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2 years ago

A steel rod has a radius of 10mm and a

1 answer:

4 0

Given a steel rod:
Radius = r = 10 mm = 0.010 m.
Length L = 1 m.
Tensile Force = F = 100 kN.
Young's Modulus = Y = 2.0 &* 10¹¹ Nm⁻²

a) Stress = Force/cross sectional area
σ = F / A
= 100,000 /(π 0.010²) Pa
= 318.309 MPa

b) Y = (F/A) / (ΔL/L)
Elongation ΔL = L F / (A Y)
= L σ / Y
= 1 * 318.309 * 10⁶ / 2.0 * 10¹¹ m
= 1.591 mm

c) Percentage elongation : ΔL/L * 100 = 0.1591 %

You might be interested in

How much will the top five winners of nasa’s design contest win?

sashaice [31]

Answer:

$\$100,000$

Explanation:

The top 5 winners of NASA's design contest winner received amount of $\$100,000$ (Dollar One hundred thousand). The respected amount was divided into 5 parts as there were 5 winners as well.

So, the amount was divided among the winners are as follows:

Winner 1 ⇒ $\$20,957.95$

Winner 2 ⇒ $\$20,957.24$

Winner 3 ⇒ $\$20,622.74$

Winner 4 ⇒ $\$19,580.97$

Winner 5 ⇒ $\$17,881.10$

Hence by adding all of the 5, we will get the answer, which is $\$100,000$ .

4 0

3 years ago

Two rocks weighing 5 Newtons and 10 Newtons are dropped simultaneously from the same height onto a Coyote. After three seconds o

Ilia_Sergeevich [38]

<h2>Potential energy lost by 10 N rock will be greater</h2>

Explanation:

Two rocks of 5N and 10N falls from the same height . Thus they will loose the potential energy.

The potential energy lost = mass x acceleration due to gravity x height

The potential energy lost by first 5 N rock = 5 h

Because weight of rock m g = 5 N

Similarly , the potential energy lost by 10 N Rock = 10 h

here weight of rock m g = 10 N

Thus comparing these two , the potential energy lost by 10 N rock is greater than that of 5 N rock .

5 0

4 years ago

Spud Webb, height 5'7", was one of the shortest basketball players to play in the NBA. But he had an impressive vertical leap; h

nlexa [21]

Answer:

a) v = 4.64 m / s , b) t = 0.947 s , c) t = 0.947 s

Explanation:

We will work on this exercise with vertical launch kinematics, let's start by calculating the height of the jumper in the SI system

y₀ = 5 ’(0.3048 m / 1’) + 7 ”(2.54 10-2 m / 1”) = 1.70 m

The distance they give is the height of the jump

y = 1.10 m

Let's use energy conservation

Starting point. On the floor

Em₀ = K = ½ m v²

Final point. Maximum height

Em_{f} = U = m g y

Em₀ = $Em_{f}$

½ m v² = m g y

v = √2gy

Let's calculate

v = √(2 9.8 1.10)

v = 4.64 m / s

b) Air time is the time to go up plus the time to go down, which is the same

For maximum height the speed is zero

v = v₀ - g t₁

t₁ = v₀ / g

t₁ = 4.64 /9.8

t₁ = 0.4735 s

The total time is

t = 2 t₁

t = 2 0.4735

t = 0.947 s

c) if it takes a distance of 0.40 to reach speed, what is the acceleration, as it stands on the floor its initial speed is zero

v² = v₀² + 2 a x

a = v² / 2x

a = 4.64²/2 0.40

a = 26.9 m / s²

7 0

4 years ago

When a resistor is connected to a 12 volt source, it draws a 185 mA current. what's the resistance? (I said 65 ohms). the same r

lyudmila [28]

Resistance-1 = (voltage-1) / (current-1) =

(12 V) / (0.185 A) = 64.9 ohms .

Resistance-2 = (voltage-2) / (current-2) =

(90 V ) / (1.25 A) = 72 ohms .

The resistance changed between situation-1 and situation-2 .
How did that happen ?

Power = (voltage) x (current)

Power-1 = (12) x (0.185) = 2.22 watts

Power-2 = (90) x (1.25) = 112.5 watts

The poor resistor dissipated 51 times as much power during
the second trial. It got all heated up, and its resistance went
through the roof.

Carbon resistors behave nicely and reliably, until you try to
toast bread or light up your bedroom with them.

8 0

3 years ago

Energy Calculation 4. What is the gravitational potential energy of an object that has a mass of 100kg it is 10m off of the grou

konstantin123 [22]

100kg * 9.8N/kg * 10m = 9800

3 0

3 years ago