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3 years ago

Help me please

Physics

2 answers:

vodka [1.7K]3 years ago

7 0

#4 and #9 are true.
#10 is true IF it's an atom of Hydrogen.
The other 7 statements are false.

yarga [219]3 years ago

3 0

1. False
2.False
3.False
4.True
5. True
6. False
7.True
8.False
9. True
10. False

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Two hover pucks collide in an off-centered collision and stick to one another via velcro. When they do so, they rotate in place.

Tpy6a [65]

Answer:

They will rotate twice as fast

Explanation:

Angular momentum is product of

m= mass,

v=velocity

and

r= radius.

i-e

Angula Momentum = m×v×r=mvr

<u>If we increase mass</u>

Here we replace m with 2m and keep the size same i-e radius is kept constant !

==> Angular Momentum = 2m×v×r=2mvr

7 0

3 years ago

If the radius of a coinis 20cm, find its<br>surface area -

meriva

Answer:

800 $\pi$ cm²

Explanation:

Given parameters:

radius of the coin = 20cm

Unknown:

Surface area of the coin = ?

Solution:

A coin is made up of two faces;

Surface area = 2(πr²)

Insert the parameters and solve;

Surface area = 2( $\pi x 20^{2}$ )

Surface area = 800 $\pi$ cm²

8 0

2 years ago

the acceleration of a rocket traveling upward is given by a=(6+.02s)m/s^s, where s is in meters. Determine the rocket's velocity

NikAS [45]

Answer:

a) velocity v = 322.5m/s

b) time t = 19.27s

Explanation:

Note that;

ads = vdv

where

a is acceleration

s is distance

v is velocity

Given;

a = 6 + 0.02s

so,

$\int\limits^s_0 {a} \, ds = \int\limits^v_0 {v} \, dv\\ \int\limits^s_0 {6+0.02s} \, ds = \int\limits^v_0 {v} \, dv\\ 6s + \frac{0.02s^{2} }{2} = \frac{1}{2} v^{2} \\v = \sqrt{12s + 0.02s^{2} } .....................1 \\\\\\$

Remember that

$v = \frac{ds}{dt} \\\frac{ds}{v} = dt\\\int\limits^s_0 {\frac{ds}{\sqrt{12s+0.02s^{2} } } } \, ds = \int\limits^t_0 {} \, dt \\t= (5\sqrt{2} ) ln \frac{| [s + 300 + \sqrt{(s^{2} + 600s)} ] |}{300} .......2$

substituting s = 2km =2000m, into equation 1

v = 322.5m/s

substituting s = 2000m into equation 2

t = 19.27s

8 0

3 years ago

Pls help me guys simple question

Airida [17]

Answer:

please write neater

Explanation:

can you write neater so I can answer th question but also is a equal to b

7 0

3 years ago

A yellow train of mass 100 kg is moving at 8 m/s towards an orange train of mass 200 kg traveling on the opposite direction on t

vladimir1956 [14]

Mass of yellow train, my = 100 kg

Initial Velocity of yellow train, = 8 m/s

mass of orange train = 200 kg

Initial Velocity of orange train = -1 m/s (since it moves opposite direction to the yellow train, we will put negative to show the opposite direction)

To calculate the initial momentum of both trains, we will use the principle of conservation of momentum which

The sum of initial momentum = the sum of final momentum

Since the question only wants the sum of initial momentum,

(100)(8) + (200)(-1) = 600 m/s

8 0

2 years ago