3 years ago

3.

Physics

1 answer:

nikitadnepr [17]3 years ago

8 0

The answer is
B:because

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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.

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3 years ago

#2 A car accelerates from rest at 4 m/s^2. What is the velocity of the car after 4 second?

solmaris [256]

You use the equation Velocity = Acceleration X Time. 4x4=16m/s.

The car travels 18m in 3 seconds.

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4 years ago

Is it true or false that all electromagnetic waves travel at the same speed in a vacuum?

Nady [450]

Truer words were never spoken.

The "speed of light" is also the speed of radio, the speed of microwaves,
the speed of heat, the speed of X-rays, etc.

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3 years ago

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A physical science test book has a mass of 2.2 kg what is the weight on mars??? please help

Nastasia [14]

Weight = (mass) x (gravity)
= (2.2 kg) x (3.7 m/s^2)

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3 years ago

Two satellites are in circular orbits around Earth. Satellite A has speed vA. Satellite B has an orbital radius nine times that

Pani-rosa [81]

Answer:

option B

Explanation:

given,

Satellite B has an orbital radius nine times that of satellite A.

R' = 9 R

now, orbital velocity of the satellite A

........(1)

now, orbital velocity of satellite B

from equation 1

hence, the correct answer is option B

8 0

3 years ago