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3 years ago

Which set of terms best decribes what affect kinetic energy and potential energy respectively

Physics

1 answer:

blsea [12.9K]3 years ago

5 0

Velocity and height are the terms that best describes what affects kinetic energy and potential energy.

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A skydiver will reach a terminal velocity when the air drag equals their weight. For a skydiver with high speed and a large body

Andrej [43]

Answer with Explanation:

It is given that

1) Force of Drag $F_{D}=\frac{1}{2}\rho Av^{2}$

2) Weight $W=mg$

Equating drag and weight we get

$F_{D}=W\\\\\frac{1}{2}\rho Av^{2}=mg\\\\v^{2}=\frac{2mg}{\rho A}\\\\\therefore v=\sqrt{\frac{2mg}{\rho _{air}A}}$

where,

'm' is mass of the object

'g' is acceleration due to gravity

'A' is the area of the person

$\rho _{air}$ is the density of air

Approximating the weight of a man to be 75 kg and area of man $0.8m^{2}$

Applying the values in the formula we get

$v=\sqrt{\frac{2\times 75\times 9.81}{1.225\times 0.8}}$

$\therefore v=38.75m/s$

6 0

3 years ago

A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released?

hichkok12 [17]

Answer:

$v = 31.6m/s$

Explanation:

Given

$Initial\ Velocity, u = 12m/s$

$Time, t = 2.0s$

Required

Determine the final velocity, v

Using the first equation of motion

$v = u + at$

But in this case;

a = g = acceleration of gravity

So:

$v = u + gt$

Substitute values for u and t

$v = 12 + g * 2$

$v = 12 + 2g$

Take g as 9.8m/s²

$v = 12 + 2 * 9.8$

$v = 12 + 19.6$

$v = 31.6m/s$

<em>Hence, the velocity is 31.6m/s</em>

3 0

4 years ago

A typical ultrasound transducer used for medical diagnosis produces a beam of ultrasound with a frequency of 1.0 MHz. The beam t

serg [7]

frequency of the ultrasound given as

$f = 1.0 MHz$

speed of the wave is

$v = 1540 m/s$

Now the wavelength is given as

$wavelength = \frac{speed}{frequency}$

$\lambda = \frac{1540}{1\times 10^6}$

$\lambda = 1.5 mm$

now we know that distance between two consecutive antinodes is always half of wavelength

so we have

d = 0.75 mm

3 0

4 years ago

Two or more velocities add by ____?<br><br> Plz help

VladimirAG [237]

By vector addition.
In fact, velocity is a vector, with a magnitude intensity, a direction and a verse, so we can't simply do an algebraic sum of the two (or more velocities).
First we need to decompose each velocity on both x- and y-axis (if we are on a 2D-plane), then we should do the algebraic sum of all the components on the x- axis and of all the components on the y-axis, to find the resultants on x- and y-axis. And finally, the magnitude of the resultant will be given by
$R= \sqrt{(R_x)^2+(R_y)^2}$
where Rx and Rx are the resultants on x- and y-axis. The direction of the resultant will be given by
$\tan \alpha = \frac{R_y}{R_x}$
where $\alpha$ is its direction with respect to the x-axis.