Answer:
How many decimal places did you use when you measured the mass of each square of aluminum? Which places were exact, and which were estimated? Three decimal places were used.Explanation:
What is the conversation of energy
Answer:
The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.
Explanation:
Answer:
a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.
What is the net force on the object represented by the FBD below?
Explanation:
hope you understood fella
Help me plssssss !! :)))))
Answer:
Explanation:
Electric force is an invisible force created by electrically charged objects. The area of this force around electrically charged objects is called electric field.
The answer is B.
Answer:
Explanation:
by def'n, ans is B. Electric, electric
A lightbulb has an efficiency of 13.1%.How much light energy (not heat energy) is generated by the bulb every second if the bulb has a power pf 8W?
Answer:
1.048 W
Explanation: Given that a lightbulb has an efficiency of 13.1%.How much light energy (not heat energy) is generated by the bulb every second if the bulb has a power pf 8W?
The input power = 8W
The output power = ?
The efficiency = 13.1%
Using the formula below:
Efficiency = (power output / power input) × 100
13.1 = (Power output / 8 ) × 100
0.131 = power output / 8
Cross multiply to make the power output the subject of formula
Power output = 0.131 × 8
Power output = 1.048 W
Therefore, the light energy (not heat energy) generated by the bulb every second is 1.048 W
8. While taking a measurement, Ajay put the 2nd mark of the scale to the edge of the line and the mark that pointed to the end of the line was 80 cm. What is the total length of the line? Write the length of line in meter also.
Answer:
The length of line is 78 cm or 0.78 m.
Explanation:
initial reading 2 mark
final reading 80 cm
The length of the line
= final reading - initial reading
= 80 - 2
= 78 cm
1 cm = 0.01 m
So, 78 cm = 0.78 m
Amy put some salt in a weighing dish. Then she put the weighing dish on a sensitive balance to measure the mass of the salt. She removed the weighing dish from the balance and put it in several similar balances. She recorded the mass each time. Mass 1 Mass 2 Mass 3 Mass 4 Masse 5 5.608 g 5.607 g 5.608 g 5.608 g 5.609 g Amy forgot to subtract the mass of the empty weighing dish from her measurements, and she reported the mass of the salt as 5.608 grams. Amy's measurement of the salt's mass accurate because . Amy's measurement of the salt's mass precise because .
Answer:
Explanation:
i. Accuracy in measurement is a term that is used to describe the closeness of a measured value to its actual value. It relates the actual value to the measured values.
Therefore in the given question, Amy's measurement of the salt's mass is accurate because her final value is close to all the measured values.
ii. Precision in measurement is a term that is used to describe the closeness of different measured values to each other. It relates the keenness in the measured values.
Thus, Amy's measurements of the salt's mass is precise because the values of the masses are close to one another.
an unforgettable day
A lever is used to lift a heavy rock. The rock has a mass of 800 N. It requires 200 N of force to lift the rock using the lever. What is the MA of the lever?
Answer:
The answer for this solution is 4
Explanation:
MA=L/E
800/200
=4
Which combination we prefer for domestic circuit, parallel
or series? Give reason
Explanation:
For Domestic circuits parallel arrangement is always used because: In parallel circuits, if one electrical appliance stop working due to some effect then all other appliances keep working normally.
hope it helps
stay safe healthy and happy...If you lift a 80 N book 50 cm off the floor, how much work did you do?
1. 0
2. 4000 J
3. 40 J
4. 1.6 J
A man pushes a couch a distance of 0.75 m. If 450 J of work is done, what is the magnitude of the force applied?
1. 16.9 J
2. 45
3. 1350 J
4. 2700 J
Aslaam 3lekm m3akm yaseen my 8nat alninkm
Austin kicks a soccer ball with an initial velocity of 18.0 m/s at an angle of 35.0°. What are the horizontal and vertical components of the initial velocity?
Answer:
Vx = 14.74 m/s.
Vy = 10.32 m/s
Explanation:
Applying,
Vx = Vcos∅................ Equation 1
Where Vx = Horizontal component of the initial velocity, V = Intial Velocity, ∅ = Angle to the horizontal
From the question,
GIven: V = 18.0 m/s, ∅ = 35.0°
Substitute into equation 1
Vx = 18(cos35.0°)
Vx = 18(0.819)
Vx = 14.74 m/s.
Also for vertical component,
Vy = Vsin∅................... Equation 2
Where Vy = vertical component of the initial velocity
Substituting the values above into equation 2
Therefore,
Vy = 18(sin35°)
Vy = 10.32 m/s
a relative density bottle has a mass of 29.2 g when empty its mass is 116.2 g when it is full of liquid or diesel and when full of water it's mass is 129.2 g calculate the relative density of diesel
Answer:
0.87
Explanation:
Given :
Mass of bottle = 29.2 g
Mass when filled with diesel = 116.2 g
Mass when filled with water = 129.2 g
The mass of water = (Mass when filled with water - mass of bottle)
Mass of water = 129.2 - 29.2 = 100 g
Mass of diesel = (Mass when filled with diesel - mass of bottle)
Mass of diesel = 116.2 - 29.2 = 87
Relative density of diesel = mass of diesel / mass of equal volume of water
Relative density = 87 / 100 = 0.87
In a position vs time graph if the line is curved then the motion of the object may be
described as
Answer:
tge motion of the object is not constant or uniform
Answer: It may be speeding up or slowing down.
Explanation:
Assertion:The voltage- current graph will always be a straight line moving away from both the axes.
Reason:The current in a circuit is directly proportional to its voltage.
Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below.
(i) Both A and R are true and R is the correct explanation of the Assertion.
(ii) Both A and R are true but R is not the correct explanation of the Assertion.
(iii) A is true but R is false.
(iv) A is false but R is true
Answer:
the answer is (i)
Explanation:
Because it is true that the current in a circuit is directly proportional to its current
And that's according to ma views
The graph below shows the percentage of unstable nuclei remaining of a radioactive isotope.
Initially, there was 44g of the radioactive substance. How much of the substance is thereafter 60 minutes?
i have no clue, sorry. jus tryna get points
A car traveling at a speed of 30 m/s encounters an emergency and comes to a complete
stop (vf = 0 m/s). How much time will it take for the car to stop if its acceleration is -4 m/s2?
Answer:
Explanation:
Use the one-dimensional equation
[tex]v_f=v_0+at[/tex] which says that the final velocity of an object is equal to the object's initial velocity plus its acceleration times time. We are looking for time. That means the equation looks like this:
0 = 30 + (-4)t and
-30 = -4t so
t = 7.5 sec
The time taken for the car to stop if its acceleration is -4.0 m/s² is 7.5 seconds.
What is Equation of motion?
According to equation of motion, three motion equations commonly referred to as the rules of constant acceleration, exist for a uniform acceleration.
To derive the components such as displacement(s), velocity(initial =u and final = v), time(t), and acceleration(a), these equations are utilized.
The equations can be,
v=u + at or, v = u-atv²=u²+2as s= ut+1/2 at²As we have to Calculate the time :
The formula for the motion equation is
v = u - at
v - final velocity
u - initial velocity
a - acceleration
t - time
Here, v = 0 ,
u = 30 m/s
a = -4 m/s²
So substituting in, v = u - at
⇒0 = 30 - 4t
⇒4t = 30
⇒t = 30/4
t = 7.5 seconds
Therefore, the required time calculated is 7.5 seconds.
Learn more about the equation of motion,
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newton's law of universal gravitation
Explanation:
The gravitational force exerted on an object by another is equal to that which the other exerts on it.
F=GMm/r²
G=6.67x10-¹¹Nm²/Kg²
r= 80cm=0.8m
F= [6.67x10-¹¹ x 70 x 55]/0.8²
F= 4 x 10^-7N.
how does gravity maintain the the atmospheric layer around earth ?
Please explain in a very easy way
will mark as BRAINLIEST
Answer:
Our atmosphere is a mixture of gases that surround Earth. It is kept in place by the pull of Earth's gravity. If Earth was a much smaller planet, like Mercury or Pluto, its gravity would be to weak to hold a large atmosphere
Explanation:
If the object represented by the FBD below has a mass of 2.5 kg, what is the acceleration of the object?
Answer:
4 m/s² down
Explanation:
We'll begin by calculating the net force acting on the object.
The net force acting on the object from the left and right side is zero because the same force is applied on both sides.
Next, we shall determine the net force acting on the object from the up and down side. This can be obtained as follow:
Force up (Fᵤ) = 15 N
Force down (Fₔ) = 25 N
Net force (Fₙ) =?
Fₙ = Fₔ – Fᵤ
Fₙ = 25 – 15
Fₙ = 10 N down
Finally, we shall determine the acceleration of the object. This can be obtained as follow:
Mass (ml= 2.5 Kg
Net force (Fₙ) = 10 N down
Acceleration (a) =?
Fₙ = ma
10 = 2.5 × a
Divide both side by 2.5
a = 10 / 2.5
a = 4 m/s² down
Therefore, the acceleration of the object is 4 m/s² down
Part B: Explain why the cardboard would be a better item than the jump rope for
modeling the cell wall of a plant cell. (5 points)
The cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. A cell wall has layers and covers the plant cells in order to protect it. The cardboard can cover it more with its layers rather than the jump rope.
The cardboard would be a better item than the jump rope because the cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. The cardboard can cover it more with its layers rather than the jump rope.
What is a plant cell?A plant cell is a eukaryotic cell that contains a true nucleus and certain organelles to perform specific functions. However, some of the organelles present in plant cells are different from other eukaryotic cells.
What is the composition of a plant cell wall?The cell wall of a plant is made up of cellulose. Cellulose is a long, linear polymer of several glucose molecules.
Learn more about modeling the cell wall of a plant cell at
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summary on scaler quantity
Answer:
A quantity which does not depend on direction is called a scalar quantity. Vector quantities have two characteristics, a magnitude and a direction. Scalar quantities have only a magnitude. When comparing two vector quantities of the same type, you have to compare both the magnitude and the direction.
I rarely share my notes. But these are my last year notes, so I can share with you. Click on the photo to view the answer.
11.) An object that is NOT accelerating could be sitting still or:
OA) moving at a constant velocity
B) oscillating
turning a corner
D) moving slowly
Jerome has a tow truck, and he is in charge of moving several vehicles for the city. He wants to explain to his niece how towing vehicles relates to Newton's second law. Which statement should he use?
Answer:
Force = mass x acceleration
Explanation:
According to the Newton's second law, the net force acting on the object is proportional to the rate of change of momentum of the body.
So, Force is given by
F = m a
where, F is the force, m is the mass and a is the acceleration.
when the mass is more, the acceleration is less as the force applied by the truck is same.
What is the magnitude of the electric field strength at a point where an electron
experiences an electrostatic force of 8.3 x 10^-20 N?
Answer:
Explanation:
Use the equation
[tex]E=\frac{q}{F}[/tex] where the charge, q, on the electron is 1.602 × [tex]10^{-19[/tex] :
[tex]E=\frac{1.602*10^{-19}}{8.3*10^{-20}}[/tex] so
E = 1.9 C/N
Two persons are applying forces on two opposite sides of a moving cart.
The cart still moves with the same speed in the same direction. What
do you infer about the magnitudes and direction of the forces applied.
Answer:
the force is very strong between
Help quick physics area question
Answer: The area of brick in contact with the floor is 1539 [tex]cm^{3}[/tex].
Explanation:
Given: Length = 19 cm
Width = 9 cm
Height = 9 cm
As the brick is rectangular in shape. Hence, its area will be calculated as follows.
[tex]Area = length \times width \times height[/tex]
Substitute the values into above formula as follows.
[tex]Area = length \times width \times height\\= 19 cm \times 9 cm \times 9 cm\\= 1539 cm^{3}[/tex]
Thus, we can conclude that area of brick in contact with the floor is 1539 [tex]cm^{3}[/tex].
Which is used to name an ionic compound?
Answer:
An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element.
Porque deja de funcionar una estufa electrica cuando la electricidad es excesiva??
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#CarryOnLearning
a wheel and axle has another simple machine in it. what is it
Answer:
The wheel and axle is another simple machine. It uses a wheel with a rod attached in the middle as an axle to help it to lift or move loads. In some cases this machine works like a lever to multiply force (like with a doorknob or a fishing reel).
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experience. (You may use Tagalog or English)
Answer:
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