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3 years ago

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You know that Alfred Wegener’s ideas were not immediately accepted. What evidence was found that convinced his contemporaries (p

eople who lived at the same time he lived) to eventually begin to accept his theory of continental drift?

1 answer:

Debora [2.8K]3 years ago

7 0

Answer:

The apparent fit of the eastern coastline of South America and western coastline of Africa

Similarities of plants and animal fossils in South America and some parts of African continent which were separated by a vast ocean

Similarities in the sequence of rock layers of opposite sides of the Atlantic Ocean

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A motorist traveling at 17 m/s encounters a deer in the road 46 m ahead. If the maximum acceleration the vehicle’s brakes are ca

AveGali [126]

Answer:

$t = 1.29 s$

Explanation:

Maximum distance after which the motorist must have to stop is given as

$d = 46 m$

now the distance after which the vehicle will stop on applying breaks is given as

$v_f^2 - v_i^2 = 2 a d$

$0 - 17^2 = 2(-6) d$

$d = 24.1 m$

now remaining distance is given as

$x = 46 - 24.1$

$x = 21.9 m$

now reaction time is given as

$t = \frac{x}{v}$

$t = \frac{21.9}{17}$

$t = 1.29 s$

5 0

3 years ago

A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4 N. The buoyant force

Sauron [17]

Answer:

The acceleration is 2.448 meters per square second and is vertically upward.

Explanation:

The Free Body Diagram of the plastic ball in the liquid is presented in the image attached below. By Second Newton's Law, we know that forces acting on the plastic ball is:

$\Sigma F = F - m\cdot g = m\cdot a$ (1)

Where:

$F$ - Buoyant force, measured in newtons.

$m$ - Mass of the plastic ball, measured in kilograms.

$g$ - Gravitational acceleration, measured in meters per square second.

$a$ - Net acceleration, measured in meters per square second.

If we know that $F = 5\,N$ , $m = 0.408\,kg$ and $g = 9.807\,\frac{m}{s^{2}}$ , then the net acceleration of the plastic ball is:

$a = \frac{F}{m} - g$

$a= 2.448\,\frac{m}{s^{2}}$

The acceleration is 2.448 meters per square second and is vertically upward.

4 0

3 years ago

The following statement is false. An atom can be broken into smaller atoms. Reword the statement so it is true.

Softa [21]

Answer:

an atom can not be broken into smaller pieces

Explanation:

4 0

4 years ago

Using a radar gun, you emit radar waves at a frequency of 6.2 GHz that bounce off of a moving tennis ball and recombine with the

Keith_Richards [23]

Answer:

23.4 m/s

Explanation:

f = actual frequency of the wave = 6.2 x 10⁹ Hz

$f_{app}$ = frequency observed as the ball approach the radar

$f_{rec}$ = frequency observed as the ball recede away from the radar

V = speed of light

$v$ = speed of ball

B = beat frequency = 969 Hz

frequency observed as the ball approach the radar is given as

$f_{app}=\frac{f(V+v)}{V}$ eq-1

frequency observed as the ball recede the radar is given as

$f_{rec}=\frac{f(V-v)}{V}$ eq-2

Beat frequency is given as

$B = f_{app} - f_{rec}$

Using eq-2 and eq-1

$B = \frac{f(V+v)}{V}- \frac{f(V-v)}{V}$

inserting the values

$969 = \frac{(6.2\times 10^{9})((3\times 10^{8})+v)}{(3\times 10^{8})}- \frac{(6.2\times 10^{9})((3\times 10^{8})-v)}{(3\times 10^{8})}$

$v$ = 23.4 m/s

8 0

3 years ago

What is the definition of Newton and could you leave an example of it too?

vichka [17]

What is the definition of newton

7 0

3 years ago