Questions posted in Physics

How does the size of the sun compared to the size of other stars

The sun is smaller than the other stars. It only seems big because it's the closest one to us. 

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

In the periodic table the most reactive metals are found

In or near the bottom of the chart.

This varies between some metals. Iriduim or Ir is in the middle toward the bottom.

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

The careful use of resources is

Conservation is ur answer

ANSWERED AT 23/09/2019 - 04:23 AM


QUESTION POSTED AT 23/09/2019 - 04:23 AM

Help me with these questions please thank you

I am sorry but all I know is that 10. is abruptly. I hope it helps anyways

ANSWERED AT 23/09/2019 - 04:22 AM


QUESTION POSTED AT 23/09/2019 - 04:22 AM

A race car travels around a circular track. How can I explain why the car is accelerating even though the driver maintains constant speed?

You do it by pointing out that 'acceleration' does NOT mean speeding up.

"Acceleration" means ANY change in the motion, whether it's
speeding up, slowing down, or changing direction.

If a driver wants to stay on the circular track and not run off into the bushes,
then he has to keep changing the DIRECTION of the car's motion.

ANSWERED AT 23/09/2019 - 04:21 AM


QUESTION POSTED AT 23/09/2019 - 04:21 AM

Describe the energy transformations that occur when a piece of wood is burned

Chemical to Thermal. From hydrocarbon basic into exothermal process, with the involvement of oxygen as a basic requirement of burning process.

ANSWERED AT 23/09/2019 - 04:21 AM


QUESTION POSTED AT 23/09/2019 - 04:21 AM

14.603 rounded to the nearest whole number

15 because 14.6 is to the tenth'

so its 15

ANSWERED AT 23/09/2019 - 04:18 AM


QUESTION POSTED AT 23/09/2019 - 04:18 AM

In every energy transformation, some energy is always "lost" as ______ energy.

Kenetic energy as potential energy is stored energy 

ANSWERED AT 23/09/2019 - 04:16 AM


QUESTION POSTED AT 23/09/2019 - 04:16 AM

An angler experiences a glare of light coming from the water's surface. Which type of glasses should she wear to minimize the glare?

He should wear polarizing sunglasses.

The glare is reflected light.  Reflected light is always substantially polarized.
He can cut the glare almost completely, but in order to do that, he'll need to
rotate his glasses until the polarization of the lenses is perpendicular to the
polarization of the glare. 

(I've never understood how you're supposed to do that.)

ANSWERED AT 23/09/2019 - 04:15 AM


QUESTION POSTED AT 23/09/2019 - 04:15 AM

Why are petroleum and natural gas deposits highly sought after

Natural Gas is a gas, it's basically the lightest fraction of petroleum that separates naturally in the reservoir.

You can ship it, it's just hard, you can put it on trucks ala cng as well. We've recently mastered liquefaction, which required cryogenic tech, but this means we can ship it by tanker.

Gas burns much cleaner, but is not as useful as oil for making plastics and other chemicals. It can be easier to move as a gas, however, and engines that run off it can be simpler and far more reliable (turbines love ng, but some can use road gas as well).

Also in the earlier days of oil production no was considered a waste product and simply burned at the pump, but like most things involving oil, they found a way to make the best use of the lightest fraction as well (the heaviest fraction was turned into plastics and highways, it seemed a pity to waste it).

Another note: gasoline was originally a waste product as well, ships ran on diesel and fuel oil, the choice of gasoline for car engines was as much because it was an otherwise wasted fraction (can't really burn it for heat) as anything, though ironically the demand made it one of the most critical fractions.

ANSWERED AT 23/09/2019 - 04:15 AM


QUESTION POSTED AT 23/09/2019 - 04:15 AM

What is Uranium in the periodic table?

The symbol of Uranium is: UThe Atomic number is: 92

ANSWERED AT 23/09/2019 - 04:12 AM


QUESTION POSTED AT 23/09/2019 - 04:12 AM

It takes a car 1.75 h to go from mile marker 115 what's the average speed of the car?

The average speed of the car is

               (the mile marker he passes at the end of the 1.75 h) minus 115
divided by
               (1.75 hours) .

The unit is 'miles per hour'.

ANSWERED AT 23/09/2019 - 04:12 AM


QUESTION POSTED AT 23/09/2019 - 04:12 AM

If you plug in your electrical heater in for 15.0 minutes and then in the process used 16,000 J how much power did you use


         Power  =  (energy)  /  (time)

BUT ... it has to be joules and seconds.

       (15 minutes) x (60 sec/min) = 900 seconds

             Power  =  (energy)  /  (time)

                       =  (16,000 J)  /  (900 seconds)

                       =     (16,000 / 900)        joule/sec

                       =     (17 and 7/9) watts.

That's not much for a 'heater'.

A typical SMALL heater pours out like 1200 watts or 1500 watts.

A company that sells heaters that only put out 17 watts
won't be able to sell many of them, because they're 
pretty useless as heaters.

Maybe they could be used as aquarium heaters, or as
hamster-cage heaters.

ANSWERED AT 23/09/2019 - 04:11 AM


QUESTION POSTED AT 23/09/2019 - 04:11 AM

True or false clouds reflect the majority of incoming infrared radiation back out into space

False clouds don't the ozone layer does

ANSWERED AT 23/09/2019 - 04:11 AM


QUESTION POSTED AT 23/09/2019 - 04:11 AM

An automobile with a mass of 1108 kg accelerates at a rate of 3 m/s² in the forward direction. What is the net force acting on the automobile?

Newton's 2nd law of motion:

             Net force  =  (mass)  x  (acceleration)

                             = (1,108 kg) x (3 m/s² forward)

                             =    3,324  kg·m/s² forward

                             =    3,324 newtons forward

ANSWERED AT 23/09/2019 - 04:06 AM


QUESTION POSTED AT 23/09/2019 - 04:06 AM

If a sample that is 4860 years old has 50 radium atoms remaining, how many atoms were in the original sample?

243000, take the 4,860 and times it by 50

ANSWERED AT 23/09/2019 - 04:06 AM


QUESTION POSTED AT 23/09/2019 - 04:06 AM

The force required to turn a screwdriver can be reduced by ?

The force required to turn a screwdriver can be reduced
by making the handle of the screwdriver fatter.  

The torque applied to turning the screw is (the force you apply
to the outside of the handle) multiplied by (the radius of the handle,
away from the central shaft).

By making the radius of the handle larger, you increase the torque
applied to turn the screw.

ANSWERED AT 23/09/2019 - 03:58 AM


QUESTION POSTED AT 23/09/2019 - 03:58 AM

How many liters would be equal to 8 milliliter

1 Milliliter equal to .0.001 Liter.

So 8 milliliters will be 0.008.

ANSWERED AT 23/09/2019 - 03:55 AM


QUESTION POSTED AT 23/09/2019 - 03:55 AM

What force is necessary to accelerate a 70kg object at a rate of 4.2m/s squared

Newton's 2nd law of motion:

                Force  =  (mass) · (acceleration)

                           =  (70 kg) · (4.2 m/s²)

                           =  (70 · 4.2)  kg·m/s²

                           =      294 newtons

ANSWERED AT 23/09/2019 - 03:49 AM


QUESTION POSTED AT 23/09/2019 - 03:49 AM

Can someone give me 8-9

8).  A rubber band is storing more elastic energy in it when it's stretched. 
It's the work you had to do to stretch it.

9).  Radio, TV, microwave, infrared (heat), visible light, ultraviolet light, X-rays,
and gamma rays are all part of the electromagnetic spectrum, and all of them
carry energy from one place to another.

ANSWERED AT 23/09/2019 - 03:47 AM


QUESTION POSTED AT 23/09/2019 - 03:47 AM

What are two forms of mechanical energy

Kinetic energy and Potential energy

ANSWERED AT 23/09/2019 - 03:46 AM


QUESTION POSTED AT 23/09/2019 - 03:46 AM

Which of the following is considered a contact forces?1) the force between two magnets. 2)the gravitational pull of a planet. 3)friction between an object and air. 4)the force between two charged particles.

The force between two magnets, the gravitational forces between two objects,
and the forces between two charged particles DON't require that the objects
be touching each other.

The forces of friction between an object and air, or the forces of friction
between two objects that are sliding, DO only happen when the two are
in contact with each other.

ANSWERED AT 23/09/2019 - 03:45 AM


QUESTION POSTED AT 23/09/2019 - 03:45 AM

If the speed of the ball increased from 1 m/s to 4 m/s by how much would kinetic energy increase

KE= \frac{1}{2} m v^{2} . Plug your velocity in, ignoring the rest of the formula. 
 1^{2} = ?
4^{2} =?

ANSWERED AT 23/09/2019 - 03:44 AM


QUESTION POSTED AT 23/09/2019 - 03:44 AM

A 1 kilogram ball has 8joules of kinetic energy what is its speed

We know that KE=9J and the Mass (m) = 1kg. The formula to find this is going to be our Kinetic Energy Equation. K= \frac{1}{2} m v^{2} . But we will rearrange it to find the veloctiy so it looks like this: v= \sqrt{\frac{2K}{m} } . Then just plug in the variables and solve.

ANSWERED AT 23/09/2019 - 03:43 AM


QUESTION POSTED AT 23/09/2019 - 03:43 AM

The answer and why it's that one

The force between two magnets, the gravitational forces between two objects,
and the forces between two charged particles DON't require that the objects
be touching each other.

The forces of friction between an object and air, or the forces of friction
between two objects that are sliding, DO only happen when the two are
in contact with each other.

ANSWERED AT 23/09/2019 - 03:41 AM


QUESTION POSTED AT 23/09/2019 - 03:41 AM

The interaction between two objects that have a positive or negative charge is an blank force what is the blank

It is Electromagnetic force

ANSWERED AT 23/09/2019 - 03:40 AM


QUESTION POSTED AT 23/09/2019 - 03:40 AM