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Bond [772]
3 years ago
12

Which statement is completely accurate?

Physics
2 answers:
zepelin [54]3 years ago
7 0
The correct answer is D. Atoms of the same element can have different number of neutrons.
Rainbow [258]3 years ago
3 0
Elements are identified by their atoms' number of protons. So different neutron amounts will not affect the identity of the atom.

For example, a Hydrogen atom has only 1 proton and no neutrons (H¹). If you add a neutron and make it 1 proton and 1 neutron (H²), it will still be a Hydrogen but just a different isotope which is called Deuterium.

Thus, the answer is D



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Not all forms of radiation is safe for humans
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3 years ago
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A car speeds past a stationary police officer while traveling 135 km/h. the officer immediately begins pursuit at a constant acc
kykrilka [37]

(a) The time it takes for the police officer to catch up to the speeding car is determined as 0.31 s.

(b) The speed of the police officer  at the time he catches up to the driver is 136.8 km/h.

<h3>Time of motion of the police</h3>

The time taken for the police to catch up with the driver is calculated as follows;

v = at

where;

  • a is acceleration = 11.8 km/h/s, = 3.278 m/s²
  • v is velocity = 135 km/h = 37.5 m/s

t = v/a

t = 37.5/3.278

t = 11.4 seconds

(v1 - v2)t = ¹/₂at² --- (1)

(v1 - v2)t = v1²/2a --- (2)

From (1):

(v1 - 37.5)t = ¹/₂(3.278)t²

(v1 - 37.5)t = 1.639t²

v1 - 37.5 = 1.639t

v1 = 1.639t + 37.5  -----(3)

From (2):

(v1 - 37.5)t = v1²/(2 x 3.278)

(v1 - 37.5)t = 0.153 ----- (4)

solve 3 and 4;

(1.639t + 37.5 - 37.5)t = 0.153

1.639t² = 0.153

t² = 0.0933

t = 0.31 s

<h3>Speed of the police officer</h3>

v1 = 1.639(0.31) + 37.5 = 38 m/s = 136.8 km/h

Learn more about velocity here: brainly.com/question/4931057

#SPJ1

4 0
2 years ago
Which of the following best describes Biology
valkas [14]
A. Is the correct answer.
3 0
3 years ago
Read 2 more answers
) A skier starts down a frictionless 32° slope. After a vertical drop of 25 m, the slope temporarily levels out and then slopes
EastWind [94]

Answer:

The skier’s speed on the two level stretches are 22.13 m/s and 27.29 m/s.

Explanation:

Given that,

Slope down = 32°

Height = 25 m

Before leveling,

Slope down = 20°

Height = 38 m

We need to calculate the skier’s speed on the two level stretches

Using formula of energy

P.E=K.E

mgh=\dfrac{1}{2}mv^2

v=\sqrt{2gh}

For first stretch,

Height = 25 m

Put the value into the formula

v=\sqrt{2\times9.8\times25}

v=22.13\ m/s

For second stretch,

Height = 38 m

Put the value into the formula

v=\sqrt{2\times9.8\times38}

v=27.29\ m/s

Hence, The skier’s speed on the two level stretches are 22.13 m/s and 27.29 m/s.

5 0
4 years ago
Q: Through which of the following ways can heat be transferred?
Illusion [34]
A option will be the answer.
7 0
3 years ago
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