The very strong source of radio waves at the center of our galaxy is called.

A rock is thrown upwards and has a max altitude of 40 m. What was its initial velocity?

Natali [406]

Recall the formula,

${v_f}^2-{v_i}^2=2a\Delta x$

where $v_i$ and $v_f$ are the rock's initial and final velocities, respectively; $a$ is its acceleration; and $\Delta x$ is the displacement it undergoes.

At any point during its motion, the rock is subject to gravity, so $a=-g$ , where $g=9.80\frac{\rm m}{\mathrm s^2}$ . At its maximum height, the rock has zero vertical velocity, and if we take its starting height to be the origin, we have $\Delta x=x_{\rm max}$ .

So,

$0^2-{v_i}^2=-2gx_{\rm max}\implies-{v_i}^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)(40\,\mathrm m\implies\boxed{v_i=28\dfrac{\rm m}{\rm s}}$

5 0

3 years ago

Arrange the steps of energy production in the correct order.

Ulleksa [173]

Here are the correct steps involved in energy production:

<span>Step 1 - Consumption of food
Step 2 - breakdown of starch into glucose
Step 3 - absorption of glucose molecules
</span>Step 4 -cellular respiration in mitochondria<span>
Step 5 - creation of ATP

ATP is the end-product of aerobic respiration and this occurs in living organisms as soon as they have begun metabolizing the food that they have consumed.</span>

8 0

4 years ago

Read 2 more answers

A pendulum has 330 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o

Naddika [18.5K]

The pendulum has a kinetic energy of 330 J at the bottom of its swing.

when a pendulum oscillates, the energy at its highest point is wholly potential, since it is momentarily at rest at the highest point. The pendulum experiences acceleration which is directed towards the mean position, as a result of which its speed increases. It has maximum speed at the point which is at the bottom of its swing.

As the pendulum swings from the highest to the lowest point, the potential energy at the highest point is converted into kinetic energy.

If air resistance can be neglected, one can apply the law of conservation of energy, which states that the total energy of a system remains constant.

In this case, the potential energy of 330 J at the highest point would be equal to the kinetic energy at the bottom point.

Therefore, the kinetic energy at the bottom of its swing will be 330 J.

6 0

3 years ago

While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find th

Dovator [93]

Answer:

Explanation:

From the given information:

radius = 15 m

Time T = 23 s

a) Speed (v) = $\dfrac{2 \pi r}{T}$

$v = \dfrac{2\times \pi \times 15}{23}$

v = 4.10 m/s

b) The magnitude of the acceleration is:

$a = \dfrac{v^2}{r} \\ \\ a = \dfrac{(4.10)^2}{15}$

a = 1.12 m/s²

c) True weight = mg

Apparent weight = normal force

From the top;

the normal force = upward direction,

weight is downward as well as the acceleration.

true weight - normal force = ma

apparent weight =mg - ma

$\dfrac{apparent \ weight}{true \ weight} = \dfrac{(mg - ma)}{(mg)}$

$=1- \dfrac{1.12}{9.8}$

= 0.886 m/s²

d)

From the bottom;

acceleration is upward, so:

apparent weight - true weight = ma

apparent weight = true weight + ma

$\dfrac{apparent \ weight }{true \ weight} =\dfrac{ mg + ma}{mg}$

$\dfrac{apparent \ weight }{true \ weight} =1+ \dfrac{a}{g} \\ \\ = 1 + \dfrac{1.12}{9.8}$

$= 1 + \dfrac{1.12}{9.8} \\ \\$

= 1.114 m/s²

6 0

3 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