Definitely D. The brakes on a bike rub against the wheel. Not sure about the others.
Answer:
3.61 m
Explanation:
First, find how long it takes to land.
Given (in the y direction):
Δy = 16 m
v₀ = 0 m/s
a = 9.8 m/s²
Find: t
Δy = v₀ t + ½ at²
(16 m) = (0 m/s) t + ½ (9.8 m/s²) t²
t = 1.81 s
Given (in the x direction):
v₀ = 2.0 m/s
a = 0 m/s²
t = 1.81 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (2.0 m/s) (1.81 s) + ½ (0 m/s²) (1.81 s)²
Δx = 3.61 m
Answer:
4 Ohms
Explanation:
The challenging part in this circuit is the bridged setup (diamond-shaped arrangement made of the 4 Ohm resistors). In general, this would first need to be transformed using the Wye-Delta transform to be solved, but in this case we can make a valid simplification: since the diamond arrangement is completely symmetrical, the voltage at the top and the bottom tip of the "diamond" will be identical and no current flows through the 4 Ohm bridge, hence, this resistor can be removed without changing the resulting resistance. After this, it is easy to see that the equivalent resistance of the modified "diamond" is just 4 Ohms.
The remaining top parallel branch of the circuit will be 8 Ohms, and the bottom parallel branch is nominally 8 Ohms. The resulting resistance therefore is 4 Ohms.
(The answer is not 2 Ohms!)