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4 years ago

All science-related careers involve working in a laboratory True Or False

Physics

2 answers:

RideAnS [48]4 years ago

7 0

The correct answer is false.

oee [108]4 years ago

5 0

The answer is false.

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A spring hangs from the ceiling with an unstretched length of x 0 = 0.35 m . A m 1 = 6.3 kg block is hung from the spring, causi

Jlenok [28]

Answer:

x₂=0.44m

Explanation:

First, we calculate the length the spring is stretch when the first block is hung from it:

$\Delta x_1=0.50m-0.35m=0.15m$

Now, since the stretched spring is in equilibrium, we have that the spring restoring force must be equal to the weight of the block:

$k\Delta x_1=m_1g$

Solving for the spring constant k, we get:

$k=\frac{m_1g}{\Delta x_1}\\\\k=\frac{(6.3kg)(9.8m/s^{2})}{0.15m}=410\frac{N}{m}$

Next, we use the same relationship, but for the second block, to find the value of the stretched length:

$k\Delta x_2=m_2g\\\\\Delta x_2=\frac{m_2g}{k}\\\\\implies \Delta x_2=\frac{(3.7kg)(9.8m/s^{2})}{410N/m}=0.088m$

Finally, we sum this to the unstretched length to obtain the length of the spring:

$x_2=0.35m+0.088m=0.44m$

In words, the length of the spring when the second block is hung from it, is 0.44m.

3 0

4 years ago

You plan to throw stones by using a sling that you whirl over your head. You will whirl the stone in a horizontal circle with a

MariettaO [177]

Answer:

$330.635$ meter per second square

Explanation:

Given

Height ,h $= 2.50$ m

Radius, r $= 1.50$ m

Distance travelled, $d = 15.9$ m

Since, the stone is released and it falls towards the sky, its initial velocity is zero

As per equation

$h = ut + \frac{1}{2} gt^2\\$ , we will evaluate "t"

Substituting the given values in above equation, we get

$2.5 = 0 *t + 0.5 * 9.81 * t^2\\t^2 = \frac{2.5}{0.5*9.81}\\ t = \sqrt{0.5096} \\t = 0.714$

Velocity

$= \frac{d}{t} \\= \frac{15.9}{0.714}\\= 22.27$

centripetal acceleration

$= \frac{v^2}{r} \\= \frac{22.27^2}{1.5}\\ = 330.635\\$

6 0

4 years ago

What is the frequency of a clock waveform whose period is 750 microseconds?

Allushta [10]

Use this formula to find your answer...

Determine the frequency of a clock waveform whose period is 2us or (micro) and 0.75ms

frequency (f)=1/( Time period).

Frequency of 2 us clock =1/2*10^-6 =10^6/2 =500000Hz =500 kHz.

Frequency of 0..75ms clock =1/0.75*10^-3 =10^3/0.75 =1333.33Hz =1.33kHz.

6 0

3 years ago

A car collides into a concrete wall going 25.0 m/s . It stops in 0.141 seconds and has a change in momentum of 39,400. What is t

vodka [1.7K]

Answer:

Mass of the car is 1576 kg.

Explanation:

Let the mass of the car be $m$ kg.

Given:

Initial velocity of the car is, $u=25\ m/s$

As the car stops, final velocity of the car is, $v=0\ m/s$

Change in momentum is, $\Delta p=39400$

Now, we know that, momentum is given as the product of mass and velocity.

So, change in momentum is given as:

$\Delta p=m(u-v)\\39400=m(25-0)\\39400=25m\\m=\frac{39400}{25}\\m=1576\ kg$

Therefore, the mass of the car is 1576 kg.

4 0

3 years ago

Suppose heat has caused convection currents to from in a fluid. When the heat source is removed from the fluid, the convection c

RideAnS [48]

The answer to the question is (C)
Hope this helps :)

7 0

3 years ago