The amplitude of a mechanical wave shows<br> What?

Suppose an isolated box of volume 2V is divided into two equal compartments. An ideal gas occupies half of the container and the

SpyIntel [72]

Answer:

A. the internal energy stays the same

Explanation:

From the first law of thermodynamics, "energy can neither be created nor destroyed but can be transformed from one form to another.

Based on this first law of thermodynamic, the new internal energy of the gas is the same as the internal energy of the original system.

Therefore, when the partition separating the two halves of the box is removed and the system reaches equilibrium again, the internal energy stays the same.

7 0

3 years ago

An astronaut is traveling in a space vehicle moving at 0.490c relative to the Earth. The astronaut measures her pulse rate at 66

marta [7]

To solve the exercise it is necessary to use the reciprocal Lorenz factor of the special theory of relativity with the pulse rate.

$\Xi = Pulse_{astronaut} * \alpha$

Where,

$\Xi =$ Pulse rate measured by earth observed

$\alpha =$ Reciprocal Lorenz Factor

$\alpha = \sqrt{1-\frac{v^2}{c^2}}$

Here v is the velocity and c the light speed.

PART A) For the given values we can replace it at the previous equation,

$\Xi = Pulse_{astronaut} *\sqrt{1-\frac{v^2}{c^2}}$

$\Xi = 66beats/min * \sqrt{1-\frac{(0.49c)^2}{c^2}}$

$\Xi = 57.5beats/min$

PART B ) If the speed of vehicle is 0.94c:

$\Xi = Pulse_{astronaut} *\sqrt{1-\frac{v^2}{c^2}}$

$\Xi = 66beats/min * \sqrt{1-\frac{(0.94c)^2}{c^2}}$

$\Xi = 22.5beats/min$

8 0

3 years ago

The titanium shell of an SR-71 airplane would expand when flying at a speed exceeding 3 times the speed of sound. If the skin of

Fed [463]

Answer:

The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.

Explanation:

From Physics we get that expansion of the rod portion is found by this formula:

$\Delta l = \alpha\cdot l_{o}\cdot (T_{f}-T_{o})$ (Eq. 1)

Where:

$\Delta l$ - Expansion of the rod portion, measured in meters.

$\alpha$ - Linear coefficient of expansion for titanium, measured in $\frac{1}{^{\circ}C}$ .

$l_{o}$ - Initial length of the rod portion, measured in meters.

$T_{o}$ - Initial temperature of the rod portion, measured in Celsius.

$T_{f}$ - Final temperature of the rod portion, measured in Celsius.

If we know that $\alpha = 5\times 10^{-6}\,\frac{1}{^{\circ}C}$ , $l_{o} = 10\,m$ , $T_{o} = 0\,^{\circ}C$ and $T_{f} = 400\,^{\circ}C$ , the expansion experimented by the rod portion is:

$\Delta l = \left(5\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (10\,m)\cdot (400\,^{\circ}C-0\,^{\circ}C)$

$\Delta l = 0.02\,m$

The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.

4 0

3 years ago

Question 2 (1 point)

MaRussiya [10]

Answer:

4.4694 meters per second, 74.4907 kilometers per hour.

3 0

3 years ago

Which of the following experiments could be used to determine the inertial mass of a block? A. Place the block on a rough horizo

valentinak56 [21]

Answer:

D, using a spring scale to exert a force on the block. Measure the acceleration of the block and the applied force

Explanation:

For this you would use the net force equation acceleration=net force * mass however you will want to isolate mass so it would be acceleration/ net force to get mass. Then process of elimination comes to play.

3 0

3 years ago

The amplitude of a mechanical wave shows What?