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3 years ago

Name the physical quantity measured by the velocity-time graph?

1 answer:

7 0

The so-called "velocity-time" graph is actually a "speed-time" graph. At any point
on it, the 'x'-coordinate is a time, and the 'y'-coordinate is the speed at that time.

'Velocity' is a speed AND a direction. Without a direction, you do not have a velocity,
and these graphs never show the direction of the motion. It seems to me that it would be
pretty tough to draw a graph that shows the direction of motion at every instant of time,
so my take is that you'll never see a true "velocity-time" graph.

At best, it would need a second line on it, whose 'y'-coordinate referred to a second
axis, calibrated in angle and representing the 'bearing' or 'heading' of the motion at
each instant. The graph of uniform circular motion, for example, would have a straight
horizontal line for speed, and a 'sawtooth' wave for direction.

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When a 40-n force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is

Genrish500 [490]

<span>F= ma force is directed on the working surface so 40 = m x 2 hence m must be 20 units needed are probably kg</span>

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3 years ago

(Please help, will give thanks + brainliest answer)

Bond [772]

Answer:

A) 1.9m/s

Explanation:

Use the equation v=d/t

The time is 10 seconds. The distance is more complicated because it’s a circle so u use the equation for circumference C=2•pi•r. So you just do the circumference over time and get the answer. Hope this helps

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4 years ago

The Atomic Mass of an element is

dedylja [7]

Answer:

C) A ratio based on the mass of a carbon-12 atom

Explanation:

For each element, there is a characteristic number of protons, this number represent a type of atom and its called the atomic number

On the other hand we have the number of neutrons, and for one element which difers only on the number of neutrons, we have different isotopes from one element.

Together, protons and neutrons define the mass number

One property linked with the mass number, is the atomic mass, which is formerly expressed as "uma" (atomic mass unit)

By definition, one atom of carbon-12 (with 6 neutrons) has an atomic mass of 12 umas

6 0

4 years ago

Read 2 more answers

An iron robot falls from rest at a great height. neglecting air resistance, what is its speed after it has fallen for 3.5 second

algol13

In an uniformly accelerated motion, the velocity of the object follows the law:
$v(t) = v_0 + at$
where $v_0$ is the initial velocity, a the acceleration and t the time.

In our problem, the robot starts from rest, so the initial speed is zero: $v_i =0$ . The robot is in free fall, so the acceleraion is the gravitational acceleration $g=9.81 m/s^2$ . therefore, after a time $t=3.5 s$ , the velocity is
$v(3.5 s)= 0 + (9.81 m/s^2)(3.5 s)=34.3 m/s$

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4 years ago

Froghopper insects have a typical mass of around 11.3 mg and can jump to a height of 58.8 cm. The takeoff velocity is achieved a

allochka39001 [22]

Answer:

2874.33 m/s²

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

$v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{v^2-0^2}{2\times h}\\\Rightarrow v^2=2ah\ m/s$

Now H-h = 0.588 - 0.002 = 0.586 m

The final velocity will be the initial velocity

$v^2-u^2=2as\\\Rightarrow 0^2-u^2=2gs\\\Rightarrow -2ah=2\times g(H-h)\\\Rightarrow -2a0.002=2\times g0.586\\\Rightarrow a=-\frac{0.586\times -9.81}{0.002}\\\Rightarrow a=2874.33\ m/s^2$

Acceleration of the frog is 2874.33 m/s²

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4 years ago