Answer:
2.1 m/ss
Explanation:F=ma a=F/M a=4,200/2,000= a=2.1 m/ss
because of gravitional pull
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A 60-w power lightbulb uses 0.5 amps of electricity when connected to a 120-v home line.
Calculation:
Provided that,
Power, P = 60 w
Voltage, V = 120 v
We have to find out the current or electricity consumption, I.
We know that Power (P)is equal to the voltage(V) divided by current(I), or
P = VI
⇒I = P/ V [when power is divided by voltage we get current]
⇒I = 60 / 120
⇒I = 0.5 amp
Therefore from the above calculation, it is concluded that when a 60 w bulb is operating on a 120 v line, it consumes 0.5 amp current.
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Answer:
The buoyant force on the wood = 7.652 N
Explanation:
According to the principle of flotation, a body floats when the upthrust exerted upon it by the fluid n which it floats equals the weight of the body.
W = U ............... Equation.
Where W = weight of the wood, U = Upthrust or buoyant force.
Recall That,
Density = mass/volume
Mass = Density×volume
m = D×V........................ Equation 2
Where m = mass of the wood, V = Volume of the wood, D = Density of the wood.
But
Volume of a cube = a³
V = a³ where a = length of the cube.
V = 10³ = 1000 cm³.
Given: V = 1000 cm³ D = 0.780 g/cm³
Substituting these values into equation 2,
m = 1000(0.780)
m = 780 g
m = 0.78 kg.
But W = mg
Where m = 0.78 kg, g = 9.81 m/s²
W = 0.78(9.81)
W = 7.652 N.
Since W = U = 7.652 N.
U = 7.652 N
Therefore the buoyant force on the wood =7.652 N