Answer:
let the speed of Allegra be x mph, then speed of Elliana is x+4 mph,
time to cover distance for Eliana is 2 hours, time to cover distance for Allegrais 2.5 hours,
since they both cover the same distance you have this,
distance (of Eliana) = distance (of Allegrais ),
distance=speed x time, so we have
speed (of Eliana) x time (of Eliana) = speed (of Allegra) x time (of Allegra),
2(x+4)=2.5x,
solve for x, then substitute back for speeds for Eliana and Allegra,
Eliana's speed = 16 + 4 = 20.
Allegra's speed = 16
The quantity can be work or kinetic energy or potential energy. Work is same as the energy.
Work done can be described as energy transferred from and object when a force is applied along a displacement. That is work done is the product of force in the direction of the displacement and the magnitude of the displacement.
Mathematically it can be represented as,
W = F x d
where,
W ⇒ work done
F ⇒ force acting along the displacement
d ⇒ magnitude of displacement
We know,
force = mass x acceleration
∴ the unit of force is kgms⁻²
The unit of work done will be kgms⁻² x m
That is kgm²s⁻²
where m is the unit of displacement that is meter (m)
Hence kgm²s⁻² is the unit for work or energy
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Missing figure: find it in attachment.
Answer:
Force D
Explanation:
In order to answer the question, let's keep in mind that the force of gravity on an object on Earth is the attractive force exerted by the Earth on the object; its direction is always downward (towards the Earth's centre), and its magnitude is given by
F = mg
where m is the mass of the object and g is the acceleration of gravity.
It follows immediately that in the figure, the force of gravity is the only force acting downward: therefore, force D.
The other forces are called:
Force A: thrust (it is the forward force generated by the engines)
Force B: lift (it is the upward produced by the aerodynamics of the wings)
Force C: air resistance (it is the backward force due to the friction between the air and the surface of the plane)
Answer:
82
Explanation:
According to law of reflection, the angle of incidence = angle of reflection
<span>One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what is the maximum value...</span>
