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3 years ago

What is dark energy?

1 answer:

4 0

Dark energy is a theoretical repulsive energy that causes the acceleration to the expansion of the universe. Among the choices, the nearest answer would be D. Dark energy can also be defined as a new form of energy, that is a dynamic field that fills up space but has an effect opposite to that of normal energy.

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A crane lift a cargo 10 m off the ground. If the the crane lifts the cargo box twice as high the potential energy will increase

katrin2010 [14]

Answer:

Two times

Explanation:

The crane lifts the cargo twice as high so the potential energy will increase twice the amount.

4 0

3 years ago

Read 2 more answers

3% of earth's water is?

Luda [366]

Is earth’s freshwater

Only about 3 percent of Earth’s water is fresh water.

8 0

3 years ago

Technician A says crimping solderless connections is the best method of splicing wires. Technician B says crimping should not be

algol13

Answer:

Technician b is correct.

Explanation:

Crimping cable allows a firm connection in mechanical terms and allows a low resistance path for the signal or the current flow, solder although it is better in terms of electrical conduction, can be impractical if the cable is subjected to excessive movement.

A crimped cable with excessive movement can also be easily broken at the ends, where it joins the part of the cable that is crimped, for this reason, a cable that is in excessive motion is recomended to be spliced by joining cable with cable .

In order to decide which metod is better for splicing cables its necessary to evaluate each situation separatly.

7 0

4 years ago

An airplane is traveling from North Africa to England. Which arrow correctly shows the direction gravity pulls the plane?

solniwko [45]

Given that,

The attached figure shows an airplane is traveling from North Africa to England.

To find,

The arrow that shows the direction gravity pulls the plane.

Solution,

The force of gravity always acts in the downward direction, The weight of an object is given by :

W = mg

Arrow 2 shows the direction of gravitational pull.

8 0

3 years ago

A motorboat heads due east at 16 m/s across a river that flows due south at 9.0 m/s. a.) What is the resultant velocity of the b

alukav5142 [94]

Answer:

a)V=18.35 m/s (South -East)

b) t =7.41 m/s

c)D= 66.70 m

Explanation:

Given that

Velocity of boat in east direction = 16 m/s

Velocity of river = 9 m/s

a)The resultant velocity V

$V=\sqrt{16^2+9^2}\ m/s$

V=18.35 m/s (South -East)

We know that

Distance = Velocity x time

Lets t time takes to cross the river

136 = 18.35 x t

t =7.41 m/s

The distance covered downstream

We know that

Distance = Velocity x time

t= 7.41 s

D= 7.41 x 9 m

D= 66.70 m

3 0

3 years ago