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4 years ago

What is the difference between a general and a specific tolerance, and how can you tell the difference on a drawing?

1 answer:

6 0

<span>During the reading of a blueprint, a general tolerance pertains to all dimensions that are not independently identified. All tolerances are +\- .030. General tolerances are mostly found in the blueprint’s set of information. Let’s say for example, a compact tolerance is required, then a specific tolerance is considered for specific areas of the blueprint. These kinds of tolerances are commonly found along the affected area.</span>

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While 75-kg Anthony roller skates at 3 m/s, 60-kg Sue jumps into his arms with a velocity of 5 m/s. How fast does the pair go to

anzhelika [568]

Apply conservation of linear momentum

$\\ \rm\Rrightarrow m1v1+m2v2=(m1+m2)V3$

$\\ \rm\Rrightarrow 75(3)+60(5)=(75+60)V3$

$\\ \rm\Rrightarrow 225+300=135v3$

$\\ \rm\Rrightarrow 525=135v3$

$\\ \rm\Rrightarrow V3=3.89m/s$

7 0

2 years ago

I NEED HELP BADLY

Marrrta [24]

Answer:

a) Andrea's initial momentum, 200 kg m/s

b) Andrea's final momentum, 0

c) Impulse, = - 200 Ns

d) The force that the seat belt exerts on Andrea, - 400 N

Explanation:

Given data,

The initial velocity of the car is, u = 40 m/s

The mass of Andrea, m = 50 kg

The time period of deceleration, a = 0.5 s

The final velocity of the car, v = 0

a) Andrea's initial momentum,

p = mu

= 50 x 40

= 200 kg m/s

b) Andrea's final momentum

P = mv

= 50 x 0

= 0 kg m/s

c) Impulse

I = mv - mu

= 0 - 200

= - 200 Ns

The negative sign indicated that the momentum is decreased.

d) The force that the seat belt exerts on Andrea

F = (mv - mu)t

= (0 - 200) / 0.5

= - 400 Ns

Hence,the force that the seat belt exerts on Andrea is, - 400 N

7 0

3 years ago

An engine absorbs 1.69 kJ from a hot reservoir at 277°C and expels 1.25 kJ to a cold reservoir at 27°C in each cycle.

Anna35 [415]

Answer

Given,

Energy absorbed, $Q_H = 1.69\ kJ$

Energy expels, $Q_C = 1.25\ kJ$

Temperature of cold reservoir, T = 27°C

a) Efficiency of engine

$\eta = \dfrac{Q_H - Q_C}{Q_H}\times 100$

$\eta = \dfrac{1.69 - 1.25}{1.69}\times 100$

$\eta =26.03 %$

b) Work done by the engine

$W = Q_H- Q_C$

$W =1.69 - 1.25$

$W = 0.44\ kJ$

c) Power output

t = 0.296 s

$P = \dfrac{W}{t}$

$P = \dfrac{0.44}{0.296}$

$P = 1.486\ kW$

8 0

3 years ago

What sort of trade-offs do you think engineers make between functionality, safety, and aesthetics when building a real bridge?

skelet666 [1.2K]

They make sure the bridge is functional and safe before the add the
<span>aesthetics</span>

5 0

3 years ago

Read 2 more answers

The horizon moon appears to shrink in size if it is viewed through a narrow tube that eliminates the perception of distance cues

Sonja [21]

Answer: (c) Context Effect

Explanation: Context Effect is an aspect of cognitive psychology which describes how environmental factors afects a person's perception of stimuli. It is known to occur at all scales at which words may be viewed. It is supported by constructive perception, the effect of a context perception is known to be part of a top-down design, the view of the moon through a narrow tube which has affected the perception of the viewer who now see the moon as shrinking in size is a context perception.

3 0

3 years ago