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3 years ago

These waves are most harmful for living things.

Physics

1 answer:

scZoUnD [109]3 years ago

5 0

Explanation:

G. gamma rays because they are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.

hope this helps you

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According to the exercise principle of balance, a workout should __________.

xxMikexx [17]

a. address all components of fitness

According to the exercise principle of balance, a workout should address all components of fitness.
NOT:
b. focus on balance and coordination
c. target specific areas for improvement 
d. vary exercise activities over time

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3 years ago

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An "energy bar" contains 26 ggof carbohydrates.How much energy is this in joules?

Alekssandra [29.7K]

I’m it’s about 3.4878 energy in joules

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2 years ago

Which of the following describes a condition in which an individual would not hear an echo?

IrinaVladis [17]

If the echo (the reflected sound) reaches your ear less than about
0.1 second after the original sound, your brain doesn't separate them,
and you're not aware of the echo even though it's there.

If the echo comes from, say, a wall, 0.1 second means you'd have to be
about 17 meters away from the wall. If you're closer than that, then the
echo reaches you in less than 0.1 second and you're not aware of it.

A. 30 meters . . .
   No. You hear that echo easily

B. you're standing within range of both sounds . . .
   No. You hear that echo easily, if you're at least 17 meters from the wall.

C. less than 0.1 second later . . .
   That's it. The echo is there but your brain doesn't know it.

D. 21.5 meters
   No. You hear that echo easily.

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3 years ago

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A student is considering doing a complete repeated measures design experiment involving motor skills. The student's advisor has

Lelu [443]

Answer:

c. ABBA counterbalancing 

Explanation:

The student should not use the method because it is a progressive error management technique for each subject by introducing all treatment circumstances twice, first in one sequence, then in the other (AB, BA) by subject counterbalancing.

If participants experience conditions more than once, they experience the conditions first in one order, then the opposite order.

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3 years ago

A car travels 40 miles in 30 minutes.

lukranit [14]

Answer:

(a)Average velocity ,v =128.74 Km/hr

(b)Kinetic Energy , K=958546.875 Joule

(c)Distance, s=268.8m

(d)Acceleration, a= - 2.38 $m/s^2$

Explanation:

Given:

Distance travelled = 40 miles

Time taken = 30 minutes.

(A) The average velocity in kilometres/hour

Converting 40 miles into km ,

we know that,

1 mile = 1.60934

40 miles = 40 x 1.60934

so 40 miles = 64.3738 Km

similarly converting 30 minutes into hours

1 minute = $\frac{1}{60}hours$

30 minute = $\frac{30}{60}hours$

30 minute = $\frac{1}{2}hours$

Now

Average velocity = $\frac{Speed}{time}$

Substituting Values,

Average velocity = $\frac{64.3738}{\frac[1}{2}}$

Average velocity = $64.3738 \times 2$

Average velocity =128.74 Km/hr

(B) If the car weighs 1.5 tons, what is its If the car weighs 1.5 tons, what is its kinetic energy in joules (Note: you will need to convert your velocity to m/s)? in joules (Note: you will need to convert your velocity to m/s)?

Converting 1.5 tons into kg we get

1 ton = 1000 kg

so 1.5 ton =1500 kg

converting velocity to m/s

$128.74 \times \frac{5}{18}$