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3 years ago

2. Describe the difference between a manned and unmanned spaceflight.

Physics

1 answer:

tamaranim1 [39]3 years ago

5 0

Answer:

Manned spacecraft are vehicles that can transport human beings outside the Earth's atmosphere. An unmanned space mission is launched without human passengers or crew. When a vehicle is unmanned, it's controlled from far away or by a robotic or autopilot system. Compared to manned missions, unmanned missions are less expensive, as their missions are able to gather data for an extended period of time. Messenger: sent on a mission to Mercury; about $446 million (including spacecraft and instrument development, launch vehicle, mission operations and data analysis).

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During your summer internship for an aerospace company, you are asked to design a small research rocket. The rocket is to be lau

Thepotemich [5.8K]

Answer:

$T=6.75s$

Explanation:

We must separate the motion into two parts, the first when the rocket's engines is on and the second when the rocket's engines is off. So, we need to know the height ( $h_1$ ) that the rocket reaches while its engine is on and we need to know the distance ( $h_2$ ) that it travels while its engine is off.

For solving this we use the kinematic equations:

In the first part we have:

$h_1=v_0T+\frac{1}{2}aT^2\\h_1=0*T+\frac{1}{2}(16\frac{m}{s^2})T^2\\h_1=8\frac{m}{s^2}T^2\\$

and the final speed is:

$v_f=v_0+aT\\v_f=0+16\frac{m}{s^2}T\\v_f=16\frac{m}{s^2}T$

In the second part, the final speed of the first part it will be the initial speed, and the final speed is zero, since gravity slows it down the rocket.

So, we have:

$v_f^2=v_0^2+2gh_2\\2gh_2=v_f^2-v_0^2\\h_2=\frac{v_f^2-v_0^2}{2g}\\h_2=\frac{0^2-(16\frac{m}{s^2}T)^2}{2(-9.8\frac{m}{s^2})}\\h_2=\frac{-256\frac{m^2}{s^4}T^2}{-19.6\frac{m}{s^2}}\\h_2=13.06\frac{m}{s^2}T^2$

The sum of these heights will give us the total height, which is known:

$h=h_1+h_2\\960m=8\frac{m}{s^2}T^2+13.06\frac{m}{s^2}T^2\\960m=21.06\frac{m}{s^2}T^2\\T^2=\frac{960m}{21.06\frac{m}{s^2}}\\T^2=45.58s^2\\T=\sqrt{45.58s^2}\\T=6.75s$

This is the time that its needed in order for the rocket to reach the required altitude.

5 0

3 years ago

Use hubble's law to determine the distance to a galaxy which is moving away at a velocity of 3,500 km/s. (assume that h = 70 km/

lorasvet [3.4K]

The solution for this problem:
The distance in mega parsec is equal to recession velocity / H, where h is equal to 50 mega parsec.The explanation for this is:1 parsec = 2.E+05 AU, nearly. 50 mega parsec = 1. E+13 AU, nearly. 1 mega means E+06 (million).

5 0

3 years ago

Science 8 - Electromagnetic Spectrum Worksheet

yuradex [85]

Answer:

1. Electromagnetic spectrum

2. Electromagnetic radiation

3. Radiant energy

4. Infared waves

5. Electricmagnetic radiation or Infared waves

6. Radio waves

7. Gamma rays

8. Radio waves

9. Ultraviolet rays

10. This is because it doesn’t contain water or a substance.

11. You should use sunscree and a hat to protect your skin from UV light that might cause skin cancer.

Hope this helps

7 0

3 years ago

To get an accurate data reading, scientists must be sure to

joja [24]

D.
Always use the right tool to get accurate measurements

8 0

4 years ago

An object–spring system undergoes simple harmonic motion. If the amplitude increases but the mass of the object is not changed,

cricket20 [7]

Answer:

The correct answer is:

doesn't change (d)

Explanation:

The total energy in a system is the sum of Kinetic and Potential energies in a system, assuming that energy is not lost to an external procedure. Now, let us define what potential and kinetic energies are:

Potential Energy: this is energy at rest or stored energy

Kinetic Energy: this is energy in motion

In a simple harmonic motion of a mass-spring system, there is no dissipative force, hence the total energy is equal to the potential and kinetic energies. The total energy is not changed rather, it varies between potential and kinetic energies depending on the point at which the mass is. The kinetic energy is greatest at the point of lowest amplitude (highest velocity) and lowest at the point of greatest amplitude (lowest velocity), while potential energy is greatest at the point of highest amplitude (lowest velocity) and lowest at the point of smallest amplitude ( highest velocity). However, at every point, the sum of kinetic and potential energies equals total energy.

6 0

3 years ago