PHYSICS MIDDLE SCHOOL

Spaceship 1 and Spaceship 2 have equal masses of 300kg. They collide. Spaceship 1's final speed is 3 m/s, and Spaceship 2's final speed is 2 m/s in the same direction. What is their combined momentum? A. 600 kg-m/s B. 1,500 kg-m/s C. 1,200 kg-m/s D. 900 kg-m/s

Answers

Answer 1

Answer:

Answer:

B. 1500 kg*m/s

Explanation:

Momentum p = m* v

In any type of collision, the total momentum is preserved!

The total momentum before and the total momentum after the collision is the same. We know the mass and speed after the collision so we can calculate the total momentum.

p1 + p2 =

m1*v1 + m2*v2

m1 = me = 300 kg

v1 = 3 m/s

v2 = 2 m/s

Substitute the given numbers:

300*3 + 300+2

900 + 600

1500 kg*m/s, which is answer B.

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Explain how inertia and the shape of a loop counteract the force of gravity to keep riders from falling out when a roller coaster goes through a loop traveling upside down

Answers

When a roller coaster car goes through a loop, inertia keeps it from being pulled down by gravity. Inertia is the tendency of an object to resist a change in its motion, meaning that an object (the roller coaster car) which is already moving will resist forces that try to stop it. It will continue to try to move in a constant speed in a constant direction, even if other forces are slowing it down. The shape of the loop in a roller coaster is made so that the car can travel up it without losing its momentum. This is why a roller coaster car needs to be travelling at high speeds to go through a loop. If it weren't travelling quickly enough, the forces of gravity would pull it down before it could make it all the way through the loop.

1.In what type of wave is the vibration perpendicular to the direction of travel of the wave. ____2.What type of wave vibrates p,arallel to the direction of travel? ______

3.What type of wave contains compressions and rarefactions? _____

4.What type of wave is produced when you move one end of a horizontal spring up and down?_____

5.What type of wave has a wavelength? ____

Answers

Q 1. In transverse waves the vibration is perpendicular to the direction of travel.

Q 2. In longitudinal waves the vibration is parallel to the direction of travel.

Q 3. Longitudinal waves contain compressions and rarefactions when they travel around.

Q 4. A transverse wave is produced when you move one end of a

horizontal spring up and down.

Q 5. Every type of wave has a wavelength.

1. The vibration is perpendicular to the direction of travel of transverse waves.

2. The vibration is parallel to the direction of travel of longitudinal waves.

3. Compression waves contain compressions and rarefactions.
They are longitudinal waves.

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What does aliens need to survive on Jupiter?

Answers

If you only asked me what does an animal need to survive in my house,
I couldn't answer that one either, until you tell me what animal you're
talking about.

Now you want to talk about aliens, of which #1): We have no evidence
that they even exist, and #2): If they do exist,we have no idea what kind
of a planet they live on, and #3): We have no idea what the environment
might be like on that planet.

So, to answer your question, I would say this:

In order to survive on Jupiter, an alien species would need exactly the
same things that Earthly humans would need there ... They would need
some set of materials and devices that could be used to duplicate the
conditions of atmosphere, temperature, pressure, gravitation, and
radiation in which their species evolved and to which it adapted, in
whatever place they came from.

I dont believe that there is aliens so they need nothing to survive because they arent real. But that is my opinion. Scientist say they are but in my belief i think they just saying that to get known.

A particle is moving in a circular path of radius r . The displacement after half a circle would be

Answers

Answer:

Explanation:

As we know that

The displacement is the total distance measured between the initial or start and final or destination point

If particle cover half path of the circle, the displacement can easily find out by considering the distance between the start and destination point

We attached the diagram for better understanding

As per the diagram.

The displacement after half-circle is

AB = OA + OB

= r + r

= 2r

If you are driving 128.4 km/h along a straight road and you look down for 3.0s, how far do you travel during this inattentive period?

Answers

Answer:

107 m

Explanation:

Convert km/h to m/s:

128.4 km/h × (1000 m / km) × (1 h / 3600 s) = 35.67 m/s

Distance = rate × time

d = 35.67 m/s × 3.0 s

d = 107 m

When is an object moving in uniform circular motion?

Answers

Answer: An object undergoing uniform circular motion is moving

Explanation:

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