PHYSICS HIGH SCHOOL

Which one of the following is not part of john daltons atomic theory ?a)all elements are composed of atoms
b) all atoms of the same element have the same mass
c)atoms contain subatomic particles
d) a compound contains atoms of more than one element

Answers

Answer 1
Answer: c) atoms contain subatomic particles.

John Dalton's atomic model was also known as a 'Billiard Ball Model' because he thought that all atoms were just simple spheres, and nothing complex inside.

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Why does the same side of the moon always face the earth?

Answers

Because the moon takes exactly precisely the same time to rotate once on its axis as it takes to revolve once in its orbit around the Earth.

work of 4 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (in newtons) that holds the spring stretched at the same distance (11 cm)

Answers

The work performed on the spring is

W = 1/2 k x²

so that

4 J = 1/2 k (0.11 m)²   ⇒   k ≈ 660 N/m

Then by Hooke's law, the force required to hold the spring in this position is

F = k x = (660 N/m) (0.11 m) ≈ 73 N

When a 58g tennis ball is served, it accelerates from rest to a constant speed of 36 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 35 cm. What is the magnitude of the net force acting on the ball?

Answers

We first calculate the acceleration on the ball using:
2as = v² - u²; u = 0 because ball is initially at rest
a = (36)²/(2 x  0.35)
a = 1850 m/s²
F = ma
F = 0.058 x 1850
= 107.3 Newtons

Scientists use different types of microscopes to observe objects that are not visible to the naked eye. A scientist is reviewing various samples of pond water to determine what species of microorganisms live in the pond. The scientist wishes to make drawings of the structure of each microorganism and study each one's method of movement. Which of the following microscopes would be best for the scientist to use?a.

transmission electron microscope

b.

scanning electron microscope

c.

compound light microscope

d.

dissecting microscope

Answers

A compound light microscope is the correct answer. Compound light microscopes provide a clear picture of many microorganisms, such as protozoans, and are used to view their structures and movements. Often, in the field of Microbiology, compound light microscopes are used for observing living microorganisms.

Answer;

-Compound light microscope

Explanation;

-A compound microscope is a microscope that uses multiple lenses to enlarge the image of a sample. It is commonly used for viewing samples at high magnification (40 - 1000x), which is achieved by the combined effect of two sets of lenses: the ocular lens and the objective lenses.

-Compound microscopes usually include exchangeable objective lenses with different magnifications (e.g 4x, 10x, 40x and 60x), mounted on a turret, to adjust the magnification. These microscopes also include a condenser lens and iris diaphragm, which are important for regulating how light hits the sample.

What kind of relationship between the independent and dependent variable does this graph illustrate? A. inverse proportion
B. linear
C. quadratic
D. direct proportion

Answers

Answer:

C. quadratic

Explanation:

Linear graphs are straight lines, and direct proportion graphs are lines that pass through the origin.

Inverse proportion graphs have vertical and horizontal asymptotes passing through the origin.

Quadratic graphs are parabolas.

The graph shown is a parabola, or quadratic.

What is meant by "elastic collisions?

Answers

When a moving car hits a parked car, causing the parked car to move, the type of collision is elastic collision. An elastic collision is when two bodies collide and separates after collision conserving the total kinetic energy before and after collision.
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