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3 years ago

A heat engine with a thermal efficiency of 45 percent rejects 500 kj/kg of heat. how much heat does it receive

Physics

1 answer:

adell [148]3 years ago

8 0

Alot as far as i know unless you need it in formal terms.

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How is the nitrogen cycle important to humans? HELP 18 mins

nikdorinn [45]

Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

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3 years ago

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A graph can be described as:

pantera1 [17]

D all of the above

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2 years ago

A racing car going a 20 m/s stops in a distance of 20 m.What is its acceleration?

aleksklad [387]

step by step

formular v^2 = u^2+2as

stop v = 0

0 = 400+2a(20)

-400=40a

a = -10 m/s^2

ans affect acceleration is 10 m/s^2

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3 years ago

A ball of mass m is attached to a string of length L. It is being swung in a vertical circle with enough speed so that the strin

forsale [732]

Answer:

$\frac{m}{r}(v_b^2-v_t^2)+2mg$

Explanation:

When the ball is at the bottom position of the vertical circle, the forces acting on the ball are:

- The tension in the string, $T_b$ , upward

- The weight of the ball, $mg$ , downward

The resultant of these forces must be equal to the centripetal force, which points upward as well (towards the center of the circle), so:

$T_b-mg=m\frac{v_b^2}{r}$ (1)

where $v_b$ is the speed of the ball at the bottom of the circle, r the radius of the circle, and m the mass of the ball.

When the ball is at the top position of the vertical circle, the weight still acts downward, however the tension in the string also acts downward, so the equation of the forces becomes:

$T_t+mg=m\frac{v_t^2}{r}$ (2)

where

$T_t$ is the tension in the string in the top position

$v_t$ is the speed of the ball in the top position

By subtracting eq.(2) from eq.(1), we find:

$T_b-mg-(T_t+mg)=m\frac{v_b^2}{r}-m\frac{v_t^2}{r}\\T_b-T_t=\frac{m}{r}(v_b^2-v_t^2)+2mg$

So, this is the difference in tension between the two positions.

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3 years ago

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In your own words, explain the scientific evidence that supports the continental drift theory. Please Help! Space and science.

Romashka-Z-Leto [24]

Answer:

The continental drift is a geological theory according to which the continents would move with respect to one another. It was introduced, in its modern version, in 1912 by Alfred Wegener, who was the first to present the evidence of the phenomenon and a coherent explanation of its causes in an organic formulation. In modern science the theory of continental drift is replaced by the more general theory of plate tectonics.

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2 years ago