PHYSICS HIGH SCHOOL

Siobhan wants to measure the mass of a bag of flour. What should she do?

Answers

Answer 1

Answer:

Answer:

Newton meter,

Mass-spring system

Explanation:

Most commonly available Laboratory equipment is Newton meter.

It utilizes the spring system to subtend the hooked mass.

The dial indicates the amount of force required for the mass-spring system to be in equilibrium.

After performing the above described experiment. He should note down the atleast 5 sets readings given by the newton meter.

Average those 5 readings. The use the average answer to determine the mass as follows:

$m = (F_(avg) )/(g)$

where g: is the gravitational constant 9.81 m /s^2

Answer 2

Answer: Hey there!
Awesome question=)

Siobhan can place it on a regular scale(0 gravity area), or she can use the "balance scale"

I hope this helps;)

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if a 1000 kg car is sent toward a cement wall with a speed of 14m/s and car stops in .08 seconds. What's the average force exerted on the car/

Answers

Answer:175000N

Explanation:f=m(v-u)/t

F=1000(14-0)/0.08

F=(1000×14)/0.08

F=14000/0.08

F=175000N

The basic skill of advancing and controlling the ball to your feet while running.

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Direct Free Kick
Pass
and Dribbling

A 0.5 kg ball is dropped from rest at a point 1.2m above the floor. The ball rebounds straight upward to a height of 0.7m. What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor.

Answers

Answer:

4.281 kgm/s upward

Explanation:

Impulse:This can be defined product of force and time. The S.I unit of impulse is Ns.

From Newton's second law of motion,

Impulse = Change in momentum.

I = mΔv....................... Equation 1.

Where m = mass of the ball, Δv = change in velocity of the ball

and Δv = v -u

Where u = velocity of the ball before it hit the floor, v = velocity of the ball after if hit the floor

I = m(v-u) -------------- Equation 2

But

the initial kinetic energy of the ball = potential energy at the initial height (1.2 m above)

1/2mu² = mgh₁

Where h₁ = initial height. or height of the ball before collision

making u the subject of the equation,

u = √(2gh₁)........................ Equation 3

Where h₁ = 1.2 m g = 9.81 m/s²

Substitute into equation 3

u = √(2×1.2×9.81)

u =√(23.544)

u = -4.852 m/s.

Note: u is negative because the ball was moving downward at the first instance.

Similarly,

v = √(2gh₂)............................. Equation 3

h₂ = height of the ball after collision

Given: h₂ = 0.7 m, g = 9.81 m/s²

Substitute into equation

v = √(2×9.81×0.7)

v = √13.734

v = 3.71 m/s.

Also given: m = 0.5 kg,

Substituting into equation 2

I = 0.5(3.71-(4.852)

I = 0.5(8.562)

I = 4.281 kgm/s. Upward.

Thus the impulse = 4.281 kgm/s upward

What is the minimum coating thickness (but not zero) that will minimize the reflection at the wavelength of 705 nm where solar cells are most efficient?

Answers

Answer:

d = 235 nm.

Explanation:

Let the layer be of glass. Refractive index of glass μ = 1.5. Let the required thickness be d.

For minimum reflection , that is destructive interference in thin films , the condition is

2μd = λ ( for first order)

d = 705 / 2 x 1.5 = 235 nm [ λ =705 nm ]

PLEASE HELP ASAP!!! CORRECT ANSWERS ONLY PLEASE!!!The shape of a projectile's trajectory is an ellipse.

True or false?

Answers

The statement is false. The shape of an object's trajectory can be a number of different shapes, not just an ellipse.

A(n) _____ wave best describes a wave whose direction of travel is perpendicular to the displacement of the medium.

Answers

A(n) Transverse wave best describes a wave whose direction of travel is perpendicular to the displacement of the medium.

Answer:

Explanation:

defenettly right

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