PHYSICS HIGH SCHOOL

The​ time, t, required to drive a fixed distance varies inversely as the​ speed, r. It takes 9 hr at a speed of 20 ​km/h to drive a fixed distance. How long will it take to drive the same distance at a speed of 23 ​km/h?

Answers

Answer 1
Answer:

Answer:

Time=7.84hrs

Explanation:

This is an inverse proportionality questions

Mathematically time t varies as 1/distance d

Hence T= dk/r

But speed r = distance/t

d= r*t= 9*20=180km/hr

We're k= constant of proportionality

At t=9hrs d=180km/hr

Hence k=r*t/d=20*9/1620=0.111

Finding t at at 1620km for 23km/hr

t=1620*0.111/23=7.84hrs

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B. a liquid.
C. an elastic material.
D. a vacuum.

Answers

They cannot travel through D a vacuum. They need a solid, liquid or gas to travel
D. a vacuum is the correct answer.

Because there are no particles in vacuum to transfer sound waves.

What are the requirements for an inertial frame of reference?

Answers

As simply put as I believe is possible, it's the immediate space-time co-oridinate in which the observer is not in motion. All measurements by the observer are in relation to that 'place'

Which most likely could cause acceleration? Check all that apply.a flat road
wind
water movement
a hill
a stop light
*can be multiple answers*

Answers

Answer  

Wind  

Water movement  

A hill

Explanation.  

The question does not specify it is the acceleration of what is to be accelerated. So my answer will be general. Acceleration is the change of velocity with time.  

Wind can cause acceleration of sound. If the sound is travelling in the direction of sound, its speed wound increase. The reverse is also true.  

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Which of these features is NOT found on the ocean floor? A. mountain
B. volcano
C. river
D. plain

Answers

C. River

Hope I helped:P 
There are two reasons why river isn't on the ocean floor, for one, the sea is saltwater, meanwhile rivers are usually fresh water heading to the ocean, and why would rivers be underwater if there's ALREADY water on the sea floor

Voltage sources are used to sustain a. the flow of protons
b. chemical reactions
c. resistance
d. the movement of electric charge

Answers

Answer:

d. the movement of electric charge

Explanation:

Voltage source is used to provide constant voltage difference across the ends of a given conductor where it is connected

Now when voltage source is connected across the conductor we can say that due to constant voltage difference there would be a constant current will maintain in the conductor

It is given by

i = (\Delta V)/(R)

now since the voltage difference and resistance both are constant so current will be same in the circuit

So here the flow of charge will remain constant due to voltage source

So correct answer would be

d. the movement of electric charge
the movement of electric charge

Humans and animals alike have critical periods of development.true false

Answers

Answer: True

Explanation:

Human beings and animals both have their critical time period of development and if they fail to learn things at that time then they fail to learn it for the rest of their life.

The development period of the animals and human beings starts after the birth when a person starts learning and development.

Example:  If a bird does not learns to sing at the critical periods then it will not learn it the whole life.
True, both humans and animals alike do have critical periods of development
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