3 years ago

Which of the following is an incorrect statement?

Physics

1 answer:

Natalija [7]3 years ago

5 0

Answer:

Explanation:

The mechanical advantage of a pulley with three ropes is one.

is incorrect. It is 3

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Which of the following surfaces reflects the most light?

Lunna [17]

Aluminum foil reflects more light

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4 years ago

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A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no f

joja [24]

Answer: C) 0 N

Explanation:

8 0

3 years ago

If a force of 8 N acts on a mass of 2 kg for a period of 24 seconds, what was the magnitude of the impulse given to the mass?

lyudmila [28]

Answer:

192Ns

Explanation:

The following were obtained from the question:

M = 2kg

F = 8N

t = 24secs

Impulse =?

Impulse = Ft

Impulse = 8 x 24 = 192Ns

5 0

3 years ago

You are on the roof of the physics building of your school, 46.0 m above the ground. Your physics professor, who is 1.80 m tall,

Elena L [17]

Answer:

The professor should be 3.60 meters away from the place where the egg would fall.

Explanation:

To calculate this first we need to calculate the time it would take for the egg to fall the distance from the roof to the professor's head (46m-1.8m=44.2m).

The formula for free fall is:

y=1/2*g* $t^{2}$

solving for t it would be

$\sqrt{\frac{y}{g*1/2}} =t$

replacing

$\sqrt{\frac{44.2m}{9.8m/s^2*1/2}} = t = 3.00s$

Now that we have the time it would take the egg to get from the roof to the desired height we need to calculate the distance the professor would travel in that time so we know to release the egg when he's exactly at that distance.

Since he is traveling at a constant speed the formula is

x=v*t

replacing

1.20m/s * 3.00 s = x = 3.60 m

8 0

3 years ago

A uniform rod of length L rests on a frictionless horizontal surface. The rod pivots about a fixed frictionless axis at one end.

Svet_ta [14]

Answer: a) 0.315 (V/L)

Explanation:

From Conservation of angular momentum, we know that

L1 = L2 ,

Therefore MV L/2 = ( Irod + Ib) x W

M/4 x V x L/2 = (M (L/2)^2 + 1/3xMxL^2) x W

M/8 X VL = (ML^2/16 + ML^2 /3 )

After elimination we have,

V/8 = 19/48 x L x W

W = 48/8 x V/19L = 6/19 x V/L

Therefore W = (0.136)X V/L

6 0

3 years ago