1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leokris [45]
3 years ago
8

A) A spaceship passes you at a speed of 0.800c. You measure its length to be 31.2 m .How long would it be when at rest?

Physics
1 answer:
rosijanka [135]3 years ago
4 0

Answer:

a

     l_o  =52 \  m

b

      l = 37.13 \ LY

Explanation:

From the question we are told that

    The  speed of the spaceship is  v  =  0.800c

    Here  c is the speed of light with value  c =  3.0*10^{8} \ m/s

    The  length is  l = 31.2 \  m

     The  distance of the star for earth is d = 145 \  light \  years

     The  speed is v_s = 2.90 *10^{8}

     

Generally the from the length contraction equation we have that

       l  =  l_o  \sqrt{1 -[\frac{v}{c } ]}

Now the when at rest the length is  l_o

So  

      l_o =\frac{l}{\sqrt{ 1 - \frac{v^2}{c^2 } } }

      l_o =\frac{ 31.2 }{ \sqrt{1 - \frac{(0.800c ) ^2}{c^2} } }

      l_o=52 \  m

Considering b  

  Applying above equation

            l  =l_o \sqrt{1 -  [\frac{v}{c } ]}

Here l_o  =145 \  LY(light \ years )

So

           l=145 *  \sqrt{1 -  \frac{v_s^2}{c^2 } }

            l =145 *  \sqrt{ 1 - \frac{2.9 *10^{8}}{3.0*10^{8}} }

            l = 37.13 \ LY

You might be interested in
A girl is standing still in the middle of a baseball field. The girl catches the baseball and begins to move in the same directi
marusya05 [52]
A. inelastic, since the girl moves in the same direction as the thrown ball
5 0
3 years ago
Read 2 more answers
If I am throwing a bowling ball off a roof and a watermelon off a roof at 30
rosijanka [135]

Answer:

Th ball

Explanation:

8 0
3 years ago
Do these four animals have invertebrates?
ira [324]
The worm is the invertebrate. All the other animals are vertebrates.
5 0
3 years ago
A 3-kW resistance heater in a water heater runs for 3 hours to raise the water temperature to the desired level. Determine the a
Kipish [7]

Answer:

Energy, 9 kWh or 32400 kJ

Explanation:

Given that,

The power of heater, P = 3 kW

It runs for 3 hours to raise the water temperature to the desired level. We need to find the amount of electric energy used. We know that the electrical power of an object is given by total energy delivered per unit time. It is given by :

P=\dfrac{E}{t}

E=P\times t

E=3\ kW\times 3\ h

E = 9 kWh

Since, 1 kWh = 3600 kJ

E = 32400 kJ

So, the amount of electric energy used is 9 kWh or 32400 kJ. Hence, this is the required solution.

4 0
3 years ago
The force required to move a chair 4 meters is 3 newton’s. what amount of work is done
zlopas [31]

Answer: 12 J

Explanation:

Work = force*displacement

Work= 3N*4m= 12 Joule

7 0
3 years ago
Other questions:
  • A bag is gently pushed off the top of a wall at A and swings in a vertical plane at the end of a rope of length l. Determine the
    12·1 answer
  • The net Forward force on the propeller of a 3.2 KG model airplane is 7.0 N. What is the acceleration of the airplanes
    14·1 answer
  • Calculate the force of gravity acting on an object that has a mass of 1.3 kilograms. The object is on Earth soyuz 9.8 m / S 2 fo
    7·1 answer
  • An electric circuit can have no current when a switch is closed.<br> True<br> False
    13·1 answer
  • The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=4250
    15·1 answer
  • What is the new kinetic energy of the 1900 kg ship on the right moving at 4 m/s?
    13·2 answers
  • A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 30.0 min
    5·1 answer
  • A solenoid used to produce magnetic fields for research purposes is 2.1 m long, with an inner radius of 28 cm and 1300 turns of
    10·1 answer
  • The graph shows a wave that oscillates with a frequency of 60 Hz. Based on the information given in the diagram, what is the spe
    6·1 answer
  • (Cr(NH3).](Co(CN)6) is a coordination complex
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!