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tigry1 [53]
3 years ago
15

Object A has initial momentum p in the forward direction, but loses momentum at a rate of 0.35 kg·m/s2 until it stops moving. Ac

cording to Newton's second law, what event must be occurring
Physics
1 answer:
aliina [53]3 years ago
8 0

Answer: a. net force is acting on object A in the same direction of its motion.

Explanation:

The second law of Newton states that the acceleration of a particular object is dependent on two main things which are the mass and force. According to the law, the acceleration of the object will be directly related to the net force while the acceleration is also relates inversely to the mass.

Therefore, based on the information given in the question, a force is acting on object A in the same direction of its motion.

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The natural resistance of any object to change its speed is called _____.
Kay [80]

Answer: Inertia

Explanation: Objects to stay in motion or at rest unless there is an external unbalanced force aced upon the object.

3 0
4 years ago
Please help.
Alex787 [66]

Explanation:

<em>math</em><em>ematically</em><em>,</em>

<em>kinetic \: energy \:  =  \frac{1}{2} m {v}^{2}</em>

<em>wher</em><em>e</em><em> </em><em>m</em><em>=</em><em> </em><em>mass</em>

<em>and</em><em> </em><em>v</em><em>=</em><em>veloc</em><em>ity</em>

<em>giv</em><em>en</em><em> </em><em>that</em><em>,</em><em> </em>

<em>kinet</em><em>ic</em><em> energy</em><em>=</em><em>4</em><em>9</em><em>3</em><em>9</em><em>0</em><em>0</em><em>J</em>

<em>mass</em><em> </em><em>=</em><em>5</em><em>0</em><em>4</em><em>0</em><em>k</em><em>g</em>

<em>maki</em><em>ng</em><em> </em><em>velo</em><em>city</em><em> </em><em>the</em><em> </em><em>su</em><em>bject</em>

<em>v =  \sqrt{ \frac{2 \times kinetic \: energy}{mass} }</em>

<em>sub</em><em>stitute</em><em> </em><em>the</em><em>ir</em><em> </em><em>valu</em><em>es</em><em> </em><em>in</em><em> </em><em>the</em><em> </em><em>formu</em><em>la</em>

<em>v =  \sqrt{ \frac{2 \times 493900}{5040} }</em>

<em>v =  \sqrt{ \frac{987800}{5040} }</em>

<em>v =  \sqrt{196}</em>

<em>v = 14m {s}^{ - 1}</em>

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6 0
3 years ago
The y-position of a damped oscillator as a function of time is shown in the figure.
NISA [10]

(1) The period of the oscillator is 1 second.

(2) The damping coefficient is 0.93.

<h3>What is period of oscillation?</h3>

The period of oscillation is the time taken to make one complete cycle.

From the graph, the time taken to make one complete oscillation is 1 second.

<h3>Damping coefficient</h3>

equation of the wave is given as;

y(t) = Ae^(-btx) cos(ωt)

<h3>at time, t = 0, y = 3.5</h3>

3.5 = Ae^(-0) cos(0)

3.5 = A x 1

A = 3.5 cm

<h3>at time, t = 1 cm, y = - 3cm</h3>

-3 = 3.5e^(-bx) cos(ω)

-3/3.5 = e^(-bx) cos(ω)

-0.857 = e^(-bx) cos(ω)

-0.857 / cos(ω) =  e^(-bx)

ln[-0.857 / cos(ω)] = -bx  

ln[-0.857 / cos(ω)] / b = - x  ---- (1)

<h3>at time, t = 2 cm, y = - 2cm</h3>

-2 = 3.5e^(-2bx) cos(2ω)

-0.57 = e^(-2bx) cos(2ω)

ln[-0.57 / cos(2ω)] = -2bx  

ln[-0.57 / cos(2ω)] /2b = - x  ------(2)

solve (1) and (2)

ln[-0.57 / cos(2ω)]/2b = ln[-0.857 / cos(ω)] /b

-0.57 / cos(ω) = 2(-0.857 / cos(ω))

2(-0.857/cosω) = -0.57/cos2ω

-(2 x 0.857) / (-0.57) = cosω/cos 2ω

3 = cosω/cos 2ω

3(cos 2ω) =  cosω

3(2cos²ω - 1) = cos ω

6cos²ω - 6 = cosω

6cos²ω  - cosω - 6 = 0

let cosω  = y

6y² - y - 6 = 0

solve the quadratic equation;

y = 1.1 or -0.92

cosω = -0.92

ω  = arc cos(-0.92)

ω  = 2.74 rad/s

From equation (1)

ln[-0.857 / cos(ω)] / x = -b  ---- (1)

let x = 1

ln(-0.857/cos(2.74) = -b

-0.93 = -b

b = 0.93

Thus, the damping coefficient is 0.93.

Learn more about damping coefficient here: brainly.com/question/14058210

#SPJ1

4 0
2 years ago
Your high-fidelity amplifier has one output for a speaker of resistance 8 Ω. How can you arrange two 8-Ω speakers, one 4-Ω speak
ANTONII [103]

Answer:

(a) 8Ω (b)  Ratio = Parra/P8 ohm = 1

Explanation:

Solution

Recall that,

An high-fidelity amplifier has one output for a speaker of resistance of = 8 Ω

Now,

(a) How can  two 8-Ω speakers be  arranged, when one =  4-Ω speaker, and one =12-Ω speaker

The Upper arm is : 8 ohm, 8 ohm

The Lower arm is : 12 ohm, 4 ohm

The Requirement is  = (16 x 16)/(16 + 16) = 8 ohm

(b) compare  your arrangement  power output of with the power output of a single 8-Ω speaker

The Ratio = Parra/P8 ohm = 1

8 0
4 years ago
wich of the folling is best definition of vectors (quantities described by both force and gravity)(quantities described by boths
Nookie1986 [14]

Answer:

Option D is quantities described by both magnitude and direction is the correct answer.

Explanation:

A scalar is quantity with magnitude only. It does not have direction. Examples of scalar are distance, speed, time etc.

A vector is quantity with both magnitude and direction. Some examples for vectors are displacement, velocity, acceleration, force, moment, electric field, magnetic field etc.

Here option A, quantities described by both force and gravity is not correct.

Option B is quantities described by both speed and movement is also not correct.

Option C is quantities described by both velocity and acceleration is also not correct.

Option D is quantities described by both magnitude and direction is the correct answer.

3 0
3 years ago
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