Answer:
What shape is it? the formula is different depending on the shaping
Explanation:
Square P=4s
Rectangle P=2L+2W
Triangle a+b+c
Circle P=C=2πr=πd
and so on
what do understand by the efficiency of a machine? By using a block and tackel a man can raise a load of 720 N by an effort of 180 N.Find the mechanical advantage of the method.
Answer:
Efficiency of a machine is how well the machine works and what the machine is capable of doing.
Mechanical advantage=Load/Effort.
720/180=4
328,000 mm + 137 m = ______________m?
Answer:
465m.
Explanation:
Convert all units to meters. So,
328 + 137 = 465m.
What is a tomato
Fruit
Root
Stem
None of these
why do we accelerate forward when we run?
It depends on what direction you are running in, if it's forward, you'll have to keep to accelerating forward to keep running.
If you stop accelerating forward, you wouldn't be able to move forward.
A student leaves a sidewalk corner walks 3.0 blocks north then walks 3.0 blocks west.what is the students displacement from the starting position
Answer:
The students displacement is 3·√3 blocks, 45° North of West
Explanation:
From the question, we have;
The distance North in which the student walks = 3.0 blocks
The next walking distance West by the student = 3.0 blocks
The displacement of the student = The shortest distance between the student start and final point
By representing the motion of the student in vector format, we have;
[tex]\mathbf{d} = 3\cdot \hat{i} + 3\cdot \hat{{j}}[/tex]
Therefore the magnitude of d is given as follows;
[tex]\left | d\right | = \sqrt{3^2 + 3^2} = 3\cdot \sqrt{3} \ blocks[/tex]
The direction of the student = tan⁻¹(3/3) = 45° West of North
The students displacement = 3·√3 blocks, 45° North of West.
Bella makes the 6.1m distance to her food bowl in 8.8 seconds what is her average velocity
How might error analysis help scientists identify and quantify the
causes and effects of uncertainties in measured data? Why is it
important to perform multiple trials in an experiment?
Answer: For producing the error free results of an experiment that identification and quantification of effects of uncertainties are important.
Explanation:
The error analysis is necessary to detect the uncertainties in the measured data or results of the experiment to ensure the validity and acceptability of the results. The errors can be avoided by increasing the precision and accuracy of the measuring instruments. The other factors like changes in the variables of the experiment can also contribute to the errors in the experiment.
It is necessary to perform the multiple trails in an experiment to assure that the results of the experiment are consistent with every trial.
the diagram shows a ray of light being reflected by a plane mirror and one angle is 60 degrees.what will be the measure of its angle of incidence and angle of reflection?
Answer:
when the light is reflected from a surface the angles of incident is always equal to the angles of reflected where both angles are measures from the path of the light to the normal to the surface at the point at which light stricks the surface . this equality is known as the law of reflection .
Since the angle of reflection is 60 degrees, the angle of incidence is also 60 degrees.
What are the laws of reflection?The laws of reflection describe the behavior of light when it is reflected off a smooth surface, such as a plane mirror. There are two laws of reflection:
1. The angle of incidence is equal to the angle of reflection: When a light ray strikes a surface, the angle between the incoming ray and the surface (the angle of incidence) is equal to the angle between the reflected ray and the surface (the angle of reflection). This law holds true for all angles of incidence.
2. The incident ray, the reflected ray, and the normal to the surface all lie in the same plane: The normal is an imaginary line perpendicular to the surface at the point where the ray strikes the surface. The incident ray is the incoming ray of light, and the reflected ray is the ray that bounces off the surface. Both of these rays, along with the normal, all lie in the same plane.
These laws can be used to predict the path of reflected light and to determine the position and size of an image formed by a plane mirror. The angle of incidence and angle of reflection can be measured using a protractor, and the normal can be found by drawing a line perpendicular to the surface at the point of incidence.
Here in the Question,
According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), which means:
i = r
The angle of incidence = Angle of reflection = 60 degrees.
Therefore, The angle of incidence is also 60 degrees since the angle of reflection is 60 degrees.
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Why does the first raindrop decide to drop down to the field?
Answer:
good question lol
Explanation:
The raindrop wants to help in any way it can. The raindrop believes it can water the field by itself.
Answer:
The first raindrop decided to drop down to the field to cheer up the farmer a little bit.
There are other equally good substitutes for exercise. True False
Answer:
B is the answer to this question
Answer:
True
Explanation:
For Example
Walking is a form of exercising without realising it
when you think you are creating blood flow which is oxygen which generates energy with that being said could be considered exercising no matter what you do in a result of energy in the body you are exercising.
What is the volume of a box that is 3 m long, 0.5 m high, and 2 m wide?
An atom with the expected number of neutrons, protons, and electrons is called a(n)
Answer:
Stable atom
Explanation:
A stable atom is one that has a balanced nuclear inter-particle force reaction as such the binding energy of a stable atom is sufficient to permanently keep the nucleus as one unit. Examples of a stable atom are the atoms of monoisotopic elements such as fluorine, sodium, iodine, gold, aluminium, and cobalt.
In a stable atom the expected number of proton, neutron, and electron are present while in an unstable atom or radioactive atom, there are more than the expected number of neutrons or protons, such that the internal energy of the nucleus is excessive and more than the binding energy, which can lead to radioactive decay.
The major changes in the state of the universe that occurred immediately after the Big Bang were in ______ and ______.
a dog walks 12 meters to the west and then 16 meters back to the east
Answer:
Explanation:
4 meters east
Which equation can be used to solve for acceleration?
Answer:
The answer's A
Explanation:
Have a good day! :)
Option A is correct. the equation that can be used to solve the acceleration is expressed as [tex]t = \frac{\triangle V}{a}[/tex]
Acceleration is defined as the change in velocity of a body with respect to time. Mathematically;
[tex]a=\frac{\triangle V}{t}[/tex] where:
[tex]\triangle V[/tex] is the change in velocityt is the time takenMaking the time "t" the subject of the formula:
[tex]t = \frac{\triangle V}{a}[/tex]
Hence the equation that can be used to solve the acceleration is expressed as [tex]t = \frac{\triangle V}{a}[/tex]
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How many seconds will it take for a satellite to travel 550 km at a rate of 130 m/s?
Answer:
4230.77s
Explanation:
We know: t=D/S, 550 km =550,000 m, so you can get the time by dividing 130 from 550000, you can get: 550000/130 approximately equals to 4230.77s. :) If I am correct, Mark the Brainlist, plz :D
It would take 4230.7692 seconds for a satellite to travel 550 km at a rate of 130 m/s
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
The mathematical expression for velocity is given by
velocity= total displacement/Total time
As satellite has to travel 550 km
1Km =1000 m
550 km = 550000 m
Time is taken by satellite to travel 550000 m by velocity rate of 130 m/s
Time = displacement/velocity
=550000/130 seconds
=4230.7692 seconds
Thus, the satellite will take 4230.7692 seconds
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What is the mass of a car that has a kinetic energy if 4,320,000 J moving at 23 m/s?
Answer:
kinetic energy=1/2mv^2.
which is 4320000=1/2×m×23^2.
which is 4320000=1/2×m×529.
4320000=264.5m.
m=4320000/264.5.
m=16332.70~16333g
The mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s would be 16332.70 Kg
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
Total mechanical energy is s the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
As given in the problem we have to calculate the mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s
K.E = 4,320,000 J
v = 23 m/s
The total kinetic energy
KE = 1/2mv²
By substituting the respective values in the formula of kinetic energy
4,320,000 J =1/2m23²
m = 4,320,000×2/23²
m = 16332.70 Kg
Thus, The mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s would be 16332.70 Kg
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The microwave oven was invented in 1945 when some experiments with radar equipment failed and melted some nearby chocolate instead. The scientists realized there were other applications for this energy source. What is an example of.
Answer: Creative Thinking.
Explanation: Creative thinking this is a special ability possessed by individuals to see things differently or I’m a different dimension, and find new ways of solving problems. The fact it’s Creative thinking skills doesnt mean it’s for only 'creative types' like musicians. Everyone can also be a beneficiary of creative thinking from time to time. Just like in the case of the scientist above who saw an invention from his failed experiment.
Answer:
good thinking
Explanation:
gave the person above me brainy
A ball is shot into the air with initial speed of 40 m/s. How high will the ball go before falling back down?
A. 20m
B. 40m
C. 60m
D. 80m
Answer:
B. 40m
Explanation:
If you were to measure your pulse rate while in a spaceship moving away from the Sun at a speed close to the speed of light, you would find that it was
Answer:
Your pulse rate will be the same as it was while you were on Earth.
Explanation:
Since you are on the ship, and you have the same speed with the ship, then, you'll observe your heart rate to be the same as your heart rate while you were on Earth. This is because there is no relative speed between you and the ship, since you're both on the same frame of reference.
Calculate velocity of a plane flying 1800 miles North East in 4.5 hours
Answer:
400
Explanation:
We divide time (4.5 hours) and speed (1800 miles)
1800÷45=400
A jet engine pushes air at high velocity toward the rear of the plane. Thrust is created moving the plane forward. Which statement is correct about the amount of force the air pushes the engine forward with?
The air pushes the engine with an equal force in the opposite direction. The air pushes the engine with a much smaller force in the same direction.
The air pushes the engine with an equal force in the same direction. The air pushes the engine with a much smaller force in the opposite direction.
A water strider bug is supported on the surface of a pond by surface tension acting along the interface between the water and the bug’s legs. Assume the bug weighs 10−4 N and the surface tension force acts vertically upward. Determine the minimum length of the interface needed to support the bug
Answer:
minimum interface length = 1.36 mm
Explanation:
given data
weight of the bug = [tex]10^{-4}[/tex] N
solution
we will apply here Surface Tension formula that is
Surface Tension ,σ = Force ÷ length ........................1
and we consider here surface tension for water is 7.34 × [tex]10^{-2}[/tex] N/m
so that here minimum interface length needed to support the bug is
minimum interface length = Force ÷ σ
minimum interface length = [tex]10^{-4}[/tex] ÷ 7.34 × [tex]10^{-2}[/tex]
minimum interface length = 1.36 mm
i need help with this one 2 if you guys don’t mind
It appears as though your vehicle is about to be hit on the right side (a broadside collision). What should you do to reduce damages from the collision?
Answer:
Turn the vehicle to the left, in order to reduce the momentum on the car during sackcloth
Explanation:
In the case of a collision on the right side, two things can be done to reduce the damage caused.
* Turn the vehicle to the left, in order to reduce the momentum on the car during sackcloth
* Decrease the speed, to have a less change in the amount of movement.
difference between fundamental unit and derived unit (any two)
grade 8 question
Answer:
fundamental units are those units that are independent to other units where as derived units are derived from fundamental units . there are altogether 7 fundamental units where as there are more than seven derived units..
Answer:
[tex] \boxed{ \sf{see \: below}}[/tex]
Explanation:
[tex]\underline{ \sf{fundamental \: unit}}[/tex]
[tex] \star[/tex] This is the unit of a fundamental quantity.
[tex] \star[/tex] This unit is independent of other units.
[tex] \star[/tex] There are only seven fundamental units. They are metre , kilogram , second , Kelvin , ampere , candela and mole.
[tex] \underline{ \sf{derived \: unit}}[/tex]
[tex] \star[/tex] This is the unit of a derived Quantity.
[tex] \star[/tex] This unit is obtained from fundamental units.
[tex] \star[/tex] It is formed in many types using seven fundamental units. They are Newton , Pascal , Joule , Watt , Hertz , Ohm etc.
Hope I helped!
Best regards! :D
calculate the pressure of water in a well if the depth of water is 10m
p=d×h×g
p=1000×10×10
:.:p=100000 pa
Explanation:
p=Liquid pressure
d=Density
h=Height
g=acceleration due to gravity
T H A N K Y O U ! !
30. A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD?
Answer:84 generations
Explanation:
A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD? Approximately 84 generation.
If a car travels 23.8 meters in 4.2 seconds, what is its speed?
Put your units in the form of a correct abbreviation (example, write s for seconds, m
for meters, or m/s for meters per second).
I need the ans for this question QUICK PLEASE!!!
Explanation:
A) 1.05
B) 1.33
C) 1.16
D) 0.62
All units in cm