The change in pitch of a train's horn as it passes while you are standing still can be explained bya. sympathetic vibration.
b. ultrasonic vibrations.
c. resonance.
d. the Doppler effect.

Answers

Answer 1

Answer:
The change in pitch of a train's horn as it passes while you are
standing still can be described by the Doppler effect, but that
doesn't explain it.

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Which of the following is not a possible effect of rising carbon dioxide levels on plants?
A hollow plastic sphere is held below the surface of a fresh-water lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.650 cubic meters and the tension in the cord is 900 N. a) Calculate the buoyant force exerted by the water on the sphere. b) what is the mass of the sphere? c) the cord breaks and the sphere rises to the surface. When the sphere comes to rest, what fraction of its volume will be submerged?
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A wagon is pulled at a speed of 0.40metets/seconds by a horse exerting an 1,800 Newton's horizontal force. what is the power of this horse?

Answers

Given:

speed of 0.40meters/seconds

1,800 Newton's horizontal force

Required:

Power of the horse

Solution:

P = F(D/T) where P is power in watts, F is the force, D is the distance and T is time

P = (1,800N) (0.40 meters/seconds)

P = 720 Watts

Which of the items has the least inertia while at rest? A. penny. B. airplane. C. frog. D. dog.

Answers

Answer:

A penny

Explanation:

A girl who is watching a plane fly tells her friend that the plane isn’t moving at all. Describe a frame of reference in which the girl’s description would be true

Answers

In the frame of reference of the passengers, flight attendants,
pilot ... anybody ON the plane ... the plane isn't moving at all.

A scientist is conducting research to determine how much pressure a dam can withstand. Why are good observations important to his research?

Answers

The things that a scientist should consider while observing the force is the environmental conditions,the force that is expected to act on the dam, the means to contain that force, and compare different types of designs in accordance with the location of the dam

Which lists the springs based on the amount of elastic potential energy from greatest to least

Answers

The elastic potential energy stored in the spring is

= (1/2) x (spring constant) x (distance stretched or compressed)²

If all four springs are stretched or compressed the SAME distance
from their equilibria, then the potential energy is just proportional
to the spring constant.

From greatest to least stored energy is exactly the same list as
from greatest to least spring constant:

X . . . . . 35
W . . . . . 24
Y . . . . . 22
Z . . . . . 15

The following list, which ranks stored energy from highest to lowest, also ranks spring constant from highest to lowest: X, W, Y, Z. Hence, option B is correct.

What is potential energy?

Potential energy is a form of stored energy that is dependent on the relationship among different components. When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the floor as opposed to falling to the ground, it has more potential energy. It is capable of carrying out additional work when raised.

Potential energy is a feature of systems rather than of particular bodies or particles; for instance, the system created up of Earth and the elevated ball has more energy stored as they become further apart.

Potential energy develops in systems components whose configurations, or spatial arrangement, determine the amount of the forces they apply to one another.

The spring's potential elastic energy is stored as:

= (1/2) x (spring constant) x (distance compressed or stretched)²

So, the order from greatest to least will be:

X = 35

W = 24

Y = 22

Z = 15

To know more about Potential energy:

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When a speeding truck hits a stationary car, the car is deformed and heat is generated. What can you say about the kinetic energy of the system after the collision?

Answers

I can say that the kinetic energy after the collision is less than it was before the collision. I can say this with confidence because you've said that some energy was used to deform the car, plus there was energy lost from the system in the form of heat.

Answer:

B. The kinetic energy of the system is partially used for deforming the car.

Explanation:

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