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EastWind
1 month ago
10

When a charge is placed on a metal sphere, it ends up in equilibrium at the outer surface. Use this information to determine the

electric field of +3.0 µC charge put on a 5.0-cm aluminum spherical ball at the following two points in space:
a. A point 1.0 cm from the center of the ball (an inside point).
b. A point 10 cm from the center of the ball (an outside point)
Physics
1 answer:
Maru [3.3K]1 month ago
5 0

Answer:

a

The value at a point inside is Zero

b

The electric field is E = 2.7*10^{6} \ N/C

Explanation:

We know from the problem that

The charge magnitude is q = 3.0 \mu C = 3.0 *10^{-6} \ C

The radius of the spherical ball is r = 5.0 \ mm = 0.005 \ m

According to Gauss’s law, the enclosed charge within a conductor is zero which indicates that the electric field within the spherical ball is zero

On the outside, the electric field around the spherical ball is mathematically expressed as

E = \frac{kq}{ a^2}

Here a denotes a point outside the spherical ball with its value of a = 10 \ cm = \frac{10}{100} = 0.1 \ m

and k represents Coulomb's constant, valued at

k = 9*10^{9}\ kg\cdot m^3\cdot s^{-4} \cdot A^{-2}.

=> E = \frac{ 3 *10^{-6} * 9*10^9 }{ (0.1)^2}

=> E = 2.7*10^{6} \ N/C

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A rocket takes off vertically from the launch pad with no initial velocity but a constant upward acceleration of 2.25 m/s^2. At
kicyunya [3294]

Answer:

A) 328 m

B) 80.22 m/s

C) 8.18 sec

Explanation:

A)

The rocket's initial acceleration is 2.25 m/s²

Time until engine failure is 15.4 s

Initial velocity u during takeoff = 0 m/s

Distance covered while the engine is functional =?

We apply Newton's laws for this calculation

S = ut + \frac{1}{2}at^{2}

Here, S represents the distance traveled under the rocket's thrust

S = (0 x 15.4) + \frac{1}{2}(2.25 x 15.4^{2})

S = 0 + 266.81 m = 266.81 m

Before the engine fails, the final velocity can be found using:

v = u + at

v = 0 + (2.25 x 15.4) = 34.65 m/s

Once the engine fails, the rocket decelerates under gravitational pull at g = -9.81 m/s²  (acting downwards)

The upward initial velocity when freefall begins is v = 34.65 m/s

The final velocity is reached at peak height, where the rocket halts, therefore:

u = 0 m/s

The distance covered during this freefall will be s =?

Utilizing the equation

v^{2} = u^{2} + 2gs

0^{2} = 34.65^{2} + 2(-9.81 x s)

0 = 1200.6 - 19.62s

-1200.6 = -19.62s

s = -1200.6/-19.62 = 61.19 m

Thus,

Maximum Height = 266.81 m  + 61.19 m =  328 m

B)

At maximum height, the rocket’s initial upward velocity drops to 0 m/s (the rocket completely stops)

The descent occurs freely under g = 9.81 m/s² (acting downwards)

The distance covered during the fall will be 328 m

Final velocity v just prior to impact =?

Applying v^{2} = u^{2} + 2gs

v^{2} = 0^{2} + 2(9.81 x 328)

v^{2} = 0 + 6435.36

v = \sqrt{6435.36} = 80.22 m/s

The time taken before reaching the pad is found as follows

v = u + gt

80.22 = 0 + 9.81t

t = 80.22/9.81 = 8.18 sec

7 0
3 months ago
A spring with a spring constant of 0.70 N/m is stretched 1.5 m. What was the force?
inna [3103]

Answer:

1.05 N

Explanation:

K = 0.7 N/m

e = 1.5 m

F =?

According to Hooke's law:

F = Ke

= 0.7×1.5

= 1.05 N

5 0
3 months ago
Two golf carts have horns that emit sound with a frequency of 394 Hz. The golf carts are traveling toward one another, each trav
Sav [3153]
The frequency detected is 394 Hz. This question pertains to the Doppler effect, outlined by the equation fo = {c + vo}/{c - vs} × f. Here, fo is the observed frequency, c denotes sound speed at 345 m/s, vo is the observer's velocity of 9.5 m/s, and vs refers to the source's velocity of -9.5 m/s (the negative indicates opposite directions). The source's frequency is given as 394 Hz. Substituting the values leads to fo = {345 + 9.5}/{345 + 9.5} × 394. Simplifying yields fo = (354.5/354.5) × 394 = 1 × 394 = 394 Hz.
6 0
2 months ago
In a carnival game, the player throws a ball at a haystack. For a typical throw, the ball leaves the hay with a speed exactly on
serg [3582]

Réponse:

Ve(m) = √(19.2/m)

Ve(0.35) = 7.407 m/s

Explication:

Données:

- La masse de la balle = m

- La vitesse d'entrée de la balle est Vi = Ve

- La vitesse finale de la balle Vf = 0.5*Ve

- La force de frottement constante sur la balle due à la paille est F = 6 N

- L'épaisseur du tas de paille est s = 1.2 m

- On suppose que le lancer se fait horizontalement et qu'on ignore les effets de la gravité

Objectif:

Déterminer une expression pour la vitesse d'entrée typique en fonction de l'inertie de la balle

Quelle est la vitesse d'entrée typique si la balle a une inertie de 0.35 kg?

Solution:

- Pour connaître la vitesse d'entrée comme fonction de l'inertie, nous allons utiliser la troisième équation du mouvement comme suit:

                                    Vf² = Vi² + 2*a*s

où, a est l'accélération de la balle dans la paille. Nous utiliserons la loi du mouvement de Newton pour cela:

                                    F_net = m*a

La seule force agissant sur la balle en traversant la paille est la force de friction F:

                                    - F = m*a

                                    a = -F/m

- Insérer toutes les quantités dans la troisième équation du mouvement:

                                    (0.5Ve)² = Ve² - 2*F*s / m

                                    0.75Ve² = 2*F*s / m

                                    Ve = √(8*F*s/3*m)

- Remplacer les valeurs:

                                    Ve(m) = √(8*6*1.2/3*m)

                                    Ve(m) = √(19.2/m)

- Pour l'inertie de la balle m = 0.35 kg, la vitesse d'entrée est:

                                    Ve(0.35) = √(19.2/0.35)

                                    Ve(0.35) = 7.407 m/s

8 0
3 months ago
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