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2 years ago

5

A wave travels from Medium 1 (light like slinky) into Medium 2 (heavy and rigid like snakey). Which property or properties of th

e wave is the same for both media

1 answer:

hjlf2 years ago

4 0

Answer:

ohhhhhhhhhhhhhhhhjhhhhhhh

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Can someone explain kinetic friction and give an example?

ryzh [129]

Kinetic friction happens when there is kinetic energy and it is coming into contact with another source. ex: a ball rolling.

4 0

3 years ago

N 4. Which of the following can cause a short circuit?

user100 [1]

Answer:

pretty sure its A

Explanation:

please give brainliest if i'm correct

7 0

2 years ago

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. The y-velocity is determined

julia-pushkina [17]

initial speed of the ball by which it is kicked is 8 m/s

now the angle at which it is kicked is 20 degree

here we will have

$v_y = v sin20$

$v_y = 8 sin20 = 2.74 m/s$

now we will have

$\Delta y = v_y t + \frac{1}{2}at^2$

so if the ball again land on the ground at same level then we have

$\Delta y = 0$

$0 = 2.74 t - \frac{1}{2}(9.8) t^2$

$0 = 2.74 - 4.9 t$

$t = 0.56 s$

so total time will be 0.56 s

8 0

3 years ago

A sound source of frequency f moves with constant velocity (less than the speed of sound) through a medium that is at rest. A st

ANTONII [103]

Answer:

The correct answer is d

Explanation:

In this exercise they ask us which statement is correct, for this we plan the solution of the problem, this is a Doppler effect problem, it is the frequency change due to the relative speed between the emitter and the receiver of sound.

The expression for the Doppler effect of a moving source is

f ’= (v / (v- + v_s) f

From this expression we see that if the speed the sound source is different from zero feels a change in the frequency.

The correct answer is d

7 0

3 years ago

A man drags a 71-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The

Flura [38]

Answer:

T = 540 N (to two significant digits)

Explanation:

Let the crate dimension L be from strap attachment to floor contact

Let T be the strap tension

sum moments about the floor contact point to zero

mg[½Lcos25] - Tsin61[Lcos25] + Tcos61[Lsin25] = 0

L is common to all terms, so divides out.

½(71)(9.8)cos25 = T(sin61cos25 - cos61sin25)

T = (71)(9.8)cos25 / (2(sin61cos25 - cos61sin25))

T = 536.428020...

7 0

3 years ago