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3 years ago

How often would you push someone on a swing to create a frequency of .4 hertz

1 answer:

4 0

The unit "Hertz" means "per second".

Anything happening with a frequency of 0.4 Hz is happening 0.4 per second.

Technically, you must push the swing 0.4 times per second.
But since it's very hard to push 0.4 of one time, you have to be
able to figure out that you should push once every 2.5 seconds.

(1 push / 2.5 sec) = (1/2.5) push/sec = 0.4 per sec = 0.4 Hz .

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The driver of a 1750 kg car traveling on a horizontal road at 110 km/h suddenly applies the brakes. Due to a slippery pavement,

Alexeev081 [22]

Answer: a=-2.4525 m/s^2

d=s=190.3 m

Explanation:The only force that is stopping the car and causing deceleration is the frictional force Fr

Fr = 25% of weight

W=mg

W=1750*9.81

W=17167.5

Hence

$Fr=\frac{25}{100} * -17167.5\\\\Fr=-4291.875 N$

Frictional force is negative as it acts in opposite direction

According to newton second law of motion

F=ma

hence

$a=Fr/m$

$a=-4291.875/1750\\a=-2.4525$

given

u= 110 km/h

u=110*1000/3600

u=30.55 m/s

to get t we know that final velocity v=0

$v^2=u^2+2as\\0=30.55^2-2*2.4525*s\\s=190.34m$

3 0

3 years ago

Radio Waves If your favorite FM radio station broadcasts at a frequency of 104.5 MHz, what is the wavelength of the station’s si

kompoz [17]

Answer:

The wavelength of the station’s signal is 2.9 meters

The energy of a photon of the station’s electromagnetic signal is $6.9\times10^{-26}J$

Explanation:

Wavelength $\lambda$ is inversely proprtional to frequency (f) and directly proportional to velocity of the wave (v).

$\lambda=\frac{v}{f}$ (1)

But electromagnetic waves as radio signals travel at speed of light so using this on (1):

$\lambda=\frac{c}{f}=\frac{3.0\times10^{8}}{104.5\times10^{6}}\approx2.9\,m$

Albert Einstein discovered that energy of electromagnetic waves was quantized in small discrete packages of energy called photons with energy:

$E=hf=(6.6\times10^{-34})(104.5\times10^{6})\approx6.9\times10^{-26}J$

with h the Planck's constant.

6 0

3 years ago

Consider the following statements. A. Heat flows from an object at higher temperature to an object at lower temperature; B. Heat

IgorC [24]

Only ' A ' is always true.<em> (choice-1)</em>

' B ' is not true when you drop a red hot spoon into cold soup.

' C ' is not true when you drop a red hot marble into a cool swimming pool.

8 0

3 years ago

Object A has a mass of 8.0 kg and is accelerating at 4.0 m/s2. Object B has a mass of 10.0 kg and is accelerating at 3.0 m/s2. O

Leviafan [203]

Answer:

b. B, A, C

Explanation:

To solve this problem, let us find the net forces they are experiencing.

Net force = mass x acceleration

Object A; mass = 8kg and acceleration = 4m/s²

Net force = 8 x 4 = 32N

Object B; mass = 10kg and acceleration = 3m/s²

Net force = 10 x 3 = 30N

Object C: mass = 7kg and acceleration = 5m/s²

Net force = 7 x 5 = 35N

So, increasing order of their net force;

B < A < C

6 0

3 years ago

When you rub two balloons on your sleeve, does it have positive or negative?

igomit [66]

When you rub the balloons, it will take electrons away, which is negative. So, the balloons are negative

6 0

3 years ago

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