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3 years ago

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Physics physics physics physics

1 answer:

lara31 [8.8K]3 years ago

8 0

Physics is the branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact. It studies objects ranging from the very small using quantum mechanics to the entire universe using general relativity.

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A 20 g ball is fired horizontally with speed v0 toward a 100 g ball hanging motionless from a 1.0-m-long string. The balls un-de

sladkih [1.3K]

Answer:7.93 m/s

Explanation:

Given

mass of ball $m_1=20\ gm$

Mass of hanging ball $m_2=100\ gm$

Length of string $L=1\ m$

Maximum angle turned $\theta _{max}=50^{\circ}$

$v_o$ is the initial velocity of ball 1 and 0 is the initial velocity of ball 2

For Perfectly elastic final velocity of ball 1 and 2 is given by

$v_2'=\frac{2m_1}{m_1+m_2}\cdot v_1-\frac{m_1-m_2}{m_1+m_2}\cdot v_2$

$v_1'=\frac{m_1-m_2}{m_1+m_2}\cdot v_1+\frac{2m_2}{m_1+m_2}\cdot v_2$

where $v_1$ and $v_2$ are the velocity of 1 and 2 before collision

thus $v_2'=\frac{2\times 20}{120}v_0-0$

$v_2'=\frac{v_o}{3}$

$v_1'=\frac{20-100}{120}\times v_o+0$

$v_1'=-\frac{2}{3}v_o$

By energy conservation on second ball we get

Kinetic energy=Potential Energy

$\frac{1}{2}m_2(v_2')^2=m_2gL(1-\cos \theta )$

$v_2'=\sqrt{2gl(1-\cos \theta )}$

$v_2'=\sqrt{2\times 9.8\times 1(1-0.642)}$

$v_2'=2.64\ m/s$

thus $v_o=3\times v_2'=7.93\ m/s$

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3 years ago

Order these sounds from loudest (1)

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Answer:

1. Airplane

2. Crowd at sporting

3. Event

4. Rainfall

5. Whisper

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3 years ago

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Rohith has been jogging to the bus stop for 2.0 minutes at 3.5 m/s when he looks at

nikdorinn [45]

Multiply these numbers and there’s your answer

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A car is traveling at a constant speed of 20 m/s for 3 seconds. Then the driver puts on the brakes. The total distance the car t

yarga [219]

Answer:

15 seconds

Explanation:

If car was moving at 20m/s for 3 sec.

if car traveled 100m = 15 sec total

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3 years ago

Calculate the amount of energy produced in joules by 100- watt light bulb lit for 2.5 hours.

9966 [12]

100/2.5 is 40.
40 is the energy that is being produced

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4 years ago