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4 years ago

11

What does fitness means to you

2 answers:

Tasya [4]4 years ago

8 0

Answer:

Exercising, yoga

Explanation:

Phantasy [73]4 years ago

7 0

Exercising and staying fit

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Mass A (2.0 kg) is moving with an initial velocity of 15 m/s in the +x-direction, and it collides with mass B (5.0 kg), initiall

mamaluj [8]

Answer:

$\Delta K=-160.89\ J$

Explanation:

It is given that,

Mass of object A, $m_A = 2\ kg$

Initial speed of object A, $u_A=15\ m/s$

Mass of object B, $m_B = 5\ kg$

Initial speed of object A, $u_B=0$ (at rest)

Le V is the final speed when they lock and move with one common velocity. Using the conservation of momentum to find it.

$m_Au_A+m_Bu_B=(m_A+m_B)V$

$m_Au_A=(m_A+m_B)V$

$V=\dfrac{m_Au_A}{(m_A+m_B)}$

$V=\dfrac{2\times 15}{(2+5)}$

V = 4.28 m/s

Initial kinetic energy of the system is :

$K_i=\dfrac{1}{2}m_Au_A^2$

$K_i=\dfrac{1}{2}\times 2\times (15)^2$

$K_i=225\ J$

Final kinetic energy of the system is :

$K_f=\dfrac{1}{2}(m_A+m_B)V^2$

$K_f=\dfrac{1}{2}\times (2+5)\times (4.28)^2$

$K_f=225\ J$

$K_f=64.11\ J$

Let $\Delta K$ is the change in kinetic energy of the system after the collision. It is given by :

$\Delta K=K_f-K_i$

$\Delta K=64.11-225$

$\Delta K=-160.89\ J$

So, the change in kinetic energy of the system is 160.89 Joules.

4 0

3 years ago

A rock occupies a volume of 2cm3 and has a mass of 54 grams. find the density of this rock.

MaRussiya [10]

Density is Mass divided by Volume, or;
$D=\frac{M}{V}\\D=\frac{54g}{2cm^{3}}=27\frac{g}{cm^{3}}$
Your answer is 27 g/cm³.

5 0

3 years ago

To a stationary observer, a bus moves south with a speed of 12 m/s. A man

crimeas [40]

ANSWER

C 11.5 m/s

EXPLANATION

6 0

4 years ago

If you bake a cake in the oven in your kitchen, you can feel the warmth of the oven if you stand next to it. This is an example

Nitella [24]

I believe this is an example of transferred heat. Are there any multiple choice given?

6 0

4 years ago

Suppose you are standing on a bathroom scale when you are flying in a jet airplane. for a moment the scale reads less than your

IRINA_888 [86]

Answer:

Inertia

Explanation:

When the planes moves downward a speed, the weight of the person will decrease a bit due to the amount of g decreases for that particular instant. The person is now experiencing a less than actual weight called as apparent weight due to the upward superposition of inertia on the body as we can see in w = m g .

7 0

3 years ago