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2 years ago

What is chemical change ??

Physics

2 answers:

IgorC [24]2 years ago

7 0

Answer:

the combination,decomposition or replacement that occurs in the molecules of matter during chemical change called chemical reaction

givi [52]2 years ago

5 0

Answer:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. ... A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.

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Oduvanchick [21]

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Add them together then divide by three because there are three numbers

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3 years ago

An archer fires and arrow while standing atop a 5.15 m tall wall. The arrow is fired at an angle of 55 degrees and has a launch

il63 [147K]

Answer:

Explanation:

Given

height of wall=5.15 m

angle of launch $(\theta )=55^{\circ}$

Launch velocity(u)=52.4 m/s

Time of flight will be sum of time of flight of projectile+time to cover 5.15 m

Time of flight of arrow $=\frac{2usin\theta }{g}$

$t=\frac{2\times 52.4\times sin55}{9.81}=8.76 s$

Now time require to cover 5.15 m

Here at the time of zero vertical displacement of arrow i.e. when arrow is at the same height as of building then its vertical velocity will change its sign compared to initial vertical velocity.

$v_y=-52.4sin55$ at zero vertical displacement

Thus time required will be $t_2$

$5.15=52.4sin55\times t+\frac{gt^2}{2}$

$4.9t^2+42.92t-5.15=0$

$t=0.118 s i.e. t_2=0.118 s$

total time = $t_1+t_2=8.76+0.118=8.878 s$

(b)Horizontal distance=Range of arrow(R_1) + horizontal distance in 0.118 s $(R_2)$

$R_1=\frac{u^2sin2\theta }{g}=\frac{52.4^2\times sin110}{9.8}=263.28 m$

$R_2=52.4cos55 \times 0.118=3.546 m$

$R=R_1+R_2$ =263.28+3.546=266.82 m

8 0

3 years ago

6. If a car went a distance of 225 kilometers in 4

denis23 [38]

Answer:

56.25

Explanation:

225/4=56.25

3 0

3 years ago

Compared to that of a plane on the ground, Earth’s gravitational pull on a plane 7 miles above Earth is approximately A) zero. B

NeTakaya

I am proply right that it is B

7 0

3 years ago

Read 2 more answers

If you are building a clock by using a pendulum's oscillations to keep time and you find the period is a little too small (the c

Leviafan [203]

Time period of pendulum is given by

$T = 2\pi\sqrt{\frac{L}{g}}$

Here,

L is length

g is acceleration due to gravity

Therefore we can determine that the period of the pendulum is directly proportional to the square root of the length of the rope.

$T \propto \sqrt{L}$

Therefore, it is necessary to increase the length of the rope to increase the period so that it counts the seconds more slowly. The correct answer is A.

3 0

3 years ago

What is chemical change ??​

What is chemical change ??