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3 years ago

2-Pema runs

Physics

1 answer:

Oxana [17]3 years ago

4 0

Answer:

20 m/s

Explanation:

Distance covered by man =500m

Time taken by man=25 seconds

Speed of man = distance/time

= 500/25

=20 m/s

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In what way did scientists Jonas Salk and Albert Sabin influence society? They generated plastics for increased manufacturing. T

faltersainse [42]

They discovered a vaccine to reduce illnesses, specifically Polio and Influenza. The work of Salk and Sabin has almost eradicated what was once a deadly disesase ( polio) . For example, there were 350,000 deaths related to poliovirus across the world in 1988 and they reduced to 22 in 2017. Also, their work has saved millions of lives from polio induced paralysis

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3 years ago

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Which characteristic do all minerals have in common?

Korolek [52]

Answer:

Five Characteristics of a Mineral

Minerals Are Natural. You must find minerals in nature; substances concocted in laboratories don't qualify. ...

Minerals Are Inorganic. ...

Minerals Are Solids. ...

Definite Chemical Composition. ...

Crystalline Structure.

These are just some examples.

Explanation:

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3 years ago

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You are presented with several wires made of the same conducting material. The radius and drift speed are given for each wire in

jekas [21]

$\begin{array}{ccc}&\text{Radius} & \text{Drift Speed}\\d) & 2 \; r &2.5 \; v\\a) & 3 \; r &1 \; v\\b) & 4 \; r &0.5 \; v\\c) & 1 \; r &5 \; v\\\end{array}$

<h3>Explanation</h3>

$I = v \cdot A \cdot n \cdot q$ ,

where

$I$ is the current;
$v$ is the drift speed;
$A$ is the cross-section area of the wire,
$n$ is the number of charge carrier per unit volume, and
$q$ is the charge on each charge carrier.

Area of a circular cross-section:

$A = \pi \cdot r^{2}$ ,

where

$r$ is the radius of the wire.

$n$ and $q$ are the same for all four samples, for they are made out of the same material.

As a result, $I$ of each wire is directly proportional to $v \cdot r^{2}$ where the value of $\pi \cdot n \cdot q$ is constant.

For each of the four wires:

$\begin{array}{ccc|c}\\& r & v &I \propto v\cdot r^{2}\\a) & 3 & 1 & 9\\b) & 4 & 0.5 & 8\\c) & 1 & 5 & 5\\d) & 2 & 2.5 & 10\\\end{array}$ .

How do the four wires rank by their current?

d > a > b > c.

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4 years ago

When holes are drilled through the wall of a water tower, water will spurt out the greatest horozontal distance from the hole cl

Mnenie [13.5K]

Bottom of the water tower

Explanation:

When holes are drilled through the wall of a water tower, water will spurt out the greatest horizontal distance from the hole closest to the bottom of the water tower.

This is because the near the bottom of the tower is the greatest compared to other parts of the tower.

The pressure increases with depth.
As the depth of water increases, the column of water above exerts more pressure on the one below.
Therefore, water will spurt out more from the bottom of the tower compared to the top of the tower.

Learn more:

Pressure brainly.com/question/4868239

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3 years ago

A boat initially traveling at 10. meters per second accelerates uniformly at the rate of 5.0 meters per second2 for 10. seconds.

guajiro [1.7K]

The initial speed of the boat is $v_0=10 m/s$
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4 years ago