Answer:
See attached picture.
Explanation:
See attached picture for explanation.
I think b but I’m not completely sure
Answer:
t = 12.82s
Explanation:
F = m×a
= (70)×(2)
= 140 N
during the acceleration, the sprinter cover d = 29 m with time:
d = 1/2×at
29 = 1/2×(2)×t^2
t^2 = 29s
t = 5.39s
and attains the velocity of:
v = a×t
= 2×5.39
= 10.77 m/s
Then,to cover the last x = 80 m with a speed of 10.77 m/s in time:
t = x/v
= 80/10.77
= 7.43s
Therefore, it will take the sprinter 7.43 + 5.39 = 12.82s
Answer: <u><em>C. Steel</em></u>
Explanation: <em><u>When a sound wave travels through a solid body consisting</u></em>
<em><u /></em>
<em><u>of an elastic material, the velocity of the wave is relatively</u></em>
<em><u /></em>
<em><u>high. For instance, the velocity of a sound wave traveling</u></em>
<em><u /></em>
<em><u>through steel (which is almost perfectly elastic) is about</u></em>
<em><u /></em>
<em><u>5,060 meters per second. On the other hand, the velocity</u></em>
<em><u /></em>
<em><u>of a sound wave traveling through an inelastic solid is</u></em>
<em><u /></em>
<em><u>relatively low. So, for example, the velocity of a sound wave</u></em>
<em><u /></em>
<em><u>traveling through lead (which is inelastic) is approximately</u></em>
<em><u /></em>
<em><u>1,402 meters per second.</u></em>
<em><u /></em>
<u><em /></u>
Answer:
The speed of bullet and wooden bock coupled together, V = 22.22 m/s
Explanation:
Given that,
Mass of the bullet, m = 0.04 Kg
Mass of the wooden block, M = 0.5 Kg
The initial velocity of the bullet, u = 300 m/s
The initial velocity of the wooden block, U = 0 m/s
The final velocity of the bullet and wooden bock coupled together, V = 0 m/s
According to the conservation of linear momentum, the total momentum of the body after impact is equal to the total momentum before impact.
Therefore,
mV + MV = mu + MU
V(m+M) = mu
V = mu/(m+M)
Substituting the values in the above equation,
V = 0.04 Kg x 300 m/s / (0.04 Kg+ 0.5 Kg)
= 22.22 m/s
Hence, the speed of bullet and wooden bock coupled together, V = 22.22 m/s
