A 4768-kg roller coaster train full of riders approaches

What was Laurentia and what lands was it composed of? What happened to it?

snow_lady [41]

Laurentia, also called the North American Craton, is a huge continental craton. It forms the ancient geological core of the continent of North America. It is made up of present day North America and Greenland. About 300 million years ago, it collided with the southern hemispheric continent of Gondwana and formed the supercontinent called Pangaea.

4 0

3 years ago

An attack helicopter is equipped with a 20- mm cannon that fires 87 g shells in the forward direction with a muzzle speed of 853

uysha [10]

Answer

given,

mass of the shell = 87 g = 0.087 Kg

speed of the muzzle = 853 m/s

mass of the helicopter = 4410 kg

A burst of 176 shell fired in 2.93 s

resulting average force = ?

momentum of the shell = m v

= 0.087 x 853

= 74.21 kgm/s

momentum of 176 shell is = 176 p

= 176 x 74.21

= 13060.96

momentum of helicopter = - 13060.96 kgm/s

amount of speed reduce a = $\dfrac{13060.96}{M}$

a= $\dfrac{13060.96}{4410}$

a = 2.96 m/s²

velocity = \dfrac{2.96}{2.93}

v = 1.01 m/s

5 0

3 years ago

Read 2 more answers

A child pulls a wagon with a force F at an angle o with respect to the horizontal. Which of the following free body diagrams is

NeTakaya

Option d) is the correct free body diagram.

Explanation:

A free-body diagram is a diagram that shows all the forces acting on a body. Each force is represented using an arrow, where:

- The length of the arrow is proportional to the magnitude of the force

- The direction of the arrow corresponds to the direction of the force

For the block in this problem, we have the following forces:

- The force F applied from the child, which acts at an angle with respect to the horizontal --> this rules out option a) and c), where the force acts horizontally

- The force of gravity (the weight of the object), labelled with W, which always acts downward --> this rules out option b), since the weight acts downward.

Therefore, the correct option is d).

(in reality, there should be another force: the normal reaction exerted by the floor on the block, N, acting upward).

Learn more about forces and weight:

brainly.com/question/8459017

brainly.com/question/11292757

brainly.com/question/12978926

#LearnwithBrainly

5 0

3 years ago

In the future, a spaceship has traveled three percent of the distance to a space station. If the ship has traveled 2.9 x 10^7 mi

leva [86]

Answer: