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3 years ago

Timed! i would really appreciate some help! will try to mark brainliest!!!

Physics

1 answer:

julsineya [31]3 years ago

7 0

Answer:

4.71m/s

Explanation:

Given parameters:

Distance covered = 40.5m

Time taken = 8.6s

Unknown:

Speed = ?

Solution:

The speed of Samantha is the distance divided by the time taken.

Speed = $\frac{Distance}{time}$

Now insert the parameters;

Speed = $\frac{40.5}{8.6}$ = 4.71m/s

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A boat of mass 250 kg is coasting, with its engine in neutral, through the water at speed 1.00 m/s when it starts to rain with i

bija089 [108]

Answer:

$v_o\approx0.7059\ m.s^{-1}$

Explanation:

Given:

mass of the boat, $m=120\ kg$

uniform speed of the boat, $v=1\ m.s^{-1}$

rate of accumulation of water mass in the boat, $\dot m=100\ kg.hr^{-1}$

time of observation, $t=0.5\ hr$

The mass of the boat after the observed time:

$m_o=m+\dot m\times t$

$m_o=120+100\times 0.5$

$m_o=170\ kg$

Now using the conservation of momentum:

$m.v=m_o.v_o$

$120\times 1=170\times v_o$

$v_o\approx0.7059\ m.s^{-1}$

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3 years ago

Define power and describe how to determine power. (4 points)

Allushta [10]

Answer: The power is a measure of the rate at which work is done (or similarly, at which energy is transferred). The standard unit of power is Watt (1W). The power is determined by the change in energy, delta E (number of joules) and delta t, which is the time taken in seconds then: P= delta E/ delta t.

Mark me as Brainliest

Explanation:

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4 years ago

Hair can be used to measure humidity. a. True b. False

Rainbow [258]

A. True.

You can make a hygrometer using strands of hair.

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3 years ago

How to show your work for 0.04% of 245

Harlamova29_29 [7]

0.04*245 is the work