A sample contains 16 g of a radioactive isotope. how much radioactive
isotope remains in the sample after 1 half-life?

The motorcycle's average velocity will be 20 m/sec. The ratio of the overall distance traveled to the total time taken by the body is the average velocity.

The average velocity is the ratio of the total distance traveled to the total time taken by the body. Its unit is m/sec.

V= 72km/hr =20 m/sec

Total distance travelled by the  motorcycle;

D= v ×t

D=(20 m/sec)×20 sec

D=400 m

The average velocity is:

[tex]\rm v_{avg}=\frac{d_{total}}{t_{total}} \\\\ \rm v_{avg}=\frac{400}{20} \\\\ v_{avg}=20 m/sec[/tex]

Hence,the motorcycle’s average velocity will be 20 m/sec.

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Volume?

Let's see

Volume:-

Answer:

False

Explanation:

A graphic organizer is a written out explanation of similarities and differences among topics. A graphic organizer is a visual representation. Another name for a chart is "Venn diagram." Compare and contrast graphic organizers identify only similarities among sets of information.

Answer:

An extreme redshift of emission lines that indicated high recessional

The electrostatic force between these electrons will be 2.3×10⁻²⁰ N.

The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Charges that are similar repel each other, whereas charges that are diametrically opposed attract each other.

They will repel, moving in opposite directions at the same speed. Because the magnitude and nature of the charge are same.

The electrostatic force between these electrons is;

[tex]\rm F= \frac{Kq_1q_2}{r^2} \\\\ F=\frac{9 \times 10^9 \times -1.6 \times 10^{-19} \times- 1.6 \times 10^{-19} }{(0.10 \times 10^-3)^2} \\\\F= 2.3 \times 10^{-20} \ N[/tex]

Hence, the electrostatic force between these electrons will be. 2.3×10⁻²⁰ N.

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Answer:

c on ed

Explanation:

I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.

The theoretical capacity of a process can be defined as the ability to perform a given work in a given period of time.

The theoretical capacity of a process is not only dependent on the time that takes to carry out but also on other variables (e.g., temperature, light conditions, etc).

In conclusion, I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.

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Answer:

$ .0248      or   2.48 cents

Explanation:

60 + 100 + 150 = 310 watts

  for one hour  =  310 watt- hr    or    .31 kw- hr

      .31 kw-hr   *  .08 / kw-hr  =  .0248

Answer:

f λ = c = 3.00E8      frequency * wavelength = speed of light

λ = c / f = 3.00E8 / 4.0E14 = 7.5E-7 m

Note 1 angstrom = 1.00E-10 m and 1 milli-micron = 1.00E-9 m

So the wavelength would be 7500 angstroms

The visible spectrum is 4000 A - 7000 A  or 400 - 700 milli-microns

Answer:

Average speed = 2.5 mph

Distance = 22.352 meters

Explanation:

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

You can use this formula for any question like this

The frequency of the ultraviolet light given that its wavelength is 100 nm is 3×10¹⁵ Hz

The frequency of the light can obtain as illustrated below:

v = λf

3×10⁸ = 100×10¯⁹ × f

Divide both side by 100×10¯⁹

f = 3×10⁸ / 100×10¯⁹

f = 3×10¹⁵ Hz

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Answer:

It passes another car that travels southward at 60 km/h. Do both cars have the same speed? Do they have the same velocity? Answer: Both cars have the same speed, but they have opposite velocities because they are moving in opposite directions.

Explanation:

Answer:

See below ~

Explanation:

As the magnitude (absolute numerical value) of both cars are equal, they both have the same speed.

But, as they are travelling in opposite ways, they have different directions. Hence, they have different velocities.

a)The time taken between the parcel leaving the airplane, and it's striking the ground will be 6.38 second

c)The speed at which the parcel strikes the ground will be 62.64 m/sec.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by U for the initial speed while V for the final speed. its SI unit is m/sec.

The given data in the problem is;

Steady speed (V)= 90 m/s

Altitude (h) = 200 m

Time taken (t)=?

horizontal distance travelled(d)=?

Striking speed(V)=?

The striking speed is;

[tex]\rm V^2=U^2+2gh \\\\ V=\sqrt{2gh} \\\\V=\sqrt{2\times 9.81 \times 200} \\\\ V= \sqrt{3924} \\\\ V=62.64 \ m/sec[/tex]

The time taken is found as;

[tex]\rm H = ut + \frac{1}{2} gt^2 \\\\ 200=0+ \frac{1}{2} \times 9.81 \times t^2 \\\\ t=6.38 \ sec[/tex]

Hence, the time taken between the parcel leaving the airplane, and it's striking the ground will be 6.38 second

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The order of band in which the light becomes the brightest is n = 0.

Diffraction is the phenomena of the spreading of waves around obstacles. Diffraction occurs in electromagnetic radiation, such as light, X-rays, and gamma rays, etc.

When light waves pass near a barrier they tend to bend around that barrier and become spread out.

The order bands n=2 becomes dimmest due to the spreading out of the light wave.

Thus, the order of band in which the light becomes the brightest is n = 0.

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n = 0 is correct for edge. :)

Answer:

nerves

Explanation:

The optic nerve is the nerve in each eye that carries the signal from your eye to your brain.

The depth of the crack along the aeroplane wing is determined as 1.5 m.

The depth of the crack in the wing from which the echo is heard is calculated as follows;

d = (vt)/2

From the image;

d1 = (5000 x 0.4 x 10⁻³)/2

d1 = 1 m

d2 = (5000 x 0.8 x 10⁻³)/(2)

d2 = 2 m

Average depth

d = (d1 + d2)/2

d = (1 + 2)/2

d = 1.5 m

Thus, the depth of the crack along the aeroplane wing is determined as 1.5 m.

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Answer:The answer is 2

I believe a scale is good

Answer:

"Both students are correct. When light is traveling through small openings, solids, liquids, gases, or a vacuum, it behaves like a wave. When it interacts with matter, it acts like a stream of particles."

Explanation:

just got it right

Refer to the attachments

Note that

Like charges attract each other and unlike charges repel each other

Answer:

the third option

Explanation:

Answer:

Ocean water 97.5% Freshwater frozen as ice 1.5% and freshwater 1%

Explanation:

The thin atmosphere of Mars is thought to be due to the planet's lack of a magnetic field, which has allowed the Solar wind to blow away much of the gas the planet once had. Venus, despite still having a thick atmosphere of CO2, surprisingly has a similar problem

The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.

Newton's third law of motion states action and reaction are equal and opposite. That is the force applied to an object is equal in magnitude to force experienced by the object but in opposite direction.

From the given question, when the bag exert a certain on the athlete, the athlete also exerts similar force to the bag but in opposite direction.

Thus, the complete sentence is as follows;

The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.

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The ideal mechanical advantage of the crowbar will be 0.7.IMA is also equal to the distance traveled by the load divided by the distance traveled by the effort.

The ideal mechanical advantage of a lever is equal to the length of the effort arm divided by the length of the resistance arm.

The ideal mechanical advantage is found as;

[tex]\rm IMA=\frac{0.35}{0.5} \\\\ IMA=0.7[/tex]

Hence,the ideal mechanical advantage of the crowbar will be 0.7.

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Answer:

678908765456789

Explanation:

Answer

When you are riding in a coaster car that is traveling at a constant speed, you only feel the downward force of gravity. But as the car speeds up or slows down, you feel pressed against your seat or the restraining bar. You feel this force because your inertia is separate from that of the coaster car.

Explanation:

Answer:

2. ( b ) zero

3. ( c ) 10 s

4. Uniform then decreasing

Explanation:

2.

Since the motion is uniform, initial and final velocity will be 0, hence acceleration will be zero.

3.

Initial velocity ( u ) = 5 m/s

Final velocity ( v ) = 35 m/s

Acceleration ( a ) 3 m/s^2

To find : Time ( t )

Formula : -

t = v - u / a

 = 35 - 5 / 3

 = 30 / 3

t = 10 s

Answer:

See below ~

Explanation:

Q2

The uniform circular motion in the movement of object in a circular path with fixed and perpendicular on the direction of the motion acceleration.

Q3

Q4

The vertical component for a projectile by acute angle on the horizontal axis changes from decreasing then increasing velocity.

Answer:

1. 2 m/s/s

Explanation:

Formula

Force = Mass x Acceleration

The time taken by the train will be 13.84 sec. Time taken is the ratio of the distance and speed.

Distance is a numerical representation of the distance between two objects or locations.

Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

Distance is found as the product of the speed and velocity.

Distance = speed × time

time = Distance/speed

time= 1275 (m)/92.1( m/sec)

time(t) =13.84 sec

Hence, the time taken by the train will be 13.84 sec

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