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2 years ago

50 POINTS!!!!!

Physics

2 answers:

FinnZ [79.3K]2 years ago

8 0

Answer:

The answer is C.move forward rapidly until stopped.

Explanation:

50 miles an hour is a very high speed. The momentum transfer to the car at stop light will move the car forward rapidly until its brake is able to stop it.

n200080 [17]2 years ago

4 0

Answer:

Explanation:

law of conservation of momentum says the car that u hit will move forward rapidly. then it wuld stop. ans is C

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On your drive home from school, you travel 1200 m in 80 s, then 400 min 20 s.

Mama L [17]

Average speed = Total distance/total time taken

$= \frac{1200 + 400}{80 + 20}$

$= \frac{1600}{100}$

$= \frac{16}{1}$

$= 16 \: ms {}^{ - 1}$

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3 years ago

Radiation emitted from human skin reaches its peak at λ = 960 µm. what is the frequency of this radiation? planck's constant is

Artist 52 [7]

1) The wavelength of the radiation emitted by the human skin is
$\lambda=960 \mu m = 960 \cdot 10^{-6} m$
the frequency of the radiation is related to the wavelength by
$f= \frac{c}{\lambda}$
where $c=3 \cdot 10^8 m/s$ is the speed of light. Plugging numbers into the formula, we find the frequency of the radiation:
$f= \frac{3 \cdot 10^8 m/s}{960 \cdot 10^{-6}m}=3.13 \cdot 10^{11} Hz$

2) The frequency of this radiation is 313 GHz, and its wavelength $960 \mu m$ . If we look at the table of the electromagnetic spectrum
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
We see that we are in the range of visible light (in particular, in the infrared range).
Therefore, the correct answer is <span>2. visible light .</span>

6 0

3 years ago

How much potassium nitrate (KNO3) would dissolve in 50 milliliters of water at 45ºC given that 55g of KNO3 is dissolved in 150mL

OLEGan [10]

The answer is C. 18.3g

8 0

3 years ago

Please what is the work done by a man who is pulling a box of 45kg of mass by means of rope which makes angle of 45 degrees ?

Tpy6a [65]

Answer:

No work is done since no distance is given

Explanation:

Since no distance is given, the force is not doing any work

No work is done by the man since we do not know the distance or displacement.

Work is only said to be done when the force applied on an object moves it through a particular distance.

Work done = Force x distance.

Since no distance is given in this problem, we can as well assume that the force applied is doing no work on the object.

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2 years ago

The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in bu

Verdich [7]

Answer:

Explanation:

v = I / (n q A)

where A is the cross sectional area (you are given diameter, so A = (pi/4) * d^2), n is the number of charge carriers in a volume, and q is the charge of each carrier (-1.60x10^-19). I is the current, in Amps.

You will need to either convert your diameter from inches to centimeters or you will need to convert your volume in cc to cubic inches. I'd convert diameter.

5 0

3 years ago