<u>Answer:
</u>
Metal ball will take 0.364 seconds to reach floor.
<u>Explanation:
</u>
Initial height from ground = 65 cm = 0.65 meter
We have equation of motion , 
, s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
In this the velocity of body in vertical direction = 0 m/s, acceleration =acceleration due to gravity = 9.8 
, we need to calculate time when s = 0.65 meter.
Substituting
So it will take 0.364 seconds to reach floor.
Answer:
d) Hannah knows there will be a quiz on the lesson’s main idea and key points, so she wants to take detailed notes.
Explanation:
I just took the quiz on edgenuity, I got it right. Hope this helps. Good luck on future assignments.
Answer:
a)3.65 s
b)54.75 m
Explanation:
take g=10 m/s^2
x(t)=15 t
v(t)=10-10*t
-30=10*t-5*t^2.....(1)
solving the eq (1) we get
t=3.65 s hence,
R≅15*3.6 = 54.75 m
note:
graphs are attached
Answer:
In the scientific model, electric current is the overall movement of charged particles in one direction. The cause of this movement is an energy source like a battery, which pushes the charged particles. The charged particles can move only when there is a complete conducting pathway (called a ‘circuit’ or ‘loop’) from one terminal of the battery to the other.
A simple electric circuit can consist of a battery (or other energy source), a light bulb (or other device that uses energy), and conducting wires that connect the two terminals of the battery to the two ends of the light bulb. In the scientific model for this kind of simple circuit, the moving charged particles, which are already present in the wires and in the light bulb filament, are electrons.
Electrons are negatively charged. The battery pushes the electrons in the circuit away from its negative terminal and pulls them towards the positive terminal (see the focus idea Electrostatics – a non contact force). Any individual electron only moves a short distance. (These ideas are further elaborated in the focus idea Making sense of voltage). While the actual direction of the electron movement is from the negative to the positive terminals of the battery, for historical reasons it is usual to describe the direction of the current as being from the positive to the negative terminal (the so-called ‘conventional current’).
The energy of a battery is stored as chemical energy (see the focus idea Energy transformations). When it is connected to a complete circuit, electrons move and energy is transferred from the battery to the components of the circuit. Most energy is transferred to the light globe (or other energy user) where it is transformed to heat and light or some other form of energy (such as sound in iPods). A very small amount is transformed into heat in the connecting wires.
The voltage of a battery tells us how much energy it provides to the circuit components. It also tells us something about how hard a battery pushes the electrons in a circuit: the greater the voltage, the greater is the push (see the focus idea Using energy).
Explanation:
Answer:
Some of the snowball's initial kinetic energy is lost in form of frictional, heating or due to deformation of bodies, once inelastic collision has happened.
Hence, the kinetic energy of the snowball and sign after collision is less than the kinetic energy of the snowball before collision.
Explanation:
This collision, where the two bodies that collide and they stick together after collision is called inelastic collision.
The one where the two bodies don't stick together after collision is called elastic collision.
In elastic collision, both momentum and kinetic energy are conserved with the sum of each of these quantities before collision being equal to the sum after collision.
But, when it comes to inelastic collision, only momentum is conserved.
The kinetic energy isn't conserved as part of the initial kinetic energy is lost in some form to ensure that the the kinetic energy of the snowball plus sign system after collision is smaller compared to the kinetic energy of the snowball before collision.
The forms in which the kinetic energy is lost include through heating effects arising from a vibration of the atoms of the two bodies involved, through the deformation of either or both bodies etc.
Hope this Helps!!!
