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nekit [7.7K]
3 years ago
11

I really need help!!

Physics
2 answers:
pishuonlain [190]3 years ago
4 0
-- Ice melts and becomes liquid when its temperature reaches 32°F.
The "warm and sunny day" is certainly warmer than that.

-- Table salt melts and becomes liquid when its temperature reaches 1474°F.
I'm pretty sure the day is not THAT warm and sunny.
Mars2501 [29]3 years ago
3 0
Omg! i just answered this <em>exact same</em> question last year!!! the salt doesnt melt cuz it is an ionic compound, which needs large amounts of energy to melt. it is simply sunny and warm outside, so it doesnt melt. hope i answered your question! ;)
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A 560-g squirrel with a surface area of 930cm2 falls from a 5.0-m tree to the ground. Estimate its terminal velocity. (Use a dra
bija089 [108]

Explanation:

Terminal velocity is given by:

v_t=\sqrt{\frac{2mg}{\rho C_dA}}

Here, m is the mass of the falling object, g is the gravitational acceleration,  C_d is the drag coefficient, \rho is the fluid density through which the object is falling, and A is the projected area of the object. in this case the projected area is given by:

A=\frac{A_s}{2}=\frac{930cm^2}{2}=465cm^2\\465cm^2*\frac{1m^2}{10^4cm^2}=0.0465m^2\\560g*\frac{1kg}{10^3g}=0.56kg

Recall that drag coefficient for a horizontal skydiver is equal to 1 and air density is 1.28\frac{kg}{m^3}.

v_t=\sqrt{\frac{2(0.56kg)(9.8\frac{m}{s^2})}{(1.28\frac{kg}{m^3}(1)(0.0465m^2)}}\\v_t=13.58\frac{m}{s}

Without drag contribution the motion of the person is an uniformly accelerated motion, thus:

v_f^2=v_o^2+2gh\\v_f=\sqrt{2gh}\\v_f=\sqrt{2(9.8\frac{m}{s^2})(5m)}\\v_f=9.9\frac{m}{s}

7 0
3 years ago
Sound can travel through a medium, but it does not require a medium.<br> a. True.<br> b. False
attashe74 [19]

That's false.  No medium = no sound.
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The distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists u
vampirchik [111]

Answer:

D

Explanation:

D

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A ball is kicked at an angle of 35 degrees with the ground. What should be the initial velocity of the ball so that it hits a ta
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18.5 M/S

Explanation:

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Work is the ability to cause what?
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Work is the ability to cause life change??
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