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Inessa [10]
1 year ago
6

Which of the following objects have kinetic energy?

Physics
1 answer:
Montano1993 [528]1 year ago
4 0
I think the Answer is A (An elephant walking 1.5 m/s along the ground), and B (A jet flying across the sky 4,000 m above the ground.
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Ask Your Teacher A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 33.5° and the ang
Oduvanchick [21]

Answer:

The critical angle for the liquid when surrounded by air is 30 degrees.      

Explanation:

Given that,

The angle of incidence is 33.5° and the angle of refraction is 19.3°. Firstly, we can find the refractive index of the liquid. It can be calculated using Snell's law as :

n=\dfrac{\sin i}{\sin r}\\\\n=\dfrac{\sin (33.5)}{\sin (19.3)}\\\\n=2

The critical angle is given by :

\theta_c=\sin^{-1}(\dfrac{n_1}{n_2})

Here, n_1 is refractive index of air and n_2 is refractive index of liquid.

\theta_c=\sin^{-1}(\dfrac{1}{2})\\\\\theta_c=30^{\circ}

So, the critical angle for the liquid when surrounded by air is 30 degrees.

5 0
4 years ago
__________ brake systems release the brakes momentarily when wheel speed sensors indicate a locked wheel during braking and trac
chubhunter [2.5K]

"Anti-Lock" brake systems release the brakes momentarily when wheel speed sensors indicate a locked wheel during braking and traction.

<u>Explanation:</u>

The safety anti-skid braking system is known as "anti-lock braking system" having huge application on land vehicles like one, two and multiple wheeler vehicles and aircraft. During braking, it avoids wheels to get locked by building tractive contacts to the road's surface.

This seems to be an automated system work on the principles of techniques - threshold and cadence braking. The wheel velocity sensors are utilized by ABS to find whether one or more than one wheels chose to get lock while braking.

5 0
3 years ago
Read 2 more answers
What is the heat source for rock formation​
Otrada [13]

Answer:

Explanation:

The heat source for rock formation

Primordial heat: Some heat accumulated during the earth's formation and it is still available to drive the internal heat Engine of the earth. Some of these heat are used to melt rocks and produce magma.

Radioactive sources: Radioactive elements within the earth also serves as heat source for rock formation. Their spontaneous decay produce heat which are sufficient enough to generate enough thermal energy to melt and produce rocks.

6 0
4 years ago
How does fabric softener help prevent static electricity?
algol13

Answer:

Dryer sheets stop static cling by absorbing static electricity formed by different fabrics during your dryer cycle. The fabric softeners that coat dryer sheets are positively charged ions to balance the electrons and ions that cause static cling, leaving you with soft clothes without the static.

Explanation:

3 0
2 years ago
Excited hydrogen atoms radiate energy in the _________
sveticcg [70]

Answer:

infrared, visible and ultraviolet regions.

Explanation:

7 0
3 years ago
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