Two identical spring scales are each attached to a cord that is wrapped around a pulley. the two pulleys have identical mass

A space shuttle orbits Earth at a speed of 21,000 km/hr. How far will it travel in 5 hours?

lianna [129]

Answer:

105000km

Explanation:

Given parameters:

Speed of shuttle = 21000km/hr

Time of travel = 5hrs

Unknown:

The distance covered by the space shuttle;

Solution:

Distance is the length of the path traveled.

Distance = speed x time

Input the parameters and solve;

Distance = 21000km/hr x 5hrs

Distance = 105000km

6 0

3 years ago

For an air bag to work, it has to inflate full of nitrogen incredibly fast-within to

Lunna [17]

5.8 moles of nitrogen gas are needed to pressurize the air bag.

<h3>What's the expression of Ideal gas equation?</h3>

Ideal gas equation is PV=nRT
P= pressure, V = volume, n= no. of moles of gas, R= universal gas constant, T = temperature of the gas

<h3>What's the no. of moles of nitrogen present in a 60L air bag at 2.37 atm pressure and 25°C temperature?</h3>

P= 2.37 atm, V = 60L, R= 0.0821 L-atm/mol-K, T = 25°C = 298K
n= PV/RT

= (2.37×60)/(0.0821×298)

= 5.8 moles

Thus, we can conclude that 5.8 moles of nitrogen gas are needed to pressurize the air bag.

Learn more about the ideal gas here:

brainly.com/question/20348074

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8 0

2 years ago

A person jumps out a fourth-story window 14 m above a firefighter safety net. The survivor stretches the net 1.8 m before coming

Monica [59]

Answer:

The deceleration is $a = - 76.27 m/s^2$

Explanation:

From the question we are told that

The height above firefighter safety net is $H = 14 \ m$

The length by which the net is stretched is $s = 1.8 \ m$

From the law of energy conservation

$KE_T + PE_T = KE_B + PE_B$

Where $KE_T$ is the kinetic energy of the person before jumping which equal to zero(because to kinetic energy at maximum height )

and $PE_T$ is the potential energy of the before jumping which is mathematically represented at

$PE_T = mg H$

and $KE_B$ is the kinetic energy of the person just before landing on the safety net which is mathematically represented at

$KE_B = \frac{1}{2} m v^2$

and $PE_B$ is the potential energy of the person as he lands on the safety net which has a value of zero (because it is converted to kinetic energy )

So the above equation becomes

$mgH = \frac{1}{2} m v^2$

=> $v = \sqrt{2 gH }$

substituting values

$v = 16.57 m/s$

Applying the equation o motion

$v_f = v + 2 a s$

Now the final velocity is zero because the person comes to rest

So

$0 = 16.57 + 2 * a * 1.8$

$a = - \frac{16.57^2 }{2 * 1.8}$

$a = - 76.27 m/s^2$

4 0

3 years ago

A sound wave is an example of an electromagnetic wave in nature?

AVprozaik [17]

No. Sorry. A sound wave is a mechanical wave. There's nothing electromagnetic about it.

8 0

4 years ago

this stationary wave is what we call the first harmonic of the first normal mode of the system. in units of l, the length of the

Dafna1 [17]

The wavelength of the first harmonic of the standing wave is 2L.

<h3>What is a standing wave?</h3>

A standing wave is one in which the obvious points remain fixed as the vibration continues. A standing wave occurs in a wind instrument such as a trumpet, saxophone etc.

We know from the formula of the first harmonic that the wavelength of the first harmonic of the standing wave is 2L.

Learn more about standing wave:brainly.com/question/1121886?

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3 0

2 years ago