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Alja [10]
3 years ago
14

Please I really need this !! Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this

reaction?
A. It reduces.
B. It undergoes synthesis.
C. It undergoes redox.
D. It oxidizes​
Physics
2 answers:
katrin [286]3 years ago
8 0
D. It oxidises /////
Anna11 [10]3 years ago
7 0
<h2>Answer:</h2>

[D] It oxidizes.

4K + O2 → 2K2O, <u>potassium oxide</u> is produce.

We have the equation, in which when <u>potassium</u> react with <u>oxygen</u>, as a product it formed <u>Potassium oxide</u> which means <u>adding of oxygen</u> (<u>oxidation</u>).

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A ball whose mass is 0.3 kg hits the floor with a speed of 5 m/s and rebounds upward with a speed of 2 m/s. If the ball was in c
Sonbull [250]

Answer:

1400 N

Explanation:

Change in momentum equals impulse which is a product of force and time

Change in momentum is given by m(v-u)

Equating this to impulse formula then

m(v-u)=Ft

Making F the subject of the formula then

F=\frac {m(v-u)}{t}

Take upward direction as positive then downwards is negative

Substituting m with 0.3 kg, v with 2 m/s, and u with -5 m/s and t with 0.0015 s then

F=\frac {0.3(2--5)}{0.0015}=1400N

4 0
3 years ago
"A 2000 kg car drives around a circular exit ramp with a radius of 30 meters. The car drives all the way around the ramp in 10 s
aev [14]

The speed of the car is 18.8 m/s

Explanation:

The variables that represent the givens are:

m = 2000 kg (mass of the car)

r = 30 m (radius of the curve)

t = 10 s (time elapsed to cover the curve)

The unknown is the speed of the car, which is given by:

v=\frac{d}{t}

where d is the distance covered by the car during the time t.

Here the car covers a circular trajectory of radius r, so the distance covered is

d=2\pi r=2\pi(30)=188m

Therefore, the speed of the car is

v=\frac{188}{10}=18.8 m/s

Learn more about circular motion:

brainly.com/question/2562955

brainly.com/question/6372960

#LearnwithBrainly

8 0
3 years ago
What does the difference in force depend upon?
bija089 [108]

The magnetic force on a moving charge, depends on three four things: the magnitude of the charge, the velocity of the charge, the strength of the magnetic field, and the angle between the velocity and the magnetic field.


6 0
3 years ago
An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at 12.8 m/s2 . At t1 the rocket e
Simora [160]

Answer:4.39 s

Explanation:

Given

initial velocity u=0

acceleration a=12.8 m/s^2

velocity acquired by sled in t_1 time

v=0+at

v=12.8t_1

distance traveled by sled in t_1 s

v^2-u^2=2as

(12.8t_1)^2-0=2\times 12.8\times s_1

s_1=6.4\cdot t_1^2

distance traveled in t_2 time with velocity v=12.8t_1

s_2=v\times t_2

s_2=12.8\times t_1\times t_2

s_2=12.8\cdot t_1\cdot t_2

s_1+s_2=5.37\times 10^3

6.4t_1^2+12.8t_1t_2=5370----1

t_1+t_2=97.7 s

t_2=97.7-t_1

substitute the value of t_2 in 1

we get

6.4t_1^2-1250.56t_1+5370=0

thus t_1=\frac{1250.56-1194.33}{12.8}=4.39 s

t_1=4.39 s

5 0
4 years ago
Please answer! Need TOMMORROW!!!!! Thank you giving the most points to first and correct answers
irinina [24]
23. I think is. B.is suitable to be processed and used again
6 0
3 years ago
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