3 years ago

Can an object reverse its direction of travel while maintaining a constant acceleration?

1 answer:

7 0

Yes, think of a negative acceleration and an initial positive speed, the object slows down until it stops, and then the speed becomes negative, so it reverses the direction!

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C.) A thunderstorm
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3 years ago

An air-track glider undergoes a perfectly inelastic collision with an identical glider that is initially at rest. what fraction

DiKsa [7]

Refer to the diagram shown below.

The initial KE (kinetic energy) of the system is
KE₁ = (1/2)mu²

After an inelastic collision, the two masses stick together.
Conservation of momentum requires that
m*u = 2m*v
Therefore
v = u/2

The final KE is
KE₂ = (1/2)(2m)v²
= m(u/2)²
= (1/4)mu²
= (1/2) KE₁

The loss in KE is
KE₁ - KE₂ = (1/2) KE₁.

Conservation of energy requires that the loss in KE be accounted for as thermal energy.

Answer: 1/2

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4 years ago

Read 2 more answers

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.45 V/m at a poi

Mandarinka [93]

Answer:

4.43 kW

Explanation:

Since Intensity I = P/A = E²/2cμ₀ where P = Power, A = Area = 4πr² where r = distance from source = 61 m and E = electric field amplitude = 8.45 V/m.

P = E²A/2cμ₀ = E²4πr²/2cμ₀ = 2πE²r²/cμ₀

= 2π(8.45 V/m)²(61 m)²/3 × 10⁸ m/s × 4π × 10⁻⁷ Tm/A

= 4428.1 W

= 4.4281 kW ≅ 4.43 kW

6 0

3 years ago