PHYSICS MIDDLE SCHOOL

The mass number of an atom is equal to ______.• the sum of electrons plus neutrons in the atom

• the number of protons, neutrons, and electrons in an atom

• the sum of the protons plus neutrons in the atom

• the number of electrons times the mass of an electron

Answers

Answer 1
Answer: the 3rd one...  the sum of the protons plus neutrons in the atom...
hope this helps and HAGD!
Answer 2
Answer: the protons and neutrons
I think

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The ___________ energy in a mechanical system is determined by adding the potential and kinetic energy together.

Answers

Answer:

Mechanical energy

Explanation:

The mechanical energy in a mechanical system is the summation of its kinetic energy and its potential energy.

                         Mechanical Energy= Potential Energy +Kinetic energy

Potential energy is defined as the energy stored in a stable object and kinetic energy is defined as the energy of a moving object or energy required in the motion of a object.

Answer:

mechanical energy

Explanation:

i believe thats the answer hope that helps

How wide is the moon

Answers


The moon is very nearly a sphere (ball shape).  We usually talk
about the "diameter" of a sphere, not its width. 

The moon's diameter is about  2,159 miles or 3,475 kilometers. 
That's about  27% (a little over a quarter) of the Earth's diameter.
14.6 million square miles (38 square kilometers

In unsaturated fats, the fatty acid chain is missing some atoms of _____.

Answers

hydrogen atoms.

Explanation:

This is because unsaturated fatty acids have at least two double-bonded carbon atoms, so they cannot bond with the maximum number of hydrogen atoms.

Answer:

hydrogen atom

Explanation:

they have at least two double bonded carbon atoms,so they they can't bond with the maximum number of hydrogen atom

A train is accelerating at a rate of 2 km/hr/s.  If its initial velocity is 20 km/hr, what is its velocity after 30 seconds?

Answers

Here it is. *WARNING* VERY LONG ANSWER

________________________________________... 
11) If Galileo had dropped a 5.0 kg cannon ball to the ground from a height of 12 m, the change in PE of the cannon ball would have been product of mass(m),acceleration(g)and height(h) 

The change in PE =mgh=5*9.8*12=588 J 
______________________________________... 
12.) The 2000 Belmont Stakes winner, Commendable, ran the horse race at an average speed = v = 15.98 m/s. 

Commendable and jockey Pat Day had a combined mass =M= 550.0 kg, 

Their KE as they crossed the line=(1/2)Mv^2 

Their KE as they crossed the line=0.5*550*(15.98)^2 

Their KE as they crossed the line is 70224.11 J 

______________________________________... 
13)Brittany is changing the tire of her car on a steep hill of height =H= 20.0 m 

She trips and drops the spare tire of mass = m = 10.0 kg, 

The tire rolls down the hill with an intial speed = u = 2.00 m/s. 

The height of top of the next hill = h = 5.00 m 

Initial total mechanical energy =PE+KE=mgH+(1/2)mu^2 

Initial total mechanical energy =mgH+(1/2)mu^2 

Suppose the final speed at the top of second hill is v 

Final total mechanical energy =PE+KE=mgh+(1/2)mv^2 

As mechanical energy is conserved, 

Final total mechanical energy =Initial total mechanical energy 

mgh+(1/2)mv^2=mgH+(1/2)mu^2 

v = sq rt [u^2+2g(H-h)] 

v = sq rt [4+2*9.8(20-5)] 

v = sq rt 298 

v =17.2627 m/s 

The speed of the tire at the top of the next hill is 17.2627 m/s 
______________________________________... 
14.) A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean. 

a.)The mass of bean = m = 2.0 g 

Height up to which the been jumps = h = 1.0 cm from hand 

Potential energy gained in reaching its highest point= mgh=1.96*10^-4 J or 1960 erg 

b.) The speed as the bean lands back in the palm of your hand =v=sq rt2gh =sqrt 0.196 =0.4427 m/s or 44.27 cm/s 
_____________________________ 
15.) A 500.-kg horse is standing at the top of a muddy hill on a rainy day. The hill is 100.0 m long with a vertical drop of 30.0 m. The pig slips and begins to slide down the hill. 

The pig's speed a the bottom of the hill = sq rt 2gh = sq rt 2*9.8*30 =sq rt 588 =24.249 m/s 
__________________________________ 
16.) While on the moon, the Apollo astronauts Neil Armstrong jumped up with an intitial speed 'u'of 1.51 m/s to a height 'h' of 0.700 m, 

The gravitational acceleration he experienced = u^2/2h = 2.2801 /(2*0.7) = 1.629 m/s^2 
______________________________________... 

EDIT 
1.) A train is accelerating at a rate = a = 2.0 km/hr/s. 

Acceleration 

Initial velocity = u = 20 km/hr, 

Velocity after 30 seconds = v = u + at 

Velocity after 30 seconds = v = 20 km/hr + 2 (km/hr/s)*30s = 

Velocity after 30 seconds = v = 20 km/hr + 60 km/hr = 80 km/ hr 

Velocity after 30 seconds = v = 80 km/hr=22.22 m/s 
_______________________________- 
2.) A runner achieves a velocity of 11.1 m/s 9 s after he begins. 

His acceleration = a =11.1/9=1.233 m/s^2 

Distance he covered = s = (1/2)at^2=49.95 m

A man is trying to drag a small tree that he cut down. If the static coefficientof friction of the tree on the ground is 0.5 and the tree weighs 480 N, what is
the minimum amount of horizontal force that the man will need to apply so
that the tree will start moving?

A. 240 N
B. 360 N
C. 480 N
D. 120 N

Answers

Answer:

120 N

Explanation: First we shoud consider the forces acted on a tree

Friction foce - acting opposite to the moving direction

Weight - Directly acting downwards

Reaction - Directly acting on upwards

For minimum required force should be equal to the friction force

F = μ R

F = 0.5×480

= 120N

Balance KOH+AlCl3 --> Al(OH)3 +KCL

Answers

3KOH+AlCl3--> Al(OH)3+3KCl
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