Individuals with favorable traits are ________ in an environment

Physics

1 answer:

77julia77 [94]3 years ago

6 0

Succesful is correct.

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Sound travels slower in colder air than it does in warmer air. Make a claim about the effect of air temperature on the speed of

vladimir1956 [14]

Answer: The temperature of the air affects the speed of sound in the due to the fact that colder contains air molecules with low kinetic energy. For warm air the kinetic energy of the molecules is high causing them to move in rapid motion. Because of these vibrations and collisions sound waves moves in a faster rate.

Explanation:

8 0

3 years ago

Bart runs up a 2.91 meters high flight of stairs at a constant speed in 2.15 seconds. If barts mass is 65.9kg determine the work

Tanzania [10]

Answer:

1879.33J

874.1W

Explanation:

Given parameters:

Distance covered = 2.91m

Time taken = 2.15s

Mass of Bart = 65.9kg

Unknown:

Work done = ?

Power rating = ?

Solution:

Here, the work done is related to the the potential energy in climbing this flight of stairs.

Work done = Potential energy = mgH

where m is the mass

g is the acceleration due to gravity

H is the height

Work done = 65.9 x 9.8 x 2.91 = 1879.33J

Power is defined as the rate at which work is being done.

Power = $\frac{Work done }{time taken}$

= $\frac{1879.33}{2.15}$

= 874.1W

6 0

3 years ago

Katelyn (55 kg) is practicing a drop jump in the biomechanics lab. She steps off a plyometrics box, lands on the force plate, an

suter [353]

Answer:

J = 357.5 kg*m/s

Explanation:

The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:

$p_{o} = m*v_{o} = 55 kg * (-3.0 m/s) (1)$