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Brilliant_brown [7]
3 years ago
5

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass

. Starting with 190 grams of a radioactive isotope, how much will be left after 4 half-lives?
Mathematics
1 answer:
Semmy [17]3 years ago
5 0
190*(1/2)^4 = 190/16 = 11.875 . . . grams
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You are given a box of 100 silver dollars, all facing heads up. You are instructed to shake the box 2 times; after the second sh
Nimfa-mama [501]
100 divided by 2 is 50 and then divided by 6 is 8.333333 but you just round that to 8$.
8 0
3 years ago
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Please help with this
timurjin [86]

Answer:

Hey mate.....

Step-by-step explanation:

This is ur answer.....

Step 1 :-

<h2> 18.12</h2><h2>+ <u>93.3</u></h2><h2> 111.42</h2>

Step 2 :-

<h2> 111.42 </h2><h2>- <u>16.7</u></h2><h2> 94.72</h2>

Hope it helps!

Follow me! ;)

4 0
3 years ago
What net force will make a 5 kg bowling ball accelerate by 1.5 m/s square 2?
s2008m [1.1K]

In pure translation or in roll without slip?

In pure translation, just use Fnet = m*a.  Fnet = 7.5 Newtons

In roll without slip it has effectively more inertia than 5 kilograms.  The effective inertia can be found as:

m_effective = m + I/r^2

For a uniform solid sphere, I = 2/5*m*r^2

So m_effective = 7/5*m

To make a 5 kg bowling ball accelerate at 1.5 m/s^2 in roll without slip, it requires Fnet = 10.5 Newtons, and this ASSUMES that all forces causing the net force on it have lines of action through its center of mass (most common case).

i hope this is what ur looking for

3 0
3 years ago
A car passes a landmark on a highway traveling at a constant rate of 40 kilometers per hour. Two hours later, a second car passe
Ratling [72]
So first you want to find how much the second car gains on the first car in one hour.

Since the second car travels 65 kph, but the first travels 40, we can just subtract 40 from 65 to find how much faster the second car is than the first.

65 - 40 = 25

So the second car is 25 kph faster than the first.

Since the first car had a 2 hour head start, we first want to calculate how far away the first car got from the sign before the second car reached the sign.

So just 2 hours * 40 kph, which gives you 80 kilometers.

So now we know the second car has to gain 80 km on the first car in order to overtake it.

Since the second car gains 25 km per hour on the first car, we can just divide 80 by 25.

80 / 25 = 16/5, or in decimal form 3.2.

So the second car will overtake the first car in 3.2 hours, or 192 minutes, which is also 3 hours and 12 minutes.
3 0
4 years ago
Read 2 more answers
A bag contains lettered tiles. The theoretical probability of choosing a vowel is 40%. The bag contains 72 consonants. How many
rewona [7]

Answer: I'm not so sure but my answer is 101 tiles.

Step-by-step explanation:

Because the probability of choosing a vowel is 40%, and there are 72 consonants, so we would set up the equaiton like this:

72 times 40% (0.40) = 28.8 (round up to 29)

So we have 72 consonants and 29 vowels. Add them up:

72+29 = 101

7 0
3 years ago
Read 2 more answers
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