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liubo4ka [24]
4 years ago
12

in your own words provide two advantages of using meters as a measurement of length rather than old measurements of length such

as hands or steps
Physics
1 answer:
Arlecino [84]4 years ago
3 0

Answer:

First, the meters is the unit used in almost all the world today.

Then using meters as your unit will be easier to read and interpret for a larger number of people than if you use an older system, like hands or steps.

And because of the fact that almost all the world uses the meter as the unit for length, almost all the equations and formulas are written in meters.

Precision: The meter is exactly defined as:

"The length of the path traveled by light in a vacuum in 1/299,792,458 of a second"

So the meter is an exact (and accepted) unit.

Then using this unit for measures of length also provides some " legitimacy" for you measure.

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A 112 g hockey puck glides across a frictionless ice surface with no horizontal forces acting on it. If the puck's velocity is 2
Burka [1]
22.5 m/s
This is because the puck will not slow down, and maintain a constant velocity.
7 0
4 years ago
A thin cylindrical shell is released from rest and rolls without slipping down an inclined ramp that makes an angle of 30° with
NNADVOKAT [17]

Answer: 1.59 sec

Explanation:

The kinetic energy contained in the rotation of the cylinder is 1/2 m v^2

The kinetic energy of translation is also 1/2 m v^2

so the total energy is m v^2

The force applied is mg sin (theta)

= m x 9.8 x 1/2

= 4.9 m

Now equate

F x d = m v^2

4.9 m x 3.1 = m v^2

v^2 = 4.9 x 3.1

v = sqrt(4.9 x 3.1) = 3.9 m/s

Acceleration.

V^2 = 2 a s

4.9 x 3.1 = 2 x a x 3.1

4.9 = 2 a

a = 2.45 m/s^2

Time

T = v/a

= 3.9/2.45

= 1.59 sec

6 0
4 years ago
every morning Tom walks along a straight road from his home to a bus stop,a distance of 160 meters.The graph shows his journey o
Assoli18 [71]

Answer:

Tom walked until he was 100 metres from his home. Then, he realised that he had dropped his homework, so he turned around and went 60 metres to pick it up again. He again turned back and started to walk faster to get to the bus stop on time. He got to the bus stop 100 seconds after leaving his home and waited for the bus.

Explanation:

4 0
3 years ago
Which statements describe properties of stars check all that apply
VikaD [51]

Answer:

Stars produce energy through nuclear fusion.

Stars are massive objects composed of gas.

Stars are composed primarily of hydrogen and helium.

Explanation:

Stars are massive objects that have a large gravitational field, which drives the star to contract on itself, which is why fusion occurs: in the center of the star the nuclei of atoms are already so close due to gravity and high temperatures that bind. This is what is called nuclear fusion and is the energy source of a star.

On the other hand yes, the main elements of a star are hydrogen and helium (two hydrogen nuclei fuse to make helium), this makes the star mainly a huge ball of gas so there is no solid surface where you can stand on.

And about water on a star, that is not possible. Temperatures on stars are very very high that water could not exist in a liquid form on them.

7 0
3 years ago
During the time a compact disc (CD) accelerates from rest to a constant rotational speed of 477 rev/min, it rotates through an a
atroni [7]

Answer:

<em>126.01 rad/s^2</em>

<em></em>

Explanation:

since it starts from rest, initial angular speed ω' = 0 rad/s

angular speed N = 477 rev/min

angular speed in rad/s ω = \frac{2\pi N}{60} =  \frac{2*3.142* 477}{60} = 49.95 rad/s

angular displacement ∅ = 1.5758 rev

angular displacement in rad/s = 2\pi N = 2 x 3.142 x 1.5758 = 9.9 rad

angular acceleration \alpha = ?

using the equation of angular motion

ω^2 = ω'^2 + 2\alpha∅

imputing values, we have

49.95^{2}  = 0^{2}  + (2 *\alpha*9.9 )

2495 = 19.8\alpha

\alpha = 2495/19.8 = <em>126.01 rad/s^2</em>

8 0
3 years ago
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