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4 years ago

_____ can be reduced but it cannot be eliminated.

2 answers:

3 0

Heat can be reduced but it cannot be eliminated completely there is some amount if heat energy present even if it is absolute zero(-273degrees Celsius)

Grace [21]4 years ago

3 0

Answer:

I am pretty sure its friction

Explanation: Because it is the only thing stopping us freom sliding around the earth.

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Object A and object B are moving with the same momentum. Which of the following statements must be true?

nordsb [41]

The FIRST statement on the list is the definition of momentum, so that's the one that must be true.

5 0

3 years ago

The time lag between education of a muscle cell and the beginning of contraction is known as the ______

Alexus [3.1K]

I think it will be muscle contraction. Hope this helps! Mark brainly please!

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3 years ago

A plane on the ground will weigh:

kenny6666 [7]

On ground weight of plane will be measured as its actual weight which will be given as

$W = mg$

now when plane is in air its weight is measured as combined effect of earth gravitational force and buoyancy force both

so weight in air will be given as

$W_{air} = mg - F_b$

here since net effect due to air is opposite to the direction of weight so in air the plane weight will be measure less than its weight on ground.

so answer will be

A)more than a plane in the air

3 0

3 years ago

Read 2 more answers

A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.90 m/s2 . At 20.0s after blastoff, t

Brilliant_brown [7]

Answer:

A) 580m

B) 0 m/s

C) 9.8m/s^2

D) downward

E) 10.87s

F) 106.62 m/s

Explanation:

A) The distance traveled by the rocket is calculated by using the following expression:

$y=\frac{1}{2}at^2$

a: acceleration of the rocket = 2.90 m/s^2

t: time of the flight = 20.0 s

$y=\frac{1}{2}(2.90\frac{m}{s^2})(20.0s)^2=580m$

B) In the highest point the rocket has a velocity with magnitude zero v = 0m/s because there the rocket stops.

C) The engines of the rocket suddenly fails in the highest point. There, the acceleration of the rocket is due to the gravitational force, that is 9.8 m/s^2

D) The acceleration points downward

E) The time the rocket takes to return to the ground is given by:

$t=\sqrt{\frac{2y}{g}}=\sqrt{\frac{2(580m)}{9.8m/s^2}}=10.87s$