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2 years ago

14

If you were trying to cross a river with the shortest possible time, would you aim your boat slightly upstream, directly across

the river, or slightly downstream?

1 answer:

Katyanochek1 [597]2 years ago

7 0

I would say downstream since the stream can push your boat, then you would have momentum and would just have to row towards the land.

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A string has its 4th harmonic at 31.5 Hz. What is the fundamental frequency?

seropon [69]

Given data

*The given 4th harmonic frequency is 31.5 Hz

The fundamental frequency is calculated as

$\begin{gathered} f_n=\frac{31.5}{4} \\ =7.875\text{ Hz} \end{gathered}$

Hence, the fundamental frequency is 7.875 Hz

5 0

11 months ago

A person kicks a ball, giving it an initial velocity of 20.0 m/s up a wooden ramp. When the ball reaches the top, it becomes air

Bess [88]

Answer:

Explanation:

given,

initial velocity of the ball = 20 m/s

angle of ramp = 22°

ball travel at a distance = 5 m

a) for friction less

$\dfrac{1}{2}mv^2 = \dfrac{1}{2}mu^2 - mgh$

$v^2 = u^2 - 2gh$

$v = \sqrt{u^2- 2 g h cos 22^0}$

$v = \sqrt{20^2- 2\times 9.8 \times 5 cos 22^0 }$

v = 17.58 m/s

b) considering the friction

$\dfrac{1}{2}mv^2 = \dfrac{1}{2}mu^2 - mgh-\mu_kmgl$

$v^2 = u^2 - 2gh-2\mu_kmgl$

$v = \sqrt{u^2- 2 g h cos 22^0-2\mu_kgl}$

$v = \sqrt{20^2- 2\times 9.8 \times 5 cos 22^0-2\times 0.15\times 9.8 \times 5 }$

v = 17.16 m/s

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2 years ago

Which one of the following temperatures (in °C) is equivalent to 294 K?

vaieri [72.5K]

Answer:

21

Explanation: its actually 20.85 but i guess they round to 21

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2 years ago

United States citizens have many ways to participate in national life. The most common form of participation is?

Travka [436]

Answer:

You would have to give better explanation on subject.

Explanation:

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2 years ago

If you break a piece of glass, the shape of the glass changes, but the properties in the

lutik1710 [3]

Answer:

It would be a physical change because you aren't changing to chemical properties of the glass, just the shape.

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2 years ago