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sasho [114]
2 years ago
9

1. Potential energy and a roller coaster. A 1000-kg roller coaster car moves from point A to B then C.

Physics
1 answer:
zalisa [80]2 years ago
8 0

Answer:(a) With our choice for the zero level for potential energy of the car-Earth system when the car is at point B ,

          U

B

​

=0

When the car is at point A, the potential energy of the car-Earth system is given by

          U

A

​

=mgy

where y is the vertical height above zero level. With 135ft=41.1m, this height is found as:

y=(41.1m)sin40.0

0

=26.4m

Thus,

U

A

​

=(1000kg)(9.80m/s

2

)(26.4m)=2.59∗10

5

J

The change in potential energy of the car-Earth system as the car moves from A to B is

U

B

​

−U

A

​

=0−2.59∗10

5

J=−2.59∗10

5

J

(b) With our choice of the zero configuration for the potential energy of the car-Earth system when the car is at point A, we have U

A

​

=0. The potential energy of the system when the car is at point B is given by U

B

​

=mgy, where y is the vertical distance of point B below point A. In part (a), we found the magnitude of this distance to be 26.5m. Because this distance is now below the zero reference level, it is a negative number.

Thus,

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anastassius [24]

The electric field created by Q at the position of q is \frac{F}{Q}.

The given parameters:

  • <em>Magnitude of charge, = q</em>
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The electric field created by Q at the position of q is calculated as follows;

E = \frac{F}{Q} \\\\

where;

  • <em>E is the magnitude of electric field strength </em>
  • <em>F is the force experienced by both charges</em>
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Thus, the electric field created by Q at the position of q is \frac{F}{Q}.

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7 0
3 years ago
Consider the three inclines shown in the figure. The vertical line is an incline with a 90° angle. (Inclines with 90° angles do
const2013 [10]

The final speed of C is equal to that of B.

The travel time of A is less than that of B.

The final speed of B is equal to that of A.

The travel time of C is greater than that of B.

The final speed of A is equal to that of C.

The travel time of C is greater than that of A.

<h3>What is speed?</h3>

The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.

Consider the three inclines shown in the figure (attached below). The vertical line is an incline with a 90° angle. All three inclines are frictionless. Three small identical objects are released from the top of the inclines.

When the objects are at the same height, they travel with the same height. The travel time is directly proportional to the incline.

Thus, all the statements are completed.

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4 0
3 years ago
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RoseWind [281]

Answer:

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Explanation:

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Describe how the boiling point of water on top of a mountain would be different from its boiling point at sea level.
Sonbull [250]

Answer:

At elevated altitudes, any cooking that involves boiling or steaming generally requires compensation for lower temperatures because the boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure.

Explanation:

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The fundamental frequency of a standing wave on a 1.0-m-long string is 440 Hz. What would be the wave speed of a pulse moving al
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Answer: v = 880m/s

Explanation: The length of a string is related to the wavelength of sound passing through the string at the fundamental frequency is given as

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But L = 1m

1 = λ/2

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V = fλ

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