<span>We can draw a free body diagram for the safe to show all the horizontal forces acting on the safe. The three horizontal forces are Clyde's force, Bonnie's force, and friction. Since the safe slides at a constant speed (no acceleration), the net force must be zero.
0 = Clyde's force + Bonnie's force - friction
friction = Clyde's force + Bonnie's force
mg mu = Clyde's force + Bonnie's force
mu = (Clyde's force + Bonnie's force) / (mg)
mu = (445 N + 350 N) / (300 kg x 9.80~m/s^2)
mu = 0.27
The coefficient of friction is 0.27</span>
Answer:
4.87×10⁶ kJ
1.63×10⁸ Joules
1015 $
Explanation:
a. To convert the units, you can use this conversion factor:
1 kWh = 3.6×10⁶J
1355 kWh . 3.6×10⁶J / 1 kWh = 4.871×10⁹ J
Now we convert to kJ → 4.87×10⁹ J . 1 kJ/1000J = 4.87×10⁶ kJ
b. In 30 days, we used 1355 kWh so, let's determine the use by day
1355 kWh / 30 day = 45.2 kWh
Now we convert the 45.2 kWh to Joules → 45.2 kWh . 3.6×10⁶J / 1 kWh =
1.63×10⁸ Joules
c. We can make a rule of three, for this:
1 kWh costs $0.749
1355 kWh will pay (1355 . 0.749) / 1 = 1015 $
Answer:
Seven
Explanation:
Because all halogens have seven valence electrons, they are “eager” to gain one more electron. Doing so gives them a full outer energy level, which is the most stable arrangement of electrons. Halogens often combine with alkali metals in group 1 of the periodic table.
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The planet that takes shortest time to orbit the sun is Mercury because it is closest to the sun.
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