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2 years ago

What bone helped the scientists figure out that the Pakicetus was an ancestor of modern whales

Physics

1 answer:

lukranit [14]2 years ago

8 0

Answer:

B.

Cranium

Explanation:

Hope this helps:)

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Can anybody help me solve this problem? Thank you so much!

ser-zykov [4K]

Please ignore my comment -- mass is not needed, here is how to solve it. pls do the math

at bottom box has only kinetic energy
ke = (1/2)mv^2
v = initial velocity
moving up until rest work done = Fs
F = kinetic fiction force = uN = umg x cos(a)
s = distance travel = h/sin(a)
h = height at top
a = slope angle
u = kinetic fiction
work = Fs = umgh x cot(a)
ke = work (use all ke to do work)
(1/2)mv^2 = umgh x cot(a)
u = (1/2)v^2 x tan (a) / gh

4 0

2 years ago

The atomic radii of Mg2+ and F- ions are 0.072 and 0.133 nm, respectively.(a) Calculate the force of attraction between these tw

timurjin [86]

Answer:

$1.09527\times 10^{-8}\ N$

Explanation:

$q_1$ = Mg ion = $+2q$

$q_2$ = F ion = $-q$

q = Charge of electron = $1.6\times 10^{-19}\ C$

r = Distance between ions = $0.072+0.133\ nm$

k = Coulomb constant = $8.99\times 10^{9}\ Nm^2/C^2$

Electrical force is given by

$F=-\dfrac{kq_1q_2}{r^2}\\\Rightarrow F=-\dfrac{8.99\times 10^9\times 2\times 1.6\times 10^{-19}\times -1\times 1.6\times 10^{-19}}{[(0.072+0.133)\times 10^{-9}]^2}\\\Rightarrow F=1.09527\times 10^{-8}\ N$

The attractive force is $1.09527\times 10^{-8}\ N$

8 0

3 years ago

FastFood Nation author? Who is the author of FastFood Nation

Sindrei [870]

Answer:

Eric Schlosser

Explanation:

I am 100% sure this is the right answer hope it helped:)

7 0

2 years ago

A crane lifts a 425 kg steel beam vertically upward a distance of 614.4 m

Maru [420]

PHYSICS

*not sure about the answer but here we go*

Mass = 425 kg

distance = 614.4 m

acceleration = 1.8 m/s²

Answer :

Count Force first.

$f \: = m \: \times a$

F = 425 × 1,8

F = 765 N ✅

Now let's count Work.

$w \: = \: f \: \times s$

W = 765 × 614.4

W = 470016 J ✅

7 0

2 years ago

Which indicates arson - (pick 2) v shaped burn, multiple point of origin, U shaped burn pattern, pour pattern

viva [34]

Multiple point of origin & pour pattern

8 0

3 years ago