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3 years ago

Explain how all the organelles in a cell model work together to provide nutrition and energy for the cell.

1 answer:

6 0

These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. Eukaryotes also have a golgi apparatus that packages and distributes proteins.

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4. A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the

Alenkinab [10]

The net force on the sled is 300 N

Explanation:

First of all, we start by finding the acceleration of the bobsled, by using the suvat equation:

$v^2-u^2=2as$

where:

v = 6.0 m/s is the final velocity of the sled

u = 0 is the initial velocity

a is the acceleration

s = 4.5 m is the displacement of the sled

Solving for a, we find

$a=\frac{v^2-u^2}{2s}=\frac{6.0^2-0}{2(4.5)}=4 m/s^2$

Now we can find the net force on the sled by using Newton's second law:

F = ma

where

F is the net force

m = 75 kg is the mass of the sled

$a=4 m/s^2$ is the acceleration

Solving the equation, we find the net force:

$F=(75)(4)=300 N$

Learn more about acceleration and Newton laws here:

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#LearnwithBrainly

8 0

3 years ago

What factors affect the ability of a substance to transfer thermal energy to heat or be heated by it's surroundings?

xeze [42]

The prime factors that affect the ability of substances to transfer the thermal energy to heat are the temperature difference between the two objects, area of cross-section, time, and distance travelled by the thermal energy.

<u>Explanation: </u>

The process of heat conduction takes place through contact between two or more objects. But this conduction depends on multiple factors that are responsible for thermal conduction. They are-

Temperature Difference( $\Delta T$ ) - The two objects must have a temperature difference else there will be no thermal conduction between them. The more the difference in their temperatures, the more thermal energy flows from one object to the other.
Area of Cross-section (A) - Larger areas of contact provide as better medium of thermal conduction.
Time (t) - The more time we give for the thermal conduction, the more energy is transmitted from one system to the other.
Distance Travelled (l) - The longer the distance, lesser the conduction. Means, the distance should be minimized in order to achieve the optimum thermal conduction between two objects.

Consider metal pot and its handle, it is being boiled for 15 m. The molecules present near the source of heat, showing fast vibration and bounce off. It actually indicates the heats of substance. That’s why, handle remains hot as heat conduction takes place. It can be estimated by,

$Q=\frac{k A \Delta T t}{l}$

k - Thermal conductivity of the material, measured in J/s.m. $^{\circ} \mathrm{C}$

4 0

3 years ago

As a quality test of ball bearings, you drop bearings (small metal balls), with zero initial velocity, from a height of 1.94 m i

11Alexandr11 [23.1K]

Answer:

The average acceleration of the bearings is $0.77\times10^{3}\ m/s^2$

Explanation:

Given that,

Height = 1.94 m

Bounced height = 1.48 m

Time interval $t=14.86\times10^{-3}\ s$

Velocity of the ball bearing just before hitting the steel plate

We need to calculate the velocity

Using conservation of energy

$mgh=\dfrac{1}{2}mv^2$

Put the value into the formula

$9.8\times1.94=\dfrac{1}{2}\times v^2$

$v=\sqrt{2\times9.8\times1.94}$

$v=6.166\ m/s$

Negative as it is directed downwards

After bounce back,

We need to calculate the velocity

Using conservation of energy

$mgh=\dfrac{1}{2}mv^2'$

Put the value into the formula

$9.8\times1.48=\dfrac{1}{2}\times v^2'$

$v'=\sqrt{2\times9.8\times1.48}$

$v'=5.38\ m/s$

We need to calculate the average acceleration of the bearings while they are in contact with the plate

Using formula of acceleration

$a=\dfrac{v-v'}{t}$

Put the value into the formula

$a=\dfrac{5.38-(-6.166)}{14.86\times10^{-3}}$

$a=776.98\ m/s^2$

$a=0.77\times10^{3}\ m/s^2$

Hence,The average acceleration of the bearings is $0.77\times10^{3}\ m/s^2$

6 0

3 years ago

A car travels 60 km in 1 hour, 100 km in 2 hours, and then 40 km in 1 hour before reaching its destination. What was the car's a

Diano4ka-milaya [45]

Answer:c

Explanation:

3 0

3 years ago

A rock is kicked horizontally at a speed of 16 m/s from the edge of a cliff. The rock strikes the ground 65 m from the foot of t

Anestetic [448]

Answer:

First, let's solve the horizontal problem.

The horizontal velocity is 16m/s, and there is no forces in this axis, so the velocity is constant:

v(t) = 16m/s.

Now, we know that the rock hits the ground 65m from the foot of the cliff.

We can use the relation:

time = distance/velocity = 65m/16m/s = 4.06 seconds.

This is the time that the rock needs to hit the ground.

Now let's analyze the vertical problem.

The only force acting on the rock is the gravitational force, then we can write the acceleration as:

a(t) = -g

where g = 9.8m/s^2

For the velocity, we should integrate over time and get:

v(t) = -g*t + v0

where v0 is the initial velocity in this axis, but we do not have any, so v0 = 0.

v(t) = -g*t

Now, to get the position we should integrate again over time, and get:

p(t) = (-g/2)*t^2 + p0

where p0 is the initial vertical position, in this case is p0 = H.

p(t) = -(9.8/2 m/s^2)*t^2 + H

And we know that at t= 4.06 seconds, the rock hits the ground, then:

p(4.06s) = 0m = -(9.8/2 m/s^2)*(4.06s)^2 + H

= -80.77m + H

H = 80.77m

The height of the cliff is 80.77 meters.

6 0

4 years ago