3 years ago

Which of the following examples illustrates Newton’s second law of motion?

Physics

2 answers:

3241004551 [841]3 years ago

7 0

It would be the second one

Anuta_ua [19.1K]3 years ago

6 0

Answer: much less force is required to push an empty shopping cart than a shopping cart

Explanation:

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According to diagonal rule, the orbital with lowest energy in the given following is ________.

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The orbital with the lowest energy is 3s.

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3 years ago

A time-varying horizontal force F(t) = At4 + Bt2 acts for 0.500 s on a 12.25-kg object, starting attime t = 1.00 s. In the SI sy

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Answer:

3.82 Ns

Explanation:

Time varying horizontal Force is given as

F(t) = A t⁴ + B t²

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$I = \int_{0}^{t}Fdt$

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$I = \int_{0}^{1}(4.50 t^{4} + 8.75 t^{2})dt$

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$I = 3.82 N-s$

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Gestalt therapists focus much of their work on helping clients get in touch with their feelings. Do you feel

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A record player turntable initially rotating at 3313 rev/min is braked to a stop at a constant rotational acceleration. The turn

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Answer:

(A) It will take 22 sec to come in rest

(b) Work done for coming in rest will be 0.2131 J

Explanation:

We have given the player turntable initially rotating at speed of $33\frac{1}{3}rpm=33.333rpm=\frac{2\times 3.14\times 33.333}{60}=3.49rad/sec$

Now speed is reduced by 75 %

So final speed $\frac{3.49\times 75}{100}=2.6175rad/sec$

Time t = 5.5 sec

From first equation of motion we know that '

$\alpha =\frac{\omega -\omega _0}{t}=\frac{2.6175-3.49}{4}=-0.158rad/sec^2$

(a) Now final velocity $\omega =0rad/sec$

So time t to come in rest $t=\frac{0-3.49}{-0.158}=22sec$

(b) The work done in coming rest is given by

$\frac{1}{2}I\left ( \omega ^2-\omega _0^2 \right )=\frac{1}{2}\times 0.035\times (0^2-3.49^2)=0.2131J$

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2 years ago