What is the half life of each of these radioactive isotopes?a radioactive isotope decreased to one-fourth its original amount in 18 months.

Answers

Answer 1

Answer:
One fourth means (one half) of (one half) .

So the 18 months must be two half-lifes.

The half-life of this particular isotope is 9 months.

Answer 2

Answer: The half life would be 9 months long.

Related Questions

A 7.5 kg block is placed on a table . If it's bottom surface area is 0.6m2 how much pressure does the block exert on the table top?
Cliff divers at Acapulco jump into the sea from a cliff $30.7 m$ high. At the level of the sea, a rock sticks out a horizontal distance of $9.34 m$.The acceleration of gravity is $9.8 m / s ^{2}$. With what minimum horizontal velocity must the cliff divers leave the top of the cliff if they are to miss the rock? Answer in units of $m / s$.
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What is speed of a particle?

Answers

The speed of a particle is the instantaneous rate at which its distance of travel
is changing.

Over any finite period of time, its speed is:

(distance traveled) / (time to travel the distance).

The direction of travel is irrelevant to a description of speed.

SPEED = total DIST. traveled / total time taken

A 1.7-kg block of wood rests on a rough surface. A 0.011-kg bullet strikes the block with a speed of 670 m/s and embeds itself. The bullet-block system slides forward 2.4 m before coming to rest.

Answers

What is the coefficient of kinetic friction between the block and the surface? Express your answer using two significant figures.

Answer:

0.39

Explanation:

Given information

m1=1.7 Kg

m2=0.011 Kg

v2=670 m/s

d=2.4 m

m2v2=(m1+m2)v hence $v=\frac {m2v2}{m1+m2}$ and also $a=\frac {v^(2)}{2d}$

The deceleration due to friction is given by

$F=\mu_k N=\mu_k W=\mu_k (m1+m2)g$

$F=(m1+m2)a=\mu_k (m1+m2)g$ therefore $a=\mu_k g$

Therefore, $a=\frac {v^(2)}{2d}=\mu_k g$

$\mu_k=\frac {1}{2dg}(\frac {m2v}{m1+m2})^(2)=\frac {1}{2*2.4*9.81}* (\frac {0.011*670}{1.7+0.011})^(2)$

$\mu_k=0.39$

If the Sun has 28 times more gravity than Earth,
what is your weight on the Sun?

Answers

If someone have weight that is force due to gravity is X than on the sun it will become 28 X.

What is force?

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Mass of body is constant on any place in the universe and weight changes with acceleration due to gravity so, at sun weight will be 28 X.

If someone have weight that is force due to gravity is X than on the sun it will become 28 X.

To learn more about force refer to the link:

brainly.com/question/13191643

#SPJ2

i myself weigh 111 pounds.
if the sun makes u weight 28 times more, then
111 x 28 = 3108

Physics question WILL GIVE BRAINLIEST!!! A 1,600 kg train car rolling freely on level track at 16 m/s bumps into a 1.0 x 10^3 kg train car moving at 10.0 m/s in the same direction, and the two latch onto each other and continue together. What is their final speed?10 m/s
14 m/s
6.0 m/s
16 m/s

Answers

Answer:

$v'\approx 14\ m/s$

Explanation:

Linear Momentum

Two objects of masses and moving in a linear path at speeds and respectively have a total momentum of

$p=m_1v_1+m_2v_2$

When the objects collide, a change of conditions occurs and they start to move at different speeds. The necessary condition to find the after-colliding speeds is the conservation of linear momentum that states the total momentum of an isolated system doesn't change regardless of the internal interactions of the objects. Thus, the new momentum is

$p'=m_1v_1'+m_2v_2'$

And they must be the same, thus

$m_1v_1'+m_2v_2'=m_1v_1+m_2v_2$

We know both cars stick together after the collision, so the final speed is common to both, and the above formula becomes

$(m_1+m_2)v'=m_1v_1+m_2v_2$

Solving for v'

$\displaystyle v'=(m_1v_1+m_2v_2)/((m_1+m_2))$

Plugging in the values, we have

$\displaystyle v'=((1600)(16)+(1000)(10))/((1600+1000))$

$\boxed{v'=13.69\ m/s}$

Correct option (closest to the computed speed): 14 m/s

How does an atom charge if all the electrons are removed

Answers

Answer:

it will change to become a positively charged ion called a cation.

Explanation:

Ions are formed when an atom gains or loses electrons from its valence shell. This process causes an imbalance between the number of positively charged protons and negatively charged electrons, so the overall ion will carry a net positive or negative charge (I got this explanation from google)

Answer: its does not have any charge but it still might have nuetrons.

Explanation:

Sound waves travel faster in: a. solids as compared to liquids. b. liquids as compared to gases. c. warm air as compared to cooler air. d. All of the above are correct.

Answers

Answer:

d all of the above are correct

Other Questions

Einstein calculated that ripples of gravity travel at exactly the speed of _____

A child's toy consists of a spherical object of mass 50 g attached to a spring. One end of the spring is fixed to the side of the baby's crib so that when the baby pulls on the toy and lets go, the object oscillates horizontally with a simple harmonic motion. The amplitude of the oscillation is 6 cm and the maximum velocity achieved by the toy is 3.2 m/s . What is the kinetic energy K of the toy when the spring is compressed 5.1 cm from its equilibrium position?Problem-Solving Strategy: Simple Harmonic Motion II: EnergyThe energy equation, E=12mvx2+12kx2=12kA2, is a useful alternative relationship between velocity and position, especially when energy quantities are also required. If the problem involves a relationship among position, velocity, and acceleration without reference to time, it is usually easier to use the equation for simple harmonic motion, ax=d2xdt2=−kmx (from Newton’s second law) or the energy equation above (from energy conservation) than to use the general expressions for x, vx, and ax as functions of time. Because the energy equation involves x2 and vx2, it cannot tell you the sign of x or of vx; you have to infer the sign from the situation. For instance, if the body is moving from the equilibrium position toward the point of greatest positive displacement, then x is positive and vx is positive.IDENTIFY the relevant conceptsEnergy quantities are required in this problem, therefore it is appropriate to use the energy equation for simple harmonic motion.SET UP the problem using the following stepsPart AThe following is a list of quantities that describe specific properties of the toy. Identify which of these quantities are known in this problem.Select all that apply.Select all that apply.maximum velocity vmaxamplitude Aforce constant kmass mtotal energy Epotential energy U at xkinetic energy K at xposition x from equilibriumPart BWhat is the kinetic energy of the object on the spring when the spring is compressed 5.1 cm from its equilibrium position?Part CWhat is the potential energy U of the toy when the spring is compressed 5.1 cm from its equilibrium position?

Driving home from school one day, you spot a ball rolling out into the street (Figure 5-21). You brake for 1.20 s, slowing your 950-kg car from 16.0 m/s to 9.50 m/s.a) What was the average force exerted on your car during braking? b) How far did you travel while braking?

PLEASE IS URGENT! "An object is decelerating. Suggest the resultant force acting on the object".