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professor190 [17]
4 years ago
10

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a

velocity of 30 meters/second?
Physics
2 answers:
skad [1K]4 years ago
8 0
The answer would be a=5 m/s^2
I hope this helps you, have a great day!
gayaneshka [121]4 years ago
3 0

Answer:

The acceleration of a ball is 5 m/s².

Explanation:

Given that,

Initial velocity = 20 m/s

Time = 2.0 sec

Final velocity = 30 m/s

We need to calculate the acceleration

Using equation of motion

v =u+at

a =\dfrac{v-u}{t}

Where, v = final velocity

u = initial velocity

t = time

Put the value into the formula

a =\dfrac{30-20}{2.0}

a=5\ m/s^2

Hence, The acceleration of a ball is 5 m/s².

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The speed of light in vinegar is 2.30 x 10^8 m/s. Determine the index of refraction. (2​
pantera1 [17]

Answer:

n _{v} =  \frac{c}{v}  \\  =  \frac{3 \times  {10}^{8} }{2.30 \times  {10}^{8} }  \\  = 1.30

6 0
3 years ago
The capacitance of the variable capacitor of a radio can be changed from 100 to 350 pF by turning the dial from 0° to 180°. With
tangare [24]

Answer:

0.7 mJ

Explanation:

<u>Identify the unknown:  </u>

The work required to turn the dial from 180° to 0°  

<u>List the Knowns:  </u>

Capacitance when the dial is set at 180°: C = 350 pF = 350 x 10^-12 F Capacitance when the dial is set at 0°: C = 100 pF = 100 x 10^-12 F  

Voltage of the battery: V = 130 V  

<u>Set Up the Problem:</u>  

<em><u>Energy stored in a capacitor: </u></em>

U_c=1/2*V^2*C

      =1/2*Q^2/C

<em><u>When the dial is set at 180°:</u></em><em>  </em>

U_c=1/2*(130)^2*350*10^-12=10^-4

Q=√2*U_c*C=4*10^-7

<u><em>When the dial is set at 0°:</em></u>  

U_c=1/2*(4*10^-7)^2/100*10^-12

      =8*10^-4 J

<u><em>Solve the Problem:  </em></u>

ΔU_c=7*10^-4 J

        =0.7 mJ

note:

there maybe error in calculation but method is correct

4 0
3 years ago
Read 2 more answers
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3 years ago
Which of these accurately identify characteristics of light and mechanical waves? Select the TWO (2) that apply.
Tanzania [10]

The two correct statement are A and B. Light waves are electromagnetic waves that can travel through a vacuum. Mechanical waves can travel through a vacuum.

<h3>What is an electromagnetic wave?</h3>

EM waves are the electromagnetic radiations are made up of electromagnetic waves created when an electric field collides with a magnetic field.

Electromagnetic waves may alternatively be defined as the combination of oscillating electric and magnetic fields.

Electrically charged particles experiencing acceleration create electromagnetic waves, which can then interact with other charged particles and exert force on them.

The two correct statement is;

1. Light waves are electromagnetic waves that can travel through a vacuum.

2. Mechanical waves can travel through a vacuum.

Hence,two correct statement are A and B.

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brainly.com/question/8553652

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4 0
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As an aid in working this problem, consult concept simulation 5.2. car a uses tires for which the coefficient of static friction
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