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3 years ago

Why is the mechanical advantage of a bottle opener always greater than 1?

1 answer:

6 0

For a lever, the mechanical advantage is the ratio of the lever arms. Since the lever arm of the opener is always greater than that of the output arm, the mechanical advantage is greater than 1.

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(b) A piece of wood of volume 0.6 m² floats in water. Find the volume

enot [183]

Answer:

Explanation:

Let the volume below water be v . Then

buoyant force = v d g where d is density of water , g is acceleration due to gravity

= v x 1000 x g

weight of wood piece = volume x density of wood x g

= .6 x 600 x g

for equilibrium while floating

buoyant force = weight

= v x 1000 x g = .6 x 600 x g

v = .36 m²

volume above water or volume exposed = .6 - .36

= .24 m²

When immersed completely ,

buoyant force = .6 x 1000 x 9.8

= 5880 N

weight of wood

= .6 x 600 x g

= 3528 N

buoyant force is more than the weight . In order to equalise them for floating with full volume in water

weight required = 5880 - 3528

= 2352 N.

6 0

3 years ago

Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same dista

qaws [65]

Answer:b

Explanation:

Given

mass of heavy object is 4m

mass of lighter object is m

A person pushes each block with same force F

According to Work Energy theorem Change in kinetic energy of object is equal to Work done by all the object

As launching velocity is same for both the object so heavier mass must possess greater kinetic energy . For same force heavier mass must be pushed 4 times farther than the light block .

$\Delta (K.E.)_H=\frac{1}{2}(4m)v^2$

$\Delta (K.E.)_L=\frac{1}{2}(m)v^2$

$\Delta K.E.=F\times d$

So the correct option is b

4 0

3 years ago

ASAP! What examples of resources can you give that can be classified as both material resources and energy resources? if u answe

natulia [17]

Wood because it is natural and we use it for furniture but we also burn it for energy.

4 0

4 years ago

Which object has the least thermal energy?

hichkok12 [17]

Answer:

2kg brick

Explanation:

2kg brick at 25 degrees.

5 0

2 years ago

Read 2 more answers

A 1400-kg rocket has a net propulsion force of 20 kN (kiloNewtons). Over a short time period, it uniformly speeds up from an ini

zubka84 [21]

Answer:

W = 8.92 10² kJ

Explanation:

For this exercise they give us the strength, we must calculate the distance traveled, for this we need the rocket acceleration let's use Newton's second law

F = m a

a = F / m

a = 20 103/1400

a = 14.29 m/s²

With kinematics we can find the distance traveled

$v_{f}$ ² = v₀² + 2 a x

x = ( $v_{f}$ ²-v₀²) / 2 a

x = (50² -35²) / 2 14.29

x = 1275 / 28.58

x = 44.61 m

Let's calculate the work

W = F.d

The bold is vector; as indicated by the force is in the direction of movement the scalar product is reduced to the ordinary product

W = F d

W = 20 10³ 44.61

W = 8.92 10⁵ J

W = 8.92 10² kJ

6 0

3 years ago