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3 years ago

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A long, thin cloud that stretches from directly overhead to the western horizon would have an angular size of ___________ degree

s.

1 answer:

-BARSIC- [3]3 years ago

6 0

Answer:

A long, thin cloud that stretches from directly overhead to the western horizon would have an angular size of<u> </u><u>90</u><u> </u> degrees.

Explanation:

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A block oscillating on a spring has a maximum speed of 20 cm/s. part a what will the block's maximum speed be if its total energ

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It will be 4 times of original thus maximum speed would be 80cm/s

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4 years ago

A roller coaster at the Six Flags Great America amusement park in Gurnee, Illinois, incorporates some clever design technology a

sergeinik [125]

Answer:

a)radius of the arc of the teardrop at the top is 10.58m

b)T = mg

c) the centipetal acceleration at the top is 14.5m/s

Explanation:

Part A

Given that roller coaster is of tear drop shape

So the speed at the top is given as

v = 14.4 m/s

acceleration at the top is given as

a = 2 g

$a = 2(9.8) = 19.6 m/s^2$

now we know the formula of centripetal acceleration as

$a = \frac{v^2}{R}\\$

$19.6 = \frac{14.4^2}{R}\\R = 10.58 m$

Part B

now

the total mass of the car and the ride is M

Let the force exerted by the track be n

By Newton law

$n +Mg =\frac{Mv^2}{r} \\\\n=\frac{Mv^2}{r} -Mg\\\\=M(\frac{v^2}{r}-g )\\\\=M(2g-g)\\\\T=Mg$

Part C

If the radius of the loop is 21.4 m

speed is given by same v = 14.4 m/s

now the acceleration is given as

$a = \frac{v^2}{R}$

$a = \frac{14.4^2}{21.4} \\\\= 9.69 m/s^2$

Now for normal force at the top is given by force equation

$F_n + mg = ma\\F_n = m(a-g)$

The force exerted by the rail is less than zero because acceleration is less than 9.69m/s²

So the normal force would have to point away from the centre, For safe ride this normal force must be positive i.e $a \prec g$

$\frac{v^2}{r} \prec \sqrt{g} \\\\v = \sqrt{rg} \\\\v = \sqrt{21.4 \times 9.8} \\\\v = 14.5m/s$

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3 years ago

Acceleration is zero if

tester [92]

It’s doesn’t change meaning it’s 0

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3 years ago

Calculate the pressure exerted on the heel of a boy’s foot if the boy weighs 320 N and he lands on one heel which has an area of

garik1379 [7]

Answer: 2000 Pa

Explanation: Pressure is the amount of force per unit area or

P = F / A

Substitute the given values

P = 320 N / 0.16 m2

= 2000 Pa

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4 years ago

There are many environmental benefits to using nuclear power. One is not an environmental benefit of nuclear power. That is:

FinnZ [79.3K]

The Answer is here
Nuclear energy has no place in a safe, clean, sustainable future. Nuclear energy is both expensive and dangerous, and just because nuclear pollution is invisible doesn't mean it's clean

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4 years ago