PHYSICS HIGH SCHOOL

Each day, Ted can wax 8 cars or wash 10 cars, and Tom can wax 3 cars or wash 5 cars. What is each man's opportunity cost of washing a car?

Answers

Answer 1
Answer:

Answer:

1/2

Explanation:

This will lead us to simultaneous equation since there are two person involved doing the same job each day.

For Ted;

Since Ted can wax 8 cars or wash 10 cars in a day. Mathematically, we have

8x + 10w = 1... (1)

Where x is for waxing cars, w is for washing cars

Similarly for Tom,

Tom can wax 3 cars or wash 5 cars in a day as well, this gives us;

3x + 5w = 1... (2)

Equating 1 and 2, we have;

8x + 10w = 1... (1)

3x + 5w = 1... (2)

Using elimination method, we will multiply eqn 1 by 3 and eqn 2 by 8 to have;

24x + 30w = 3

24x + 40w = 8

Subtracting eqn 4 from 5 we have;

30w - 40w = 3 - 8

-10w = -5

w = 5/10

w = 1/2

Therefore each man's opportunity cost of washing a car is 1/2

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Which change decreases the resistance of a piece of copper wire

Answers

The only easy ways ti decrease the resistance of a piece of wire are...

==> pack the wire in ice; make it colder.

==> cut a piece off of the wire; make it shorter.

Britain and France signed an entente and became thea.
Central Forces.
c.
Central Powers.
b.
Allied Forces.
d.
Axis Powers.

Answers

im pretty sure that it is allied forces

Why does a bullet have more kinetic energy than the recoiling rifle

Answers

They both have the same momentum, not kinetic energy.
When bullet is fired it weights let's say 10 grams (0,01 kg) and has velocity of 1000m/s.
The rifle which weights 10000 grams (10kg) has velocity 1 m/s.
The momentum is equal.

But to calculate kinetic energy you have to use formula
 
Lets calculate:
Bullet's kinetic energy= 1/2*0,01*1000^2 = 5000 J
Rifle's = 1/2*10*1=5 J

So the velocity has much larger impact on kinetic energy than mass.

What is the most current NASA mission on Mars?

Answers

The most recent NASA mission on Mars is Mars Science Laboratory. Its key component was Curiosity rover.
Rover has celebrated his first landing anniversary yesterday (Martian year, that is 687 Earth days).
Curiosity managed to find traces of water on Mars, so it's possible that there used to be some life on Mars.
Since landing Curiosity moved only about 5 miles form the landing site (it suffered wheel damage). 
The mars rover bot i.e curiosity has been send latestly by NASA on mars. You can also see some pics on net if are doing some project or something.

A mirror with a flat surface is aA. plane mirror.
B. convex mirror.
C. concave mirror.
D. virtual mirror.

Answers

This kind of a mirror is called a Plane mirror.

Other types mentioned here are not flat surfaces.

Answer:

The correct answer is option A, Plane Mirror

Explanation:

A plane mirror has a flat surface while remaining concave and convex mirror have bulging surfaces. A concave mirror is a converging mirror while a convex mirror is a diverging mirror. Having a planar surface, the angle of incidence and reflection is equal in a plane mirror. There is nothing like a virtual mirror however the mirrors have the ability to form virtual image.  

Thus among all the options, option A is correct

a negative charge is moving across the room from south to north. a magnetic field runs from east to west. in what direction is the magnetic force moving negative charge? a. toward the east b. toward the west c. toward the floor d. toward the ceiling

Answers

The correct answer is:

c. toward the floor


In fact, we can find the direction of the magnetic force that acts on a positive moving charge by using the right-hand rule:

- index finger: direction of the charge

- middle finger: direction of magnetic field

- thumb: direction of the force

We also have to keep in mind that for a negative charge, we should reverse the direction of the thumb in order to find the correct direction of the force.


In this case:

- index finger: south to north

- middle finger: east to west

- thumb: toward the ceiling

and since the charge is negative, we have to reverse the sign of the thumb, so the magnetic force points toward the floor.
The correct answer for the question that is being presented above is this one: "a. toward the east." A negative charge is moving across the room from south to north. a magnetic field runs from east to west. The direction of the magnetic force moving negative charge is toward the east.
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