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bezimeni [28]
3 years ago
8

A general definition of media is "methods for communicating information." Please select the best answer from the choices provide

d. A. True B. False
Physics
1 answer:
igor_vitrenko [27]3 years ago
6 0

Answer:

A. True.

Explanation:

It['s true because the basic and general definition of media is "methods for communicating information".

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bumper car A (281 kg) moving +2.82 m/s makes an elastic collision with bumper car B (209 kg) moving -1.72 m/s. what is the veloc
USPshnik [31]

Answer:

The final velocity of the car A is -1.053 m/s.

Explanation:

For an elastic collision both the kinetic energy and the momentum of the system are conserved.

Let us call

m_A = mass of car A;

v_{A1} = the initial velocity of car A;

v_{A2} = the final velocity of car A;

and

m_B = mass of car B;

v_{B1} = the initial velocity of car B;

v_{B2} = the final velocity of car B.

Then, the law of conservation of momentum demands that

m_Av_{A1}+m_Bv_{B1} =m_Av_{A2}+m_Bv_{B2}

And the conservation of kinetic energy says that

\dfrac{1}{2} m_Av_{A1}^2+\dfrac{1}{2}m_Bv_{B1}^2=\dfrac{1}{2}m_Av_{A2}^2+\dfrac{1}{2}m_Bv_{B2}^2

These two equations are solved for final velocities  v_{A2} and v_{B2} to give

$v_{A2} =\frac{m_A-m_B}{m_A+m_B} v_{A1}+\frac{2m_B}{m_A+m_B} v_{B1}$

$v_{B2} =\frac{2m_A}{m_A+m_B} v_{A1}+\frac{m_B-m_A}{m_A+m_B} v_{B1}$

by putting in the numerical values of the variables we get

$v_{A2} =\frac{281-209}{281+209} (2.82)+\frac{2*209}{281+209} (-1.72)$

\boxed{v_{A2} = -1.05m/s}

and

$v_{B2} =\frac{2*281}{281+209} (2.82)+\frac{209-281}{281+209} (-1.72)$

\boxed{v_{B2} = 3.49m/s}

Thus, the final velocity of the car A is -1.053 m/s and of car B is 3.49 m/s.

4 0
3 years ago
When planning an experiment, a scientist must first choose a question to investigate. In an experiment, Renata changes the relea
dangina [55]

Answer:

The correct option is D

Explanation:

In the course of the experiment, two key phrases/variables defined the experiment done,

i) the release height of the steel ball (independent variable)

ii) the distance the ball travels from the ramp before falling to the ground (dependent variable)

The only option that contains and relates this two variables as carried out during the course of the experiment is option D.

6 0
3 years ago
1. It takes 120 minutes for a man to ride his bicycle up the road to Alpe d'Huez in France. The vertical height of the climb is
zloy xaker [14]
To1. PE = mgh

PE potential energy
m mass
g 9.81
h height

P = PE / t

P power
t time


3 0
3 years ago
What is force? Do systems have inputs, outputs, do they have both, do they have one, do they have the other, what are the system
Nady [450]

Answer:

A force is a push or pull upon an object resulting from the object's interaction with another object.

Systems always have inputs and outputs.

Explanation:

6 0
3 years ago
Read 2 more answers
What continent is at 20 south and 140 east?
Anna007 [38]
That point is in northwestern Queensland province, in Australia.
8 0
3 years ago
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