Answer:
Explanation:
Convert mass of bullet 50g in kg
✯ Divide 50 by 1000
⟹ 50/1000
∴ 0.05 kg
Q = mass water x specific heat water x delta T.
<span>714,000 = mass water x specific heat water x 30.
Substitute specific heat water and solve for mass water.</span>
Answer:
The time of the impact , T = 0.2 sec.
Initial velocity of Rocky's punch during that time, u = 90
Explanation:
Given, rocky punches with a force, F = 225 N.
And impulse created, P = 45 Ns.
Impulse, P = force × time of impact = F × T.
so, Time of impact, T = =
T = = 0.2 s.
Impulse is also change in momentum,
P = m(v - u). where, m = mass of the hand.
v = final velocity.
u = initial velocity.
Given that Rocky's hand comes to stop when he strikes the gut,
so, v = 0.
⇒ m × u = 45 Ns.
⇒ u = =
u = 90
Answer:
Overall velocity of a person is 1.66
Explanation:
Let the forward displacement of the person is taken as positive and backward displacement is taken as negative.
You walk forward 10 meters,
displacement = = 10 meter
You walk backward 5 meters,
displacement = = -5 meter
You walk forward 10 meters,
displacement = = 10 meter
Total displacement = s =
s = 15 -5 +15
s = 25 meter
Total time taken is given by,
t = 15 second
Overall velocity is the average velocity of a person and it is given by,
Average velocity =
Average velocity =
Average velocity = 1.66
Thus, overall velocity of a person is 1.66
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