PHYSICS HIGH SCHOOL

Dirty windshields __________.a. reflect light into your eyes, causing glare
b. reflect light away from the vehicle, making the road appear dim
c. will not become fogged
d. none of the above

Answers

Answer 1
Answer: The answer : Dirty windshields reflect light into your eyes, causing glare.  Dirty glass reflects light, obscuring your view when sunlight or other bright light shines through it.  So, it is better to keep your windshield clean, both inside and out. 

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A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hour. Give the original speed of the train. a. 20 miles/hour b. 25 miles/hour c. 30 miles/hour d. 35 miles/hour

Scientists use models to A) increase the duration of a volcanic eruption
B) change the location of a volcanic eruption
C) predict the damages due to an earthquake
D) stop the occurrence of tsunamis due to an earthquake

Answers

D Is Thw Correct answer

A shorter electromagnetic wave is _____. more powerful less powerful hotter colder

Answers

Answer

more powerful 

Explanation
Electromagnetic waves are waves that do not require material medium for propagation. For example x-rays, UV and gamma rays.

From the wave equation, V= λf, when the wavelength is short the frequency is high. 
Frequency determines the intensity of the wave. When high the frequencies are high the waves has more penetrating power, hence more powerful. 

Answer:

More powerful

Explanation:

I answered it and got it right.

An elevator is used to either raise or lower sacks of potatoes. In the diagram, a sack of potatoes of mass 10 kg is resting on a scale that is resting on the floor of an accelerating elevator. The scale reads 12 kg. What is the acceleration of the elevator?

Answers

Technically, if your question refers us to a diagram, then you owe us a peek at the
diagram. But there may be enough info in the description to solve this one blind.

Newton's second law of motion: F = M A
"The force on an object is the product of the object's mass and its acceleration."

Divide each side by 'A': A = F / M
"The rate at which an object accelerates is its mass divided by the force on it."
Hold that thought for a moment, while we go off on a tangent:
================================
Everybody talks about "kg" as if it were a force, and this question shows why
that's a terrible thing to do.  In this question, "kg" is used BOTH as a mass AND
as a force. I can't think of a better way to confuse students who are just now
working with this stuff for the first time. The question is badly written, although,
in the real world, scales do read in 'kg'.
"Kg" is a mass. It is not a force.

I think that rather than try to teach more physics to get out of this hole,
the best way to go at it is like this:

If the scale were sitting still, on the ground, or rising at a steady rate and
not accelerating, then the only force on the 10 kg mass would be the force
of gravity, and the scale would read '10 kg'. But in the upward-accelerating
elevator, the scale reads 20% more, telling us that 20% more than the force
of gravity is acting on the mass. That extra 20% of upward force is provided
by the upward acceleration, which must be 20% of the acceleration of gravity.
The acceleration of gravity is 9.8 meters per second² .
The elevator is accelerating (0.2 x 9.8) = 1.96 meters per second².
 


.

A temperature of 200°F is equivalent to approximately A. 232°C.
B. 93.3°C.
C. 840°C.
D. 37.8°C.

Answers

C = 5/9 x (°F - 32)

C = 5/9 (200 - 32)

C = 5/9 x 168

C = 37.74 C or to round off 37.8 C

Hope this helps

The transuranium synthesis process involves creating a transuranium element through ____.A.) The synthesis of heavy elements
B.) The transmutation of a lighter element
C.) The transmutation of uranium

Answers

The transuranium synthesis process involves creating a transuranium element through the transmutation of a lighter element. The answer is letter B. Transuranium elements are the elements with atomic numbers greater than 92. All of these elements are unstable and decay radioactively into other elements.

What is produced when calcium reacts with fluorine in a synthesis reaction

Answers

Calcium fluoride is produced. It is one Calcium atom bonded to two fluoride atoms. The Calcium atom receives one electron from one fluoride and a second electron from the second fluoride atom. As a result of receiving the two electrons, Calcium will have a negative charge. The two fluorides become positive from losing an electron. The positive and negative charge attraction keeps the atoms close together to form an ionic bond.
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