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lukranit [14]
3 years ago
12

When a liquid is cooled, the kinetic energy of the particles ?

Physics
1 answer:
vodka [1.7K]3 years ago
4 0
When a liquid is cooled, the kinetic energy of the particles, DECREASES..
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Identical point charges (+50 x 10 power -6C) are placed at the corners of a square with sides of 2.0-m length. How much external
Gnesinka [82]

Answer:

636.4 J

Explanation:

The potential energy between one of the charges at the corner of the square and the fifth identical charge is U = kq²/r where q = charge = +50 × 10⁻⁶ C  and r = distance from center of square. = √2 m (since the midpoint of the sides = 1 m, so the distance from the charge at the corner to the center is thus √(1² + 1²) = √2)

Since we have four charges, the additional potential energy to move the charge to the centre of the square is U' = 4U = 4kq²/r

U' = 4kq²/r

= 4 × 9 × 10⁹ Nm²/C² (+50 × 10⁻⁶ C)²/√2 m

= 900 Nm²/√2 m

= 636.4 J

8 0
3 years ago
How could rescue workers use squeezing or compressing to get energy to their flashlights during rescue missions?
svlad2 [7]

Answer:

They can do this with the help of mechanical power generated from the human muscle.

Explanation:

Since rescue workers engage in missions where it is usually difficult for them to get electrical energy to their devices and working tools, they could employ various materials that can be sourced around them to get energy to their tools. One of such is the mechanical power generated from the human body through squeezing and compressing.

Some green devices such as the dyno torch have been designed to be powered through this method. Repeated squeezing of its flywheel allows light to be generated.

6 0
3 years ago
I NEED HELP ASAP DUE IN 30 MINUTES!!!
Softa [21]

Answer:

Explanation:It is commonly judged by how a vehicle performs particularly during cornering, acceleration, and braking as well as on the vehicle's directional stability when ...

6 0
2 years ago
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A rope exerts a 35N force on an object at an angle of 12N degrees above the horizontal. What horizontal and vertical components
nekit [7.7K]

Answer:

The horizontal component of the force, F_x= 34.24 \ N

The  vertical component of the force, F_y=7.28 \ N

Explanation:

Given;

Force on the rope, F = 35 N

angle between the rope and the horizontal = 12 °

The horizontal component of the force is given by;

F_x = Fcos \theta\\\\F_x = 35cos(12^0)\\\\F_x = 34.24 \ N

The vertical component of the force is given by;

F_y = Fsin\theta\\\\F_y = 35sin(12^0)\\\\F_y = 7.28 \ N

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3 years ago
Why can a device never be 100% efficient? Explain.
sesenic [268]

Answer:

No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible.

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