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4 years ago

A copper wire is stretched so that its length increases and its diameter decreases. As a result:

Physics

1 answer:

slava [35]4 years ago

3 0

Answer: A) False; B) False; C) True; D) False

Explanation: In order to explain this problem we have to take into account the expresion of the resistence of the condutor wire, which os given by:

R=ρ*L/A where ρ, L and A are the resistivity, length and area of the conductor.

As it can be seen, the resitence is inverse to the area so when the diameter decrease the resistance should increase its value. (A, C).

The resistivity does not depend on the length or diameter of the wire, only it depends on the material use to made the wire. (B,C and D).

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A car takes 10 s to go from v = 0 m/s to v = 25 m/s at constant acceleration. If you wish to find the distance traveled using th

german

Initial velocity (u) = 0 m/s

Final velocity (v) = 25 m/s

time taken (t) = 10s

acceleration (a) = ?

Now,

Acceleration is rate of change of velocity, so formula is

a = (v - u)/t

a = (25 - 10)/10

a = 15/10

a = 1.5 m/(s^2)

Use this value of a.

5 0

4 years ago

How does electricity turn into light in a common lightbulb?

Anestetic [448]

Answer:

C or D

Explanation:

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3 years ago

Read 2 more answers

Which statement supports the idea that the Earth rotates on its axis?

Ivenika [448]

Answer:

Explanation:

because the other would not make sense

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3 years ago

A weather forecaster uses a computational model on a Monday to predict the weather on Friday. Why might that forecast change? (1

grandymaker [24]

Answer:

(d) is your answer for your question

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2 years ago

A terrorist throws a grenade with a 6.00 second fuse off a building 150.0 m high at a speed of 10.0 m/s. If the angle at which t

igomit [66]

Here we have a projectile motion. It is type of motion that is made of a vertical shot and a horizontal shot. This is how we will solve it.

Firste step is to find horizontal and vertical component of a speed.
$v_{0x} =v_{0} * cos \alpha$ \\ v_{0y} = v_{0} * sin \alpha [/tex]

We are given this information:
$v_{0} = 10 m/s \\ h=150m \\ \alpha =-30°$
Angle is negative because it is below the horizontal.

VERTICAL SHOT
Time needed for a grenade to fall to the bottom of a building is given by a formula:
$t= \frac{ v_{0y} }{g} \\ t= \frac{v_{0} * sin \alpha}{g} \\ t= \frac{-10*sin(-30)}{9.81} \\ t=0.51s$
We used negative value for a speed because it is considered that upwards shot has positive value and downwards shot has negative value.

The grenade will not explode before it hits the ground.

HORIZONTAL SHOT
<span>The horizontal distance from the building at which the grenade will land is called range. The formula for a range is given by:
</span> $R= v_{0x} * \sqrt{ \frac{2h}{g} } \\ R=v_{0} * cos \alpha* \sqrt{ \frac{2h}{g} } \\ R=10*cos(-30)* \sqrt{ \frac{2*150}{9.81} } \\ R=47.89m$

The grenade will hit the ground at distance of 47.89m.

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3 years ago