Answer:
A)247.4kgm/s b) 3299.0N
Explanation:
The potential energy of the victim = mgh where m is mass, g is acceleration due to gravity and h is height from where the victim fell
Pe = 79*9.81*0.5 = 1/2mv2 (kinetic energy of the motion) v is speed in m/s
v = √9.81 = 3.132m/s
Change in momentum of the victim = m(vi-vf)
Vi is zero and vf is the velocity of impact
Change in momentum = 79*(3.132-0) = 247kgm/s which also the impulse
B) average force x time = impulse = 247
Average force = 247/0.075 = 3299.04N
Answer:
Here
Length (l) = 6 m
height (h) = 3 m
Load(L) = 500 N
Effort (E) = ?
we know the principal that
E * l = L * h
6 E = 500 * 3
6E = 1500
E = 250
therefore 250 N work is done on the barrel.
Explanation:
Pressure due to the weight of a liquid of constant density is given by p=ρgh p = ρ g h , where p is the pressure, h is the depth of the liquid, ρ is the density of the liquid, and g is the acceleration due to gravity
Answer:. Option c
Explanation: the speed of an electromagnetic wave is simply the vector product of the magnetic field and the electric field.
The direction of the velocity is the direction of the electromagnetic wave.
The wave is already moving towards the negative y axis (-j) and the magnetic field is already pointing towards the positive x axis (i)
From cross product of unit vectors
i × j = k
i × k = - j
With the second identity, we can see that the electric field will be pointing towards the positive of the x axis (k).
Option c is validated
Answer: The force of attraction that holds two molecules is a chemical bond
Explanation:
What is Chemical bonds?
Chemical bonds are forces that hold atoms together to make compounds or molecules.
Types of chemical bonds
Chemical bonds include
1.covalent,
2. polar covalent, and
3. ionic bonds.
Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bonds.
