail that someone else could easily duplicate the experiment.
Hope this helps^^