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Scrat [10]
3 years ago
12

A drag racer starts her car from rest and

Physics
1 answer:
olga nikolaevna [1]3 years ago
6 0

Answer:

10.9 s

Explanation:

Given:

Δx = 367 m

v₀ = 0 m/s

a = 6.2 m/s²

Find: t

Δx = v₀ t + ½ at²

367 m = (0 m/s) t + ½ (6.2 m/s²) t²

t ≈ 10.9 s

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2 years ago
3. Two spherical objects at the same altitude move with identical velocities and experience the same drag force at a time t. If
Daniel [21]

Answer:

Object 2 has the larger drag coefficient

Explanation:

The drag force, D, is given by the equation:

D = 0.5 c \rho A v^2

Object 1 has twice the diameter of object 2.

If d_2 = d

d_1 = 2d

Area of object 2, A_2 = \frac{\pi d^2 }{4}

Area of object 1:

A_1 = \frac{\pi (2d)^2 }{4}\\A_1 = \pi d^2

Since all other parameters are still the same except the drag coefficient:

For object 1:

D = 0.5 c_1 \rho A_1 v^2\\D = 0.5 c_1 \rho (\pi d^2) v^2

For object 2:

D = 0.5 c_2 \rho A_2 v^2\\D = 0.5 c_2 \rho (\pi d^2/4) v^2

Since the drag force for the two objects are the same:

0.5 c_1 \rho (\pi d^2) v^2 = 0.5 c_2 \rho (\pi d^2/4) v^2\\4c_1 = c_2

Obviously from the equation above, c₂ is larger than c₁, this means that object 2 has the larger drag coefficient

8 0
3 years ago
What is the relationship between electricity and magnetism? A. A moving magnet creates a current, and a still magnet creates a c
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I'm trusting my gut and saying it's B.
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3 years ago
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