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3 years ago

I need some help with this,, anyone??It's has three parts so... (9A), (9B), and (9C)

Physics

1 answer:

Readme [11.4K]3 years ago

5 0

A is 588N.

b) When she reaches her terminal speed, 10 seconds into the dive, she is no longer accelerating, so the net force on her is zero.
Think of it this way: If the net force were not zero she would continue to accelerate.

c) She is no longer accelerating.
Her acceleration is zero.

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A child with a weight of 110 N swings on a playground swing attached to 2.00 m long chains. What is the gravitational potential

Ierofanga [76]

Answer

given,

Weight of the child = 110 N

length of the swing,L = 2 m

now, calculating the potential energy when the string is horizontal

Potential energy = m g h

now, h = L (1 - cos θ) where θ is the angle made by the string with the vertical.

PE = m g L (1 - cos θ)

when rope is horizontal θ = 90°

PE = 110 x 2 (1 - cos 90°)

PE = 220 J

now, calculating potential energy when string made 25° with horizontal

PE = m g L (1 - cos θ)

when rope is horizontal θ = 25°

PE = 110 x 2 (1 - cos 25°)

PE = 20.61 J

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4 years ago

A roller coaster moving down a hill is an example of what kind of energy

GalinKa [24]

That would be kinetic energy

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3 years ago

Read 2 more answers

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. The egg just misses the cornice on t

diamong [38]

Answer:

1. 18.5m/s

2. 17.5 m

3. 0 at its highest point

4. Direction is downwards

Explanation:

1. This egg is thrown vertically from a height

Yo = 0. This egg then falls to the point y = -30.0 at t = 5seconds

Y-Yo = V0t - 1/2gt²

-30-0 = V0(5)-1/2(9.8)(5²)

-30 = 5v0 - 4.9x25

-30 = 5V0 - 122.5

-30+122.4 = 5v0

V0 = 92.5/5

= 18.5m/s

this is the initial speed of the egg

2. When the egg is at a maximum height it would have a velocity equal to 0

V² = V0² - 2*g*y

V = 0, V0 = 18.5, g = 9.8

0 = 18.5²-2x9.8*y

342.25-19.6y = 0

342.25 = 19.6y

Divide through by 19.6

Y = 342.25/19.6

Y = 17.5m

this value is how high it rises above starting point

The magnitude of velocity is = 0 at its highest point

This egg falls under gravity. Therefore the acceleration due to gravity has a constant magnitude and direction. Magnitude = 9.8m/s and it's direction is downwards.

5. Please check attachment for graph

6 0

3 years ago

A current of 1.4 A flows in a conductor for 7.0 s. How much charge passes a given point in the conductor during this time?

bija089 [108]

Answer:

The charge passes a given point in the conductor during this time is 9.8 C.

Explanation:

Given that,

Current = 1.4 A

Time = 7.0 sec

We need to calculate the charge during this time

Charge :

Charge is the product of current and time.

In mathematically form,

$Q = i\times t$

Where, i = cirrent

t = time

Put the value into the formula

$Q =1.4\times7.0$

$Q=9.8\ C$

Hence, The charge passes a given point in the conductor during this time is 9.8 C.

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3 years ago

In each cycle, a heat engine performs 710 J of work and exhausts 1480 J of heat. What is the thermal efficiency?

Brrunno [24]

Answer:

D) 0.32

Explanation:

The computation of the thermal efficiency is given below:

Thermal efficiency is

= 710 J ÷ (710 J + 1480 J)

= 710 J ÷ 2,190 J

= 0.32

Hence, the thermal efficiency is 0.32

Therefore the last option is correct

5 0

3 years ago