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3 years ago

Which of these elements would be the best semiconductor? O Ar O Se O Rh O Po

Physics

1 answer:

Allushta [10]3 years ago

8 0

Answer:

Se would be the best semi conducter.

Explanation:

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My body is not just something that I have, my body is also I am

sertanlavr [38]

Answer:

thats pretty cool k byeeeeeeee

8 0

3 years ago

Read 2 more answers

An athlete at the Olympic Games runs at constant speed and covers the 100yard dash in 9.52s what will be his time for 100metre d

alex41 [277]

Answer:

His time for 100 meter distance running at the same speed is 10.42 s.

Explanation:

Given:

Distance covered in $t_{0}=9.52$ seconds, $d_{0}=100$ yd.

So, speed for running 100 yards is, $v_{0}=\frac{\textrm{Distance}}{\textrm{Time}}=\frac{100}{9.52}=10.5$

Now, new distance covered is, $d_{new}=100$ m.

The conversion factor for meter to yard is 1 m = 1.0936 yards

Therefore, new distance in yards is, $d_{new}=1.0936 \times 100=109.36\textrm{ yd}$

Speed is same which is equal to 10.5 yd/s.

Therefore, time taken to cover 109.36 yards is given as:

$t_{new}=\frac{d_{new}}{v_{0}}\\t_{new}=\frac{109.36}{10.5}=10.415\approx10.42\textrm{ s}$

Therefore, his time for 100 meter distance running at the same speed is 10.42 s.

5 0

3 years ago

A car accelerates uniformly in a straight line

kotegsom [21]

The car covers a distance d after time t of

d = (2.8 m/s²) t²

Solve for t when d = 69 m:

69 m = (2.8 m/s²) t²

t² = (69 m) / (2.8 m/s²)

t ≈ 4.96 s

6 0

4 years ago

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance, aft

8_murik_8 [283]

Answer:

Explanation:

Using the equation of motion v = u + at to get the speed at which the object would be travelling.

v is the final speed (in m/s)

u is the initial velocity (in m/s)

a is the acceleration (in m/s²)

t is the time taken (in secs)

Given parameters

u = 0m/s

t = 10s

a = g = 9.8m/s²

Substituting this values into the formula;

v = 0+9.8(10)

v = 0+ 98

v = 98m/s

Hence the rock will be travelling at a speed of 98m/s.

6 0

3 years ago

For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity o

Sati [7]

10.0 m/s + (-2.5 m/s) = 7.5 m/s

6 0

4 years ago