A bus starts to move from rest. if its velocity becomes 90 km per hour after 8s second. calculate acceleraton

Physics

1 answer:

topjm [15]3 years ago

7 0

90 km per hour = 25 metres per second

$a=\frac{v-u}{t}$

$a=\frac{25-0}{8}$

$a=3,13m/s^2$

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Two 25 kg children are sitting on a merry-go-round that is rotating at 0.10 rad/s. if one child is 1.0 m from the center and the

Grace [21]

The angular speed of the merry-go-round is
ω = 0.10 rad/s

The angular moment of inertia of a mass, m, at a radius, r, from the center of the wheel is
I = mr²

Therefore, the angular moment of inertia for the children are
I₁ = (25 kg)*(1.0 m)² = 25 kg-m²
I₂ = (25 kg)*(1.5 m)² = 56.25 kg-m²

The combined angular momentum is
ω(I₁ + I₂) = (0.10 rad/s)*(25 + 56.25 kg-m²)
= 8.125 (kg-m²)/s

Answer: 8.125 (kg-m²)/s

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Q7:<br> A 4 kg toy is lifted off the ground and falls at 3 m/s. What is the toy's energy?

alexandr1967 [171]

Answer:

The toy's energy is 18 J.

Explanation:

We have, a 4 kg toy is lifted off the ground and falls at 3 m/s. It is required to find toy's energy.

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