Explanation:
molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. The empirical formula represents the simplest whole-integer ratio of atoms in a compound.
Answer:
The symbollic representation of a molecule of an element or a compound present in a molecule is called molecular formula.
For example: molecular formula of sodium chloride is NaCl.
A still object has a mass of 25kg, what would be the Weight? What would be the Normal Force?
[tex]\\ \rm\longmapsto Force=Mass(Acceleration)[/tex]
[tex]\\ \rm\longmapsto Force=25(10)[/tex]
[tex]\\ \rm\longmapsto Force=250N[/tex]
Calculate the electrical energy transferred by a 60W electric bulb that is turned on for 20s and 5minutes.
Answer:
approximately 0.00504 kWh
Explanation:
This electrical energy and is measured in kWh.
For 5 minutes and 20 seconds of use, it is 0.06 W x 0.084 h = 0.00504 kWh.
Note: 60W = 0.06kW; 5min 20sec = 0.083(8) ≈ 0.084 hour
show with the help of an experiment that the acceleration of a freely falling body doesn't depend on the mass of that body. pls answer this question:)
Answer:
Experiment
Materials needed
Stop watch, a small stone, a big stone, a balance.
Procedure
Measure the mass of the two stones.
Hold the two stones about 5m above the ground level.
Drop the stones simultaneously.
Record the time taken for the stones to strike the ground.
Repeat the procedure with different masses of objects at the same height.
Observation, it will be observed that, all the objects dropped from the same height strike the ground at the same time interval.
Conclusion; a falling object doesn't depend on mass
Explanation:
½mv²=mgh
g=½(V²/h)
When an object is held at a height, it posses gravitational potential energy which is mgh, where m= mass, h=height, g=acceleration due gravity
When the object is dropped, the potential energy will be converted to kinetic energy which is ½mv², where V=velocity at which the object moves.
V=∆h/t, ∆h is change in height with respect to time.
½mv²=mgh
Mass cancel out,
g=v²/2h
This implies that g does not depend or is not affected by mass. Hence heavy object and light object will reach the ground at the same time when dropped from the same height. When air resistance is negligible.
Fluorescent lamp of 25W gives more light than the filament lamp of 50W. Why?
Answer:
Fluorescent lamp releases more light energy.
Explanation:
This is so because the fluorescent lamp releases more light energy and less heat energy than that of a filament lamp with the same rating.
Fluorescent lamp releases more light energy than that of filament lamp and also less heat energy than that of a filament lamp.
What is Power of fluorescent lamp and filament lamp?The filament and the fluorescent lamps are two different types of most commonly used light lamps. The filament lamps are the lamps which work on the phenomenon of incandescent whereas a high resistance filament is heated up in the lamp until it radiates visible light energy. Whereas, a fluorescent lamp is the lamp which works by ionizing a gas that emits photons or energy particles.
The fluorescent lamp releases more light energy and less heat energy than that of a typical filament lamp with the less power of 25W than 50W.
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1. What distances can you be certain of on the ruler in Model 1?
Answer:
Zero cm and 10 cm......
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Explain a lever and a pivot in a full sentence
Answer:
The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.
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a sound intensity of 70 dB is observed a distance of d from the source of sound. what sound intensity would be observed at a distance 2d from the source
Answer:
Correct option is
B
16dB
Sound level at A is ⊥o⊥B
If the intensity of sound at A 4 cm away from the source is I
A
then.
⊥o=10log
I
o
I
A
Where I
o
=10
−12
w m
−2
⇒⊥=log
10
−12
I
A
⇒
10
−12
I
A
=10
⇒I
A
=10
−11
wm
−2
If the source (s) is emmitting the sound energy of power P
I
A
=
4×(4)
2
P
⇒P=10
−11
×64π w
⇒ Intensity of sound (I
B
) ar point B,2 m
I
B
=
4π(2)
2
P
I
B
=
16π
64π×10
−11
10 m
−2
⇒I
B
=4×10
−11
wm
−2
⇒ Sound level at 2m=10log(
I
I
B )
=10log(10 −12
4×10 −11)
=10log40
=16.02
Hence Sound level at 2m from sourceis 16 dB
How are the oscillating magnetic and electric fields of an electromagnetic wave positioned relative to each other?
Answer:
Electromagnetic waves consist of both electric and magnetic field waves. These waves oscillate in perpendicular planes with respect to each other, and are in phase. The creation of all electromagnetic waves begins with an oscillating charged particle, which creates oscillating electric and magnetic fields.
Explanation:
Difference between Work against gravity and Work done against friction?
Answer:
if there is not motion produced in body, the works become zero. We can do work against gravity or against friction. when we lift something then it is work done against gravity and when we slide something then it is work done against friction.
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Answer:
1. Limiting Factors.
2. Cardiovascular Fitness.
3. Muscular Fitness.
4. Obese.
5. Flexibility.
6. Physical Fitness.
7. Regular Exercise.
Explanation:
There isn't really an explanation for this but please give brainliest if this helped you!
Answer:
I agree with him even though I don't understand anything
How are the oscillating magnetic and electric fields of an electromagnetic wave positioned relative to each other?
A) They are parallel to each other.
B) The magnetic field is rotated 45° from the electric field
C) the electric field is rotated 45° from the magnetic field.
D) They are perpendicular to each other
Answer:
D.
for the scalar product between two vectors to be 0 either one of thm is zero vector or they are perpendicular to each other
A car has steady speed of 8m/s .How long does the car take to travel 160m
Answer:
the time taken by the car to travel 160 m = 160/8= 20 s
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A student conducts an experiment to determine how the amount of water given to a plant affects its growth.
What is the dependent variable for this experiment?
a. the amount of water
b. the height of the plant
C. the amount of sunlight
d. the amount of soil
Answer:
Option A because the researcher can change the amount of water given to the plant to determine the dependent factor, how much the plant grows. Options C and D are both control variables that need to stay the same in order to perform this experiment correctly.
between the continental shelf and a continental rise?
volcanic island
seamount
continental slope
Answer:
continental slope
Explanation:
the continental shelf is after the land and before the continental rise as it's in the diagram of an ocean floor
A stone of mass 600g is thrown vertically upwards. calculate the value of the gravitational force on the stone at its highest point. take g = 10N/kg
Answer:
6N
Explanation:
F = m × g
= 0.6 × 10
= 6N
to find the force you first have to convert the mass to kg by dividing 600 by 1000 giving you 0.6
then you can multiply the mass times the gravity giving you a gravitational force of 6N
plz hep me tell ans of this only
We have no idea what force the object might exert until it hits something.
In order to accelerate 70 kg at the rate of 20 m/s^2, YOU or some machine has to PUSH it with a force of (F=m•a) 1,400 Newtons. If you stop pushing it, it stops accelerating.
Ice has a density of 0.92 g/cm°; gasoline has a density of 0.68 g/cms. Will ice float in gasoline? Why or why
not?
Answer:
No,ice will not float
Explanation:
A substance sinks in another if it has a greater density than the other substance. The density of ice is clearly greater here and so ice will sink
Colulate the wavelength of i)a ball moving of 40m/s i i)A proton moving at 40 ms i i i) An election moving at 40m/s
Explanation:
[tex]thank \: you[/tex]
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was ten years ago.
Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?
(A) A few children still use traditional wooden sleds.
(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
(E) Because the traditional wooden sled can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
Answer:
(E) it seems like the best option
SCIENCE
A student wants to try to convince her parents to stop serving peas for dinner. She lays out her argument that peas are high in fructose, which is a type of sugar. Which test could she use to provide scientific evidence to support her argument that peas are high in fructose?(1 point)
brown paper bag test
vinegar test
Benedict’s test
iodine test
Answer:Benedict’s Test
Explanation:
The student will use Benedict's test to support her argument.
The common reagents for testing carbohydrates are iodine and Benedicts test.
While iodine gives a positive result with starch, it doesn't react with fructose.
Benedict's reagent is used to determine the presence of reducing sugar in a given solution.
A positive test with Benedict's reagent is determined by a color change from clear blue to brick-red with a precipitate.
A reaction between fructose and Benedict's solution gives a positive test from the color change which occurs when the fructose is reduced to simple sugar such as glucose and mannose.
Thus, the student will use Benedict's test to support her argument.
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Lilly drove her car east for a total of 6 hours at a constant velocity. In one-third of that time, she drove 160 kilometers. What was her velocity?
Write your answer as a whole number.
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Answer: 160 km
Explanation:
NEED HELP ASAP What are the lengths of the x and y components of this vector?
Explanation:
the lengths of the x and y components of the vector :
the x- Component:
Vx = 12×cos72° = 12× 0.3090 = 3.708
the y-component:
Vy = 12×sin72° = 12× 0.9510 = 11.412
-
x-component
= 12 . cos 72
= 12 . 0,3090
= 3,708
y component
= 12 . sin 75
= 12 . 0,9510
= 11,412
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A car accelerates by 4 m/s^2 and travels for 2.5 mins with an initial velocity of 20m/s. Find the final velocity.
Answer:
540m/s
Explanation:
v= u + at
u change t to seconds
what is a risky behaviour
Explanation:
Doing homework is risky behaviour broo
need help asap!! thank you in advance, will mark brainliest!!
Answer:
Wanna be my friend?
Explanation:
maize is called monocot why?
Answer:
Rice, wheat, maize all have one cotyledon in their seed, so they are monocots. Explanation: The monocot plants have a single cotyledon. They have a fibrous root system, leaves in monocots have parallel venation.
Explanation:
Who has the greater velocity, an astronaut who has just completed an orbit of the Earth or you when you have just traveled from home to school? Explain.
Answer:
the answer is
Explanation:
constant acceleration
because when the object's velocity is changing then the object is accelerating or decelerating
as acceleration describe changing of velocity so the answer is constant acceleration
Acceleration is defined as the rate of change of velocity.
Acceleration = (Change in velocity) / time taken
Acceleration = (Final velocity - initial velocity) / time
As the object velocity changes by the same amount in each second, it means the acceleration is constant.
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the power of a bulb is 100 watt .what does it mean
Answer:
Explanation: 100 watts is a unit of power.
A watt is also the amount of energy being consumed. So the more watts the brighter the light bulb is lit.
What is concentration gradient?
Answer:
The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be 'down' or 'with' the concentration gradient.
Explanation:
Is energy conserved during a fission/fusion reaction?
Answer:
No,but it can be changed into other forms.