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3 years ago

Why doesn't the skateboarder rolls as high up the ramp each time you go down the ramp

Physics

1 answer:

Alexandra [31]3 years ago

5 0

Because of the law of inertia and it’s effect on the skater

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A piece of wire 29 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral tria

skelet666 [1.2K]

Answer:

Explanation:

Total length of the wire is 29 m.

Let the length of one piece is d and of another piece is 29 - d.

Let d is used to make a square.

And 29 - d is used to make an equilateral triangle.

(a)

Area of square = d²

Area of equilateral triangle = √3(29 - d)²/4

Total area,

$A = d^{2}+\frac{\sqrt3}{4}\left ( 29-d \right )^{2}$

Differentiate both sides with respect to d.

$\frac{dA}{dt}=2d- \frac{\sqrt3}{4}\times 2(29-d)$

For maxima and minima, dA/dt = 0

d = 8.76 m

Differentiate again we get the

$\frac{d^{2}A}{dt^{2}}= + ve$

(a) So, the area is maximum when the side of square is 29 m

(b) so, the area is minimum when the side of square is 8.76 m

8 0

3 years ago

A solid yellow stripe is to be painted in the middle of a certain highway. If 1 gallon of paint covers an area of p square feet

marin [14]

Answer:

option A is correct

Explanation:

Given:

The length to be painted = m miles

The width to be painted = t inches

Area painted in 1 gallon = p square feet

Converting the every given dimension in feet, we have

length to be painted = m × 5280 feet

width to be painted = t/12 feet

area to be painted = (m × 5280 feet) × t/12 feet

now, applying the unitary method, we have

p square feet is painted ⇒ 1 gallon

1 square feet is painted ⇒ 1/p gallon

(m × 5280 feet) × t/12 feet square feet is painted ⇒ [(m × 5280 feet) × t/12 feet ] × 1/p gallon

thus, we get the gallons of paint required as 5820 mt/12p

hence option A is correct

3 0

3 years ago

Explain four different types of fitness technologies that are used to help improve your fitness level.

irina1246 [14]

Answer: endurance, strength, balance, flexibility

Explanation:

walking, jogging, swimming, biking

4 0

2 years ago

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

RideAnS [48]

It was super heated to turn in to a liquid

3 0

3 years ago

Which diagram shows the resulting wave when they cross at point X?

zvonat [6]

The resulting wave will have zero amplitude, thus it will form a straight line.

<h3>What is a crest?</h3>

A crest is an upward displacement of a progressive wave.

<h3>What is a trough?</h3>

A trough is a downward displacement of a progressive wave.

<h3>Superimposition of the two waves</h3>

When the two waves meet each other at point X, they will superimpose and cancel out since they have equal amplitude and are in opposite direction.

The resulting wave will have zero amplitude, thus it will form a straight line.

Learn more about crest here: brainly.com/question/1430231

#SPJ1

5 0

2 years ago

Why doesn't the skateboarder rolls as high up the ramp each time you go down the ramp ​

Why doesn't the skateboarder rolls as high up the ramp each time you go down the ramp