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lilavasa [31]
3 years ago
9

g A small object of mass 2.5 g and charge 18 uC is suspended motionless above the ground when immersed in a uniform electric fie

ld perpendicular to the ground. What is the magnitude and direction of the electric field
Physics
1 answer:
kvasek [131]3 years ago
4 0

Answer: 1361.11\ N/C,\text{upward}

Explanation:

Given

Mass of particle is m=2.5\ gm

Charge of particle is q=18\ \mu C

Electrostatic force must balance the weight of the particle

\lim_{n \to \infty} a_n \Rightarrow mg=qE\\\\\Rightarrow E=\dfrac{2.5\times 9.8\times 10^{-3}}{18\times 10^{-6}}\\\\\Rightarrow E=1361.1\ N/C

Direction of the electric field is in upward direction such that it opposes the gravity force.

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3 years ago
The position x of a particle moving along x axis varies with time t as x = Asin(wt) , where A and w are constants . The accelera
Elodia [21]

Let's see

\\ \rm\Rrightarrow x=Asin(\omega t)\dots(1)

Now we know the formula of acceleration

\\ \rm\Rrightarrow \alpha=-A\omega^2sin(\omega t)

\\ \rm\Rrightarrow \alpha=-Asin(\omega t)\times \omega^2

  • From eq(1)

\\ \rm\Rrightarrow \alpha=-x\omega^2

Or

\\ \rm\Rrightarrow \alpha=-\omega^2x

6 0
2 years ago
Read 2 more answers
three masses are connected by a light string that passes over a frictionless pulley as shown. (a) what is there acceleration of
Ket [755]

The mass on the left has a downslope weight of  

W1 = 3.5kg * 9.8m/s² * sin35º = 19.7 N  

The mass on the right has a downslope weight of  

W2 = 8kg * 9.8m/s² * sin35º = 45.0 N  

The net is 25.3 N pulling downslope to the right.  

(a) Therefore we need 25.3 N of friction force.  

Ff = 25.3 N = µ(m1 + m2)gcosΘ = µ * 11.5kg * 9.8m/s² * cos35º  

25.3N = µ * 92.3 N  

µ = 0.274  

(b) total mass is 11.5 kg, and the net force is 25.3 N, so  

acceleration a = F / m = 25.3N / 11.5kg = 2.2 m/s²  

tension T = 8kg * (9.8sin35 - 2.2)m/s² = 27 N  

Check: T = 3.5kg * (9.8sin35 + 2.2)m/s² = 27 N √

hope this helps.   :)

3 0
4 years ago
When Sequoia measured the sound from the tube open at one end and closed at the other, she only observed three, equally-spaced,
Andrei [34K]

Answer: v= 330m/s

Explanation: the length (l) of an open closed pipe is related to the wavelength (λ) as shown in the formulae below

l = λ/4

where l = 0.55m, hence we have that

0.55 = λ/4

λ = 0.55*4

λ = 2.2m

from the question, it can be seen that the fundamental frequency is 150Hz.

Recall that we have v=fλ, where v = speed of wave, f= frequency, λ= wavelength

v =2.2 * 150

v = 330 m/s

6 0
3 years ago
A rectangular block measures 4.1 cm by 2.8 cm by 2.1 cm.
ipn [44]

Answer:v=l x w x h

Explanation:

h=height

w=width

l=length

5 0
3 years ago
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