PHYSICS HIGH SCHOOL

What is the time required for an object startingfrom rest to fall freely 500. meters near Earth’s
surface?
(1) 51.0 s (3) 10.1 s
(2) 25.5 s (4) 7.14 s

Answers

Answer 1
Answer:

The time required for an object starting from rest to fall freely 500. meters near Earth’s is 10.1 s

Without air resistance Distance  =  1/2 g T²

500 m  =  (1/2) (9.8 m/s²) (T²)

 500 m  =  (4.9 m/s²) (T²)

Divide each side by   (4.9 m/s²)  

T²  =  (500 m) / (4.9 m/s²)

= 102.04 s²

T  =  √ (102.04 s²)

T =  10.1 seconds

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Answer 2
Answer: (3) 10.1 second Using equation of motion 500 = (0.5)(9.81)t^2. Rearranging, t = sqrt(1000/9.81) = 10.1s

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A lamp can work on 50V mains taking 2 amps. What value of resistance must be connected in series with it, so that it can be operated from 200V mains giving the same power?

Answers

The resistance of the lamp is apparently  50V/2A  =  25 ohms.

When the circuit is fed with more than 50V, we want to add
another resistor in series with the 25-ohm lamp so that the
current through the combination will be 2A.

In order for 200V to cause 2A of current, the total resistance
must be      200V/2A = 100 ohms.

The lamp provides 25 ohms, so we want to add another 75 ohms 
in series with the lamp.  Then the total resistance of the circuit is
(75 + 25) = 100 ohms, and the current is 200V/100 ohms = 2 Amps.

The power delivered by the 200V mains is (200V) x (2A) = 400 watts.

The lamp dissipates ( I² · R ) = (2² · 25 ohms) = 100 watts.

The extra resistor dissipates  ( I² · R) = (2² · 75 ohms) = 300 watts.

Together, they add up to the 400 watts delivered by the mains.

CAUTION:
300 watts is an awful lot of power for a resistor to dissipate !
Those little striped jobbies can't do it. 
It has to be a special 'power resistor'. 
300 watts is even an unusually big power resistor.
If this story actually happened, it would be cheaper, easier,
and safer to get three more of the same kind of lamp, and
connect THOSE in series for 100 ohms.  Then at least the
power would all be going to provide some light, and not just
wasted to heat the room with a big moose resistor that's too
hot to touch.

If a 3 kg object has a momentum of 33 kg ms whats its velocity?

Answers


Momentum = (mass) x (speed)

  33 kg-m/s = (3 kg) x (speed)

Divide each side by  3 kg :

   (33 kg-m/s) / (3 kg) = speed

         11 m/s                = speed

(You asked for velocity, but didn't give us any information about the direction
in which the object is moving.  So we can only work with the speed.)


Why is gravity an example of scientific law?

Answers

Gravity can be an example of scientific law because of the fact that it has been proven over and over, again and again. While a theory is proven by evidence, it can be disproved. Laws rarely change. Although there are theories about gravity as well. The difference is a theory explains why it happens while a law lets us calculate a way to find what happened. In Newton's Law of Universal Gravitation, the formula will allow you to calculate the gravitational pull of the Earth and what ever you dropped for instance. However Einstein's Theory of General Relativity explains why whatever you dropped fell. So it depends what you mean by gravity being a law. It can be both depending on if your using it to prove something or to explain why that force occurs. :)

Because it is a basic concept that defines a constant and universal behaviour of nature, gravity is seen as an illustration of a scientific law.

Scientific laws are succinct formulations that precisely explain a natural occurrence and are the result of in-depth observation and investigation. Einstein's theory of general relativity or Newton's law of universal gravitation both use the concept of gravity to explain how mass-containing objects interact with one another in space.

It offers a mathematical framework that enables researchers to perform precise projections and estimates about celestial body motion, the behaviour of things close to the surface of the Earth, and the structure of the cosmos.

The fact that gravity is recognised as a scientific rule is a reflection of the fact that it is widely accepted and has been shown to have practical applications.

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As a wave moves through a medium, particles are displaced and

Answers

And return to their normal position after the wave passes.
particles are displaced from their equillibrium position. They in turn displace neighbouring particles and then get back to their original postion.

On the Celsius scale, one degree indicates the same temperature change as A. one degree Fahrenheit.
B. 5/9 degree Fahrenheit.
C. one kelvin.
D. 9/5 kelvin.

Answers

Choice  ' C '  is the only correct one.

The Celsius degree and the Kelvin are also the
same size as 9/5 (1.8) Fahrenheit degrees.
D)   9/5 kelvin is WRONG 

If a wave has a frequency of 2 Hz. what is the period

Answers

The period is the reciprocal of the frequency ... ' 1 ' divided by it.

 P = 1/f = 1 / (2 per second)  =  1/2 second
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