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Neko [114]
3 years ago
5

A projectile is fired with initial speed vo at an angle of 45o above the horizontal. Assume no air resistance.

Physics
1 answer:
katrin2010 [14]3 years ago
7 0

Answer:

The correct answer is a

Explanation:

At projectile launch speeds are

X axis     vₓ = v₀ = cte

Y axis     v_{y} = v_{oy} –gt

The moment is defined as

         p = mv

For the x axis

         pₓ = mvₓ = m v₀ₓ

As the speed is constant the moment is constant

For the y axis

        p_{y} = m v_{y} = m (v_{oy} –gt) = m v_{oy} - m (gt)

Speed ​​changes over time, so the moment also changes over time

Let's examine the answer

i   True

ii False.  The moment changes with time

The correct answer is a

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Answer:

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Explanation:

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A black stone was discovered to have magnetic properties.
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Answer:

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Explanation:

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3 years ago
A simple machine can change the direction of a force.<br> O True<br> O False
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☁️ Answer ☁️

annyeonghaseyo!

Your answer is:

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4 0
2 years ago
2.10-kg box is moving to the right with speed 8.50 m&gt;s on a horizontal, frictionless surface. At t = 0 a horizontal force is
larisa86 [58]

Explanation:

Below is an attachment containing the solution.

8 0
3 years ago
Read 2 more answers
A student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. The wheel is subj
KATRIN_1 [288]

Answer:

\Delta t = 8 s

Explanation:

As we know that the angular acceleration of the wheel due to friction is constant

so we can use kinematics

\theta = \omega_i t + \frac{1}{2}\alpha t^2

so we have

(65 \times 2\pi) = (2\pi \times 9)(10) + \frac{1}{2}(\alpha)(10^2)

130\pi = 180\pi + 50 \alpha

\alpha = -\pi rad/s^2

now time required to completely stop the wheel is given as

\omega_f = \omega_i + \alpha t

0 = (2\pi \times 9) + (-\pi) t

t = 18 s

now time required to stop the wheel is given as

\Delta t = 18 - 10

\Delta t = 8 s

6 0
3 years ago
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