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Ierofanga [76]
3 years ago
6

An object is dropped from rest and falls freely 20 m to Earth. When is the speed of the object 9.8 m/s?

Physics
1 answer:
My name is Ann [436]3 years ago
6 0
During the entire time of its fall because as soon as it falls that’s what the speed it will be until acted on by a outside force
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An object travels along a straight, horizontal surface with an initial speed of 2 ms. The position of the object as a function o
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Answer:

The options are not provided, so i will answer in a general way.

We know that:

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The speed is 2m/s

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Now, remember the relation:

Distance = Speed*Time

Then we can write the position as a function of time as:

P(t) = 2m/s*t + P0

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Then the equation is:

P(t) = 2m/s*t

And the graph is something like:

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3 years ago
Besides the force due to gravity or g, what else determines the period of a pendulum?
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Length of the cord..........................................................

6 0
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Two remote control cars with masses of 1.16 kilograms and 1.98 kilograms travel toward each other at speeds of 8.64 meters per s
Black_prince [1.1K]

The initial momentum of the system can be expressed as,

p_i=m_1u_1+m_{2_{}}u_2

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p_f=m_1v_1+m_{2_{}}v_2

According to conservation of momentum,

p_i=p_f

Plug in the known expressions,

\begin{gathered} m_1u_1+m_2u_2=m_1v_1+m_2v_2 \\ m_2v_2=m_1u_1+m_2u_2-m_1v_1 \\ v_2=\frac{m_1u_1+m_2u_2-m_1v_1}{m_2} \end{gathered}

Initially, the second mass move towards the first mass therefore the initial speed of second mass will be taken as negative and the recoil velocity of first mass is also taken as negative.

Plug in the known values,

\begin{gathered} v_2=\frac{(1.16\text{ kg)(8.64 m/s)+(1.98 kg)(-3.34 m/s)-(1.16 kg)(-2.16 m/s)}}{1.98\text{ kg}} \\ =\frac{10.02\text{ kgm/s-}6.61\text{ kgm/s+}2.51\text{ kgm/s}}{1.98\text{ kg}} \\ =\frac{5.92\text{ kgm/s}}{1.98\text{ kg}} \\ \approx2.99\text{ m/s} \end{gathered}

Thus, the final velocity of second mass is 2.99 m/s.

3 0
1 year ago
Q7 Describe two types of atomic change that produce electromagnetic<br> waves.
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When a neutron or a proton in the nucleus changes a gamma ray is produced (gamma rays are electromagnetic waves)

When an electron drops from a higher energy level to a lower energy level an electromagnetic wave is give off.
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