If there is no friction, the roller coaster would keep moving forever but a constant velocity. The only way it would accelerate is if there was a force continually pushing on it.
Answer:
2 revolutions
Explanation:
Assume that when she runs off the edge of the 8.3m high cliff, her vertical speed is 0. So gravitational acceleration g = 9.8m/s2 is the only thing that makes her fall down. So we can use the following equation of motion to calculate the time it takes for her to fall down:

where s = 8.3 m is the distance that she falls, t is the time it takes to fall, which is what we are looking for


Since she rotates with an average angular speed of 1.6rev/s. The number of revolutions she would make within 1.3s is

Force necessary to support the object on piston 2 is 24× 10⁴ N.
To find the answer, we need to know about the force and pressure on piston 1 and piston 2.
<h3>What's the pressure on piston 2?</h3>
- The force on piston 2= mass × acceleration due to gravity
= 991 Kg × 9.8 = 9414.5N
- Mathematically, force= pressure/area
- Pressure= force × area of piston
= 9414.5N × π(9.46² cm² /4)
= 9414.5N × π(9.46²× 10^(-4)m²/4)
= 66.2 N/m²
<h3>What's the force needed to held the mass on piston 2?</h3>
- Pressure on piston 2 = pressure on piston 1
- Force on piston 1= pressure on piston 1/area of piston 1
= 66.2/ π(1.87² cm² /4)
= 66.2/ π(1.87²×10^(-4)m² /4)
= 24× 10⁴ N
Thus, we can conclude that force necessary to support the object on piston 2 is 24× 10⁴ N.
Learn more about the force and pressure here:
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The characterization of paraffin/ultrasonic-treated diatomite for use as phase change material in thermal energy storage of buildings and it provides the highest surface area with least to no structural degradation.
<h3>
What are the characterization of paraffin/ultrasonic-treated diatomite?</h3>
- Paraffin/ultrasonic-treated diatomite is used as a phase change material or PCM in thermal energy storage of buildings.
- The diatomite is treated multiple times in ultrasonic sound for approximately sixty minutes or DA-60.
- This is done to achieve the optimum condition to improve the surface area.
- When the surface area reaches the highest, the structural degradation reaches minimum.
- 59°C is the melting point of the DA-60 composite phase change material. The latent heat of the same is 45.90
.
- A stable PCM will have proper thermal reliability which is attained through thermal cycling test of 500 cycles.
To learn more about thermal energy, refer to:
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Well the definition is for every action theres is an equal and opposite reaction.