PHYSICS HIGH SCHOOL

Which of the following is true about the action and reaction force referred in Newton's Third Law of Motion? a. I. They have equal magnitude but directed in opposite direction. b. II. They act on the same object simultaneously. c. III. They act on different bodies. d. IV. They act simultaneously.

Answers

Answer 1

Answer:

Answer:

Option A

Explanation:

Newton's third law : They have equal magnitude but directed in opposite direction.

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A net force of 200 newtons is applied to a wagon for 3 seconds. This cause the wagons to undergo a change in momentum of ?

Answers

physics- damon, Monday, December 1, 2014 at 3:27 pm force =change in momentum\ change in time or m a if m is constant

change in momentum/3=200

change in momentum =3*200 kg m/s

Four resistors , R1=12ohms, R2= 15 ohms , R3= 18 ohms and R4=10 ohms are connected to 6 v battery in series what is the total resistance in the circuit?

Answers

Answer:

55 ohms

Explanation:

if it was series circuit, then you just need to add all the resistances

A man is carrying a trolley of mass 6kg and having K.E. of 40 J . Calculate its velocity with which he is running .

Answers

The formula to find kinetic energy is -

$K.E. = (1)/(2)*m* v^(2)$

Where,

$m = mass$

and

$v = velocity$

So, putting the values in the formula we get -

$40 = (1)/(2) *6*v^(2)$

$(40)/(3) = v^(2)$

$\sqrt (40)/(3) = 3.6514 m/s$

As we know that K.E = 1/2 mv² so
by arranging it
K.E ×2÷6 = v²
now by putting values
v²=13.33 m²/s²
so
v= 3.65 m/s....

The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in years

Answers

14x10^9 remember to hit that thanks button and rate 5 stars please!!!!

Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south. Find the magnitude and direction of a) A + B and b) A - B. Specify the directions relative due west.