The answer is D
The reason being because the singular replacement has the first letter of each side swap
For Example: A+BC —> B+AC
The answer is D i took the test but got it wrong but i got to see the answers
Answer:
D) The objects velocity is zero when its acceleration is a maximum
Explanation:
In a simple harmonic motion, the total energy is the sum of elastic potential energy (U) and kinetic energy (K):
(1)
where
k is the spring constant
x is the displacement
m is the mass
v is the velocity
The total energy E remains constant during the motion, so from the equation (1), we see that:
- At the equilibrium position, the displacement (x) is zero, so the velocity (v) is maximum
- At the point of maximum displacement, the displacement (x) is maximum, while the velocity (v) is zero
Let's also keep in mind that in a simple harmonic motion, the acceleration is directly proportional to the displacement (just the direction is opposite):
So, this means that at the point of maximum displacement, the acceleration is maximum and the velocity is zero.
Answer:
Explanation:
A car of mass 1000kg pushes 2000kg
The forward force is 4500N
Then, summation of the forward forces is ma
ΣF = Σ(ma) = m1a1 + m2a2
Since the body are moving together then, they will have the same acceleration(a)
ΣF = Σ(ma) = (m1+m2)a
Let m1=1000kg.
m2=2000kg
F=4500N
Then,
4500=(1000+2000)a
4500=3000a
Then,
a=4500/3000
a=1.5m/s²
The equivalent resistance of several resistors connected in series is
the sum of their individual values.
Four 75-ohm resistors connected in series are electrically equivalent
to a single resistor of 300 ohms.
The battery voltage doesn't matter. In fact, it doesn't matter whether the
resistors are anywhere near a battery or not. They could just as well still
be in the little Radio Shack envelope on the top shelf of the storage room.
If they're connected in series, then they're still electrically equivalent to a
single 300-ohm resistor.