PHYSICS MIDDLE SCHOOL

Calculate the gravitational potential energy of a 10kg box on the top shelf of a closet, 2m above the floor

Answers

Answer 1

Answer:

Answer:

196 J

Explanation:

PE = mgh

PE = (10 kg) (9.8 m/s²) (2 m)

PE = 196 J

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Choose all the answers that apply. In pea plants, round seeds are dominant over wrinkled seeds. If two hybrids (Rr) are crossed: 50 percent will be Rr
25 percent will have round seeds
25 percent will have wrinkled seeds
1/4 will have round seeds
3/4 will have the same phenotype

I REALLY NEED HELP PLEASE

Answers

50 percent will be Rr

25 percent will have wrinkled seeds

The following information should be considered:

In the case when there is peaplants, roundseeds are dominant over wrinkled seeds.
So at the time of two hybrids are crossed so there should be 50% as Rr and 25% should be wrinkled seeds.

learn more: brainly.com/question/18269454?referrer=searchResults

Correct answers:

50 percent will be Rr
25 percent will have wrinkled seeds

| R | r
----------------
R | RR| Rr
---|------------
r | Rr | rr

What information does the atomic mass of an element provide? A. the sum of electrons and protons in an atom B. the difference between the number of protons and electrons C. the number of protons and neutrons in an atom D. the number of isotopes

Answers

C...

the atomic mass denotes the sum of the subatomic particles in a nucleus of an atom (neutron & proton).... the reason why the electron is not included is because it is very light and thus thought to be negligible.

I have an object that I want to know when it was made. I calculate that the object contains 0.12g of Iodine-131 but started with 60g. How old is my object?

Answers

Answer: 71.72 days

Explanation:

This problem can be solved using the Radioactive Half Life Formula:

$A=A_(o).2^{(-t)/(h)}$ (1)

Where:

$A=0.12 g$ is the final amount of Iodine-131

$A_(o)=60 g$ is the initial amount of Iodine-131

$t$ is the time elapsed

$h=8 days$ is the half life of Iodine-131

Knowing this, let's substitute the values and find $t$ from (1):

$0.12 g=(60 g)2^{(-t)/(8 days)}$ (2)

$(0.12 g)/(60g)=2^{(-t)/(8 days)}$ (3)

Applying natural logarithm in both sides:

$ln((0.12 g)/(60g))=ln(2^{(-t)/(8 days)})$ (4)

$-6.21=-(t)/(8 days)ln(2)$ (5)

Finding $t$ :

$t=71.72 days$

The SI units for measuring the velocity of the car: The SI units for measuring the acceleration of the car: The SI units for measuring force: The SI units for measuring mass:

Answers

Answer:

The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.

Explanation:

SI unit is the international system units.

We need to define the SI unit of velocity, acceleration, force and mass of the car

The SI unit of velocity is

$v = m/s$

The SI unit of acceleration is

$a = m/s^2$

The SI unit of force is

$F = N=kg-m/s^2$

The SI unit of mass is

$m =kg$

Hence, The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.

Velocity ... m/s (meters per second) and angle

Acceleration ... m/s^2 and angle

Force ... Newton (kg-m/s^2) and angle

Mass ... kilogram

La ce distanta de la suprafata Pamintului intensitatea cimpului sau gravidational este egala cu 1 N/kg ?Va rooogggg .. ofer 21 puncte !!!

Answers

Acceleration of gravity is proportional to 1/D² .
('D' is the distance from the Earth's center.)

We need (D / R)² = 9.8
('R' is the Earth's radius.)

D/R = √9.8 = 3.13

Distance from Earth's center = 3.13 R
Distance above Earth's surface = 2.13 R = about 13,570 km =====================================================

Accelerarea de gravitate este proporțională cu 1 / D².
('D este distanța de centrul Pământului.)

Avem nevoie de (D / R) ² = 9,8
('R' este raza Pământului.)

D / R = √9.8 = 3,13

Distanța de la centrul Pamantului = 3,13 R
Distanța de deasupra suprafetei Pamantului = 2.13 R = aproximativ 13,570 km

What is currently the most supported theory about the future of the universe A.)the universe could remain exactly as it is today
B.) the universe may continue to expand
C.) stars could burn out , causing the universe to become dark and cold
D.) gravity could pull galaxies back together causing a reverse of the Big Bang

Answers

Answer:

B.) the universe may continue to expand

Explanation:

The steady state theory which states that the universe was, is and will be the same, has been discredited by two physicists who found the leftover energy from the big bang.

If you are listening to FM radio, you might have heard some static noise while changing stations, that noise is from the leftover energy from the big bang. This energy is called the dark energy.

The dark energy tries to rip everything apart while gravity tries to hold everything together.

It was observed that the dark energy is stronger than gravity.

The distance between the galaxies is increasing. This proves that the dark energy successfully defeated the gravity and expanted two massive objects in the universe.

Because of this dark energy the universe will continue to expand.

Note: Dark energy is also increasing the distance between protons in atomic nucleus in every atom in our body too. Chilly right?

the answer is B! it would continue to expand.....just took the test XD

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The initial kinetic energy imparted to a 0.020 kg bullet is 1200 J. (a) Assuming it accelerated down a 1.00 m rifle barrel, estimate the average power delivered to it during the firing. (b) Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained.