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Andrew [12]
3 years ago
12

Numerical Problems

Physics
1 answer:
Evgesh-ka [11]3 years ago
4 0

Answer:

a = 5 [m/s²]

Explanation:

To solve this problem we must use the following equation of kinematics.

v_{f}=v_{o}+a*t

where:

Vf = final velocity = 20 [m/s]

Vo = initial velocity = 10 [m/s]

t = time = 2 [s]

a = acceleration [m/s²]

Now replacing:

20 =10 +a*2\\10=2*a\\a=5[m/s^{2} ]

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_____ provide a picture of an electric field indicating a field’s strength.Question 15 options:CapacitorsElectric potential diff
kaheart [24]

Electric field lines are a pictorial way to represent the electric field of a charge which basically indicates the field's strength.

The electric field is strong when the lines are close together and weak when they are far away from each other.

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Hence, electric field lines provide a picture of an electric field indicating a field’s strength.

The correct option is Electric field lines

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1 year ago
What minimum heat is needed to bring 250 g of water at 20 ∘C to the boiling point and completely boil it away? The specific heat
Amiraneli [1.4K]

Answer:633.8 KJ

Explanation:

Given

mass of water\left ( m\right )=250gm

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heat of vaporization\left ( L\right )=22.6\times 10^5 J/kg

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Q=mc\left ( T_f-T_i\right )+mL

Q=0.25\times 4190\times \left ( 100-20\right )+0.25\times 22\times 10^5

Q=\left ( 0.838+5.5\right )\times 10^5

Q=6.338\times 10^5J=633.8 KJ

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4 years ago
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False

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Sharing valence electrons to make a bond creates a covalent bond, not an ionic bond.

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