2 years ago

Which of the following is NOT proof of a chemical change

Physics

2 answers:

Blababa [14]2 years ago

4 0

Answer:

Explanation:

all are proof Eeeeeeeeeee

Zinaida [17]2 years ago

4 0

Answer:

E. ALL ARE PROOF

Explanation:

these are all examples of chemical changes

You might be interested in

The total mass of an object can be assumed to be focused at one point, which is called its center of _______. A. force B. veloci

QveST [7]

C.) <span>The total mass of an object can be assumed to be focused at one point, which is called its center of "Mass"

Hope this helps!</span>

4 0

2 years ago

Read 2 more answers

A circular sign has a diameter of 40 cm and is subjected to normal winds up to 150 km/h at 10°C and 100 kPa. Determine the drag

Marat540 [252]

Answer:

147.7 N

221.55 Nm

Explanation:

P = Pressure = 100000 Pa

$R_s$ = Mass-specific gas constant = 287.015 J/kg k

T = Temperature = 10+273 = 283 K

C = Drag coefficient = 1.1

A = Area

r = Radius = 0.2 m

v = Speed of wind = $\frac{150}{3.6}\ m/s$

L = Length of pole

Density

$\rho=\frac{P}{R_sT}\\\Rightarrow \rho=\frac{100000}{287.058\times 283}\\\Rightarrow \rho=1.2309\ kg/m^3$

Drag force

$F=\frac{1}{2}\rho CAv^2\\\Rightarrow F=\frac{1}{2}\times 1.2309\times 1.1\times \left(\pi \times 0.2^2\right)\times \left(\frac{150}{3.6}\right)^2\\\Rightarrow F=147.7\ N$

Force on the circular sign is 147.7 N

$M=F\times L\\\Rightarrow M=147.7\times 1.5\\\Rightarrow M=221.55\ Nm$

Bending moment at the bottom of the pole is 221.55 Nm

6 0

3 years ago

Why are collisions between galaxies more likely than collisions between stars within a galaxy?

KatRina [158]

Answer:

stars share a gravitational force with the galaxy while nearby galaxies do not share a gravitational field.

Explanation:

stars will not collide because they are bound by a gravitational orbit around the galaxy

8 0

2 years ago

13. Which statement correctly describes the human heart? A. It has three chambers, and pumps blood directly into veins. B. It ha

Marta_Voda [28]

Number 13 is D the heart has 4 chambers and pumps blood to the arteries and number 14 us C

8 0

2 years ago

Read 2 more answers

Calculate the net force being applied to the objects. Include SIZE and DIRECTION.

guajiro [1.7K]

Juice WRLD 999 ,........................

3 0

2 years ago