Answer:
The alligator will take t = 10 s to reach the final speed of 35 m/s
Explanation:
As we know that the initial speed of the alligator is 5 m/s
then it accelerate by given acceleration to reach the final speed of 35 m/s
so we will have
now we have
Answer:
Explanation:
Because the total energy available to the ball doesn't change whatsoever during its entire trip from the window to the ground,
TE = KE + PE which says that the total energy available to a system is equal to the kinetic energy of the system plus the potential energy, and that this value will not ever change (because energy cannot be created or destroyed. Sound familiar?) If the ball is being held still before it is dropped from some height off the ground, it is here that the total energy can be determined, and that total energy at this point is all potential, since the ball is not moving while someone is holding it and getting ready to drop it. The SECOND it starts to fall, the potential energy begins to be converted to kinetic. As the potential energy is losing value, the kinetic is gaining it at the same rate (again, energy doesn't just disappear; it has to go somewhere. Here, it goes from potential to kinetic a little at a time). When the ball finally hits the ground, or an INSTANT BEFORE it hits the ground, the potential energy is 0 because the height of something on the ground has a height of 0. At this instant, right before the ball hits the ground, is where the KE is the greatest. All the energy at that point has been converted from potential to kinetic.
Long story short, choice B is the one you want.
Answer:
True.
Explanation:
The formula for the centripetal acceleration of an object can be calculated by the formula as follows :
Where
v is the speed of an object
r is the radius of the circle
It means, the centripetal acceleration depends directly on the square of the object's speed and inversely on the radius of the circle. Hence, the given statement is true.
With respect to the car's motion, the direction of the force acting on it as it approaches the red light must be <em>opposite</em> to the direction it's moving.
Since you're doing this question for Physics class, the best way to explain it is using one of Newton's laws of motion, especially the 2nd law:
Newton's #2: <u>Net force</u> = (mass) x (<u>acceleration</u>)
This is a vector equation ... that's why I underlined the vectors. The net force and the acceleration it produces are both vectors, in the same direction. (Makes sense. That's why we push things in the direction we want them to go !)
==> If you want to stop a moving car, you have to decrease its speed forward.
==> That's the same thing as increasing its speed backward.
==> An easier way to say that is: Accelerate it in the direction opposite to the way it's moving.
==> So you need to apply a net force (push the car) in the direction opposite to the way it's moving.
Answer:
The energy stored in the magnetic field of the solenoid is 0.633 mJ.
Explanation:
Given that,
Length = 8.61 cm
Number of turns = 677
Diameter = 1.46 cm
Resistance = 0.684 Ω
emf = 0.728 V
We need to calculate the energy stored in the magnetic field
Using formula of inductance
Where, N = number of turns
A= area
I = Current
Put the value into the formula
We need to calculate the current
Using ohm's law
We need to calculate the stored energy
Using formula of store energy
Put the value into the formula
Hence, The energy stored in the magnetic field of the solenoid is 0.633 mJ.
