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scZoUnD [109]
3 years ago
14

Identify the parts of the wave below. Please help! I need it quite soon!

Physics
1 answer:
dimulka [17.4K]3 years ago
4 0
A. wavelength
<span>B. Amplitude
 The others I am not sure about

</span>
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How much total work is done by the force in lifting the elevator from 0.0 m to 9.0 m?
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The total work is

         (mass of the elevator, kg) x (9.8 m/s²) x (9.0 m)           Joules .
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Which formula can be used to find the magnitude of the resultant vector? R2 = Rx2 + Ry2 R = Rx + Ry R = Rx(cosθ) R = Rx(sinθ)
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R^2 = rx^2 + ry^2 !!!!!!!!!!
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A 49 kg bear slides, from rest, 11 m down a lodgepole pine tree, moving with a speed of 3.3 m/s just before hitting the ground.
hichkok12 [17]

Answer:

a) \Delta U_g=-5.3kJ

b) K=0.27kJ

c) F_f=0.45kN

Explanation:

the gravitational potential energy is given by:

U_g=m.g.h\\

\Delta U_g=m.g.h_f-m.g.h_i\\\Delta U_g=49kg*9.8m/s^2*(0m-11m)\\\Delta U_g=-5.3kJ

The kinetic energy is given by:

K=\frac{1}{2}m.v^2\\

the initial kinetic energy is zero because the motion started from rest, so:

K=\frac{1}{2}*49kg*(3.3m/s^2)^2\\K=0.27kJ

applying the conservation of energy theorem:

U_g-W_f=K_f\\W_f=-(\Delta K+\Delta U)\\W_F=5.3kJ-0.27kJ\\W_F=-5.0kJ

The work done by the friction force is given by:

W_f=F_f.h.cos(\theta)\\

the angle of the force is 180 degrees because it's against the movement:

F_f=\frac{W_f}{h.cos(\theta)}\\\\F_f=\frac{-5.0kJ}{11m.cos(180^o)}\\\\F_f=0.45kN

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Answer: I have no idea either i need help aswell

Explanation:

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Steel Usually forms a
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Permanent magnetism (of the steel)

make me brainliestt :))

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