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noname [10]
3 years ago
5

Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is mo

ving upward with increasing speed, your weight will be __________.a. greater than your normal weight at restb. equal to your normal weight at restc. less than your normal weight at rest
Physics
1 answer:
butalik [34]3 years ago
8 0

Answer:

Explanation:

As the elevator starts moving up with an acceleration, so the weight becomes

W - mg = ma

W = m (g + a)

Thus, the weight of the body is greater than the normal weight at rest.

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A copper wire is 1.6 m long and its diameter is 1.1 mm. If the wire hangs vertically, how much weight (in N) must be added to it
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Answer:

Weight required = 194.51 N

Explanation:

The elongation is given by

            \Delta L=\frac{PL}{AE}

Length , L= 1.6 m

Diameter, d = 1.1 mm

Area

   A=\frac{\pi d^2}{4}=\frac{\pi \times (1.1\times 10^{-3})^2}{4}=9.50\times 10^{-7}m^2

Change in length, ΔL = 2.8 mm = 0.0028 m

Young's modulus of copper, E = 117 GPa = 117 x 10⁹ Pa

Substituting,

      \Delta L=\frac{PL}{AE}\\\\0.0028=\frac{P\times 1.6}{9.50\times 10^{-7}\times 117\times 10^9}\\\\P=194.51N

Weight required = 194.51 N

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The 20 g bullet is traveling at 400 m/s when it becomes embedded in the 2 -kg stationary block. Determine the distance the block
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Answer:

The block+bullet system moves 4 m before being stopped by the frictional force.

Explanation:

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According to Newton's second law of motion

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Momentum before collision = (0.02×400) + 0 (stationary block)

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Momentum after collision = (2+0.02)v

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According to the work-energy theorem,

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Kinetic energy = (1/2)(2.02)(3.96²) = 15.84 J

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