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Murljashka [212]
2 years ago
10

Can someone help me please? I’ve been trying to solve these questions all day.

Physics
1 answer:
qwelly [4]2 years ago
4 0

#16

If we put a resistor in circuit it will slow the speed of current

Let's check ohms law

\\ \rm\Rrightarrow \dfrac{V}{I}=R

  • So if resistance is more current is less

#17

Again use ohms law

\\ \rm\Rrightarrow V=IR

\\ \rm\Rrightarrow V\propto I

  • Voltage must be increased
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The position of a 55 g oscillating mass is given by x(t)=(2.0cm)cos(10t), where t is in seconds. determine the velocity at t=0.4
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When the displacement in SHM is equal to 1/4 of the amplitude xm, what fraction of the total energy is (a) kinetic energy and (b
Anna71 [15]

Answer:

\frac{KE}{TE} = \frac{15}{16}

b)

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Explanation:

Let the amplitude of SHM is given as A

so the total energy of SHM is given as

E = \frac{1}{2}kA^2

now we know that

a)

kinetic energy is given as

KE = \frac{1}{2}k(A^2 - x^2)

here

x = \frac{A}{4}

so now we have

KE = \frac{1}{2}k(A^2 - \frac{A^2}{16})

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b)

Potential energy is given as

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

so we have

U = \frac{1}{32}kA^2

so fraction of energy is given as

\frac{U}{TE} = \frac{1}{16}

7 0
3 years ago
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