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2 years ago

II. IDENTIFY THE TYPE OF FORCE

Physics

1 answer:

uysha [10]2 years ago

4 0

Answer:

Explanation:

1. Frictional force is responsible for running of car and buses on roads.

2.Gravitational force exists between astronauts in space.

3. Magnetic for is responsible to attract the iron objects using a magnet

4.Electrostatic force is responsible for fiber to stick on the skin.This force occurs due to the presence of charge.

5.When a person is pushing a trolley then object experience a normal reaction from ground.

6.Gravitational force makes the planet to move in their orbits.

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Will mark as brainliest if correct!!!!

Alex787 [66]

Because light travels more quickly in D. glass than in diamond

Explanation:

Refraction is a phenomenon of light waves that occurs when a light way crosses the boundary between two different mediums. When this happens, the wave changes its direction and also its speed. In particular, there is an equation (called Snell's law) that descrives the direction of the refracted ray relative to the incident ray:

$n_1 sin \theta_1 = n_2 sin \theta_2$

where

$n_1, n_2$ are the index of refraction of medium 1 and 2, respectively

$\theta_1$ is the angle of incidence (the angle between the incident ray and the normal to the boundary between the two mediums)

$\theta_2$ is the angle of refraction (the angle between the refraction ray and the normal to the boundary between the two mediums)

The equation can also be written as

$\frac{sin \theta_2}{sin \theta_1}=\frac{n_1}{n_2}$ (1)

The index of refraction of a medium is equal to

$n=\frac{c}{v}$

where

c is the speed of light in a vacuum

v is the speed of light in the medium

Using this, we can rewrite (1) as

$sin \theta_2 = \frac{n_1}{n_2}sin \theta_1 = \frac{v_2}{v_1} sin \theta_1$

where $v_2$ is the speed of light in the 2nd medium and $v_1$ the speed of light in the 1st medium.

Here we are comparing two situations:

1) Light passing from air to glass

2) Light passing from air to diamond

We are said that light is refracted by a greater amount when it passes from air to diamond: this means that in situation 2), the value of $sin \theta_2$ is smaller than in situation 1) (keep in mind that the angle is measured with respect to the normal, so a larger refraction means a smaller angle, since the refracted ray bends towards the normal). And therefore, this means that the ratio $\frac{v_2}{v_1}$ is smaller for case 2) rather than for case 1): since $v_1$ in both cases is the same (the speed of light in air), this means that light travels more quickly in glass than in diamond, so option D.

In fact, by comparison:

Index of refraction in glass: 1.66

Index of refraction in diamond: 2.41

Which means that light travels faster in glass.

Learn more about refraction:

brainly.com/question/3183125

brainly.com/question/12370040

#LearnwithBrainly

4 0

3 years ago

An inductive argument guarantees its conclusion True False

lorasvet [3.4K]

Answer:

False

Explanation:

inductive arguments have some evidence but do not have full assurance of truth of the conclusion

8 0

2 years ago

Read 2 more answers

Help please!

JulsSmile [24]

3. The sum of the players' momenta is equal to the momentum of the players when they're stuck together:

(75 kg) (6 m/s) + (80 kg) (-4 m/s) = (75 kg + 80 kg) v

where v is the velocity of the combined players. Solve for v :

450 kg•m/s - 320 kg•m/s = (155 kg) v

v = (130 kg•m/s) / (155 kg)

v ≈ 0.84 m/s

4. The total momentum of the bowling balls prior to collision is conserved and is the same after their collision, so that

(6 kg) (5.1 m/s) + (4 kg) (-1.3 m/s) = (6 kg) (1.5 m/s) + (4 kg) v

where v is the new velocity of the 4-kg ball. Solve for v :

30.6 kg•m/s - 5.2 kg•m/s = 9 kg•m/s + (4 kg) v

v = (16.4 kg•m/s) / (4 kg)

v = 4.1 m/s

7 0

1 year ago

Who invented the transistor

erma4kov [3.2K]

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.

Some of the earliest work on semiconductor amplifiers emerged from Eastern Europe. In 1922-23 Russian engineer Oleg Losev of the Nizhegorod Radio Laboratory, Leningrad, found that a special mode of operation in a point-contact zincite (ZnO) crystal diode supported signal amplification up to 5 MHz. Although Losev experimented with the material in radio circuits for years, he died in the 1942 Siege of Leningrad and was unable to advocate for his place in history. His work is largely unknown.

Austro-Hungarian physicist, Julius E. Lilienfeld, moved to the US and in 1926 filed a patent for a “Method and Apparatus for Controlling Electric Currents” in which he described a three-electrode amplifying device using copper-sulfide semiconductor material. Lilienfeld is credited with inventing the electrolytic capacitor but there is no evidence that he built a working amplifier. His patent, however, had sufficient resemblance to the later field effect transistor to deny future patent applications for that structure.

German scientists also contributed to this early research. While working at Cambridge University, England in 1934, German electrical engineer and inventor Oskar Heil filed a patent on controlling current flow in a semiconductor via capacitive coupling at an electrode – essentially a field-effect transistor. And in 1938, Robert Pohl and Rudolf Hilsch experimented on potassium-bromide crystals with three electrodes at Gottingen University. They reported amplification of low-frequency (about 1 Hz) signals. None of this research led to any applications but Heil is remembered in audiophile circles today for his air motion transformer used in high fidelity speakers.

4 0

3 years ago

Read 2 more answers

g a small smetal sphere, carrying a net charge is held stationarry. what is the speed are 0.4 m apart

weeeeeb [17]

Complete Question

A small metal sphere, carrying a net charge q1=−2μC, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q2= -8μC and mass 1.50g, is projected toward q1. When the two spheres are 0.80m apart, q2 is moving toward q1 with speed 20ms−1. Assume that the two spheres can be treated as point charges. You can ignore the force of gravity.The speed of q2 when the spheres are 0.400m apart is.

Answer:

The value $v_2 = 4 \sqrt{10} \ m/s$