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3 years ago

The electric eye that prevents an elevator door from closing when you are in the doorway relies upon which physics principle?

2 answers:

5 0

Just took the test as well that dude is right.. lol I rested my grade in your hands and I got an A.. for more help with that test all answers on here are 100% correct: https://quizlet.com/212791759/1007-unit-10-test-part-1-flash-cards/

goblinko [34]3 years ago

3 0

It's Photoelectric Effect, I just a test with this same question. I am not good for explaining exactly how, but I was right.

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What are two conditions of equilibrium? write them in word

valentina_108 [34]

In order for a system to be in equilibrium , two conditions must be met. Net force must be 0.

6 0

3 years ago

A block oscillating on a spring has period T = 2.8 s . (Note: You do not know values for either m or k. Do not assume any partic

olasank [31]

Answer:

Part a)

T = 3.96 s

Part b)

T = 1.98 s

Part c)

T = 2.8 s

Explanation:

As we know that time period of spring block system is given as

$T = 2\pi\sqrt{\frac{m}{k}}$

T = 2.8 s

Part a)

If the mass of the block attached is doubled

then we will have

$T' = 2\pi\sqrt{\frac{2m}{k}}$

$T' = \sqrt2 T$

$T' = 3.96 s$

Part b)

If the spring constant is doubled

then we have

$T' = 2\pi\sqrt{\frac{m}{2k}}$

$T' = \frac{T}{\sqrt2}$

$T' = 1.98 s$

Part c)

If the amplitude is halved but mass and spring constant will remain the same

so here we know that time period does not depends on Amplitude

so we will have

$T = 2\pi\sqrt{\frac{m}{k}}$

T = 2.8 s

7 0

2 years ago

Which change to an object would reduce its potential energy by half?

Triss [41]

Answer:

Explanation:

6 0

2 years ago

Vibrating part of giutar<br>

Bas_tet [7]

Answer:

The Vibrating parts of a Guitar is it's Strings

Explanation:

Guitars are classified in 2 sections: the neck and the body. Strings run through the neck and body of the guitar. When a string is played its vibration is transmitted from the bridge, resonating throughout the top of the guitar.

8 0

2 years ago

Read 2 more answers

A truck collides with a car on horizontal ground. At one moment during the collision, the magnitude of the acceleration of the t

Mice21 [21]

Answer:

The magnitude of the acceleration of the car is 35.53 m/s²

Explanation:

Given;

acceleration of the truck, $a_t$ = 12.7 m/s²