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3 years ago

I put +40 points!!!

Physics

2 answers:

ZanzabumX [31]3 years ago

6 0

oooooooooooooooo00000000p

Aleonysh [2.5K]3 years ago

5 0

Answer:We can solve this using the Law of Conservation of Momentum. If both marbles are in our system, the initial momentum should equal the final momentum.

The initial momentum can be solved for as so:

* + =

(0.06)(0.7) + (0.03)(0) = 0.042 [kg * m/s]

So if the system has an initial momentum of 0.042, it should have the same final momentum.

(0.06)(-0.2) + (0.03)() = 0.042

(0.03)() = 0.54

() = 18 [m/s]

Explanation:

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To completely describe the motion of an object, you need

notsponge [240]

Answer:

Explanation:

7 0

3 years ago

What mass of a material with density ρ is required to make a hollow spherical shell having inner radius r1 and outer radius r2?

krok68 [10]

Answer: $m=\frac {\rho}{\frac{4}{3} \pi( (r_2)^{3} - (r_1)^{3}) }$

It is given that:

Density of material =ρ

radius of inner spherical shell = $r_1$

radius of outer spherical shell= $r_2$

we know that the volume of sphere is $\frac{4}{3}\pi r^{3}$

Volume of the given spherical shell = $\frac{4}{3}\pi( (r_2)^{3}-(r_1)^{3})$

Then mass of the spherical shell can be calculate as:

Mass, m=density/ volume

$m=\frac {\rho}{\frac{4}{3} \pi ((r_2)^{3} - (r_1)^{3}) }$

6 0

3 years ago

Question 18/55 (2 p.)

Readme [11.4K]

Answer:

the correct answer is C v = 60 cm / s

Explanation:

The speed of a wave is related to the frequency and the wavelength

v = λ f

They indicate that the object performs 20 oscillations every second, this is the frequency

f = 20 Hz

the wavelength is the distance until the wave repeats, the distance between two consecutive peaks corresponds to the wavelength

λ = 3 cm = 0.03 m

let's calculate

v = 20 0.03

v = 0.6 m / s

v = 60 cm / s

the correct answer is C

6 0

3 years ago

Elsa has three metal blocks that look the same.

9966 [12]

Answer:

Aluminium is lightweight

Iron is magnetic

and one is not magnetic

4 0

3 years ago

A 48.0-kg astronaut is in space, far from any objects that would exert a significant gravitational force on him. He would like t

marusya05 [52]

Answer:

The astronaut is moving at a speed of 0.36m/s

Explanation:

Speed here corresponds to velocity

The astronaut's mass = 48kg

velocity of astronaut = ?

mass of socket = 0.72kg

velocity of socket = 5m/s

mass of the spanner = 0.8kg

velocity of spanner = 8m/s

change in time = 0.05 -0 = 0.05sec

mass of the mallet = 1.2kg

velocity of mallet = 6m/s

change in time = 9.9 -0 = 9.9sec

To find the astronaut velocity, we would calculate the total momentum which is the astronaut.

∑momentum (M) = ∑astronaut momentum

∑M = ∑astronaut M

∑astronaut M = M of socket + M of spanner + M of mallet

momentum = mass × velocity

(mass × velocity)of astronaut = (0.72×5) + (0.8×8) + (1.2×6)

48 × velocity of astronaut= 3.6 + 6.4 + 7.2

48 × velocity of astronaut= 17.2

velocity of astronaut = 17.2/48

velocity of astronaut = 0.36m/s

The astronaut is moving at a speed of 0.36m/s

5 0

3 years ago