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2 years ago

At what temperature will aluminum have a resistivity that is three times the resistivity copper has at room temperature?

1 answer:

8 0

The temperature that the aluminum will have a resistivity that is three times the resistivity copper has at room temperature is 227°C.

<h3>How to calculate the temperature?</h3>

It should be noted that the temperature of resistivity is given as:

p(t) = p(20°C) (1 + (t - 20°C)

The resistivity at room temperature is illustrated as:

pCu(20°C) = 1.68 × 10^-8

pAl(20°C) = 2.65 × 10^-8

Therefore, the equation will be:

3 × 1.68 × 10^-8 = 2.65 × 10^-8(1 + 0.00435(t - 20°C)

0.902 = 0.00435(t - 20°C)

t = 20 + 207

t = 227°C

Therefore, the temperature is 227°C.

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A 14,700 N car is traveling at 25 m/s. The brakes are applied suddenly, and the car slides to a stop. The average braking force

Vlada [557]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

vo = 25 m/sec
vf = 0 m/sec 
Fμ = 7100 N (Force due to friction) 
Fg = 14700 N 
With the force due to gravity, you can find the mass of the car: 
F = ma 
14700 N = m (9.8 m/sec²) 
m = 1500 kg 
Now, we can use the equation again to find the deacceleration due to friction: 
F = ma 
7100 N = (1500 kg) a 
a = 4.73333333333 m/sec² 
And now, we can use a velocity formula to find the distance traveled: 
vf² = vo² + 2a∆d 
0 = (25 m/sec)² + 2 (-4.73333333333 m/sec²) ∆d 
0 = 625 m²/sec² + (-9.466666666667 m/sec²) ∆d 
-625 m²/sec² = (-9.466666666667 m/sec²) ∆d 
∆d = 66.0211267605634 m 
∆d = 66.02 m

7 0

4 years ago

What must be true about two objects if heat is flowing between them

Vedmedyk [2.9K]

Answer:

The objects must be different temperatures.

Explanation:The objects must be different temperatures. eat will flow from Object 1 to Object 2 in examples 1, 2, and 4, and heat will flow from Object 2 to Object 1 in Example 3. Which factors affect heat transfer between a warm and a cool substance?

4 0

2 years ago

Read the scenario and solve these two problems.

Burka [1]

Answers:

a) 5400000 J

b) 45.92 m

Explanation:

a) The kinetic energy $K$ of an object is given by:

$K=\frac{1}{2}mV^{2}$

Where:

$m=12000 kg$ is the mass of the train

$V=30 m/s$ is the speed of the train

Solving the equation:

$K=\frac{1}{2}(12000 kg)(30 m/s)^{2}$

$K=5400000 J$ This is the train's kinetic energy at its top speed

b) Now, according to the Conservation of Energy Law, the total initial energy is equal to the total final energy:

$E_{i}=E_{f}$

$K_{i}+P_{i}=K_{f}+P_{f}$

Where:

$K_{i}=5400000 J$ is the train's initial kinetic energy

$P_{i}=0 J$ is the train's initial potential energy

$K_{f}=0 J$ is the train's final kinetic energy

$P_{f}=mgh$ is the train's final potential energy, where $g=9.8 m/s^{2}$ is the acceleration due gravity and $h$ is the height.

Rewriting the equation with the given values:

$5400000 J=(12000 kg)(9.8 m/s^{2})h$

Finding $h$ :

$h=45.918 m \approx 45.92 m$

7 0

3 years ago

Read 2 more answers

Four solutions are prepared in beakers. In all solutions, 20 g of sugar are added to 100 ml of water. Beaker A is placed on the

Illusion [34]

Hot water then room temp water then cold water

8 0

3 years ago

If you are driving an oscillatory system at a certain frequency, but the amplitude is much smaller than it could be, you can be

kakasveta [241]

Answer:

3. The driving frequency is not matched to the natural frequency of the oscillatory system.

Explanation:

It is the condition of resonance when the one body that oscillates with a maximum amplitude when the frequency of the applied force is equal to the natural frequency of the body.

Every body has its own natural frequency.

Here the driving force may be more or less but we are sure that it is not equal to the natural frequency of oscillatory system. Hence the force is not in resonance with the oscillatory system.

5 0

3 years ago