Answer:
D. 520 N
Explanation:
According to the impulse theorem, the change in momentum of the ball is equal to the impulse exerted on the ball, mathematically:
where
is th change in momentum
F is the average force exerted on the ball
is the time of contact
The change in momentum of the ball is
where
m = 57 g = 0.057 kg is the mass of the ball
u = 45 m/s is the initial velocity
v = -33 m/s is the final velocity (in the opposite direction)
Substituting,
The time of the collision is
Therefore, the average force is
So, the magnitude is approximately 520 N.
Answer:
The percentage change in resistance of the wire is 69%.
Explanation:
Resistance of a wire can be determined by,
R = (ρl) ÷ A
Where R is its resistance, l is the length of the wire, A its cross sectional area and ρ its resistivity.
When the wire is stretched, its length and area changes but its volume and resistivity remains constant.
= 1.3l, and =
So that;
= (ρ) ÷ = (ρ × 1.3l) ÷ ()
= (1.3lρ) ÷ ()
= × [(ρl) ÷ A]
= 1.69R (∵ R = (ρl) ÷ A)
= 1.69R
Where is the new resistance, is the new length, and is the new area after stretching the wire.
The change in resistance of the wire = - R
= 1.69R - 1R
= 0.69R
The percentage change in resistance = × 100
= 0.69 × 100
= 69%
The percentage change in resistance of the wire is 69%.
Answer:
If the two forces applied to an object act in the same direction ,then the resultant force acting on the object is equal to the sum of two forces: When two forces act in the same direction their effective magnitude increases
Explanation:
Answer:
it can be used for communication, industrial application and also for instrumentation application
A) <span>Ivan does work when he lifts the basket
B) Work = Force * displacement
W = 20 * 2
W = 40 Joules
So, The Amount of work he does is 40 Joules
Hope this helps!</span>