Answer:
The current through the resistor is 0.5 A
Explanation:
Given;
power of the light bulb = 60 W
voltage in the wall outlet across the plug terminals = 120 V
power of the light bulb is the product of voltage in the wall outlet across the plug terminals and the current passing through the resistor.
power = voltage x current
Therefore, for a 60 W light bulb powered by a connection to a wall outlet with 120 V across the plug terminals, the current passing through the resistor is 0.5 A
Hello!
The answer to your questions is C.
Chemicals in the air- olfactory epithelium- olfactory receptors- cilia-olfactory bulb- brain
~Hope this Helps!~
Answer:
a. 1222.13 J b. 2.36 m. His new position is above his original position
Explanation:
From work-kinetic energy principle, workdone = change in kinetic energy
So work the skateboarder does on himself W₁ = -116 J
work done by friction W₂ = -264 J
gravitational potential energy change W₃ = mgΔy
The kinetic energy change ΔK = 1/2m(v² - u²) where m = mass of skater = 52.9 kg, u = initial speed of skaterboarder = 2.04 m/s and v = final speed of skaterboarder = 6 m/s. ΔK = 1/2m(v² - u²) = ΔK = 1/2 × 52.9(6² - 2.4²) = 842.13 J
So, W₁ + W₂ + W₃ = ΔK
W₃ = ΔK - W₁ - W₂ = 842.13 J - (-116 J) - (-264J) = 842.13 J + 116 J + 264J = 1222.13 J
b. Since W₃ = mgΔy = 1222.13 J
Δy = W₃/mg = 1222.13/(52.9 × 9.8) = 1222.13/518.42 = 2.36 m
Since Δy > 0, his new position is above his original position.
W=fd
W= (125N) (3.5m)
W= 437.5 J
Answer:
The speed of the car at the bottom of the circle is twice as its speed at the top of the circle.
Explanation:
It is given that, at the bottom of the circle, the car experiences four times as much radial (centripetal) acceleration as at the top of the circle such that :
The centripetal acceleration is given by :
Let 
are the speed of the roller coaster car at bottom and at top respectively.
.
So, the speed of the car at the bottom of the circle is twice as its speed at the top of the circle. Hence, the correct option is (D).
