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3 years ago

A ball is thrown horizontally from a 20-m-high building with a speed of 5.0m/s

1 answer:

3 0

1) Horizontal velocity, Vx

Vx is constant and equal to 5.0 m/s

The graph Vx(t) = 5.0 m/s is a horizontal line (parallel to the horizontal t-axis). that intercepts the vertical-axis at 5.0 and runs from t = 0 to t = 2.

2) Vertical velocity, Vy

Vy = gt = 10t

d = at^2 / 2 => tmax = √(2d / a) = √(2*20m/10m/s^2) = 2 s

Graph Vy is an inclined line with slope 10 m/s^2, that runs from t =0 to t = 2 s, and passes through the points (0,0), (1,10), and (2,20).

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Neurons conduct electrical signals along their axons in one direction. what structure do some neurons have that increases conduc

irina1246 [14]

The myelin sheath is the structure some neurons have that increases conduction speed.

<h3>What is a neuron?</h3>

Information is transmitted via neurons. They communicate between various brain regions and between the brain and the rest of the nervous system through electrical impulses and chemical signals.

As we know,

An insulating layer of fatty tissue called the myelin sheath surrounds the axon of a neuron and speeds up the electrical signal transmission.

Thus, the myelin sheath is the structure some neurons have that increases conduction speed.

Learn more about the neuron here:

brainly.com/question/24217914

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1 year ago

A 2.0 Kg box is being pulled up a ramp with a force of 25.0 Newtons. The ramp has an incline of 30 degrees. If the coefficient o

nydimaria [60]

Answer:

The acceleration of the block is 1.21 m/s².

Explanation:

Given that,

Mass = 2.0 kg

Force = 25.0 n

Angle = 30°

Coefficient of friction = 0.752

We need to calculate the acceleration of the block

Using balance equation

$F-(mg\sin\theta+\mu mg\cos\theta)=ma$

Put the value into the formula

$25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)=2.0a$

$a=\dfrac{25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)}{2.0}$

$a=1.21\ m/s^{2}$

Hence, The acceleration of the block is 1.21 m/s².

5 0

3 years ago

What is the difference between primary cells and secondary cells?

TiliK225 [7]

Answer:

The major difference between a primary cell and the secondary cell is that primary cells are the ones that cannot be charged but secondary cells are the ones that are rechargeable

Explanation:

3 0

3 years ago

Read 2 more answers

On another planet, the isotopes of titanium have the given natural abundances. Isotope Abundance Mass (u) 46Ti 77.600% 45.95263

allsm [11]

Answer: Average atomic mass of titanium on that planet is 46.52

Explanation:

Mass of isotope Ti-46 = 45.95263

% abundance of isotope Ti-46 = 77.600 % = $\frac{77.600}{100}=0.776$

Mass of isotope Ti- 48= 47.94795

% abundance of isotope Ti-48 = 16.100%= $\frac{16.100}{100}=0.161$

Mass of isotope Ti- 50 = 49.94479

% abundance of isotope Ti-50 = 6.300%= $\frac{6.300}{100}=0.063$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$Z=\sum[(45.95263 \times 0.776)+(47.94795 \times 0.161)+(49.94479\times 0.063)$

$Z=46.52$

Average atomic mass of titanium on that planet is 46.52

8 0

3 years ago

When a sound source is moving away from an observer, the observer will hear a lower pitch. This is due to

Art [367]

a decrease in the frequency of the sound wave.

Explanation:

When a sound source is moving away from an observer, the observer will hear a lower pitch due to a decrease in the frequency of the sound wave. This is known as the Doppler's effect.

As the sound source moves closer to the observer, they hear a higher pitch in the reverse process.
A sound wave transmits vibrational energy from the source to the hearer.
A sound wave has frequency, amplitude, velocity and wavelength just like other wave types.
The frequency of a wave is the number of waves that passes through a point at a time.
This is related to the the wavelength of a wave.
Waves of a high frequency are known to have short wavelengths and vice versa.
To hear a low pitch, the source moves away and the wavelength between successive crests and troughs on a wave increases considerably.

Learn more:

Sound waves brainly.com/question/2845448

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6 0

4 years ago

Read 2 more answers