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3 years ago

1. What is heat?

Physics

2 answers:

andrew-mc [135]3 years ago

8 0

The following answers:
1. C
2. A

V125BC [204]3 years ago

7 0

1) <span> What is heat? the answer is B because heat is a form of energy</span>

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If you push a chair across the floor at a cibstant velocity how does the force of friction compare with the force you exert?

Roman55 [17]

-- "constant velocity"   ===> acceleration is 0 .

-- acceleration=0   ===>   forces are balanced

-- balanced forces   ===> (friction) + (force you exert) = 0

   (friction) = -(force you exert)

They have equal magnitude and opposite direction.

7 0

4 years ago

A 56-kg skater initially at rest throws a 5.0-kg medicine ball horizontally to the left. Suppose the ball is accelerated through

aniked [119]

Answer:

$a_2=24.5\ \text{m/s}^2$ towards right

$a_1=2.1875\ \text{m/s}^2$ towards left

Explanation:

$m_1$ = Mass of skater = 56 kg

$m_2$ = Mass of ball = 5 kg

v = Final velocity of ball = 7 m/s

u = Initial velocity of ball = 0

s = Distance the ball moved in the hand of the skater = 1 m

Moving left is considered and moving right is considered positive.

From kinematic equations of motion we have

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{7^2-0^2}{2\times 1}\\\Rightarrow a=24.5\ \text{m/s}^2$

So, the ball will move towards right with a magnitude of acceleration $a_2=24.5\ \text{m/s}^2$ .

The force on the ball will be

$F_2=m_2a_2\\\Rightarrow F_2=5\times 24.5\\\Rightarrow F_2=122.5\ \text{N}$

The force on the ball is $122.5\ \text{N}$

The reaction force on the skater will be equal to the force on the ball but will have opposite direction.

$-F_1=F_2\\\Rightarrow -m_1a_1=F_2\\\Rightarrow a_1=-\dfrac{122.5}{56}\\\Rightarrow a_1=-2.1875\ \text{m/s}^2$

So, the skater will move towards left with a magnitude of acceleration $2.1875\ \text{m/s}^2$

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3 years ago

NEED ANSWER FAST WILL GIVE BRAINLIEST ANSWER IF CORRECT.

Aleonysh [2.5K]

The answer would be that they are close to water hope this helps!

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A typical, neutrally charged atom has

Alexxx [7]

(d) option is right answer

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Defenition of takes place in body cells

swat32

Answer:

the nucleus-containing central part of a neuron exclusive of its axons and dendrites that is the major structural element of the gray matter of the brain and spinal cord, the ganglia, and the retina. — called also perikaryon, soma.

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4 years ago

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