PHYSICS
MIDDLE SCHOOL

Answer:

The mass number is the total number of protons and neutrons within an atom and since we know that the unknown element has 6 neutrons, we can simply subtract the number of neutrons from the mass number to get the number of protons.

17 - 6 = 11

There are 11 protons in this unknown element.

Extra:

The number of protons (+) and electrons (-) are equal in a neutral atom so since you know that there are 11 protons you also know that there are 11 electrons. On the periodic table, the element with 11 electrons is Na or Sodium.

Hope this helps! :)

MIDDLE SCHOOL

What’s the mass of an object that weighs 32 newton’s

Answer:

m

≈

3.878

Kg

Explanation:

By Newton's second law,

F = m a

So, W = m g

m = W /g

m=32/ 8.25 Kg or 3.878 Kg (approx)

HIGH SCHOOL

An object with mass 3.5 kg is attached to a spring with spring stiffness constant k = 270 N/m and is executing simple harmonic motion. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s.(a) Calculate the amplitude of the motion._____ m(b) Calculate the maximum velocity attained by the object. [Hint: Use conservation of energy.]______ m/s

Answer:

Part a)

A = 0.066 m

Part b)

maximum speed = 0.58 m/s

Explanation:

As we know that angular frequency of spring block system is given as

here we know

m = 3.5 kg

k = 270 N/m

now we have

Part a)

Speed of SHM at distance x = 0.020 m from its equilibrium position is given as

Part b)

Maximum speed of SHM at its mean position is given as

MIDDLE SCHOOL

A “blank” is a tool that can be used to measure the size of a force??

The correct answer would be [ a spring scale. ]

I hope this helps!!!

I hope this helps!!!

COLLEGE

Kinetic energy is greatest when a roller coaster 1) is at the top of a hill.

2) is at the bottom of a hill.

3) has not yet started moving.

4) has just left the bottom of a hill.

Please provide an explanation. Thank you!

Hey Dave... you need to learn and I want you to improve I believe it to be at the bottom of the hill. Please read your siht homie

HIGH SCHOOL

One side of the roof of a building slopes up at 32.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child. The rock slides straight up the incline with an initial speed of 15.0 m/s. The coefficient of kinetic friction between the rock and the roof is 0.355. The rock slides 10.0 m up the roof to its peak. It crosses the ridge and goes into free fall, following a parabolic trajectory above the far side of the roof, with negligible air resistance. Determine the maximum height the rock reaches above the point where it was kicked.

Answer:

Explanation:

When rock is moving up along the inclined plane then the deceleration of the rock is given as

now we have

so final speed at the top of the ramp is given as

now at this point the vertical component of the velocity is given as

Now maximum height from the ground is given as

MIDDLE SCHOOL

Can any one explain physics

Physics is a type of science, like life science.

Physics is one of the main components of science like it’s all about space, energy n stuff

MIDDLE SCHOOL

A team of cross-country runners is training for a meet. The table shows the distance run and the overall time so far for each team member. Name Distance (miles) Time (hours) Mallory 12 2 Justine 5 1 Henry 6 2 Adya 5 Lily 2 Bert 9 The relationship between time and distance is not proportional across all runners. Only two runners ran at the same rate (have a proportional relationship of time and distance). Which two runners are they? A. Mallory and Justine B. Henry and Bert C. Adya and Lily D. Mallory and Bert E. Justine and Henry Reset Next

Answer:

d. 2

Explanation:

because Mallory cant have one of the numbers be the same as bert

pls correct me if im wrong

Answer: d

Explanation:

d is the anwser

COLLEGE

Your go-cart breaks down right before the end of a race, so you have to push it over the finish line. The go-cart has a mass of 85 kg. a. What is the weight of your go-cart?

b. How much force must you apply to give the go-cart an acceleration of 0.9 m/s^2

c. If you push with a force of 350 N, what is the acceleration of the cart?

d. Later, you are driving your friend's go-cart. If his cart has an acceleration of 5.5 m/s^2 and the cart's engine is applying a forward force of 720 N, what is the mass of his go cart?

a) W=mg=833 N by definition

b) F=ma=76.5 N according to Newton's second law

c) a=F/m=4.12 m/s^2

d) m=F/a=720/5.5=130.91 kg

COLLEGE

A 1.8-m uniform rod is being used to balance two buckets of paint. One pucket is full, but the other is mostly empty, and has only 0.25 the inertia of the full bucket. How far away from the full bucket is the center of mass of the system located?

Answer: 0.36 m

Explanation:

By definition, the x coordinate of the center of mass of the system obeys the following equation:

Xm = (m1x1 + m2x2 + …….+ mnxn) / m1+m2 +……+ mn

Neglecting the mass of the rod, and choosing our origin to be coincident with the location of the full bucket, we can write the following expression for the X coordinate of the center of mass (Assuming that both masses are aligned over the x-axis, so y-coordinates are zero):

Xm = 0.25 mb . 1.8 m / (1+0.25) mb

Simplifying mb, we get:

Xm= 0.36 m (to the right of the full bucket).