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Alenkasestr [34]
3 years ago
12

What is the half-life of an isotope that decays to 25% of its original activity in 70.8 hours?

Physics
1 answer:
loris [4]3 years ago
8 0
Are there any options?
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An 800 N man stands on a scale in a motionless elevator. When the elevator begins to move, the scale
DENIUS [597]

Answer:

Net force = 800 – 650

= 150 N

150 = (800 ÷ 9.8) a  

a = 1470 ÷ 800

= 1.8375 m/s^2, downwards

3 0
3 years ago
If a basketball travels a distance of 4 meters in 5 seconds, what is its average speed?
aliya0001 [1]

Average speed = (distance covered) / (time to cover the distance)


Average speed = (4 meters) / (5 seconds)


Average speed = (4/5) (meters/seconds)


Average speed = 0.8 m/s

5 0
3 years ago
A thin block of soft wood with a mass of 0.072 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is
kozerog [31]

Answer:

v’= 279.66 m / s

Explanation:

We work this exercise using the conservation of the moment. For this we define the system formed by the two blocks, therefore the forces during the collision are internal of the action and reaction type.

Initial instant. Before the crash

        p₀ = m v₀ + 0

Final moment. After the crash

        p_f = m v + M v ’

how the tidal wave is preserved

       p₀ = p_f

       m v₀ = m v + M v ’

       v = \frac{m v_o - Mv'}{m}

let's calculate

       v ’= \frac{0.00467 \ 619 - 0.072 \ 22}{0.004676}

       v ’= \frac{2.89- 1.584}{ 0.00467}

       v ’= 279.66 m / s

4 0
3 years ago
How did Confucius believe that kings should behave? (Site 1) HURRY!!!!!​
ch4aika [34]

Answer:

Confucius believe that kings should behave RIGHTLY

Explanation:

CONFUCIUS  believe that kings are supposed to behave rightly and rule justly ( according to the codes of ethics )  of the land and also live a right and just life.

Confucianism is an ancient philosophy established as far back as the fifth century by Confucius it's main aim was to guide the ancient and modern systems of government in the whole of Asia. it is called a religion by some while some call it a code of ethics and way of leadership

4 1
3 years ago
Renewable resources are resources that can be replaced faster than they are used. Which of the following energy resources is ren
SCORPION-xisa [38]

Answer:

a

Explanation:

because your getting energy from the sun

4 0
3 years ago
Read 2 more answers
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