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nexus9112 [7]
3 years ago
13

Which statement is true for a sound wave entering an area of warmer air

Physics
2 answers:
Reika [66]3 years ago
8 0
That waves travel faster than the wave lenght!
kotegsom [21]3 years ago
7 0
The sound is transferred by collisions of molecules. Therefore sound waves will travel faster on warm air because collisions of molecules of air in warm air are greater.
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A ball traveling at a speed ν0 rolls off a desk and lands at a horizontal distance x0 away from the desk, as shown in the figure
klasskru [66]

Answer:

3x_0

Explanation:

The horizontal distance covered by the ball in the falling is only determined by its horizontal motion - in fact, it is given by

d=v_x t

where

v_x is the horizontal velocity

t is the time of flight

The time of flight, instead, is only determined by the vertical motion of the ball: however, in this problem the vertical velocity is not changed (it is zero in both cases), so the time of flight remains the same.

In the first situation, the horizontal distance covered is

d=v_0 t = x_0

in the second case, the horizontal velocity is increased to

v_x' = 3v_0

And so the new distance travelled will be

d' = v_x' t = 3 v_0 t = 3 x_0

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5 0
3 years ago
Questions E6 a& b and E7 a&b?
erica [24]

Explanation:

6a) Work = force × distance

W = Fd

W = (60 N) (10 m)

W = 600 J

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ΔKE = 600 J

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KE = ½ mv²

KE = ½ (0.4 kg) (25 m/s)²

KE = 125 J

7b) Work = change in energy.  When the ball is stopped, it has zero kinetic energy.

W = ΔKE

W = 0 J − 125 J

W = -125 J

8 0
3 years ago
A car speeds up from 13 m/s to 23 m/s in 30 seconds. What is the
Lapatulllka [165]

acceleration of the car = 0.33 m/s²

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Learn more about:

acceleration

brainly.com/question/4134594

brainly.com/question/1213762

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3 years ago
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deff fn [24]
Formula for acceleration

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Would a pair of scissors with really long blades and a short handle be practical? Why or why not?
Lana71 [14]
Yes, for balance.hope this helped.

6 0
3 years ago
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