Why is weight measured in newtons
Answers
Because weight is a force, and the SI unit of force is the Newton.
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O a. is shown only as the planetary model
b. shows exactly what an atom looks like
c. helps to visualize processes that cannot be seen with our eyes
d. magnifies what the eye can't see
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Answers
The correct answer is C. Velocity is a vector and requires a direction.
Explanation:
In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.
Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.
The difference between speed and velocity is that C) velocity is a vector and requires a direction
Further explanation
Vector is a quantity that has a value and direction
Vector can be symbolized in the form of directed line segments
while the length of the vector is denoted by | a |
Vectors can be written in the form of sequential pairs which shows their coordinates in the Cartesian plane: a (a₁, a₂)
with length
If the direction of the vector is reversed, we get the vector -a which has the same length but in the opposite direction
Operations on vectors include addition and subtraction. Addition of vector a and vector b can be done in a triangular way where the base point of vector b coincides with the endpoint of vector a
The sum of the two is obtained by pulling the line segment from the base point of the vector a to the endpoint of the vector b which results in a new vector c
So a + b = c
If vector a is added by inverse b (-b) then the sum becomes a + (- b) = a-b
If a vector is multiplied by a scalar number (eg denoted by k) then the new vector becomes k | a |.
If k> 0, the new vector is in the direction of vector a, but if k <0 it will be in the opposite direction
A vector has a direction and a magnitude, while a scalar has only a magnitude.
Examples of scalars are: length, mass, time, speed
Examples of vectors are: force, acceleration, velocity
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the average velocity
resultant velocity
the coin velocity
Keywords: vector, speed, velocity
Answers
Sedimentary rocks are the result of igneous rocks breaking down.This is a slow process so there is not as much broken down as there is not broken down.
Explanation:
Because sedimentary rocks are made of minerals deposited in layers at earth's surface. The processes, temperatures, and pressures that make other rocks damage or deflate any fossils in them.
Answers
-- Cut a piece off.
-- Sand the surface smooth.
-- Melt it.
-- Paint it a different color.
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The free-body diagram of your question is; 2 downward forces (253 kg mass of barbell & 133 kg body mass of Kurlovich) acting together on a point supported by 2 upward forces as normal forces exerted by Kurlovich's feet.
Solving the normal forces exerted by 2 feet :
Summation of Forces Vertical = 0
2 Dowwnard Forces = 2 Upward Forces (2F)
253 + 133 = 2F
2F = 386 Kgs
F = 386 / 2
F = 193 Kgs (Normal Force Exerted by Each Foot)
Final answer:
To calculate the normal force exerted on each of Vladimir Kurlovich's feet while lifting the barbell, we need to consider the weights of Kurlovich and the barbell. The normal force is equal to the sum of the two weights.
Explanation:
To calculate the normal force exerted on each of Vladimir Kurlovich's feet while lifting the barbell, we need to consider the weight of Kurlovich and the weight of the barbell. The normal force is equal to the sum of Kurlovich's weight and the weight of the barbell, as it balances the gravitational force pulling them downwards. Kurlovich's weight can be calculated using his mass and the acceleration due to gravity, which is approximately 9.8 m/s².
Step 1:
Calculate Kurlovich's weight:
Mass = 133 kg
Acceleration due to gravity = 9.8 m/s²
Weight = Mass × Acceleration due to gravity
Weight = 133 kg × 9.8 m/s²
Step 2:
Calculate the weight of the barbell:
Mass = 253 kg
Acceleration due to gravity = 9.8 m/s²
Weight = Mass × Acceleration due to gravity
Weight = 253 kg × 9.8 m/s²
Step 3:
Calculate the normal force exerted on each foot:
Normal force = Kurlovich's weight + Barbell's weight
Learn more about Calculating normal force here:
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4 J
B.
40 J
C.
400 J
D.
4000 J
Answers
The correct answer to the question is C) 400 J.
CALCULATION:
As per the question, the force applied on the block F = 40 N.
The distance travelled by the block S = 10 m.
We are asked to calculate the work done by the block.
The work done by a body under a force F is calculated as -
Work done W =
=
Here, is the angle between force and displacement.
If , then work done W =
= FS. [ cos0 = 1]
Hence, the work done by the block W = FS
= 40 N × 10 m
= 400 Joule. [ans]
Here, Joule is the unit of work.
Hence, the work done by the block s 400 Joule.