How old does an individual need to be in the United states to purchase any tobacco products

If the object is placed 6 cm from a concave mirror the image distance 12 cm what is the image discige of the objects move from t

Alika [10]

Answer:

The image distance is -9.3cm.

6 0

2 years ago

Which of the following is true? A. Drivers entering a driveway or alley should yield to bicyclists and pedestrians on the sidewa

slega [8]

Explanation:

The answer is D. Drivers must always yield to pedestrians and bicylists coming off a main road and always yield to emergency vehicles with lights on. Vehicles in a funeral must have lights on to alert other drivers of their pace and procession.

8 0

3 years ago

You are given three radioactive samples (α, β, and γ) and can only dispose of one. The other two you must keep, one in your hand

Dennis_Churaev [7]

Answer:

Keep alpha in hand, keep beta in pocket, dispose of gamma radioactive sample

Explanation:

Alpha particles:

Alpha particles are the particles which cannot penetrate most of the matter. The outer layer of the skin or a piece of paper may be sufficient to stop the alpha particles.

The Radioactive material that emits the alpha particles can be harmful when they are swallowed, inhaled, or absorbed into blood stream through wounds.

Thus, α radioactive sample can be kept in hand.

Beta particles:

Beta particles are the particles which can be stopped by a few mm of a substance like aluminum layer or by clothing.

Beta particles can penetrate the skin and can cause radiation damage, such as skin burns.

Thus, β radioactive sample can be kept in pocket.

Gamma rays:

Gamma rays are the rays which are penetrating. Many feet of concreted layers or some inches of metal lead are needed to stop them.

Gamma rays are the radiation hazard for the entire human body.

They attack the DNA and can cause lethal defects.

Thus, γ radioactive sample is to be disposed off.

8 0

3 years ago

What inductance l would be needed to store energy e=3.0kwh (kilowatt-hours) in a coil carrying current i=300a?

myrzilka [38]

The formula for the energy stored in the magnetic field of an inductor is:

E = (1/2) (inductance) (current)² .

In the present situation:

Energy = (3 kilo-watt-hour) x (1,000 / kilo) x (joule/watt-sec) x (3,600 sec/hr)

   = (3 · 1000 · 3,600) (kilo·watt·hr·joule·sec / kilo·watt·sec·hr)

   =    1.08 x 10⁷ joules .

Now to find the inductance:

   E = (1/2) (inductance) (current)²

   (1.08 x 10⁷ joules) = (1/2) (inductance) (300 Amp)²

   (2.16 x10⁷ joules) = (inductance) (300 Amp)²

   Inductance = (2.16 x10⁷ joules) / (300 Amp)²

=   2.16 x10⁷ / 90,000    Henrys

   I get    240 Henrys .

This is a big inductance. Possibly the size of your house.
To get a big inductance, you want to wind the coil
with a huge number of turns of very fine wire, in
a small space.
In this case, however, if you plan on running 300A through
your coil, it'll have to be wound with a very thick conductor ...
like maybe 1/4-inch solid copper wire, or even copper tubing,
You have competing requirements.
There are cheaper, easier, better ways to store 3 kWh of energy.
In fact, a quick back-of-the-napkin calculation says that
3 or 4 car batteries will do the job nicely.

5 0

3 years ago

A flask is filled with 1.57 L (L: liter) of a liquid at 90.6 °C. When the liquid is cooled to 10.2 °C, its volume is only 1.38 L

nydimaria [60]

The coefficient of volume expansion of the liquid = 1.97 × 10⁻³ /⁰C

<h3>What is the coefficient of volume expansion of the liquid?</h3>

The amount of volume that a substance expands by per unit of its original volume for each degree that its temperature rises is known as the coefficient of volume expansion.

As we know, The coefficient of volume expansion of the liquid

= change in volume/(original volume × temperature difference)

= (V₂ - V₁)/[V₁ × (T₂ - T₁)]

Change in volume = (V₂ - V₁)

Here, V₂ ( final volume) = 1.31 L

V₁ (initial volume)= 1.55 L

T₂ (final temperature) = 14.7 degrees

T₁ (initial temperature) = 96 degrees

The coefficient of volume expansion of the liquid

= (1.31 - 1.55) / [1.5 × (14.7- 96)]

= 1.97 × 10⁻³ /⁰C

Thus, the coefficient of volume expansion of the liquid = 1.97 × 10⁻³ /⁰C

To know more about coefficient of volume expansion refer to:

brainly.com/question/24042303

#SPJ1

8 0

2 years ago