PHYSICS HIGH SCHOOL

A roller coaster cart of mass m = 223 kg starts stationary at point A, where h1 = 26.8 m and a while later is at B, were h2 = 14.7 m. The acceleration of gravity is 9.8 m/s 2 . What is the speed of the cart at B, ignoring the effect of friction?

Answers

Answer 1
Answer:

Answer:

vB = 15.4 m/s

Explanation:

Principle of conservation of energy:

Because there is no friction the mechanical energy is conserve

ΔE = 0

ΔE : mechanical energy change (J)

K : Kinetic energy (J)

U: Potential energy (J)

K = (1/2)mv²

U = m*g*h

Where :

m: mass (kg)

v : speed (m/s)

h : hight (m)

Ef - Ei = 0

(K+U)final - (K+U)initial =0

(K+U)final = (K+U)initial

((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:

((1/2)vB² + g*hB = (1/2 )vA²+ g*hA

(1/2) (vB)² + (9.8)*(14.7) =  0 + (9.8)(26.8 )

(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)

(vB)² = (2)(9.8)(26.8 - 14.7)

(vB)² = 237.16

v_(B) = √(237.16)

vB = 15.4 m/s : speed of the cart at B
Answer 2
Answer:

Answer:

the guy above me is correct

Explanation:

Related Questions

An electromagnetic am band radio wave could have a wavelength of?1) .005m 2) 5m 3) 500m 3) 5,000,000m
Assuming that all carts are moving, compare and contrast the differences in the motion of the 3 carts.
What is intertia? Explain.​
Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity?
What color will a star be with a surface temperature of 5000–6000 K? A. blue B. red C. yellow D. white

A can cause a driver to take risky chances or make bad choices

Answers


-- loud radio
-- heavy rain
-- girl friend in the car
-- misguided sense of privilege or importance
-- misguided sense of immortality

A helicopter flying west begins experiencing an acceleration of 3m/s2 east. Will the magnitude of its velocity increase or decrease?

Answers

The acceleration measures the change in velocity.

Since the acceleration is in the direction opposite to the speed, the velocity eastwards will decrease : its magnitude will first decrease, then it reach 0 m/s, then finally it will increase again.

If a force does not act parallel to the resulting displacement, what is the effect on the work done by the force?

Answers

Then only the component of the force that's parallel to the displacement
is used to calculate the work.  The component of force that's perpendicular
to the displacement  doesn't move through any distance at all, so its contribution
to the total work is zero.

When used as an energy source in a nuclear power plant, uranium is burned in a similar way as one would burn wood or coal for energy. a. True
b. False

Answers

False because nuclear fission is used on uranium in nuclear power station and this reaction is continuous since a neutron hits a uranium atom and splits it. Then 2-3 neutrons are released which continues the cycle or hitting other uranium atoms. If this reaction isn't contained, it could get out of control and become a nuclear bomb. So it can't be burned like wood nor coal.
Hope this is helpful. 

How does friction slow things down?

Answers

Friction slows things down because the force that is created through the interaction between two objects begins to decrease the acceleration and velocity of the object. Therefore, the object begins to slow down. 
friction slows things down because the tiny rough bumps on all surfaces hook on each other and slow down the object and produce heat

A wave travels at a speed of 34 cm/s. It’s wavelength is 18 cm. What is the period of the wave?0.75 s

1.2 s

0.66 s

0.53 s

Regions of compression and rarefaction help define _______.

Electromagnetic waves

Longitudinal waves, but not transverse waves

Transverse waves, but not longitudinal waves

All mechanical waves

Answers

0.53 seconds
(Comment if you need calculations/explanation)

Longitudinal waves but not transverse waves
Other Questions
An electron traveling with a speed of 2.50 × 10^6 meters per second collides with a photonhaving a frequency of 1.00 × 10^16 hertz. After the collision, the photon has 3.18 × 10^−18 joule of energy. Calculate the original kinetic energy of the electron. [Show all work, including the equation and substitution with units.]
Which of the following is true about the action and reaction force referred in Newton's Third Law of Motion? a. I. They have equal magnitude but directed in opposite direction. b. II. They act on the same object simultaneously. c. III. They act on different bodies. d. IV. They act simultaneously.
_______ was the first person to propose the idea of moving continents as a scientific hypothesis. A. Antonio Snider-PelligriniB. Alfred WegenerC. Charles RichterD. Abraham Ortelius
What's the formula to find out power