4 years ago

Select three standard units of the metric system.

Physics

1 answer:

dolphi86 [110]4 years ago

8 0

Centimeter, meter, liter

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How fast, in meters per second, does an observer need to approach a stationary sound source in order to observe a 1.6 % increase

morpeh [17]

Answer:

The value is $v_o = 5.488 \ m/s$

Explanation:

From the question we are told that

The emitted frequency increased by $\Delta f = 1.6 \% = 0.016 \$

Let assume that the initial value of the emitted frequency is

$f = 100\% = 1$

Hence new frequency will be $f_n = 1 + 0.016 = 1.016$

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$f_1 = [\frac{ v \pm v_o}{v \pm + v_s } ] f$

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$v_s$ is the velocity of the sound source which is $v_s = 0 \ m/s$ because it started from rest

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$f_1 = [\frac{ v + v_o}{v + 0 } ] f$

=> $1.016 = [\frac{ 343 + v_o}{343 } ] * 1$

=> $v_o = 5.488 \ m/s$

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3 years ago

It takes 40 J of energy to push a large box 4m across a floor. Assuming the push is the same direction as the movement, what is

Jobisdone [24]

Answer:

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Equation to use: W=|F|*|d|*cosθ

Your unknown is the force F; You have one equation, oneunknown.

40j=(F)*(4m)*cos(0)

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3 years ago

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3 years ago

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3 years ago