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3 years ago

1) A common surface feature on the terrestrial planets is

1 answer:

5 0

<span>1. A common surface features on the terrestrial planets is ___________.

Answer: A. Mountains and B. Volcanoes

2. Which scientist determined the planet's orbital shapes and sizes by triangulation?

Answer: C. Kepler

3. Scientists used the Keck telescope to learn more about the ______ located at the center of the Milky Way galaxy

Answer: A. star cluster

4. When the solar system formed, planetesimals collided and merged to form

Answer: A. Protoplanets

5) How is the heliocentric model of the solar system different than the geocentric model?

Answer: D. The heliocentric model has planets going around the sun; the geocentric model has planets going around Earth.</span>

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When a sound wave encounters a barrier, what happens?

Tema [17]

Sound waves will either be reflected (echo effect) or absorbed (dissipated) depending upon the material make-up of the barrier

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3 years ago

Jack and Jill are on two different floors of their high rise office building and looking out of their respective windows. Jack s

Maru [420]

Answer:

a) speed when Jack sees the pot : 12.92 meters per second

b) height difference 163.115 meters

Explanation:

First to calculate te initial speed we use the acceleration formula:

a= v1-v0/t

Acceleration being gravity's acceleration (9.8 m/s^2)

v1 being the speed when Jill sees the pot

v0 when Jack sees it

and t the time between

Solving for v0 it would be

v1 - a*t = v0

replacing

$58 m/s - 9.8 m/s^2 *4.6 s = v0 = 12.92 m/s$

For the second question we use the position formula setting y0 and t0 as the position and time when jack sees the pot. (and setting the positive axis downward I.E. one meter below jack would be 1m not -1m)

The formula is

$y0 + v0*t + 1/2 g *t^2 = yt$

replacing

$0m + 12.92m/s* 4.6 s + 1/2 * 9.8 m/s^2 * (4.6 s)^2 = 163.115 m$

5 0

3 years ago

A football is thrown vertically with an initial velocity of 33m/s. Calculate the velocity of the ball when it’s height increased

tatyana61 [14]

The final velocity becomes 31.48 m/s

<u>Explanation:</u>

Given:

Initial velocity, u = 33 m/s

Height, h = 5m

Final velocity, v = ?

According to Newton's law:

v² - u² = 2gh

where,

g is the acceleration due to gravity and

g = 9.8 m/s²

On substituting the values we get:

$v^2 - (33)^2 = 2 X -9.8 X 5\\\\v^2 - 1089 = -98\\\\v^2 = 991\\\\v = 31.48 m/s$

Therefore, the final velocity becomes 31.48 m/s

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3 years ago

Clarify this statement acceleration due to gravity of the Earth is 9.8m/s square

muminat

Answer:

it means that velocity of a body rises by 9.8m/s each second if the air resistance is nrelated

mark me

3 0

3 years ago

During the exchange of air in your lungs oxygen is being taken into your bloodstream while this substance is being released

pickupchik [31]

Answer:

carbon dioxide

Explanation:

8 0

2 years ago