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Brut [27]
3 years ago
8

5) Choose the best revision of the following statement: "All the isotopes of a particular element decay radioactively by

Physics
1 answer:
tino4ka555 [31]3 years ago
5 0

Answer:

B. some isotopes are stable and others are unstable. unstable isotopes decay by emitting various subatomic particles and radiation.

Explanation:

test gave me the answer so yeah :/ XD

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I'll give brainliest if you give me a good awnser. :)
lbvjy [14]

Answer:

0.5

Explanation:

4 0
3 years ago
Read 2 more answers
(1 point) A projectile is fired from ground level with an initial speed of 600 m/sec and an angle of elevation of 30 degrees. Us
konstantin123 [22]

Answer:

(a) The range of the projectile is 31,813.18 m

(b) The maximum height of the projectile is 4,591.84 m

(c) The speed with which the projectile hits the ground is 670.82 m/s.

Explanation:

Given;

initial speed of the projectile, u = 600 m/s

angle of projection, θ = 30⁰

acceleration due to gravity, g = 9.8 m/s²

(a) The range of the projectile in meters;

R = \frac{u^2sin \ 2\theta}{g} \\\\R = \frac{600^2 sin(2\times 30^0)}{9.8} \\\\R = \frac{600^2 sin (60^0)}{9.8} \\\\R = 31,813.18 \ m

(b) The maximum height of the projectile in meters;

H = \frac{u^2 sin^2\theta}{2g} \\\\H = \frac{600^2 (sin \ 30)^2}{2\times 9.8} \\\\H = \frac{600^2 (0.5)^2}{19.6} \\\\H = 4,591.84 \ m

(c) The speed with which the projectile hits the ground is;

v^2 = u^2 + 2gh\\\\v^2 = 600^2 + (2 \times 9.8)(4,591.84)\\\\v^2 = 360,000 + 90,000.064\\\\v = \sqrt{450,000.064} \\\\v = 670.82 \ m/s

5 0
3 years ago
When you jump up, you exert an action force on the ground. What's the reaction force? A. your weight B. Earth's gravity C. the g
GuDViN [60]

Answer:

A is the correct answer

6 0
4 years ago
Read 2 more answers
An object which is dropped from a certain height has zero (0) initial velocity.
gavmur [86]

Answer:

0 m/s

Explanation:

if an object is dropped we know the initial velocity is zero when in free fall

8 0
3 years ago
Why are rift zones common placed for igneous rock to form
Vinil7 [7]
Igneous rocks are formed from molten rock cooling.  Rift zones are a common place for them to form because there is two tectonic plates connecting which is a common place for volcanoes to form.
6 0
4 years ago
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