Answer:
It takes <u>951 seconds</u> to boil a cup of water.
Explanation:
Given:
EMF of the battery (E) = 10.0 V
Internal resistance of the battery (r) = 0.04 Ω
Resistance of the circuit = 'R'
Current measured in the circuit (I) = 11.0 A
Energy required to boil water (U) = 100 kJ = 100 × 10³ J [1 kJ = 10³ J]
Time taken for boiling (t) = ?
We know that, the emf of the battery is given as:
Plug in the given values and solve for 'R'. This gives,
Now, energy required to boil the water is given as:
Plug in the given values and solve for 't'. This gives,
So, it takes 951 seconds to boil a cup of water.
Answer:
The submerged effective density is 86.93 kN/m³ or 8.693 Mg/m³
Explanation:
Given;
wet density of soil sample = 2.5 Mg/m³ = 25 kN/m³
Specific gravity of solid particle = 2.7
The dry unit weight of soil;
for undisturbed state, the volume of the soil is;
Submerged effective density is given as;
density of water (ρw) = 2.7 x 25 kN/m³ = 67.5 kN/m³, substitute this in the above equation;
Therefore, the submerged effective density is 86.93 kN/m³ or 8.693 Mg/m³
Answer:
4N
Explanation:
a = (7-3)/5 = 0.8m/s^2
F = ma = (5)(0.8) = 4 Newtons
Answer:
B. ) 0.34 m
I definitely guessed and got the right answer so :))
a. 46 m/s east
The jet here is moving with a uniform accelerated motion, so we can use the following suvat equation to find its velocity:
where
v is the velocity calculated at time t
u is the initial velocity
a is the acceleration
The jet in the problem has, taking east as positive direction:
u = +16 m/s is the initial velocity
is the acceleration
Substituting t = 10 s, we find the final velocity of the jet:
And since the result is positive, the direction is east.
b. 310 m
The displacement of the jet can be found using another suvat equation
where
s is the displacement
u is the initial velocity
a is the acceleration
t is the time
For the jet in this problem,
u = +16 m/s is the initial velocity
is the acceleration
t = 10 s is the time
Substituting into the equation,
