PHYSICS HIGH SCHOOL

In which of these cases do we have enough information to say that the atom is electrically neutral? A. The atom has 4 neutrons and 4 protons.
B. The atom has 7 protons and 7 electrons.
C. The atom has 19 electrons and 19 neutrons.
 D. The atom has 15 neutrons and 15 electrons.

Answers

Answer 1
Answer: So we want to know when do we have enough information about the atom that we can say that it is electrically neutral. So the information we need to know is the number of protons, whic are positively charged particles and the number of electrons which are negatively charged particles. Number of protons has to be equal to number of electrons for the atom to have neutral charge. Neutrons are electrically neutral so their number doesn't change the charge of the atom. So the correct answer is B.
Answer 2
Answer: b. 7 protons and 7 electrons, just took the test

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A 2 kg object falls 3 meters how much potential energy did the object have beforw it fell

Answers

P.E = m*g*d
where m is the mass of body , d the vertical distance & g is the gravity acceleration and it equals constant = 9.81 m/s^2
so ,, P.E = 2 * 3 * 9.81
P.E = 58.86 N.m

Older auto-focus cameras sent out a pulse of sound and measured the time interval required for the pulse to reach an object, reflect off of it, and return to be detected. Can air temperature affect the camera's focus? New cameras use a more reliable infrared system.

Answers

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Answer:

ITS C!!

Explanation:I PROMISE!!

I GOT IT CORRECT!!!

JUST DO IT!!

How do the units of work and power compare? a) The unit for work is a watt. The unit for power is a joule, which is a watt-second. b)The unit for work is a watt. The unit for power is a joule, which is a watt per second. c)The unit for work is a joule. The unit for power is a watt, which is a joule-second.
d)The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Answers

Answer:

Option (d) is correct.

Explanation:

Work done is given by :

W = Fd, where F is force and d is displacement

Unit of work done :

The SI unit of force is Newton (N) and that of displacement is meter (m). So, the unit of work done is N-m. It is call Joule. It means that the unit of work done is Joule.

Power is given by rate at which the work is done. It is given by :

P = W/t, W is work done and t is time

Unit of power:

Unit of work is Joule (J) and that of time is second (s). It means that the unit of power is Watt and it is equal to Joule/second

Hence, the correct option is (d) "The unit for work is a joule. The unit for power is a watt, which is a joule per second".

Answer: The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Explanation:

you kick a soccer ball straight up into the air with a speed of 21.2 m/s. How long does it take he soccer ball to reach its highest point?.

Answers

about 20-30 secs to reach its full point

F=5560Kg x 2.55m/s². I need help solving this

Answers

Answer:

14178 N

Explanation:

5560 Kg * 2.55m/s^2 = 14178 Newtons (Kg*m/s^2)

Which instrument is used to measure the length of an object?

Answers

Answer:

Ruler. The first tool that can be used to measure length is a ruler. A ruler can be made of metal, wood or plastic. A ruler has linear measurement markings.

Explanation:
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