Answer:
 W_apparent = 93.1 kg
Explanation:
The apparent weight of a body is the weight due to the gravitational attraction minus the thrust due to the fluid where it will be found.
             W_apparent = W - B
 The push is given by the expression of Archimeas
             B = ρ_fluide g V
             ρ_al = m / V
             m = ρ_al V
we substitute
             W_apparent = ρ_al V g - ρ_fluide g V
             W_apparent = g V (ρ_al - ρ_fluide)
        
we calculate
            W_apparent = 980 50 (2.7 - 0.8)
            W_apparent = 93100 g
             W_apparent = 93.1 kg
 
        
             
        
        
        
The potential difference across the parallel plate capacitor is 2.26 millivolts
<h3>Capacitance of a parallel plate capacitor</h3>
The capacitance of the parallel plate capacitor is given by C = ε₀A/d where 
- ε₀ = permittivity of free space = 8.854 × 10⁻¹² F/m, 
- A = area of plates and 
- d = distance between plates = 4.0 mm = 4.0 × 10⁻³ m.
<h3>Charge on plates</h3>
Also, the surface charge on the capacitor Q = σA where 
- σ = charge density = 5.0 pC/m² = 5.0 × 10⁻¹² C/m² and 
- a = area of plates.
<h3>
The potential difference across the parallel plate capacitor</h3>
The potential difference across the parallel plate capacitor is V = Q/C 
= σA ÷ ε₀A/d 
= σd/ε₀ 
Substituting the values of the variables into the equation, we have
V = σd/ε₀
V = 5.0 × 10⁻¹² C/m² × 4.0 × 10⁻³ m/8.854 × 10⁻¹² F/m 
V = 20.0 C/m × 10⁻³/8.854 F/m
V = 2.26 × 10⁻³ Volts
V = 2.26 millivolts
So, the potential difference across the parallel plate capacitor is 2.26 millivolts
Learn more about potential difference across parallel plate capacitor here:
brainly.com/question/12993474
 
        
             
        
        
        
Answer:
The magnification is -6.05.
Explanation:
Given that,
Focal length = 34 cm
Distance of the image =2.4 m = 240 cm
We need to calculate the distance of the object

Where, u = distance of the object 
v = distance of the image 
f = focal length
Put the value into the formula



The magnification is



Hence, The magnification is -6.05.
 
        
             
        
        
        
Never is the correct answer