Answer:
f=-1380N
Explanation:
A karate master wants to break a board by hitting the board swiftly with his hand. The master's hand has a mass of 0.30 kg, and as it strikes the board, his hand has a velocity of 23.3 m/s. The master contacts the board for 0.0050 seconds
.the concluding part to the question should be
What is the impact force (impulse) on the board?
solution
from the Newton's second law of motion which states that
the rate of change in momentum is directly proportional to the force applied
f=m(v-u)/t
f=0.3(0-23.3)/0.005
f=-1380N
f=force impact
m=mass of the karates master's hand
t=time for the impact
v=0m/s final velocity
u=initial velocity
Electric field lines of positive charges are always radially outwards
So here all field lines must have tendency to move out radially as well as two field lines never intersects with each other
So here field lines also do not intersects with each other
So overall the figure C is perfectly representing the field lines of two positive charges as these lines are not intersecting and also originating from two positive charges.
So answer must be
<u><em>FIGURE C</em></u>
Explanation:
Below is an attachment containing the solution.
Answer: tortoise
Explanation:
Given the following :
Speed of tortoise = 1m/s
Speed of hare = 3m/s
Mass of hare = 5kg
Mass of tortoise = 20kg
Momentum = product of Mass and velocity
Momentum of hare = mass of hare × Velocity of hare
Momentum of hare = 5kg × 3m/s = 15kgm/s
Momentum of tortoise = mass of tortoise × Velocity of tortoise
Momentum of tortoise = 20kg × 1m/s = 20kgm/s
Therefore, tortoise has a greater momentum than hare.
This heats up when an electric current passes through it, and produces light as a result. The resistance of a lamp increases as the temperature of its filament increases. The current flowing through a filament lamp is not directly proportional to the voltage across it.
