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3 years ago

Explain how friction keeps a nail in place in a block of wood. If you try pull out the nail which way does friction act?

Physics

1 answer:

Bess [88]3 years ago

8 0

Answer:

Opposite to the direction that you are pulling

Explanation:

Static friction acts in the opposite direction to the acceleration.

Kinetic friction acts in the opposite direction to the velocity.

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What do you think happens to kinetic energy with potential energy being increased?

swat32

Answer:

If the kinetic energy increases, the potential energy decreases, and vice-versa.

Explanation:

The amount of change in kinetic energy is equal to the amount of change in potential energy.

8 0

2 years ago

2000, the Millennium Bridge, a new footbridge over the River Thames in London, England, was opened to the public. However, after

sweet [91]

Answer:

n = 1810

A = 25 mm

Explanation:

Given:

Lateral force amplitude, F = 25 N

Frequency, f = 1 Hz

mass of the bridge, m = 2000 kg/m

Span, L = 144 m

Amplitude of the oscillation, A = 75 mm = 0.075 m

time, t = 6T

now,

Amplitude as a function of time is given as:

$A(t)=A_oe^{\frac{-bt}{2m}}$

or amplitude for unforce oscillation

$\frac{A_o}{e}=A_oe^{\frac{-b(6T)}{2m}}$

$\frac{6bt}{2m}=1$

$b=\frac{m}{3T}$

Now, provided in the question Amplitude of the driven oscillation

$A=\frac{F_{max}}{\sqrt{(k-m\omega_d^2)+(b\omega_d^2)}}$

the value of the maximum amplitude is obtained $(k=m\omega_d^2)$

thus,

$A=\frac{F_{max}}{(b\omega_d}$

Now, for n people on the bridge

Fmax = nF

thus,

max amplitude

$0.075=\frac{nF}{((\frac{m}{3T})2\pi}$

n = 1810

hence, there were 1810 people on the bridge

b) $A=\frac{F_{max}}{(b\omega_d}$

since the effect of damping in the millenium bridge is 3 times

thus,

b=3b

therefore,

$A=\frac{F_{max}}{(3b\omega_d}$

$A=\frac{1}{(3}A_o$

$A=\frac{1}{(3}0.075$

A = 0.025 m = 25 mm

6 0

3 years ago

Which of the following is necessary for the greenhouse effect?

Mice21 [21]

It is the atmosphere

3 0

3 years ago

A particle with charge Q and mass M has instantaneous speed uy when it is at a position where the electric potential is V. At a

olga nikolaevna [1]

Answer:

Explanation:

Ke = 1/2 MV^2

4 0

3 years ago

What phases is shown in each of the diagrams above?

taurus [48]

Answer:
A. Interphase
B. Cytokinesis
C. Metaphase
D. Anaphase

Correct me if I was wrong :)

7 0

4 years ago