Joey is riding in an elevator which is accelerating upwards at 2.0 m/s2. The elevator weighs 300.0 kg, and Joey weighs 60.0 kg.
1 answer:
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Answer:
Final velocity will be equal to 0.321 m/sec
Explanation:
We have given mass of clay model of lion
Its speed is 0.85 m/sec, so
Mass of another clay model
It is given that second clay is motionless
So its velocity
Now according to conservation of momentum
Momentum before collision will be equal to momentum after collision
So , here v is velocity after collision
So
v = 0.321 m/sec
So final velocity will be equal to 0.321 m/sec
Answer:
The original volume of the first bar is half of the original volume of the second bar.
Explanation:
The coefficient of cubic expansivity of substances is given by;
γ = ΔV ÷ (Δθ)
Given: two metal bars with equal change in volume, equal change in temperature.
Let the volume of the first metal bar be represented by , and that of the second by
.
Since they have equal change in volume,
Δ = Δ
= ΔV
For the first metal bar,
2γ = ΔV ÷ (Δθ)
⇒ Δθ = ΔV ÷ (2γ)
For the second metal bar,
γ = ΔV ÷ (Δθ)
⇒ Δθ = ΔV ÷ (γ)
Since they have equal change in temperature,
Δθ of first bar = Δθ of the second bar
ΔV ÷ (2γ) = ΔV ÷ (
γ)
So that;
(1 ÷ 2) = (1 ÷
)
2 =
=
Thus, original volume of the first bar is half of the original volume of the second bar.