3 years ago

Please help me, it's a simple equation

1 answer:

3 0

Because the elevator moves at a constant speed, it's in equilibrium and the net force acting on it is zero. Then the tension in the cable exactly equals the magnitude of the elevator's weight, which is

(3000 kg) (9.80 m/s²) = 29,400 N

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When the displacement in SHM is equal to 1/3 of the amplitude xm, what fraction of the total energy is (a) kinetic energy and (b

Nesterboy [21]

Answer:

Explanation:

Given

Displacement is $\frac{1}{3}$ of Amplitude

i.e. $x=\frac{A}{3}$ , where A is maximum amplitude

Potential Energy is given by

$U=\frac{1}{2}kx^2$

$U=\frac{1}{2}k(\frac{A}{3})^2$

$U=\frac{1}{18}kA^2$

Total Energy of SHM is given by

$T.E.=\frac{1}{2}kA^2$

Total Energy=kinetic Energy+Potential Energy

$K.E.=\frac{1}{2}kA^2 -\frac{1}{18}kA^2$

$K.E.=\frac{8}{18}kA^2$

Potential Energy is $\frac{1}{8}$ th of Total Energy

Kinetic Energy is $\frac{8}{9}$ of Total Energy

(c)Kinetic Energy is $0.5\times \frac{1}{2}kA^2$

$P.E.=\frac{1}{4}kA^2$

$\frac{1}{2}kx^2=\frac{1}{4}kA^2$

$x=\frac{A}{\sqrt{2}}$

7 0

4 years ago

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You and your friend are having a discussion about weight. He claims he weighs less on the 100th floor of a building that he does

balu736 [363]

No the acceleration of gravity on earth is still 9.8ms-2 unless he was on a different planet

7 0

4 years ago

This will have to do with that which statement describes seismic waves?

AURORKA [14]

Answer:

an elastic wave in the earth produced by an earthquake or other means

Explanation:

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3 years ago

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Which type of friction opposes motion?

Lady bird [3.3K]

Answer:

Friction does not oppose motion, it oppose relative motion.

Explanation:

static friction opposes relative motion

4 0

3 years ago

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While standing at the edge of the roof of a building, a man throws a stone upward with an initial speed of 6.63 m/s. The stone s

gogolik [260]

Answer:

Speed=28.1m/s(to 3s.f.) , Time=2.19s(to 3s.f.)

Explanation:

Time=Distance/Speed

=14.5/6.63

=2.19s(to 3s.f.)

Acceleration=Final Velocity(v)-Initial Velocity(u)/Time

9.81=v-6.63/2.19

v-6.63=21.5

v=28.1m/s

3 0

3 years ago