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2 years ago

A downward force of magnitude 5 n is exerted on the book by the force of.

Physics

1 answer:

MakcuM [25]2 years ago

3 0

Answer:

Gravity (perhaps)

Explanation:

Without a further description or a diagram, I would guess the downward force would be gravity.

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The total number of stars in the observable universe is roughly equivalent to:

musickatia [10]

Answer:

The number of grains of sand on all the beaches on Earth

Explanation:

if we assume grain of sand has an average size , then the number of grains of sand on all the beaches on Earth is roughly $7.5 \times 10^{18}$

The total number of stars in the observable universe is roughly equivalent to 1 billion trillion. which is roughly equal to the number of grains of sand on all the beaches on Earth.

3 0

3 years ago

Karyn is a zookeeper who takes care of baboons. Each day, Karyn writes down how the baboons eat, play, sleep, and wash. She revi

hodyreva [135]

The statement which explains why Karyn's approach is an investigation instead because she is not attempting to change outcomes.

<h3>What is Investigation?</h3>

This is defined as the systematic study of a subject topic and involves various forms of observation.

It however doesn't involve measuring variable as the outcomes aren't changed but only recorded.

Read more about Investigation here brainly.com/question/3897229

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2 years ago

The St. Louis Arch has a height of 192 m. Suppose that a stunt woman of mass 84 kg jumps off the top of the arch with an elastic

Hitman42 [59]

To solve this problem it is necessary to apply the kinematic equations of motion for speed and distance, as well as the concepts related to kinetic energy.

The change in the height of a body subject to gravity is given by

$h = \frac{1}{2} gt^2 \rightarrow t = \sqrt{\frac{2h}{g}}$

Where

h = Height

g =Gravity

t = time

Replacing with our values we have that the time is

$t = \sqrt{\frac{2h}{g}}$

$t = \sqrt{\frac{2(192)}{9.8}}$

$t = 6.25s$

From speed as a function of change between acceleration and time we have then that after 2.6 seconds the speed would be

$g = \frac{v}{t} \rightarrow v = g*t$

$v = 9.8*2.6$

$v = 25.48m/s$

The kinetic energy would be given by

$KE = \frac{1}{2} mv^2$

$KE = \frac{1}{2} (84)(25.48)$

$KE = 1070.16J$

Therefore the kinetic energy after 2.6s is 1070.16J

6 0

3 years ago

A skateboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. How much higher is he when his velocity has red

Taya2010 [7]

Mechanical energy E = mgh + 1/2mv²

When he starts, let h = 0 ⇒ E₁ = 1/2mv₁²
When he reaches height h ⇒ E₂ = mgh + 1/2mv₂²

Without friction, energy is conserved at all times.

E₁ = E₂
↓
1/2mv₁² = mgh + 1/2mv₂²
↓
1/2v₁² = gh + 1/2v₂²
↓
gh = 1/2(v₁² - v₂²)
↓
h = (v₁² - v₂²) / (2g)

5 0

4 years ago

Read 2 more answers

PLEASE HELP

kogti [31]

Answer:

C. nuclear to electrical

6 0

3 years ago

Read 2 more answers