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Lady bird [3.3K]

4 years ago

15

Which choice is a valid way to construct a motion diagram?

1 answer:

tigry1 [53]4 years ago

8 0

Answer:

A valid way to construct a motion diagram is to take a series of photographs of a moving object at equal time intervals of time, perpendicular to the direction of motion and overlaying the images to observe the position change with time.

Explanation:

In order to develop a motion diagram, a coordinate system, a zero and appropriate scale should be chosen. Generally positions to the right of the origin are considered positive. Velocity can be determined from the motion diagram by plotting velocity vectors.

The acceleration of an object can also be calculated from the motion diagram.

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A 70.0-kg skier is sliding at 4 m/s when they slide down a 2m high hill. At the bottom of the hill they run into a large 2800 N/

Katarina [22]

Answer:

$\Delta x=245\ mm$

Explanation:

Given:

mass of skier, $m=70\ kg$

initial velocity of skier, $u=4\ m.s^{-1}$

height of the hill, $h=2\ m$

spring constant, $k=2800\ N.m^{-1}$

<u>final velocity of skier before coming in contact of spring:</u>

Using eq. of motion:

$v^2=u^2+gh$

$v^2=4^2+9.8\times 2$

$v=5.9666\ m.s^{-1}$

<u>Now the time taken by the skier to reach down:</u>

$v=u+gt$

$5.9666=4+9.8\ t$

$t=0.2007\ s$

<u>Now we calculate force using Newton's second law:</u>

$F=\frac{dp}{dt}$

$F=\frac{m(v-u)}{t}$

$F=\frac{70\times(5.9666-4)}{0.2007}$

$F\approx686\ N$

<u>∴Compression in spring before the skier momentarily comes to rest:</u>

$\Delta x=\frac{F}{k}$

$\Delta x=\frac{686}{2800}$

$\Delta x=0.245\ m$

$\Delta x=245\ mm$

4 0

3 years ago

What is the transfer of heat via circulation of a liquid or gas?

Artemon [7]

The answer is Convection

7 0

4 years ago

Read 2 more answers

Please help<br>What is the angle of the reflected ray in the diagram above?

Elena-2011 [213]

I think a reflected ray should be symmetrical so I believe your answer is 32 degrees

5 0

3 years ago

There are four springs stretched by the same mass. Spring A stretches 25 cm. Spring B stretches

juin [17]

Answer:

Spring C

Explanation:

According to Hooke's law, a force require to compress or extend a spring is directly proportional to the distance from its mean position.

The force of compression or expansion of the spring is given by the formula,

F = k x

Where,

k - spring constant. It is the constant value of the particular spring

x - distance of expansion or compression from mean position.

The x value of different spring,

A = 25 cm

B = 10 cm

C = 100 cm

D = 1 cm

The highest value of x for the same mass has the smallest spring constant according to the equation.

Hence, C has the smallest spring constant.

7 0

3 years ago

Which of the following is not true about arid deserts?

andrezito [222]

Answer:

The answer is actually b

Explanation:

B.

The rain falls mostly as snow during the winter.

3 0

3 years ago