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Sedaia [141]
3 years ago
14

George and Harriot walk with an average velocity of .95 m/s eastward. If it takes them 30

Physics
2 answers:
lara [203]3 years ago
8 0

Answer:

1.71km

Explanation

Velocity is defined as the change in displacement of a body with respect to time. Displacement specifies direction and as such is a vector quantity.

Mathematically;

Velocity = displacement/time

Displacement = velocity ×time

Given velocity of the body = 0.95m/s

Time = 30minutes

Time = (30×60)seconds

= 1800seconds

Displacement = 0.95×1800

Displacement = 1710m

Since 1000m = 1km

1710m to km will give;

1710/1000

= 1.71km

artcher [175]3 years ago
5 0

Answer:

1.71 km

Explanation:

Convert 30 minutes to seconds:

30 min × (60 s / min) = 1800 s

Find the displacement:

0.95 m/s × 1800 s = 1710 m

Convert to kilometers:

1710 m × (1 km / 1000 m) = 1.71 km

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A lightning bolt with 13 kA strikes an object for 14 μ s. How much charge is deposited on the object?
pogonyaev

Answer:

0.182C

Explanation:

Using Q= It

= 13x10^3 . 14x10^-6

= 0.182C

8 0
3 years ago
Q9 A physics book slides off a horizontal tabletop with a speed of 1.10 m/s. It strikes the floor in 0.350s. ignore air resistan
Rama09 [41]

Answer:

(a) 0.613 m

(b) 0.385 m

(c) vₓ = 1.10 m/s, vᵧ = 3.50 m/s

v = 3.68 m/s², θ = 72.6° below the horizontal

Explanation:

(a)  Take down to be positive.

Given in the y direction:

v₀ = 0 m/s

a = 10 m/s²

t = 0.350 s

Find: Δy

Δy = v₀ t + ½ at²

Δy = (0 m/s) (0.350 s) + ½ (10 m/s²) (0.350 s)²

Δy = 0.613 m

(b) Given in the x direction:

v₀ = 1.10 m/s

a = 0 m/s²

t = 0.350 s

Find: Δx

Δx = v₀ t + ½ at²

Δx = (1.10 m/s) (0.350 s) + ½ (0 m/s²) (0.350 s)²

Δx = 0.385 m

(c) Find: vₓ and vᵧ

vₓ = aₓt + v₀ₓ

vₓ = (0 m/s²) (0.350 s) + 1.10 m/s

vₓ = 1.10 m/s

vᵧ = aᵧt + v₀ᵧ

vᵧ = (10 m/s²) (0.350 s) + 0 m/s

vᵧ = 3.50 m/s

The magnitude is:

v² = vₓ² + vᵧ²

v = 3.68 m/s²

The direction is:

θ = atan(vᵧ / vₓ)

θ = 72.6° below the horizontal

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In what sense is energy from coal actually solar energy
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Explanation:

The energy stored in coal is directly form the sun which is solar energy. This energy are preserved in carbon atoms and they originate from the life processes of a plant.

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  • Green plants have special adapted structures by which they trap solar energy from the sun and use it to produce their own food.
  • The food is used by plant for nutrition and life activities.
  • In essence the solar energy is converted to chemical energy in plants.
  • To form coal, when plants are rapidly buried their organic matter is preserved from decay by combination with oxygen.
  • More burial preserves the complex molecules that have stored during photosynthesis.
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The Michelson-Morley experiment was designed to measure Group of answer choices the velocity of the Earth relative to the ether.
NISA [10]

Answer:

The Michelson-Morley was designed to detect the motion of the earth through the ether.

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