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3 years ago

How can speed be defined

Physics

2 answers:

Anna11 [10]3 years ago

6 0

Explanation:

C) distance / time

.......

Tomtit [17]3 years ago

4 0

Answer:

Speed can be defined in (C) distance / time.

I hope this helped at all.

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Jumping up before the elevator hits. After the cable snaps and the safety system fails, an elevator cab free-falls from a height

kondaur [170]

Answer:

a) impulse = 2.5 × 10³Ns

b) average force on the passenger during the collision = 8.3 × 10⁵ N

Explanation:

Given that

Elevator cab free fall = 39.0m

The passenger = 92kg

Collision time = 3.00ms

The impulse is given by

J = Δp

$= m(v_f - v_i)$

where m is the mass ,

v(f) is final velocity

v(i) is initial velocity which is equal to 0

from the conservation energy system, the kinectic enegy of the passenger equal the potential energy of the pasenger

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$V_f = \sqrt{2gh} \\ = \sqrt{2 \times 9.8 \times 39 }\\ = 27.65ms\\impulse = 92 \times 27.65\\= 2.5 \times 10^3Ns$

J = 2.5 × 10³Ns

b) Average force is given by

F(avg) = J / Δt

$F_a_v_g = \frac{2,5 \times 10^3}{3 \times 10 ^-^3} \\8.3 \times 10^5N$

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4 years ago

Three equal 1.55-μC point charges are placed at the corners of an equilateral triangle whose sides are 0.500 m long. What is the

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Answer:

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$U=k\dfrac{q^2}{d}$

In this system with three charges which are equidistant from each other

$U=k\dfrac{q^2}{d}+k\dfrac{q^2}{d}+k\dfrac{q^2}{d}$

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The potential energy of the system is 0.12959085 J

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3 years ago

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Answer:

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