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Elan Coil [88]
3 years ago
13

Two astronauts are floating together with zero speed in a gravity-free region of space. The mass of astronaut A is 110 kg and th

at of astronaut B is 74 kg. Astronaut A pushes B away, with B attaining a final speed of 0.4. The final recoil speed of astronaut A is:
Physics
1 answer:
Kobotan [32]3 years ago
4 0

Answer:

The recoil speed of Astronaut A is 0.26 m/s.            

Explanation:

Given that,

Mass of astronaut A, m_A=110\ kg

Mass of astronaut B, m_B=74\ kg

Astronaut A pushes B away, with B attaining a final speed of 0.4, v_B=0.4\ m/s

We need to find the recoil speed of astronaut A. The momentum remains conserved here. Using the law of conservation of linear momentum as :

m_Av_A=m_Bv_B\\\\v_A=\dfrac{m_Bv_B}{m_A}\\\\v_A=\dfrac{74\times 0.4}{110}\\\\v_A=0.26\ m/s

So, the recoil speed of Astronaut A is 0.26 m/s.                                

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Explanation:

4 0
3 years ago
Which events are associated with convergent boundaries? Check all that apply. formation of island chains creation of mid-ocean r
barxatty [35]

Answer:

- creation of mid-ocean ridges

-creation of new mountains

-formation of earthquakes

-formation of volcanoes

Convergent boundary plate tectonic involves collisions between oceanic and  continental plates. The thinner and less denser oceanic plate overriden by the thicker and more denser continental plate. The oceanic plate is forced down the mantle, this event is known as subduction. The magma present in the mantle causes melting of subduction plates. The magma enters inside these plates through pores. This magma plate becomes bouyant and moves upwards. The molten magma causes volcanic eruptions along with earthquakes. If the magma solidifies in the subduction zone it creates mid ocean ridges. The mountains are formed near the continents when the magma after volcanic eruption gets cooled and solidified.

4 0
3 years ago
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Danielle exerts a 14.0 N force to compress a spring by a distance of 8.00 cm. What is the spring constant of this spring
Lady_Fox [76]

Answer:

175 N/m

Explanation:

Given:

Force = F=  14.0 N

Distance = x = 8.00 cm = 0.08 m

To find:

spring constant

Solution:

spring constant is calculated by using Hooke's law:

k =  F/x

Putting the values in above formula:

k = 14.0 / 0.08

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4 0
3 years ago
When a metal sphere is dropped in to a tall cylinder containing liquid its acceleration is g/2 (gravity over 2). Shaow that : de
Alekssandra [29.7K]

Answer:

Fm is the net force down on the metal in air

Fm / 2 is the net force down on the metal in liquid

Fl is the buoyant force on the metal due to liquid

Fm - Fl = Fm / 2      equating upward and downward forces

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The specific gravity of the metal is twice that of the liquid

Note: F = M g = ρ V g     since ρ = M / V

4 0
2 years ago
Lillie is running. She increases her initial speed of 30 km/h to 40 km/h so she can win the race. If she takes 0.05 hours to com
Rudiy27

Answer:

200 km/h²

Explanation:

<em>Use the formula:</em>

acceleration = (final velocity - initial velocity) ÷ time taken

final velocity = 40 km/h

initial velocity = 30 km/h

time taken = 0.05 hours

<em>Substitute (plug in) the values into the equation:</em>

acceleration = (40 - 30) ÷ 0.05

acceleration = 10 ÷ 0.05

acceleration = 200 km/h²

7 0
3 years ago
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