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Anni [7]
3 years ago
6

WILL GIVE BRAINLIEST

Physics
1 answer:
Andrew [12]3 years ago
6 0

Answer:

28 N

Explanation:

According to Newton's second law of motion

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

in another form,

Force = mass * acceleration

assuming mass is a constant since considering the same object , we can say

Force ∝ acceleration

\frac{F_1}{F_2} =\frac{a_1}{a_2}\\ \\\frac{63}{F_2} =\frac{9}{4} \\F_2=28 N

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A lamp is rated for 240v,2.5A.what is the cost of using the lamp for 3hrs if 1kWh of electricity cost #12​
marshall27 [118]

Answer:

≈ 22¢

Explanation:

240 / 1000 = 0.240 kV

0.240 kV(2.5 A)(3 hr) = 1.8 kW•hr

1.8 kW•hr($0.12/kW•hr) = $0.216

6 0
3 years ago
an astronaut on an eva has wandered dangerously far away from the shuttle. she has also exhausted all the fuel in her jet pack.
V125BC [204]

The conservation of the momentum allows to find the result of how the astronaut can return to the spacecraft is:

  • Throwing the thruster away from the ship.

The momentum is defined as the product of the mass and the velocity of the body, for isolated systems the momentum  is conserved. If we define the system as consisting of the astronaut and the evo propellant, this system is isolated and the internal forces become zero. Let's find the moment in two moments.

Initial instant. Astronaut and thrust together.

        p₀ = 0

Final moment. The astronaut now the thruster in the opposite direction of the ship.

       m_f = m v + M v '

where m is propellant mass and M the astronaut mass.

As the moment is preserved.

       0 = m v + M v ’

      v ’= - \frac{m}{M} \ v  

We can see that the astronaut's speed is in the opposite direction to the propeller, that is, in the direction of the ship.

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In conclusion, using the conservation of the momentun we can find the result of how the astronaut can return to the ship is:

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Learn more here:  brainly.com/question/14798485

5 0
2 years ago
Please help help pls :::
kramer

Answer:

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6 0
3 years ago
A projectile travels above level ground. The initial vertical component of its velocity is 0.90 m/s and the initial horizontal c
sladkih [1.3K]
<span>at maximum height the final velocity will be 0 
using v=u+at and resolving vertically we get 
v=0.6+(-9.81)t 
v=0.6-9.81t 
0=0.6-9.81t 
9.81t=0.6 
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Now we need to resolve horizontally to find the horizontal distance 
using s=ut+1/2at^2 
However we now need the total time taken for the projectile travel and return to the ground. We can assume the time taken for the projectile to reach its maximum height and return to the ground is the same therefore 
the total time is 2 x 0.061=0.122seconds. They'll be now horizontal acceleration in this case scenario therefore 

Hence s=ut+1/2at^2 
since a=0 
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</span>
5 0
3 years ago
What is one way to model gravity and magnetism
Oxana [17]

Answer:

Gravity and magnetism are not the same thing. In fact, they are completely separate forces. Gravity is a force that acts between any two objects with mass. ... Magnetism can either pull the two objects together or push them apart, depending on which way the magnets point.

Explanation:

6 0
3 years ago
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