2 years ago

Which of the following determines whether light shining on a metal surface will eject electrons from that surface?

1 answer:

8 0

From that list, only the frequency makes the difference.

Einstein won his only Nobel Prize for his explanation of this effect.

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In 2-3 complete sentences, explain why the needle on a compass always points in the direction of magnetic north.

Alex17521 [72]

The needle on a compass always points in the direction of magnetic north because of the magnetic poles of earth. the compass is essentially a magnet itself, so the southern pole of the compass is attracted to the northern pole of earth.

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2 years ago

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A stone is thrown with an initial speed of 12 m/s at an angle of 30o above the horizontal from the top edge of a cliff. If it ta

kherson [118]

Answer:

$d=58m$

Explanation:

From the question we are told that:

Initial Speed $U=12m/s$

Time $T=5.6s$

Angle $\theta=30$

Generally the Newton's equation for motion is mathematically given by

$d=d'+ut+\frac{at^2}{2}$

$d=12cos30*5.6$

$d=58m$

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2 years ago

Which component of a galaxy consists of tiny particles that look smoky or cloudy and

sladkih [1.3K]

Answer:

Cosmic dust

Explanation:

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A 900 kg car travelling at 12 m/s due east collides with a 600 kg car travelling at 24 m/s due north. As a result of the collisi

katrin [286]

Calculate force of each car:

P1 = 900 kg x 12m/s = 10,800

P2= 600 x 24 = 14,400

Degree of travel = arctan(14,300/10800)

Degree of travel = 53.1 N of E

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2 years ago

The ratio between the force of sliding friction and the normal force of an object is called?

Vanyuwa [196]

The answer is the starting friction

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