Answer:
D. Upward force on the shuttle
Explanation:
The hot gas from space shuttles released downward causes an upward force on the shuttle and propels it up the more. 
- This hot gas is produced from super cooled oxygen and hydrogen tanks within the shuttle. 
- The upward force on the shuttle allows the craft to escape the gravitational pull of the earth on the shuttle 
- Special level of rapid acceleration must be attained for the shuttle to escape the earth pull. 
 
        
             
        
        
        
<span>1. No energy is gained or lost when molecules collide.
2. The molecules in a gas take up a negligible (able to be ignored) amount of space in relation to the container they occupy. 
3. The molecules are in constant, linear motion.</span>
        
                    
             
        
        
        
Answer with Explanation:
We are given that 
Distance,r=0.27 m
Tangential speed=v=0.49 m/s
a.Angular speed ,
Using the formula 



Time period,
b.Amplitude,A=Distance of small eraser from the center of a turnable =0.27 m
c.Maximum speed,
d.Maximum acceleration=
 
        
                    
             
        
        
        
Explanation:
The initial kinetic energy  for both blocks is zero. Let
 for both blocks is zero. Let  and
 and  . So using the conservation law of linear momentum, we can write
. So using the conservation law of linear momentum, we can write 

or

The final kinetic energies for the two masses are


Therefore, the ratio of their kinetic energies is

 
        
             
        
        
        
Answer:
26.6 cm
Explanation:
We are given that 
Spring constant=23.6 N/m
Force exert=6.28 N
We have to find the displacement.
We know that Hooke's law

Where k= Spring constant
x=Displacement 
Using the formula 
Then, we get 


We know that 1 m=100 cm

Hence, the displacement =26.6 cm