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4 years ago

What sort evidence must be gathered to support the idea that all living things are composed of cells

Physics

2 answers:

scZoUnD [109]4 years ago

8 0

Answer:

To support the idea that all living things are composed of cells samples of many kinds of living things should be examined under a microscope to identify the presence of cells.

Explanation:

Cell theory states that all living beings are composed of cells. To prove this a thorough examination of a number of living beings under a powerful microscope is needed. Parts of all living things when observed under the microscope are found to be made up of smaller units called cells.

This examination helps to identify differences between plant cells and animal cells. It also gives an idea of the existence of unicellular organisms.

DedPeter [7]4 years ago

6 0

Answer: To support the idea that all living things are composed of cells samples of many kinds of living things should be examined under a microscope to identify the presence of cells.

Explanation:

Cell theory states that all living beings are composed of cells. To prove this a thorough examination of a number of living beings under a powerful microscope is needed. Parts of all living things when observed under the microscope are found to be made up of smaller units called cells.

This examination helps to identify differences between plant cells and animal cells. It also gives an idea of the existence of unicellular organisms.

Explanation:

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In the figure, a weightlifter's barbell consists of two identical small but dense spherical weights, each of mass 50 kg. These w

kondaur [170]

The moment of inertia is $24.8 kg m^2$

Explanation:

The total moment of inertia of the system is the sum of the moment of inertia of the rod + the moment of inertia of the two balls.

The moment of inertia of the rod about its centre is given by

$I_r = \frac{1}{12}ML^2$

where

M = 24 kg is the mass of the rod

L = 0.96 m is the length of the rod

Substituting,

$I_r = \frac{1}{12}(24)(0.96)^2=1.84 kg m^2$

The moment of inertia of one ball is given by

$I_b = mr^2$

where

m = 50 kg is the mass of the ball

$r=\frac{L}{2}=\frac{0.96}{2}=0.48 m$ is the distance of each ball from the axis of rotation

So we have

$I_b = (50)(0.48)^2=11.5 kg m^2$

Therefore, the total moment of inertia of the system is

$I=I_r + 2I_b = 1.84+ 2(11.5)=24.8 kg m^2$

Learn more about inertia:

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6 0

3 years ago

A bullet of 5 gm is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 m/s,

Andreyy89

Answer:

-450 m/s

Explanation:

Momentum is conserved.

p₀ = p

0 = (1.5 kg) (1.5 m/s) + (0.005 kg) v

v = -450 m/s

6 0

3 years ago

Moving the probe 1 cm towards the non-grounded electrode changes the value the potential from about 0.90 V to about 1.2 V. Expla

svp [43]

Answer:

-30 N/C

Explanation:

Since the potential changes from 0.90 V to 1.2 V when I move the probe 1 cm closer to the non-grounded electrode, the electric field is the gradient between the two points is given by E = -ΔV/Δx where ΔV = change in electric potential and Δx = distance of potential change = 1 cm = 0.01 m

Now ΔV = final potential - initial potential = 1.2 V - 0.90 V = 0.30 V

Since E = -ΔV/Δx

substituting the values of the variables into the equation, we have

E = -ΔV/Δx

E = -0.30 V/0.01 m

E = -30 V/m

Since 1 V/m = 1 N/C.

E = -30 N/C

So, the average electric field is -30 N/C

6 0

3 years ago

The air that flows over the top part of an airplane's wing moves faster than the air that flows across the bottom. This faster m

kaheart [24]

As an airplane moves through the air, its wings cause changes in the speed and pressure of the air moving past them. These changes result in the upward force called lift.

The Bernoulli principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in the pressure exerted by the fluid.

A wing is shaped and tilted so the air moving over it moves faster than the air moving under it. As air speeds up, its pressure goes down. So the faster-moving air above exerts less pressure on the wing than the slower-moving air below. The result is an upward push on the wing—lift!

4 0

3 years ago

Black holes must have a mass three or more times the mass of _____.

tia_tia [17]

The answer is d. the sun

7 0

4 years ago

Read 2 more answers