1. I drop a penny from the top of the tower at the front of Fort Collins High School and it takes 1.85 seconds to hit the ground. Calculate the velocity in m/s after 1.10 seconds of freefall and calculate the velocity at impact in mi/hr.

Answers

Answer 1

Answer:
The acceleration of gravity on Earth is 9.8 m/s² .
The speed of a falling object keeps increasing smoothly,
in such a way that the speed is always 9.8 m/s faster than
it was one second earlier.

If you 'drop' the penny, then it starts out with zero speed.
If you also start the clock at the same instant, then

   After 1.10 sec, Speed = (1.10 x 9.8) = 10.78 meters/sec

   After 1.85 sec, Speed = (1.85 x 9.8) = 18.13 meters/sec

But you want this second one given in a different unit of speed.
OK then:

   = (18.13 meter/sec) x (3,600 sec/hr) x (1 mile/1609.344 meter)

   = (18.13 x 3,600 / 1609.344) (mile/hr) = 40.56 mph (rounded)

We did notice that in an apparent effort to make the question
sound more erudite and sophisticated, you decided to phrase
it in terms of 'velocity'. We can answer it in those terms, if we
ASSUME that there is no wind, and the penny therefore doesn't
acquire any horizontal component of motion on its way down.

With that assumption in force, we are able to state unequivocally
and without fear of contradiction that each 'speed' described above ...
with the word 'downward' appended to it ... does become a 'velocity'.

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PLZ EXPLAIN THE EQUATION AND I WILL GIVE BRAINLIST You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father. Which plank will give you the most mechanical advantage? Calculate the MA for each plank

Answers

Answer:

The 8 foot long plank

Explanation: hope this helps :)

Light travels faster in glass than it does in a vacuum. Please select the best answer from the choices provided T F

Answers

From among the choices provided, the better answer is ' F ',
the initial letter of the word ' False '.

Light does not travel faster in glass than it does in vacuum.
Light travels slower in glass than it does in vacuum.

As a matter of fact, light travels slower in anything than it does
in vacuum.

False.

Light travels faster in vacuum than in glass.

Juana performs the calculation below. 6.05 + 3.156 + 5.0 How should she report the answer using the correct number of significant figures?

Answers

Juana performs the calculation of6.05 + 3.156 + 5.0. The answer is 14.206. Juana should report the answer as 14by using the correct number of significant figures. In adding numbers withsignificant figures, Juana should note that the number of significant figuresthat she can report should be the minimum.

Answer:

THE ANSWER IS C 14.2

Explanation:

I just took the test

The effectiveness of an optical lens is attributed to:diffraction
reflection
refraction
interference

Answers

Answer: Refraction.

Explanation: The lenses are used to "transmit" the light that hits the lens in a certain way.

The phenomena in which the light penetrates a medium (where the medium, in this case, is the lens) is called diffraction.

Reflection would be more related to mirrors, difraction is the change of the velocity of the light waves when they are in different mediums, and interference refers to the interaction between two coherent waves (it can be destructive interference, where the waves cancel each other, or constructive interference, where the waves add to each other)

refraction is the right answer

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

Answers

The answer is B

If we assign speed variable x; and time variable y; then;

xy=150

(y-1) (x+5) = 150

xy + 5y - x – 5 = 150

(remember xy = 150), therefore;

5y – x = 5

X = 25

Y = 6

150(x+5)-150x=x(x+5)
150x+750-150x=x^2+5x
x^2+5x-750=0
(x-25)(x+30)=0
x=25

Tierra is playing in her backyard when she hears her friend calling out to her. She can't see her friend but can hear her friend's voice. Which wave phenomenon helps explain why Tierra can hear her friend even when she can't see her?interference

refraction

superposition

diffraction

Answers

Answer : diffraction

Explanation : Diffraction is the phenomenon of bending of sound waves around the small openings or obstacles.

Tierra is playing in her backyard when she hears her friend calling out to her. Tierra can hear her friend even when she can't see her. This is because the sound is spreading out from the small openings and hence diffraction of sound wave occurs.

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