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2 years ago

A billiard ball rolls from rest down a smooth ramp that is 8.0 m long. the acceleration of the ball is constant at 2.0?

Physics

1 answer:

Sergeeva-Olga [200]2 years ago

7 0

Sbsbbsbsbsbb jsjshbsbd. Disbanded. En

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5N 5 N 19 N 19 N Pls help look at the pic

snow_lady [41]

Answer:

b. is the correct answer ....

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2 years ago

A net force of 1.6×10−15 N acts on an electron over a displacement of 5.0 cm, in the same direction as the net force. (a) What i

Margaret [11]

Explanation:

It is given that,

Net force acting on the electron, $F=1.6\times 10^{-15}\ N$

Displacement, d = 5 cm = 0.05 m

(a) Let $\Delta E$ is the change in kinetic energy of the electron. It can be calculated using work energy theorem. Mathematically, it is given by :

$W=\Delta E$

$\Delta E=F\times d$

$\Delta E=1.6\times 10^{-15}\ N\times 0.05\ m$

$\Delta E=8\times 10^{-17}\ J$

(b) Initial speed of the electron, u = 0

Again using the work energy theorem as :

$E=\dfrac{1}{2}m(v^2-u^2)$

$E=\dfrac{1}{2}m(v^2)$

$v=\sqrt{\dfrac{2E}{m}}$

$v=\sqrt{\dfrac{2\times 8\times 10^{-17}}{9.1\times 10^{-31}}}$

$v=1.32\times 10^7\ m/s$

Hence, this is the required solution.

7 0

2 years ago

28. The mass of a steel building frame is 5500 kg. What power is used to raise it to a helght of 5.0 m If the work is done in 12

vodka [1.7K]

Answer:

2292W

Explanation:

Use the formula for energy first:

$E=D*M$

Where E = Energy || D = Distance || M = Mass.

Solve that equation:

E = 5 * 5500 ==> 27500J

To find power, divide energy per time:

27500J / 12s =~ 2292W

Did it in a rush, any problems message me

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2 years ago

Three children are riding on the edge of a merry‑go‑round that has a mass of 105 kg and a radius of 1.40 m . The merry‑go‑round

Irina18 [472]

Answer:

new angular velocity is 25.20 rpm

Explanation:

Given data

mass = 105 kg

radius = 1.40 m

spinning = 20.0 rpm

masses = 22.0 , 28.0 and 33.0 kg

to find out

new angular velocity

solution

we apply here conservation momentum

L initial = L final .........1

we know Ip = 1/2 mr² = 1/2 × 105 ×1.4² = 102.9 kg/m³

and for children initial I(i) = ( 33 + 28 + 22 )= 83 × 1.4² = 162.68 kg/m²

and I(f) children final = 33+ 22 = 55 × 1.4² = 107.80 kg/m²

so as that from equation 1

Ip + I(i) × 20 = Ip × I(f) × ω

(102.9 + 162.68 ) × 20 = (102.9 + 107.80 ) × ω

ω = 25.209302

so new angular velocity is 25.20 rpm

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2 years ago

True or false. The difference in solar energy receives at different latitudes drives atmospheric circulation

Paul [167]

Answer:

True

Explanation:

I studied this

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1 year ago

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