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3 years ago

The force that one surface exerts on another when the two rub against each other is called

1 answer:

7 0

1. Friction (Example: when you rub your hands together and you start to feel heat.)

2. Attract each other. (Example: Every object has a gravitational pull of some sort. The larger the object, the stronger the gravitational pull. This is why the sun is able to keep all eight planets in orbit around it.)

3. Hope this helped :)

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In deserts the temperatures can reach extreme values in deep of summer and winter. A steel bridge is being constructed and it is

ryzh [129]

Answer:

The length of the bridge during the hottest part of summer is $L_s = 1235.925 m$

Explanation:

From the question we are told that

The length of the steel bridge is $L = 1234.567m$

The temperature for this length is $T_1 = 233.15K$

The temperature at summer $T_2 = + 140.0F = \frac{140 - 32}{180} *100 + 273= 333 K$

The coefficient of linear expansion is $\alpha = 11.0123*10^{-6} K^{-1}$

Generally the change in length of the steel bridge is mathematically represented as

$\Delta L = \alpha L \Delta T$

Substituting value

$\Delta L = 11.0123*10^{-6} * 1234.567 (333-233.15)$

$\Delta L = 1.3575 \ m$

The length of the bridge in summer is mathematically evaluated as

$L_s = L + \Delta L$

Substituting values

$L_s = 1234.567 + 1.3575$

$L_s = 1235.925 m$

3 0

3 years ago

A 5.0kg toolbox is raised from the ground by a rope. If the upward acceleration of the bucket is 2.5 m/s^2, find the force exert

swat32

Answer:

62 N

Explanation:

Sum of the forces on the toolbox:

∑F = ma

T − mg = ma

T = mg + ma

T = m (g + a)

T = (5.0 kg) (9.8 m/s² + 2.5 m/s²)

T = 61.5 N

Rounded to two significant figures, the force exerted by the rope is 62 N.

8 0

3 years ago

Write one advantage of MKS system over CGS system.

Temka [501]

More convenient
More commonly used

7 0

3 years ago

When a cold front passes your location, the temperature drops rapidly. What happens to the air density?

densk [106]

It either increases or it decreases

3 0

3 years ago

Read 2 more answers

A single output device has failed while the remainder of the PLC system is functioning normally The indicator light on the outpu

Dmitry_Shevchenko [17]

Answer:

check the point where the output device's field wiring is connected to the output rack. ( C )

Explanation:

Given that an indicator light on the output module is indicating that a signal has been sent to the output point where the failed single output device is connected , the best line of action to properly indicate the output device that has filed in the PLC system, is to check the point where the output device's field wiring is connected to the output rack in the PLC system.

A PLC system is a computer control system ( especially Industrial ) that helps in the monitoring the states of input and output devices in an industry.

8 0

3 years ago