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Zina [86]
3 years ago
13

A particular roller coaster has a mass of 3500 kg, a height of 4.0 m, and a velocity of 12 m/s. What is the kinetic energy? If n

eeded, use g= 10. m/s^2
Physics
1 answer:
Alenkinab [10]3 years ago
8 0

Explanation:

given

m=3500kg,h=4.0m,v=12m/s

ke=½mv²

½×3500×12²=3500×144÷2

=252,000j or 252j

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A 0.155 kg arrow is shot upward
Soloha48 [4]

Answer: 244.05 J

Explanation:

To find speed  at 30 m above the ground use equation:

V²=Vo²-2Gs

V0=31.4m/s

s=30m

G=9.81m/s²

-----------------------

V²=31.4²-2*9.81*30

V²=985.96+588.6

V²=1574.56

V=39.68m/s ---speed of arrow on 30 m obove the ground

Use equation for kinetic enrgy:

Ke=mV²/2

m=0.155kg

V=39.68m/s

-------------------------

Ke=0.155kg*(39.68m/s)²/2

Ke=0.155*1574.5/2

Ke=244.05J

6 0
3 years ago
If a force of 32000N exerted pressure of 160N/m² , find the area on which the force acts.​
Alex17521 [72]

Answer: 200m^2

Explanation:

160N=32000N/x

x*160N=32000

x=200m^2

4 0
2 years ago
What would be 1/2 times 800?
IgorLugansk [536]

Answer:

The answer is 400

Explanation:

7 0
3 years ago
Newtons first law states that objects in motion stays in motion until an unbalanced force is acted upon it. what do you think th
EleoNora [17]
Hi Spycn2115


Newton's first law states that objects in motion stay in motion until an unbalanced force is acted upon it is a good fact. When I first personally heard of it in class I had no clue but when I researched it I learned that one good example of this would be those cradle balls and if u swing it, it will keep constantly hitting each other back and fourth over and over until someone grabs it and stops it, so that's what objects in motion stays in motion until an unbalanced force is acted upon it means, because the balls are in motion by moving left to right constantly and its staying in motion by not stopping and that unbalanced force is someone or something maybe hitting it or knocking it over could stop it, balanced means staying still and equal, unbalanced means unstill so moving, the cradle balls are KE and PE, (Kinect and potential energy) because kinetic means moving, so the balls are moving, and potential means stored up, so before u even swing u have the potential energy to swing it different ways before it becomes kinetic. That's one of my favorite examples of Newton's first law and I left you a pic below of cradle balls to help you get the idea.

8 0
3 years ago
A truck has a velocity of 25 m/s and a momentum of 25.000 kg*m/s. What is its<br> mass?
Andrew [12]

Answer:

1000kg

Explanation:

We can use the equation "p=mv"

  • p is the momentum in kg m/s
  • m is the mass measured in kg
  • v is the velocity measured in m/s

If we rearrange the equation to find mass (m), then the equation becomes:

m=p/v

We can substitute in the values of p and v as they are already given in the question.

  • p=25,000 kg m/s
  • v= 25 m/s

So, now we just substitute in the values to get our answer.

m=p/v

m=25,000/25

m=1000kg

3 0
3 years ago
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