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3 years ago

A tennis ball launcher works by using a spring to

Physics

1 answer:

sladkih [1.3K]3 years ago

4 0

Answer:

3MN/m

Explanation:

Step one:

given data

Kinetic Energy KE=15,000J

mass m= 0.5kg

compression x= 0.1m

Step two:

The expression for the energy stored in spring is

$KE= 1/2ke^2\\\\15000=1/2 *k*0.1^2\\\\15000=1/2*k*0.01\\\\15000=0.005k\\\\$

divide both sides by

0.005

$k= 15000/0.005\\\\k=3000000\\\\k= 3MN/m$

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How energy is converted from one form to other

blagie [28]

Explanation:

Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. ... Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.

8 0

3 years ago

Read 2 more answers

Im confused on how to do this

Grace [21]

Explanation :

(1) No. of jumping jacks, $n=120$

time, $t=6\ minutes=360\ sec$

So, frequency is $f=\dfrac{n}{t}$

$f=\dfrac{120}{360\ sec}$

$f=0.33 Hz$

(2) The quarter spins 10 times every seconds

So, frequency $f=10\ Hz$

and the period of one cycle is, $t=\dfrac{1}{10\ Hz}$

$t=0.1\ sec$

(3) mass of block, $m=1.3\ Kg$

force constant of spring, $K=250\ N/m$

Time period of oscillations is given by :

$T=2\pi \sqrt{\dfrac{m}{k}}$

$T=2\pi \sqrt{\dfrac{1.3\ Kg}{250\ N/m}}$

So, $T=0.45\ sec$

Frequency, $F=\dfrac{1}{time\ period}$

$F=\dfrac{1}{0.45\ sec}$

$F=2.22\ Hz$

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3 years ago

How does the respiratory system interact with the circulatory system?

galben [10]

Answer:

D. The circulatory system transports oxygen that the respiratory system brings into the body.

Explanation:

the first two answers either refer to carbon dioxide as beneficial and necessary to the body(it sometimes is but not in this case)

the answer choice c refers to oxygen being transferred directly to the heart. This is also incorrect.

the only proper answer to this question is answer choice d.

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4 years ago

A piano wire with mass 2.95 g and length 79.0 cm is stretched with a tension of 29.0 N . A wave with frequency 105 Hz and amplit

Romashka-Z-Leto [24]

The concept needed to solve this problem is average power dissipated by a wave on a string. This expression ca be defined as

$P = \frac{1}{2} \mu \omega^2 A^2 v$

Here,

$\mu$ = Linear mass density of the string

$\omega =$ Angular frequency of the wave on the string

A = Amplitude of the wave

v = Speed of the wave

At the same time each of this terms have its own definition, i.e,

$v = \sqrt{\frac{T}{\mu}} \rightarrow$ Here T is the Period

For the linear mass density we have that

$\mu = \frac{m}{l}$

And the angular frequency can be written as

$\omega = 2\pi f$

Replacing this terms and the first equation we have that

$P = \frac{1}{2} (\frac{m}{l})(2\pi f)^2 A^2(\sqrt{\frac{T}{\mu}})$

$P = \frac{1}{2} (\frac{m}{l})(2\pi f)^2 A^2 (\sqrt{\frac{T}{m/l}})$

$P = 2\pi^2 f^2A^2(\sqrt{T(m/l)})$

PART A ) Replacing our values here we have that

$P = 2\pi^2 (105)^2(1.8*10^{-3})^2(\sqrt{(29.0)(2.95*10^{-3}/0.79)})$

$P = 0.2320W$

PART B) The new amplitude A' that is half ot the wavelength of the wave is

$A' = \frac{1.8*10^{-3}}{2}$

$A' = 0.9*10^{-3}$

Replacing at the equation of power we have that

$P = 2\pi^2 (105)^2(0.9*10^{-3})^2(\sqrt{(29.0)(2.95*10^{-3}/0.79)})$

$P = 0.058W$

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3 years ago

The islands of Java and Sumatra in Indonesia are an example of A. a rift zone B.a hot spot C. an ocean ridge D. a volcanic islan

marissa [1.9K]

The correct answer is D.

6 0

4 years ago