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4 years ago

12

What is the change in potential energy of an energetic 72 kg hiker who makes it from the floor of death valley to the top of mt.

whitney?

1 answer:

storchak [24]4 years ago

3 0

<span>The lowest point in Death Valley is 85 m below sea level. The summit of nearby Mt. Whitney has an elevation of 4420 m. </span>

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Which of the following pieces of home-made equipment is appropriate for use?

denis-greek [22]

Answer:

your neighbors biycyle inner tubes

Explanation:

hope this helps :)

4 0

2 years ago

an rlc series circuit has a 40.0 resistor,a 3.00 mH inductor, and a 5.00 capacitor, (a find the circuits impendance at 60.0 Hz

Gelneren [198K]

Answer:

Z = 530.89 ohms

Explanation:

Given that,

Resistor, R = 40 ohms

Inductor, L = 3 mH

Capacitor, C = 5 μF

We need to find the impedance of the circuit at frequency of 60 Hz. For a series LCR circuit, its impedance is given by the formula as follows :

$Z=\sqrt{R^2+(X_L-X_c)^2} \\\\Z=\sqrt{R^2+(2\pi fL-\dfrac{1}{2\pi fC})^2} \\\\Z=\sqrt{(40)^2+(2\pi \times 60\times 3\times 10^{-3}-\dfrac{1}{2\pi \times 60\times 5\times 10^{-6}})^2} \\Z=530.89\ \Omega$

So, the impedance of the circuit is 530.89 ohms.

7 0

4 years ago

Suppose you are taking a walk one day when you see a tree branch snap at its base and begin to rotate downward with the break ne

Naya [18.7K]

Answer:

α = 3.27 rad/s²

No

Explanation:

Given that

L= 3 m

Lets take mass of tree = m kg

The torque to mass m = m g .L

The mass moment of inertia of tree ,I

I = mL² kg.m²

We know that

τ = I α

m g .L = mL² .α

α= g/L

Now by putting the value

$\alpha =\dfrac{ 9.81}{ 3}\ rad/s^2$

α = 3.27 rad/s²

No we can find the mass of the from the above information because angular acceleration is not depend on the mass of tree.

6 0

3 years ago

Please help!! Also please explain if possible...

solmaris [256]

This is third equation of motion. As there is no values given, I assume you just have to keep variable 'a' (representing acceleration) on one side of the equation and all other variables on the other side.

$v_{f}^{2}= v_{o}^{2}+2a(x_{f}-x_{o})$

$v_{f}^{2}- v_{o}^{2}=2a(x_{f}-x_{o})$

$\frac{v_{f}^{2}- v_{o}^{2}}{2(x_{f}-x_{o})}=a$

OR

$a=\frac{v_{f}^{2}- v_{o}^{2}}{2(x_{f}-x_{o})}$

Here, $v_{o}$ is initial velocity,

$v_{f}$ is final velocity ,

$x_{o}$ is initial position,

$x_{f}$ is final position, and

a is acceleration.

3 0

3 years ago

Please answer both questions thanks :)

DanielleElmas [232]

14:D) Sound travels fastest in solids.
15:C) Light waves are theoretically the fastest thing in the universe.

3 0

4 years ago