PHYSICS HIGH SCHOOL

What statement about a wave produced by a doorbell is true?

Answers

Answer 1
Answer: a wave produced by a door bell is like a soundwave when something or someone hits it. it makes a sound 
Answer 2
Answer:

Answer:

propagates in the form of compression and rarefactions

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A car moves at 12 m/s for 30.0 seconds. It then accelerates at 1.5 m/s2 for 8.00 seconds. Finally, it continues on at this top speed for another 12.0 seconds. Calculate the net displacement during the whole time interval.

A railroad car with a mass of 1.94 ✕ 104 kg moving at 3.28 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.02 m/s. what is the velocity after the collision and the total kinetic energy lost?

Answers

the total cost is going to be 536 kg

A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answers

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.


Whole of ball's initial kinetic energy is converted into potential energy at maximum height.


Thus we can conclude that the kinetic energy is zero at the maximum height.

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward.  At that instant, it has no speed, so its kinetic energy
is zero.

Find the speed of sound in air that is 30.0°C.

350

314

18

Answers

Answer:

v = 350 m/s

Explanation:

The speed of sound depends on the temperature of surrounding. The relation between the speed of sound and the temperature is given by :

v=331+0.61T

Where, T is temperature in Celsius

Here, T = 30 degree Celsius

v=331+0.61* 30

v = 349.3 m/s

or

v = 350 m/s

Therefore, the speed of sound in air at 30 degrees Celsius is 350 m/s.

Answer:

the answer is 350 m/s

Explanation:

Only the component of force perpendicular to the direction motion does work. true or false

Answers

No.  Only the component of force parallel
to the direction of motion does work.

What can be known about the density of sodiumhydroxide?
A. It will be 2.54 g/cm².
B. It will be different from the other chemicals.
C. It will be 1.67 g/cm3.
D. It will be the same as the other reactant.

Answers

d? maybe i’m trying to. see if it’s d or b
It’s D. It will be the same as the other reactant

Whats the answer
----------------------------

Answers

Answer:

repel each other

Explanation:

The magnitude of the charge of an electron is called... ... If a positively-charged glass rod is suspended so that it turns easily and another positively-charged glass rod is brought close to it, the two rods will... Repel each other.

Other Questions
Suppose you have two magnets. Magnet A doesn't have its poles labeled, but Magnet B does have a clearly labeled north and south pole. If these two are brought into contact with one another, which of the following could you expect? A. The side of Magnet A that's attracted to Magnet B's north pole must be Magnet A's north pole. B. The side of Magnet A that's repelled by Magnet B's south pole must be Magnet A's north pole. C. The side of Magnet A that's attracted to Magnet B's south pole must be Magnet A's north pole. D. The side of Magnet A that's repelled by Magnet B's north pole must be Magnet A's south pole
Which is most likely a molecule in a wall-filling material? C6H6 Na6Ba6 NeNa HC
A relationship can be damaged by?
A 92.6 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 735 (food) Calories. How high must the person climb? The acceleration due to gravity is 9.8 m/s 2 and 1 food Calorie is 103 calories. Answer in units of km.