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slava [35]
3 years ago
15

A child sits on top of a slide at the park. He pushes forward lightly, but does not go down the slide. Pick the sentence that

Chemistry
1 answer:
Vinvika [58]3 years ago
4 0

Answer:

The net force on the child is zero

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Electromagnetic waves are used in many technological devices. Describe two examples of how energy from electromagnetic waves is
kykrilka [37]

Answer:

Electromagnetic waves are ubiquitous in nature (i.e., light) and used in modern technology—AM and FM radio, cordless and cellular phones, garage door openers, wireless networks, radar, microwave ovens, etc. These and many more such devices use electromagnetic waves to transmit data and signals.

Explanation:

i mean there's alot of stuff that have Electromagnetic waves in it i mean alot!

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3 years ago
“Some types of vaccines need only one shot to protect you for the rest of your life. Other types, such as the one for seasonal f
IrinaK [193]
Yearly, is the answer.
8 0
3 years ago
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The density of gold is 19.3 g/cm3. What is the volume of a 575 gram bar of pure gold?
Gnoma [55]

Answer:

The  answer to your question is: Volume = 29.79 cm³

Explanation:

Data

Density of gold = 19.3 g/cm3

Mass = 575 grams

Formula

density = mass / volume

Volume = mass/density

Volume = 575 g / 19.3 g/cm3

Volume = 29.79 cm³

3 0
3 years ago
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What is the threshold frequency ν0 of cesium?
Montano1993 [528]
 I think this is what you're after:

 Cs(g) → Cs^+ + e⁻ ΔHIP = 375.7 kJ mol^-1 [1] 


Convert to J and divide by the Avogadro Const to give E in J per photon 


E = 375700/6.022×10^23 = 6.239×10^-19 J 


Plank relationship E = h×ν E in J ν = frequency (Hz s-1) 


Planck constant h = 6.626×10^-34 J s 


6.239×10^-19 = (6.626×10^-34)ν 


ν = 9.42×10^14 s^-1 (Hz) 


IP are usually given in ev Cs 3.894 eV 


<span>E = 3.894×1.60×10^-19 = 6.230×10^-19 J per photon </span>

4 0
3 years ago
What is the difference between mass and weight?
Olin [163]

Explanation:

The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s2.

7 0
3 years ago
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