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3 years ago

Please help me with this problem for physics !

Physics

1 answer:

Westkost [7]3 years ago

4 0

Answer:

2 m/s²

Explanation:

velocity =

$\frac{20 - 0}{10}$

20/10 = 2

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Ball A 1.55kg moving right at 8.76 m/s makes a head-on collision with ball B (0.752 kg) moving left at 11.4 m/s. After, ball B m

Illusion [34]

1.15 m/s to the left (3 sig. fig.).

<h3>Explanation</h3>

Momentum is conserved between the two balls if they are not in contact with any other object. In other words,

$p_{\text{A,initial}} + p_{\text{B,initial}}=p_{\text{A,final}} + p_{\text{B,final}}$

$m_\text{A} \cdot v_{\text{A,initial}} + m_\text{B}\cdot v_{\text{B,initial}}=m_\text{A}\cdot v_{\text{A,final}} + m_\text{B}\cdot v_{\text{B,final}}$ , where

$m$ stands for mass and
$v$ stands for velocity, which can take negative values.

Let the velocity of objects moving to the right be positive.

$m_\text{A} = 1.55\;\text{kg}$ ,
$m_\text{B} = 0.752\;\text{kg}$ .

Before the two balls collide:

$v_\text{A} = +8.76\;\text{m}\cdot\text{s}^{-1}$ ,
$v_\text{B} = -11.4\;\text{m}\cdot\text{s}^{-1}$ .

After the two balls collide:

$v_\text{A}$ needs to be found,
$v_\text{B} = +9.03\;\text{m}\cdot\text{s}^{-1}$ .

Again,

$m_\text{A} \cdot v_{\text{A,initial}} + m_\text{B}\cdot v_{\text{B,initial}}=m_\text{A}\cdot v_{\text{A,final}} + m_\text{B}\cdot v_{\text{B,final}}$ ,

$1.55 \times (+8.76) + 0.752 \times (-11.4) = 1.55\;{\bf v_{\textbf{A,final}}} + 0.752 \times (+9.03)$ .

$v_{\text{A,final}} = \dfrac{1.55 \times (+8.76) + 0.752 \times (-11.4)-0.752 \times (+9.03)}{1.55} = -1.15\;\text{m}\cdot\text{s}^{-1}$ .

$v_{\text{A,final}}$ is negative? Don't panic. Recall that velocities to the right is considered positive. Accordingly, negative velocities are directed to the left.

Hence, ball A will be travelling to the left at 1.15 m/s (3 sig. fig. as in the question) after the collision.

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3 years ago

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The distance between which points is one wavelength?

Stella [2.4K]

C and E shows 1 wavelength

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4 years ago

A 55 g soapstone cube--a whisky stone--is used to chill a glass of whisky. Soapstone has a density of 3000 kg/m3, whisky a densi

cupoosta [38]

Answer:

$N=0.37N$

Explanation:

Mass $m=55g=>0.055kg$

Soapstone Density $\rho_s=3000kg/m^2$

Whisky Density $\rho_w=940kg/m^2$

Generally the equation for Force is mathematically given by

$F=U+N$

Therefore

$N=m*g-(\frac{m}{\rho_s})*\rho_w*g$

$N=0.055*9.81 - {(\frac{0.055}{3000})*940*9.81}$

$N=0.37N$

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Electromagnetic waves are arranged on the electromagnetic spectrum by...

hram777 [196]

Answer:

by the range of frequencies and wavelength

Explanation:

this is because radio waves have the longest wavelength but the lowest frequency

however

gamma rays have highest frequency but shortest wavelength

hope it helps if not please report it so that someone else gets to try it out

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How does Lightning occur<br><br>

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When a storm is formed, the storm clouds contain negative charges and the ground is filled with positive charges. Similar to the way magnets work the two are attracted. The the collision of the two charges produce an electrical discharge.

I hope this helped!

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