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3 years ago

Which explains how fossils for used as evidence about the theory of continental drift

2 answers:

8 0

Scientist use fossils because they put them in one area but find them halfway across the world meaning there use to be animals moving around and couldn't have swam across the sea so it shows everything was once together, Pangaea, and animals moved across the land before it split.

AleksandrR [38]3 years ago

4 0

When the continental drift occured, it moved all the land on earth around, therefore changing climates. If fossils of animals are found on a certain continent that doesn't support that species, it proves the drift happened because the climate used to be suitable for them, but now is not.

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Which of the following is a sign of a physical Change ?

guapka [62]

C.) i believe because the change in shape is changing the physical appearance

7 0

4 years ago

Read 2 more answers

Two cars are traveling along perpendicular roads, car A at 40 mi/hr, car B at 60 mi/hr. At noon, when car A reaches the intersec

Serggg [28]

Answer:

$\frac{dD}{dt} = -4 miles/hour$

negative sign indicates that the distance is decreasing with time

Explanation:

Let at any time t after noon that is 12 p.m.

distance traveled by car A = 40t

distance traveled by car B = 90-60t

then distance between the two cars at time t

$D^2= (40t)^2+(90-60t)^2$ ............1

also, at time 1 p.m.

distance $D^2= (40\times1)^2+(90-60\times1)^2$

D=50 Km

differentiating equation 1 w.r.t. t we get

$2D\frac{dD}{dt}= 2\times40t\times40+2(90-60t)(-60)$

put t= 1 and D= 50 we get

$2\times50\frac{dD}{dt}= 3200\times1-3600\times1$

$\frac{dD}{dt} = -4 miles/hour$

3 0

3 years ago

Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 8.0 s, it rotates 35 rad.

Harman [31]

Answer:

(a) 1.093 rad/s^2

(b) 4.375 rad/s

(d) 67.845 rad

Explanation:

initial angular velocity, ωo = 0

time, t = 8s

angular displacement, θ = 35 rad

(a) Let α be the angular acceleration.

Use second equation of motion for rotational motion

$\theta =\omega _{0}t+\frac{1}{2}\alpha t^{2}$

By substituting the values

35 = 0 + 0.5 x α x 8 x 8

α = 1.093 rad/s^2

(b) The average angular velocity is defined as the ratio of total angular displacement to the total time taken .

Average angular velocity = 35 / 8 = 4.375 rad/s

Use first equation of motion for rotational motion

ω = ωo + αt

ω = 0 + 1.093 x 8 = 8.744 rad/s

(d) Let in next 5 seconds the angular displacement is θ.

$\theta =\omega _{0}t+\frac{1}{2}\alpha t^{2}$

By substituting the values

θ = 8.744 x 5 + 0.5 x 1.093 x 5 x 5

θ = 67.845 rad

8 0

3 years ago

A circular conical reservoir has depth 20 feet and radius of the top 10 feet. water is leaking out so that the surface is fallin

levacccp [35]

As per given condition we know that vertex angle of the cone is given as

$tan\theta = \frac{R}{H}$

so here we can say that vertex angle will remain constant

so here

$\frac{r}{y} = \frac{R}{H}$

$\frac{r}{8} = \frac{10}{20}$

$r = 4 feet$

now for the volume we can say

$V = \frac{1}{3}\pi r^2 y$

also we can say

$r = \frac{y}{2}$

so here we will have

$V = \frac{1}{3}\pi (\frac{y}{2})^2y = \frac{1}{12}\pi y^3$

now for volume flow rate

$Q = \frac{dV}{dt} = \frac{3}{12}\pi y^2\frac{dy}{dt}$

$Q = \frac{1}{4}\pi y^2 v_y$

now plug in all data

$Q = \frac{1}{4} \pi (8)^2 (12) ft^3/h$

$Q = 603.2 ft^3/h$

4 0

3 years ago

How much weight can a 2x2 support horizontally?

Charra [1.4K]

I got 35 lbs because your doubling the support

4 0

3 years ago