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3 years ago

6

PLEASE ANSWER, HURRY! THANKS :) A green object will absorb light and reflect light. Ex

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1 answer:

olga55 [171]3 years ago

8 0

Answer:

It will absorb yellow and reflect green

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where σ(t) and σ(0) represents the time-dependent and initial (i.e., time =0) stresses, respectively, and t and τ denote elapsed

lesya [120]

Answer:

$E_r(6)=4.35614\ MPa$

Explanation:

$\epsilon$ = Strain = 0.49

$\sigma _0$ = 3.1 MPa

At t = Time = 32 s $\sigma$ = 0.41 MPa

$\tau$ = Time-independent constant

Stress relation with time

$\sigma=\sigma _0exp\left(-\frac{t}{\tau}\right)$

at t = 32 s

$0.41=3.1exp\left(-\frac{32}{\tau}\right)\\\Rightarrow exp\left(-\frac{32}{\tau}\right)=\frac{0.41}{3}\\\Rightarrow -\frac{32}{\tau}=ln\frac{0.41}{3}\\\Rightarrow \tau=-\frac{32}{ln\frac{0.41}{3}}\\\Rightarrow \tau=16.0787\ s$

The time independent constant is 16.0787 s

$E_{r}(t)=\frac{\sigma(t)}{\epsilon_0}$

At t = 6

$\\\Rightarrow E_{r}(6)=\frac{\sigma(6)}{\epsilon_0}$

From the first equation

$\sigma(t)=\sigma _0exp\left(-\frac{t}{\tau}\right)\\\Rightarrow \sigma(6)=3.1exp\left(-\frac{6}{16.0787}\right)\\\Rightarrow \sigma(6)=2.13451$

$E_r(6)=\frac{2.13451}{0.49}\\\Rightarrow E_r(6)=4.35614\ MPa$

$E_r(6)=4.35614\ MPa$

6 0

3 years ago

The haystack maker tractor lifted 120 kg of grass to a height of 5 meters in 6 seconds. Calculate the power of the haystack make

Gelneren [198K]

Answer:

1000 Joules per second.

Explanation:

To lift that much grass 5 meters higher than it was before the tractor did work that is the product of the (force needed to overdo gravity) and (displacement):

$W = mg\Delta h=120kg\cdot 10\frac{m}{s^2}\cdot 5m = 6000J$

Power is work over the amount of time:

$P = \frac{W}{\Delta t}=\frac{6000J}{6 s} = 1000 \frac{J}{s}$

4 0

3 years ago

A weightlifter presses a 400 n weight 0.5 m over his head in 2 seconds, what is the power of the weight lifter

Scrat [10]

There are two ways to solve this problem. First we write the given.

Given: Force F = 400 N; Height h = 0.5 m; Time t = 2 s

Formula: P = W/t; but Work W = Force x distance or W = f x d

Weight is also a Force, therefore: W = mg, solve for Mass m = ?

m = w/g m = 400 N/9.8 m/s² m = 40.82 Kg

P = W/t = F x d/t = mgh/t P = (40.82 Kg)(9.8 m/s²)/2 s

P = 100 J/s or 100 Watts

3 0

3 years ago

Describe your motion in terms of velocity and acceleration as you ride in a car down the street, come to a red light, wait for t

aleksandr82 [10.1K]

Ride in a car down the street: constant velocity,
come to a red light: negative acceleration,
wait for the green light: zero velocity,
<span>start off again: </span>positive acceleration

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3 years ago

Read 2 more answers

What is (4.2 x 10 to the fifth power) time (4.0 times 10 to the negative ninth power)

luda_lava [24]

(4.2*10^5)*(4*10^-9) = 1.68* 10^-3

8 0

3 years ago