These days, scientists all over the world use a standard system of measurements.  It's the SI or metric system.
What about scientists in the United States, Liberia, and Burma ?  
These three countries are the only ones in the world that haven't 
adopted the metric system.  What do THEY do ?
Easy.  When scientists in those countries are off work, they use the 
inches, yards, feet, quarts, miles and gallons that everybody around 
them is using.  But when they go to work, they use the same metric 
system that everyone else in the world is using.
        
                    
             
        
        
        
A) The biggest astronomical object is the Universe, which contains billions of galaxies among which there is the Milky Way.
The Milky Way contains thousands of planetary systems, among which the Solar System.
The Solar System contains many <span>planets <span>(but only one star, the Sun)</span>,</span> among which there is Earth.
Therefore you can label:
A = Universe, B = Milky Way, C = Solar system, D = Earth
b) Given what we said before, you could label D also any other planet in the Solar System, therefore you can choose among Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune.
        
             
        
        
        
Answer:
W = 28226.88 N
Explanation:
Given,
Mass of the satellite, m = 5832 Kg
Height of the orbiting satellite from the surface, h = 4.13 x 10⁵ m
The time period of the orbit, T = 1.9 h
                                             = 6840 s
The radius of the planet, R = 4.38 x 10⁶ m
The time period of the satellite is given by the formula
                               second
  second
Squaring the terms and solving it for 'g'
                               g = 4 π²  m/s²
   m/s² 
Substituting the values in the above equation
                    g = 4 π²  
  
                                      g = 4.84 m/s²       
Therefore, the weight
                                      w = m x g   newton
                                          = 5832 Kg x 4.84 m/s²
                                          = 28226.88 N
Hence, the weight of the satellite at the surface, W = 28226.88 N                 
 
        
             
        
        
        
Answer:
"2Ω" is the net resistance in the circuit.
Explanation:
The given resistors are:
R1 = 3Ω
R2 = 6Ω
The net resistance will be:
⇒  
On substituting the values, we get
⇒  
On taking L.C.M, we get
⇒  
⇒  
⇒  
On applying cross-multiplication, we get
⇒ 
 
        
             
        
        
        
Answer:
P=9.58 W
Explanation:
According to Newton's second law, and assuming friction force as zero:

The acceleration is given by:

So the force exerted  by the motor is:

The work done by the motor is given by:


And finally, the power is given by:
