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3 years ago

If a net force of 34.3 N is required to move the system in the figure to the right 2.3 m in 1.3 seconds what is the systems mass

2 answers:

7 0

Mass of the system is 25.2 kg
Calculation:

F=ma

m = F/a where a = m/t^2

a=2.3/(1.3)^2 = 1.36 m/s^2

m=34.3/1.36

m=25.2 Kg

Jlenok [28]3 years ago

3 0

Answer:

m = 12.6 kg

Explanation:

As we know that it covers total distance of 2.3 m in 1.3 s

so we will have

$v_i = 0$

$d = 2.3 m$

$t = 1.3 s$

now we can use kinematics to find the acceleration

$d = v_i t + \frac{1}{2}at^2$

$2.3 = \frac{1}{2}a(1.3^2)$

$a = 2.72 m/s^2$

Now we can use Newton's law

$F = ma$

$34.3 = m(2.72)$

$m = 12.6 kg$

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The quantity of charge q (in coulombs) that has passed through a surface of area 2.00 cm2 varies with time

Makovka662 [10]

Explanation:

We have,

Surface area, $A=2\ cm^2=0.0002\ m^2$

The current varies wrt time t as :

$q(t) = 4t^3 + 5t + 6$

(a) At t = 2 seconds, electrical charge is given by :

$q(t) = 4t^3 + 5t + 6\\\\q(2) = 4(2)^3 + 5(2) + 6\\\\q=48\ C$

(b) Current is given by :

$I=\dfrac{dq}{dt}\\\\I=\dfrac{d(4t^3 + 5t + 6)}{dt}\\\\I=12t^2+5$

Instantaneous current at t = 1 s is,

$I=12(1)^2+5=17\ A$

Current density is given by electric current per unit area.

$J=\dfrac{I}{A}\\\\J=\dfrac{(12t^2+5)}{0.0002}\\\\J=5000(12t^2+5)\ A/m^2$

Therefore, it is the required explanation.

7 0

3 years ago

Physical Science convert 5.3 hl to dal

Nikitich [7]

Answer: 53 dal

Explanation: 5.3x10=53, to get dal you have to multiply by 10 to get 5.3x10=53.

Hope this helped! Please mark Brainliest!

3 0

2 years ago

Dario, a prep cook at an Italian restaurant, spins a salad spinner and observes that it rotates 20.0 times in 5.00 seconds and t

BabaBlast [244]

Answer:

$-\frac{8\pi}{3}rad/s^2$

Explanation:

To solve this problem we need to apply the concept related to Angular Acceleration. We can find it through the equation

$\omega_f^2-\omega_i^2=2\alpha\theta$

Where for definition,

$\omega_i = \frac{\theta}{t}$

The number of revolution $(\theta)$ was given by 20 times, then

$\omega_i = \frac{20*2pi}{5}$

$\omega = 8\pi rad/s$

We know as well that the salad rotates 6 more times, therefore in angle measurements that is

$\theta = 6*2\pi rad = 12\pi rad$

The cook at the end stop to spin, then using our first equation,

$0-8\pi = 2\alpha (12\pi)$

re-arrange to solve $\alpha$ ,

$\alpha = \frac{-8\pi}{2*12\pi}$

$\alpha = -\frac{8\pi}{3}rad/s^2$

We can know find the required time,

$\omega_f-\omega_i = \alpha t$

Re-arrange to find t, and considering that $\omega_f=0$

$t= \frac{\omega_i}{\alpha}$

$t=\frac{-8\pi}{-8\pi/3}$

$t=3s$

Therefore take for the salad spinner to come to rest is 3 seconds with acceleration of $-\frac{8\pi}{3}rad/s^2$

6 0

3 years ago

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Which countries were considered the three major Axis Powers?

wariber [46]

The main Axis powers were Germany, Japan and Italy. The Axis leaders were Adolf Hitler (Germany), Benito Mussolini (Italy), and Emperor Hirohito (Japan)

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2 years ago

You are caring for a person who was involved in an automobile collision. The woman is complaining of pain in her abdomen, nausea

Anna71 [15]

Answer:

I would suspect internal bleeding.

Explanation:

Internal Bleeding. As she has pain in abdomen and nausea means she is loosing blood. As result of low blood in body vessels, she is feeling great thirst as well as sugar level is going down.

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3 years ago