Answer:
3.014 x 10⁻⁸ N 
Explanation:
q = magnitude of charge on the supersonic jet = 0.55 μC = 0.55 x 10⁻⁶ C 
v = speed of the jet = 685 m/s 
B = magnitude of magnetic field in the region = 8 x 10⁻⁵ T 
θ = angle between the magnetic field and direction of motion = 90
magnitude of the magnetic force is given as 
F = q v B Sinθ
F = (0.55 x 10⁻⁶) (685) (8 x 10⁻⁵) Sin90
F = 3.014 x 10⁻⁸ N 
 
        
             
        
        
        
Answer:
a barometer is used to measure atmospheric pressure, and a manometer is used to measure gauge pressure.
Explanation:
A barometer measures air pressure at any locality with sea level as the reference.
 However, a manometer is used to measure all pressures especially gauge pressures. Thus, if the aim is to measure the pressure at any point below a fluid surface, a barometer is used to determine the air pressure. The manometer may now be used to determine the gauge pressure
The algebraic sum of these two values gives the absolute pressure.
 
        
             
        
        
        
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<h3>Explanation</h3>
The Stefan-Boltzmann Law gives the energy radiation <em>per unit area</em> of a black body:

where,
 the total power emitted, the total power emitted,
 the surface area of the body, the surface area of the body,
 the Stefan-Boltzmann Constant, and the Stefan-Boltzmann Constant, and
 the temperature of the body in degrees Kelvins. the temperature of the body in degrees Kelvins.
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Keep as many significant figures in  as possible. The error will be large when
 as possible. The error will be large when  is raised to the power of four. Also, the real value will be much smaller than
 is raised to the power of four. Also, the real value will be much smaller than  since the emittance of a human body is much smaller than assumed.
 since the emittance of a human body is much smaller than assumed.