Maintenance spanner are needed in great numbers to service all sorts of technical equipment
        
             
        
        
        
Answer:
The acceleration due to gravity at Pluto is 0.0597 m/s^2. 
Explanation:
Length, L = 1 m 
10 oscillations in 257 seconds 
Time period, T = 257/10 = 25.7 s 
Let the acceleration due to gravity is g. 
Use the formula of time period of simple pendulum

 
        
             
        
        
        
Electromagnet is in form of solenoid
and the magnetic field due to solenoid is given as

here 
i = current in the loop
so when we increase the current in electromagnet the magnetic field of the solenoid will increase
this will increase the strength of the electromagnet
so the answer would be
<em>INCREASE</em>
 
        
                    
             
        
        
        
4
Every current through a wire produced a magnetic field. And since the magnetic field of Earth is weak, it will get attracted towards the wire.
        
                    
             
        
        
        
2.71 m/s fast Hans is moving after the collision.
<u>Explanation</u>:
Given that,
Mass of Jeremy is 120 kg ( )
)
Speed of Jeremy is 3 m/s ( )
)
Speed of Jeremy after collision is ( ) -2.5 m/s
) -2.5 m/s
Mass of Hans is 140 kg ( )
)
Speed of Hans is -2 m/s ( )
)
Speed of Hans after collision is ( )
)
Linear momentum is defined as “mass time’s speed of the vehicle”. Linear momentum before the collision of Jeremy and Hans is  
= 
Substitute the given values,
= 120 × 3 + 140 × (-2)
= 360 + (-280)
= 80 kg m/s
Linear momentum after the collision of Jeremy and Hans is  
= 
= 120 × (-2.5) + 140 × 
= -300 + 140 × 
We know that conservation of liner momentum,
Linear momentum before the collision = Linear momentum after the collision
80 = -300 + 140 × 
80 + 300 = 140 × 
380 = 140 × 
380/140= 
 = 2.71 m/s
 = 2.71 m/s
2.71 m/s fast Hans is moving after the collision.