All categories

4 years ago

How an elastic material can no longer be elastic but plastic instead?

1 answer:

3 0

<span><span>deformação elástica – é aquela em que removidos os esforços atuando sobre o corpo, ele volta a sua forma original</span><span>deformação plástica – é aquela em que removidos os esforços, não há recuperação da forma original.</span></span>

You might be interested in

Sulfur hexafluoride is represented by which formula? A) sf2 b) sf7 c) s2f5 d) sf6

Margarita [4]

Since hex means 6 from Greek, the answer is D) SF6

4 0

3 years ago

Read 2 more answers

Starting from rest, a dragster travels a straight 1/4 mi racetrack in 6.70 s with constant acceleration. What is its velocity wh

Airida [17]

<h2>Its velocity when it crosses the finish line is 119.40 m/s</h2>

Explanation:

We have equation of motion s = ut + 0.5 at²

Initial velocity, u = 0 m/s

Acceleration, a = ?

Time, t = 6.70 s

Displacement, s = 1/4 mi = 0.25 mi = 400 m

Substituting

s = ut + 0.5 at²

400 = 0 x 6.70 + 0.5 x a x 6.70²

a = 17.82 m/s²

Now we have equation of motion v = u + at

Initial velocity, u = 0 m/s

Final velocity, v = ?

Time, t = 6.7 s

Acceleration, a = 17.82 m/s²

Substituting

v = u + at

v = 0 + 17.82 x 6.7

v = 119.40 m/s

Its velocity when it crosses the finish line is 119.40 m/s

6 0

3 years ago

Why does an object in motion stay in motion unless acted on by an unbalanced force?

Svet_ta [14]

Answer: A) because forces are what stop and start motion

Explanation:

From Newton's first law, an object tends to stay in state of rest or motion unless acted upon by an unbalanced external force. This is also known law of inertia. This is because a force can stop or start a motion. A force cause body to accelerate to decelerate otherwise the body continues with constant speed.

7 0

3 years ago

Read 2 more answers

A 50-ohm resistor in a 0.5 Amp circuit produces how much voltage drop?

ahrayia [7]

25 volts

Explanation:

Use Ohm's law to find the potential drop:

V = IR

= (0.5 A)(50 ohms)

= 25 volts

6 0

3 years ago

a straight, 2.5-m wire carries a typical household current of 1.5 a (in one direction) at location where the earth's magnetic fi

kotykmax [81]

Answer:

The magnitude of the force is $F=2.1*10^{-4}N$

The direction is from south to north i.e upward

The magnitude of the force is $F=2.1*10^{-4}N$

The direction is towards the west

The magnitude of the force is $F=2.1*10^{-4}N$

the direction of the magnetic field is parallel to the direction of the current (south to north ) hence the direction in 0 in comparison to the direction of the current

From the value of force we got the answer to this question is No

Explanation:

Generally magnetic force is mathematically represented as

$F = BIL$

Where the B is the magnitude of the magnetic field which is given as

$B= 0.55 guass = \frac{0.55}{10000} = 0.55 *10^{-4}T$

$I$ is the current with a value of $I = 1.5A$

L is the length of the wire given as $L =2.5m$

Substituting the value

$F =(0.55 *10^ {-4}) (1.5)(2.5)$

$F=2.1*10^{-4}N$

For the first case where the current is moving from west to east and we are told that the magnetic field is from south to north the according to Fleming's right hand rule the force(exerted by earths magnetic field ) would be moving from south to north (i.e upward)

For the second case where current is moving vertically upwards the direction of the force is to the west according to Fleming's right hand rule

7 0

3 years ago

Read 2 more answers