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lisabon 2012 [21]
3 years ago
10

A car with a mass of 3 Kg and velocity of 40 m/s collided with a truck of a velocity of 60 m/s, if the momentum is conserved wha

t is the mass of the truck?
Physics
1 answer:
Luden [163]3 years ago
4 0

Answer:

the mass of the truck is 2 kg.

Explanation:

Given;

mass of the car, m₁ = 3 kg

initial velocity of the car, u₁ = 40 m/s

initial velocity of the truck, u₂ = 60 m/s

let the mass of the truck = m₂

Apply the principle of conservation of linear momemtum;

m₁u₁ = m₂u₂

m₂ = (m₁u₁) / u₂

m₂ = (3 x 40) / (60)

m₂ = 2 kg

Therefore, the mass of the truck is 2 kg.

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Norma-Jean [14]
The power of the antenna is
P=1.00 kW=1000 W
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E=Pt = (1000 W)(1 s)=1000 J

The frequency of the emitted photons is
f=2515 MHz=2.515 \cdot 10^9 Hz
So the energy of a single photon is
E_1=hf=(6.6 \cdot 10^{-34} Js)(2.515 \cdot 10^9 Hz)=1.66 \cdot 10^{-24} J

Therefore, to find the number of emitted photons per second, we should divide the total energy emitted by the antenna in 1 second by the energy of a single photon:
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8 0
3 years ago
A disk ring of inner radius a and outer radius b lying on the y − z plane has a uniform surface electric charge density +σ(>
solmaris [256]

Answer:

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Explanation:

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The area of ​​a ring is

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So the charge is

        dq = σ  2π r dr

We substitute

       V = k σ 2pi ∫ r dr / √(r² + x²)

We integrate

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b) the electric field and the potential are related

        E = - dV / dx

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