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svlad2 [7]
3 years ago
12

Which of the following statements are true? (mark all that apply)

Physics
1 answer:
kvv77 [185]3 years ago
8 0

Answer:

(a) and (b)

Explanation:

Energy is the capacity to do work, and exists in various forms. These forms can be converted one to another by the use of appropriate means. Some examples are sound, mechanical, solar, light, which causes the sensation of vision, etc. energy is measured in Joules (J).

The rate of transfer of energy is called power.

i.e Power = \frac{energy}{time}

It is measured in Watts (W).

When a white light is disperses into its colors, gray and black are not part of the colors. And a black sometimes could be as a result of the absorption of all other colors of light.

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A group of atoms with aligned magnetic poles are known as which of the following?
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How long will it take to travel 200.000 m [N] traveling 10 m/s [N]?
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A(n) 1400-kg car going at 6.32 m/s in the positive x direction collides with a 2900-kg truck at rest. The collision is totally i
tresset_1 [31]

Answer:

a) Acceleration of the car is given as

a_{car} = -21 m/s^2

b) Acceleration of the truck is given as

a_{truck} = 10.15 m/s^2

Explanation:

As we know that there is no external force in the direction of motion of truck and car

So here we can say that the momentum of the system before and after collision must be conserved

So here we will have

m_1v_1 + m_2v_2 = (m_1 + m_2)v

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1400 (6.32) + 2900(0) = (1400 + 2900) v

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so we have

a_{car} = \frac{v_f - v_i}{t}

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a_{car} = -21 m/s^2

b) For acceleration of truck we will find the rate of change in velocity of the truck

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a_{truck} = \frac{v_f - v_i}{t}

a_{truck} = \frac{2.06 - 0}{0.203}

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3 years ago
6. Why does sound travel faster through a steel bar than through a swimming pool filled with water?
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In fact, sound waves travel over 17 times faster through steel than through air.

Sound waves travel over four times faster in water than it would in air.

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