1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
balandron [24]
3 years ago
5

A conductor of radius r, length and resistivity ρ has resistance r. what is the new resistance if it is stretched to 4 times its

original length?'
Physics
1 answer:
max2010maxim [7]3 years ago
7 0
The resistance of a conductor is given by
R= \frac{\rho L}{A}
where L is the length of the wire, \rho the resistivity of the material and A the cross-sectional area.

We can see that if all the other quantities do not change, if the new length of the conductor is 4 times the original length: L'=4 L, then the new resistance is also 4 times the original value:
R'= \frac{\rho L'}{A}= \frac{\rho 4 L}{A}=4  \frac{\rho L}{A}=4 R
You might be interested in
If we warm a volume of air, it expands. Does it then follow that if we expand a volume of air, it warms? Explain.
Ivahew [28]

Answer:

nope don't think so

Explanation:

the heat causes the molecules to move faster therefore expanding in watever it the air is in

3 0
3 years ago
Read 2 more answers
If Juan upgrades from a sports car to a large truck, what will happen to the
vovikov84 [41]

Answer:

The force will have to increase

Explanation:

Since Juan has upgraded from a sports car to a large truck, based on Newton's second law of motion, the force needed to keep the truck going at the same speed will have to increase.

 According to Newton's second law "the force on an object is equal to the product of its mass and acceleration".

       Force  = mass x acceleration

A truck has a larger mass compared to a sports car.

By virtue of this, to make sure both automobiles attain the same speed, the force powering them to accelerate must be the same.

 Therefore, the force from the engine must increase.

4 0
2 years ago
7. Which of the following is NOT always true about a synthesis reaction!
Rainbow [258]

Answer:

C

Explanation:

the formula is a + b = ab

5 0
3 years ago
Joe and Max shake hands and say goodbye. Joe walks east 0.50 km to a coffee shop, and Max flags a cab and rides north 3.45 km to
timama [110]

Answer:

3.486 km

Explanation:

Suppose Joe and Max's directions are perfectly perpendicular (east vs north). We can calculate their distance at the destinations using Pythagorean theorem:

s = \sqrt{J^2 + M^2}

where J = 0.5 km and M= 3.45 km are the distances between Joe and Max to their original parting point, respectively. s is the distance between them.

s = \sqrt{0.5^2 + 3.45^2} = \sqrt{12.1525} = 3.486 km

8 0
3 years ago
To determine the pressure in a fluid at a given depth with the air-filled cartesian diver, we can employ Boyle's law, which stat
aniked [119]

Answer:

The pressure at this depth is 1.235\cdot P_{atm}.

Explanation:

According to the statement, the uncompressed fluid stands at atmospheric pressure. By Boyle's Law we have the following expression:

\frac{P_{2}}{P_{1}} = \frac{V_{1}}{V_{2}} (1)

Where:

V_{1}, V_{2} - Initial and final volume.

P_{1}, P_{2} - Initial and final pressure.

If we know that V_{2} = 0.81\cdot V_{1}, then the pressure ratio is:

\frac{P_{2}}{P_{1}} = 1.235

If P_{1} = P_{atm}, then the final pressure of the gas is:

P_{2} = 1.235\cdot P_{atm}

The pressure at this depth is 1.235\cdot P_{atm}.

6 0
3 years ago
Other questions:
  • The amount of gas can affect the pressure of the gas. true or false
    13·1 answer
  • What do you think that astronomers mean when they use the term observable universe?
    15·1 answer
  • During each heartbeat, about 80 g of blood is pumped into the aorta inapproximately 0.2 s. During this time, the blood is accele
    13·1 answer
  • A 50 mm diameter steel shaft and a 100 mm long steel cylindrical bushing with an outer diameter of 70 mm have been incorrectly s
    7·1 answer
  • What is the mechanism that allows species to change over time?
    13·1 answer
  • An object is dropped from a height H. During the final second of its fall, it traverses a distance of 53.2 m. What was H? An obj
    11·1 answer
  • two boxes sit on a frictionless surface and are in contact with one another. the first box has a mass of 7 kg and the second box
    12·1 answer
  • What type of electromagnetic waves will we need to use to complete our discussion-based assessment in the virtual meeting room?
    9·1 answer
  • Write some harms of friction.
    9·2 answers
  • Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 167 cm , but its circumference is decreasi
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!