PHYSICS HIGH SCHOOL

During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the sprinter’s average acceleration during this period?

Answers

Answer 1

Answer:

Answer:

$\boxed {\boxed {\sf 2 \ m/s^2}}$

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

$a=(\Delta v)/(t)$

The time is 1.25 seconds. The change in velocity is the difference between the initial velocity and the final velocity.

$\Delta v=v_f-v_i$
The final velocity is 7.5 m/s and the initial velocity is 5.0 m/s
$\Delta v =7.5 \ m/s-5.0 \ m/s=2.5 \ m/s$

$\Delta v= 2.5 \ m/s\nt=1.25 \ s$

Substitute the values into the formula.

$a=(2.5 \ m/s)/(1.25 \ s)$

Divide.

$a=2 \ m/s^2$

The sprinter's average acceleration is 2 meters per second squared.

Answer 2

Answer:

Answer: 2 m/s^2

Explanation: Hope this helps :)

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A 1.7-kg block of wood rests on a rough surface. A 0.011-kg bullet strikes the block with a speed of 670 m/s and embeds itself. The bullet-block system slides forward 2.4 m before coming to rest.

Answers

What is the coefficient of kinetic friction between the block and the surface? Express your answer using two significant figures.

Answer:

0.39

Explanation:

Given information

m1=1.7 Kg

m2=0.011 Kg

v2=670 m/s

d=2.4 m

m2v2=(m1+m2)v hence $v=\frac {m2v2}{m1+m2}$ and also $a=\frac {v^(2)}{2d}$

The deceleration due to friction is given by

$F=\mu_k N=\mu_k W=\mu_k (m1+m2)g$

$F=(m1+m2)a=\mu_k (m1+m2)g$ therefore $a=\mu_k g$

Therefore, $a=\frac {v^(2)}{2d}=\mu_k g$

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How many miles can you get on one tank of gas if your tank holds 18 gallons and you get 22 miles per gallon?

Answers

Multiply the two. The units will cancel out. 22 miles per gallon can be expressed as 22 miles / 1 gallon, so you can write the following:
18 gallons * 22 miles / 1 gallon
Which simplifies to 18 * 22 miles = 396 miles.

Answer: 18*22=396

Explanation:

18*22=

(10*22) + (8*22)=

220+176=396

When you drive from the city to a distant farm, the temperature gets because of the ?

Answers

Answer:

Cooler

Explanation:

when you drive from city to farm the temperature of the farm is cooler than the temperature in the city.

this is because in city the population is very high as compare to the farms so, the activity of the city is also high which lead to increase the energy consumption of the area.

air pollutants, green house gases are also present more in the city which leads to increase the temperature of the city.

this effect is called urban heat island effect.

Cooler, urban heat island effect.

a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s.The distance between the house and school is 100m. Find his average velocity.... with explaination please

Answers

Explanation:

time spent to run from house to school=100/5=20s

time spent to return from school=100/10=10s

average velocity=200m/(10+20)

=6.66m/s

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Answers

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D. The SI system, which is based on the metric system, has been more widely adopted than the English system, which is harder to use.

Answers

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