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2 years ago

Cars A and B have the same mass, but Car A's speed is 15 mph, whereas Car B is moving at 60 mph. The kinetic energy

Physics

1 answer:

kupik [55]2 years ago

7 0

Answer:

16 times that of car A

Explanation:

Moving objects have kinetic energy which is calculated using the formula:

E=(1/2)mv² where m is the mass of the object and v is its velocity.

For car A, kinetic energy =1/2×m×15²

=112.5m........................................i

For car B, the kinetic energy =1/2×m×60²

=1800m......................................ii

dividing ii by i we get

1800m/112.5m= 16.07

Therefore The kinetic energy of car B is 16.07 times that of car A

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3 years ago

The component of the external magnetic field along the central axis of a 18 18 turn circular coil of radius 27.0 27.0 cm decreas

madreJ [45]

Answer:

Induced current I = 0.44 A

Explanation:

given data

no of turn N = 18

radius = 27.0 cm

resistance of the coil = 4.50 Ω

time = 2.90 s

magnetic field = 1.90 T to 0.500 T

solution

we get Induced EMF that is

E = - dφ ÷ dt ..............1

E = - N × A × (B2 - B1) ÷ Δt

E = N × A × (B1 - B2) ÷ Δt

area of cross section of the coil A = π × r²

area of cross section = 3.14 × (0.27)²

area of cross section = 0.228 m²

Initial magnetic field B1 = 1.9 T

and

Final magnetic field B2 = 0.5 T

time Δt = 3.7 s

put here value and we get

E = $\frac{18 \times 0.228 \times (1.9-0.5)}{2.90}$

E = 1.98 V

and

Induced current I is express as

Induced current I = E ÷ R ................2

Induced current I = $\frac{1.98}{4.5}$

Induced current I = 0.44 A

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