3 years ago

Evaluate the importance of having a control group in a scientific investigation. help plzzz

1 answer:

7 0

The importance of having a control group is to see how much your other test subjects changed. You use the control to compare.

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a sample of an unknown gas (gas A) has a volume of 3.2 m3 at a temperature of 10 degrees C. Another sample of an unknown gas (ga

mina [271]

Assuming hat both gases obey charles' law at all temperatures are at the same pressure

3 0

3 years ago

A column of soldiers, marching at 114 steps per minute, keep in step with the beat of a drummer at the head of the column. It is

kipiarov [429]

Answer:

length of column is 140.42 m

Explanation:

in 1 min the soldiers travels 114 steps

so to complete 1 step the time taken by the soldiers =

t = $\dfrac{1\ min}{114}$

t = $\dfrac{60}{114}$

t = 0.526 s

speed of sound = 343 m/s

length of the column = v × t

= 343 m/s × 0.526 s

= 140.42 m

hence the length of column is 140.42 m

5 0

3 years ago

A car (mass = 1200 kg) is traveling at 31.1 m/s when it collides head-on with a sport utility vehicle (mass = 2830 kg) traveling

IrinaVladis [17]

Answer:

13.18 m/s

Explanation:

Let the velocity of sports utility car is

-u as it is moving in opposite direction.

mc = 1200 kg, uc = 31.1 m/s

ms = 2830 kg, us = - u = ?

Using conservation of momentum

mc × uc + ms × us = 0

1200 × 31.1 - 2830 × u = 0

u = 13.18 m/s

4 0

4 years ago

a truck is moving around a circular curve @ a uniform velocity of 13m/s. if the centifrical force on truck is 3,300N with truck

VMariaS [17]

<u>Answer</u>

81.94 m

<u>Explanation</u>

The centripetal force of an object moving in a circular path is given by:

F = mv²/r Where m is the mass of the object, v is the constant velocity and r is the radius of the curve.

F = mv²/r

3,300 = (1600×13²)/r

3,300 = 270,400/r

r = 270,400/3,300

= 81.94 m

8 0

3 years ago

A copper wire of diameter 0.80 mm fails at an engineering stress = 248.2 MPa. Its ductility is measured as 75% reduction of area

Anvisha [2.4K]

Answer:

true stress = 992.8 MPA

true strain = 1.386

Explanation:

see the attached file

4 0

3 years ago