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3 years ago

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

Physics

1 answer:

AfilCa [17]3 years ago

7 0

I think it fb I’m not really sure

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54 km/h is equal to

pogonyaev

$\Huge{\underline{\underline{\mathfrak{\green{AnsWeR:}}}}}$

1 km/h = 5/18 m/s

54 km/h = 54×5/18 m/s

7 0

3 years ago

A sheet of gold foil has a volume of 0.750 cm3. If the foil measures 50.0cm by 10.0cm, what is the thickness of the foil?

vlada-n [284]

To calculate the thickness of foil, we use formula of volume as

$V= l w t$

Here, l is the length of the foil, w is the width of the foil and t is the thickness of the foil.

Given, $V = 0.750 \ cm^3$ , $l = 50 cm$ and $w = 10 \ cm$ .

Substituting theses values in above equation, we get

$0.750 \ cm^3 = 50 cm \times 10 \ cm \times t \\\\ t = 0.0015 cm$

Thus, the thickness of the foil is 0.0015 cm.

6 0

3 years ago

A grasshopper hops along a level road. on each hop, the grasshopper launches itself itself at an angle of 45 degrees. and achiev

Harman [31]

Answer: 1.9 m/s

Explanation:

1) Data:

height, y = 0

range, x = 0.77m

angle, α = 45°

question, horizontal velocity, Vox = ?

2) Physical principles and formulas

Projectile motion.

$y=V_{0y}t-gt^{2} /2\\ \\ x=V_{0x}t\\ \\ V_{0y}=V_0sin\alpha \\ \\ V_{0x}=V_0cos\alpha$

3) Solution

$0.77=V_0cos(45)t\\ t=0.77/(V_0cos(45))$

$y=0=V_0sin(45)t-gt^{2} /2$

Factor

$0=t[V_0sin(45)-gt/2]$

Discard t = 0 and solve for the other factor:

$gt/2=V_0sin(45)\\ \\ V_0= gt/(2sin(45))=9.81[0.77/V_{0}cos(45)]/[2sin(45)]\\ \\ V_0^2=9.81[0.77/(2cos(45)sin(45)=9.81[0.77/sin(90)]=7.55\\ \\ V_0}=\sqrt{7.55} =2.8$

Find Vx:

$Vx=V_{0x}=V_{0}cos(45)=2.75(\sqrt{2} /2]=1.9$

Vx = 1.9m/s ← answer

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3 years ago

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In one scene in the movie The Godfather II, a solid gold phone is passed around a large table for everyone to see. Suppose the v

Lina20 [59]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

the weight of the phone? 1 kg of mass is about 2.2 lb. is no. 3 which is "<span>No; it weighs about 45 lbs."</span>

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3 years ago

Explain how a truss bridge is so stable.

Fittoniya [83]

Answer:

Truss bridge, bridge with its load-bearing structures composed of a series of wooden or metal triangles, known as trusses. Given that a triangle cannot be distorted by stress, a truss gives a stable form capable of supporting considerable external loads over a large span.

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3 years ago

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