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12345 [234]
3 years ago
9

Why should a chemical equation be balanced? A. to show ionic compounds B. to show metals from nonmetals C. to show the law of co

nservation of mass D. to show that the reactants are compounds
Physics
1 answer:
yKpoI14uk [10]3 years ago
3 0

Answer:

b

Explanation:

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In a mattress test, you drop a 7.0 kg bowling ball from a height of 1.5 m above a mattress, which as a result compresses 15 cm a
Assoli18 [71]

Answer:

(c) 10.29 J

(d) 113.19 J

(e) 113.19 J

(f) 10061 N/m

Explanation:

15 cm = 0.15 m

Let g = 9.8 m/s2

(c) The work done by gravitational force is the product of gravity force and the distance compressed

E_p = mgx = 7*9.8*0.15 = 10.29 J

(d) By using law of energy conservation with potential energy reference being 0 at the maximum compression point. As the ball falls and come to a stop at the compression point, its potential energy is transferred to elastic energy, which is the work that the mattress does on the ball:

E_p = E_e

E_e = mgh

where h = 1.5 + 0.15 = 1.65 m is the vertical distance that it falls.

E_e = 7*9.8*1.65 = 113.19 J

(e) Before the compression, the potential energy of the mattress is 0. After the compression, the potential energy is 113.19J. So it has increased by 113.19J due to the potential energy transferred from the falling ball.

(f) E_e = 113.19 = kx^2/2

k0.15^2/2 = 113.19

k = 10061 N/m

8 0
3 years ago
Read 2 more answers
A train rolls past a stationary observer. To him, the train is moving at a speed of 23m/s west, and a woman on the train is movi
GREYUIT [131]

Answer:

21.7 seconds.

Explanation:

Woman's velocity relative to train (23 m/s - 22.4 m/s) = 0.6 m/s

Distance woman wants to travel = 13m

To find how long she will take to move 13m relative to the train, take the distance she wants to travel divided by her velocity relative to the train.

(13m)/(0.6 m/s) = 21.6667 seconds or 21.7 seconds.  

Therefore, it will take the woman 21.7 seconds to move 13m.

4 0
3 years ago
13. A nuclear decay chain represents
murzikaleks [220]

Answer:

a series of  decays producing sequentially more stable nuclei

Explanation:

A nuclear decay chain represents a series of decays producing sequentially more stable nuclei.

  • For every atomic nucleus, there is a specific neutron/proton ratio which ensures the stability of the nucleus.
  • Any nucleus with a neutron/proton combination different from its stability ratio (i.e either too many neutrons or too many protons) will be unstable and split into one or more other nuclei with the attendant emission of small particles of matter.
  • The decay process is a continuous chain reaction steps.
  • Until stability of the nucleus is attain, it continues.
5 0
4 years ago
Help please I’ll mark as brainliest
kirza4 [7]

Answer:

yes

Explanation:

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A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward
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I think th<span>e upward acceleration of the rocket during the burn phase is 7.</span>8 m/s2
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