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3 years ago

What does velocity tell about movement

Physics

2 answers:

alina1380 [7]3 years ago

8 0

Velocity is object's movement but it has direction because it's a vector!

Kaylis [27]3 years ago

3 0

<span>Velocity tells you what speed a moving object travels at and in what direction.</span>

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Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a frequency of 288 Hz and

mart [117]

Answer:

5.03 m

Explanation:

The wavelength of a wave is given by

$\lambda=\frac{v}{f}$

where

v is the speed of the wave

f is the frequency of the wave

For the sonar signal in this problem,

$f=288 Hz$

$v=1.45\cdot 10^3 m/s$

Substituting into the equation, we find the wavelength:

$\lambda=\frac{1.45\cdot 10^3 m/s}{288 Hz}=5.03 m$

3 0

4 years ago

What is 3.75 x 10^-7?

pogonyaev

Answer:

Explanation:

3.75 * 10^-7

=3.75 * 1/10^7

=3.75/10000000

=3/800000000

any base which has it's power negative do it's reciprocal then the power will be positive.

8 0

3 years ago

A 1250 kg Nascar is at the starting line. The race starts and the car reaches a speed of 30

lana66690 [7]

Answer:

force=1250kg * 30m/s+10

Explanation: it's a change in acceleration

6 0

3 years ago

An exothermic reaction is defined as a reaction that _____.

andreev551 [17]

ANSWER: B

Exothermic always RELEASES heat, energy, or light

Endothermic TAKES IN/ ABSORBS heat, energy, or light

8 0

4 years ago

What is the entropy change of a 0.349 g spoonful of water that evaporates completely on a hot plate whose temperature is slightl

quester [9]

Answer:

$\Delta S = 2.11 J/K$

Explanation:

As we know that entropy change for phase conversion is given as

$\Delta S = \frac{\Delta Q}{T}$

Here we know that heat required to change the phase of the water is given as

$\Delta Q = mL$

here we have

$m = 0.349 g = 3.49\times 10^{-4} kg$

L = 2250000 J/kg

now we have

$\Delta Q = (3.49 \times 10^{-4})\times 2250000$

$\Delta Q = 788.9 J$

also we know that temperature is approximately same as boiling temperature

so we have

$T = 373 k$

so here we have

$\Delta S = \frac{788.9}{373}$

$\Delta S = 2.11 J/K$

3 0

3 years ago