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Salsk061 [2.6K]
3 years ago
5

1200kg car speeds up from 2 m/s to 6 m/s. How many times greater is the car's kinetic

Physics
1 answer:
Bezzdna [24]3 years ago
3 0

Answer:

9 times as great

Explanation:

KE = 1/2mv²

  1. 1/2(1200)(2)² = 2,400 J
  2. 1/2(1200)(6)² = 21,600 J

21,600 / 2,400 = 9

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<span>Newton's first law of Motion is often referred to as the "Law of Inertia."</span>
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The engine power of a car engine is rated 600 hp at 2600 rpm. What is the torque provided by the engine?
attashe74 [19]

Answer:

1212 N

Explanation:

P  = Power of the car engine = 600 hp

w  = angular speed of rotation in the engine = 2600 rpm

\tau = Torque provided by the engine

Power of the car engine is given as

P = \frac{\tau w}{5252}

Inserting the values

600 = \frac{\tau (2600)}{5252}

\tau = 1212 N

5 0
3 years ago
50 grams of ice cubes at -15°C are used to chill a water at 30°C with mass mH20 = 200 g. Assume that the water is kept in a foam
Arada [10]

Answer : The final temperature is, 25.0^oC

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of ice = 2.09J/g^oC

c_2 = specific heat of water = 4.18J/g^oC

m_1 = mass of ice = 50 g

m_2 = mass of water = 200 g

T_f = final temperature = ?

T_1 = initial temperature of ice = -15^oC

T_2 = initial temperature of water = 30^oC

Now put all the given values in the above formula, we get:

50g\times 2.09J/g^oC\times (T_f-(-15))^oC=-200g\times 4.184J/g^oC\times (T_f-30)^oC

T_f=25.0^oC

Therefore, the final temperature is, 25.0^oC

5 0
3 years ago
A piece of aluminium foil is held between a bar magnet and a paperclip. What will happen to the paper clip?
Nuetrik [128]

Answer:the paper clip will be attracted to the magnet

Explanation:

7 0
3 years ago
Define average atomic mass and explain how it is calculated
Flauer [41]

Answer:

The average atomic mass of an element is the sum of masses of it's isotopes

Each are multiplied by it's natural abundance

Explanation:

The average atomic mass of an element is the sum of masses of it's isotopes

Each are multiplied by it's natural abundance

7 0
3 years ago
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