An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could An obje
1 answer:
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Use the formula,
where is the cart's displacement (from the origin),
is its initial speed,
is its acceleration, and
is time.
Alternatively, since acceleration is constant, we have
That is, we have these two equivalent expressions for average velocity, where is the cart's final velocity. Solve for
:
Answer:
Explanation:
Discount the time here; it's not important. It doesn't tell you how long it takes the car to stop, it only refers to reaction time, which means nothing in the scheme of things.
The useful info is as follows:
initial velocity = 20 m/s
final velocity = 0 m/s
a = -10 m/s/s
and we are looking for the displacement. Use the following equation:
Δx
where v is the final velocity, v₀ is the initial velocity, a is the deceleration (since it's negative), and Δx is displacement. Filling in:
Δx and
0 = 400 - 20Δx and
-400 = -20Δx so
Δ = 20 meters
Answer:
A)
B)
C)
Explanation:
Coulomb's Law is
where r is the distance between the two point charges.
The question clearly asks the unit vector expressions of the force that q exerts on the other charge. So, we do not need to find the force, but only the distance vector, r, between charges, and then we can derive the unit vector pointing only the direction of the force.
A)
B)
C)