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3 years ago

A marble is flicked off the edge of a table. The motion of the marble follows a parabolic path.

2 answers:

8 0

The answer would be D. one force is that gravity is pushing the marble either down or up another one is when it is flicked

Hoped this helped
Sorry if i am wrong
Happy studying

3241004551 [841]3 years ago

3 0

D Two instantaneous forces are acting on the marble.

One of which is drag, or air resistance, casing the marble to slow down, and the other is gravity, which like a bullet becomes more effective when the projectile gets slower. Unless in reaches terminal velocity if there is no ground for it to hit of course.

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Que volumen ocupan 0.4kg de alcohol, cual es el peso de este volumen

Ugo [173]

Answer: I don't know spanish

Explanation:

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3 years ago

A block is launched up a frictionless 40° slope with an initial speed v and reaches a maximum vertical height h. The same block

Strike441 [17]

Answer: 1. h

Explanation:

The block would reach exactly the same height from the ground. It would travel a greater distance away from the source, but the height away from the earth would remain the same as you are giving it the same energy each time. Therefore, it will reach the same gravitation potential energy.

Another approach to look at it this is seeing it when the Block moves up the slope, its kinetic energy decreases and the potential energy increases. In both cases, the kinetic energy decreases by same amount, therefore the block rises to same height H.

Try to use the formula;

1/2MV2 = mgh

Where V = √(2gh)

I hope this helps

3 0

3 years ago

A child is swinging back and forth with a constant period and amplitude. Somewhere in front of the child, a stationary horn is e

Amanda [17]

Answer:

Explanation:

We shall apply concept of Doppler's effect of apparent frequency to this problem . Here observer is moving sometimes towards and sometimes away from the source . When observer moves towards the source , apparent frequency is more than real frequency and when the observer moves away from the source , apparent frequency is less than real frequency . The apparent frequency depends upon velocity of observer . The formula for apparent frequency when observer is going away is as follows .

f = f₀ ( V - v₀ ) / V , f is apparent , f₀ is real frequency , V is velocity of sound and v is velocity of observer .

f will be lowest when v₀ is highest .

velocity of observer is highest when he is at the equilibrium position or at middle point .

So apparent frequency is lowest when observer is at the middle point and going away from the source while swinging to and from before the source of sound .

3 0

3 years ago

A piano wire with mass 3.00 g and length 80.0 cm is stretched with a tension of 25.0 N. A wave with frequency 120.0 Hz and ampli

lys-0071 [83]

Answer:

(a) $P_{avg}$ = 0.22 W

(b) $P_{avg,2}$ = 0.056 W

Explanation:

given information:

the mass of piano wire, m = 3.00 g = 0.003 kg

tension, F = 25 N

length, l = 80 cm = 0.8 m

frequency, f = 120 Hz

amplitude, A = 1.6 mm = 0.0016 m

(a) the average power carried by the wave, $P_{avg}$

$P_{avg}$ = $\frac{1}{2}$ (√μF)ω²A²

where,

ω = 2πf = 2π120 = 754 $s^{-1}$

μ = $\frac{m}{l}$

= $\frac{0.003}{0.8}$

= 0.00375 kg/m

thus,

$P_{avg}$ = $\frac{1}{2}$ (√(0.00375)(25))(754)²(0.0016)²

$P_{avg}$ = 0.22 W

(b) What happens to the average power if the wave amplitude is halved.

based on the equation above, we know that the average power is proportional to the square amplitude. therefore

$\frac{P_{avg,1} }{P_{avg,2} } = \frac{A_{1} ^{2} }{A_{2} ^{2} } }$

$\frac{P_{avg,1} }{P_{avg,2} } = \frac{A_{1} ^{2} }{(0.5A_{1} )^{2} } }$

$P_{avg,2}$ = $\frac{0.22}{4}$

$P_{avg,2}$ = 0.056 W

4 0

3 years ago

Which of the following items involve a wedge?

elena55 [62]

Answer:

Explanation:

Maybe your question is meant to be: which is not a wedge, because wedge is a combination of two inclined planes, use to separate bodies which are held together by large forces. Option A,B & C are all wedge except D.

8 0

3 years ago

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