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Tema [17]
3 years ago
14

A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to

rise?
A.The molecules in the water move closer together. B.The molecules in the thermometer’s liquid spread apart.C.The kinetic energy of the water molecules decreases. D.The kinetic energy of the thermometer’s liquid molecules decreases. 
Physics
1 answer:
yKpoI14uk [10]3 years ago
5 0
It would be D. The kinetic energy would rise.
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If a freely suspended vertical spring is pulled in downward direction and then released, which type of wave is produced in the s
larisa [96]

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Explanation:

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3 years ago
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What force in Newton is required to accelerate a car starting from rest to 20 m/s in 15 seconds if the mass of the car is 2500 k
Lyrx [107]

We will solve this question using the second law of motion which states that force is directly equal to the product of mass and acceleration.

\sf \: F=ma

Where,

  • F is force
  • m is mass
  • a is acceleration

In our case,

  • F = ?
  • m = 2500 kg
  • a = 20m/s

\tt \: F_{net}  = 2500 \times 20 \\   \tt= 50000

<em>Thus, The force of 50000 Newton is required to accelerate a car of 2500 kg...~</em>

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3 years ago
In 1.71 minutes, a ski lift raises four skiers at constant speed to a height of 148 m. The average mass of each skier is 62.9 kg
Vitek1552 [10]

Answer:

3560.36 Watts

Explanation:

Power, P=\frac {nΔW}{Δt) where P is power, n is the number of skiers, t is time in seconds and Δt is change in time, ΔW is given by mgh where m is mass, g is gravitational constant, h is height

Substituting n for 4 skiers, m for 62.9 Kg, g for 9.81, h for 148 m and t for 1.71*60=102.6 seconds

P=\frac {4*62.9*9.81*148}{1.71*60}=3560.360702  Watts

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