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rosijanka [135]

3 years ago

10

When an inclined plane is used, A. the mechanical advantage increases as the height increases. B. a smaller force is exerted ove

r a longer distance. C. a negative mechanical advantage can result. D. a greater force is exerted over a shorter distance

1 answer:

lesantik [10]3 years ago

7 0

Choice-B says it all.

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What is the heat-loss rate through the slab if the ground temperature is 5 ∘C while the interior of the house is 25 ∘C?

Gala2k [10]

Complete question :

A 12 m x 15 m house is built on a 12-cm-thick concrete slab.

What is the heat-loss rate through the slab if the ground temperature is 5°C while the interior of the house is 25°C

Answer:

3kW

Explanation:

Given the following :

Dimension of house :

Length = 12m

Width = 15m

Thickness of concrete slab (t) = 12cm

t in metres :

100cm = 1m

12cm = (12/100)m

= 0.12m

Ground temperature (Tg) = 5°C

Interior temperature = (Th) = 25°C

Thermal conductivity of concrete (K) is approximately 1 Wm/k

Using the relation:

Q = KA * [ (Th - Tg) / d]

A = Length * width = (12 *15) = 180

Q = (1 * 180) * [(25°C - 5°C) / 0.12]

Q = 180 * (20/0.12)

Q = 180 * 16.6666

Q = 3,000W = 3kW

3 0

4 years ago

The blade of a windshield wiper moves through an angle of 180.0 degrees in 0.500 s. The tip of the blade moves on the arc of a c

sweet-ann [11.9K]

Answer:

Centripetal acceleration will be equal to $10.66m/sec^2$

Explanation:

We have given time taken to cover 180° is 0.5 sec

So time taken by 360° is equal to = 2×0.5 = 1 sec

Radius of the circle r = 0.520 m

So distance $d=2\pi r=2\times3.14\times 0.520=3.2656m$

So velocity $v=\frac{distance}{time}=\frac{.2656}{1}=3.2656m/sec$

We have to find the centripetal acceleration

Centripetal acceleration will be equal to $a_c=\frac{v^2}{r}=\frac{3.2656^2}{1}=10.66m/sec^2$

So centripetal acceleration will be equal to $10.66m/sec^2$

7 0

4 years ago

What characteristics would an Earth-like planet need to have to support life?

kirza4 [7]

Answer:

water, air, vegetation, and light. also a good temperature thats not too hot or too cold

Explanation:

8 0

4 years ago

Read 2 more answers

Calculate the work done by a person who exerts a force of 200.0 N in the horizontal direction on a box that moves 10.0 meters al

Westkost [7]

Answer:

the work done by a person is 1,732 J

Explanation:

The computation of the work done by a person is as follows;

The following information is given

Force = 200.N

Distance = 10.0 meters

Angle = 30 degrees

based on the above information

Work done is

$\overset{F}{\rightarrow}. \overset{D}{\rightarrow}\\\\fd cos \theta$

Work done is

= (200) (cos 30 degrees) (10.0 meters)

= 1,732 J

hence, the work done by a person is 1,732 J

The same is considered and relevant

7 0

3 years ago

An object is in circular motion how will the object behave if the centripetal force is removed

Monica [59]

If the force is removed, then there are no other forces acting on the object, the object will continue to move at constant velocity, meaning that it would move in a line tangent to the circular path.

8 0

3 years ago