PHYSICS HIGH SCHOOL

What two things do you need to know to describe the velocity of an object?

Answers

Answer 1
Answer:

By definition, we have that the speed of an object is given by:


v = (d)/(t)

Where,

d: distance [in units of length: meters, feet, miles]

t: time [in units of time: minutes, seconds, hours]

Therefore, knowing the distance traveled, and the time to travel this distance, we can know the speed of an object.

Then, since velocity is a vector, then we need the direction of the vector.

Therefore, the velocity vector can be written as:

v = |v|(cos(\alpha) i + sin(\alpha) j)

Answer:

two things you need to know to describe the velocity of an object are:

1) Magnitude (speed)

2) direction

Answer 2
Answer: The distance it traveled and the time that it took to travel that distance

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Jumpering out the resistors in a resistance-controlled three-speed fan will cause the motor toa. run at highest speed.
c. run at lowest speed.
b. run at medium speed.
d. stop immediately

Answers

The answer to the question stated above is letter a. run at highest speed.

Jumpering out the resistors in a resistance-controlled three-speed fan will cause the motor to run at highest speed. If resistors are jumpered, the three-speed fan will over speed and probably burns out.

Please select the word from the list that best fits the definition Scientists who possess this attitude are eager to find answers to different questions they have about the natural world. creativity curiosity honesty skepticism open-mindedness

Answers

Answer:

Curiosity

Explanation:

The word that is more in line with this definition is curiosity, a good scientist is characterized by being extremely curious about the phenomena that surround him, a very clear example of this was Einstein, who said "I have no special talent. I am only passionately curious. "
Curiosity because they are eager to find out information

If a transverse wave of energy travels through the water in this pond ,how wil the floating leaf be moved

Answers

the floating leaf will move up and down but it will remain in horizontal translation equilibrium
Move up and down but stay in the same position

Which of the following best explains why clear-cutting forests is more destructive than selectively cutting down trees in forests?a. Clear-cutting eliminates all trees leaving none behind to maintain soil fertility or house native animals.
b. Clear-cutting places the land at greater risk for wildfires.
c. Clear-cutting makes land more attractive for human development.
d. Clear-cutting causes less soil erosion than selective cutting.

Answers

The answer is a. cutting trees reduce fertility and eliminates animal habitats. Plant material is essential in maintaing soil fertility. Leaves and branches decay to form humus; removing trees decreases the organic content. Trees are home to many animal species, including birds, insects and amphibians. Some trees are even support or home to other plants. Examples include epiphytes in the rainforest ecosystem. Clear cutting forests disrupts whole communities and ecosystems.

400J of heat is produced in 4 sec in 4ohm resistor.calculate yhe PD across the resistor.

Answers

Actually, after the information you gave, I expected you to ask for the voltage
across the resistor, so I'm not quite sure what you mean by 'PD'.  It could be the
"Potential Difference" or the "Power Dissipation" across the resistor.
Here are both answers:

Power Dissipation:
Power = Energy/time =  400 joules / 4 seconds = 100 joules/second = 100 watts.

Potential Difference (voltage):
Power dissipated by a resistor = (voltage)² / Resistance

100 watts = (voltage)² / 4 ohms

Multiply each side by 4 ohms:

400 watts-ohms = (voltage)²

Voltage = square root of 400 watts-ohms = 20 volts

Two point charges are brought closer together, increasing the force between them by a factor of 25. By what factor was their separation decreased? In other words, if r1 is the original separation and r2 is the final separation, what is the ratio r1/r2?

Answers

Answer: 1/5

Explanation: The force between the two charge is inversely proportional to the square distance between charges so as the force increased a factor of 25 the distance can reduced divided by  a factor of 5.

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