Physics

Is this a flawed logic or not

When we say that an object is one kilogram, we are really saying is that the object has an amount of matter that is equivalent to amount of matter that the defined kilogram contains. The amount of mat

What makes magnetic phenomena different from electric phenomena

.....-in electrical phenomena the electrons flow from one point to another ; whereas in magnetic phenomena thematerial is polarised ; one end negatively charged and the other end is positively charged

Projectile Motion Help

A projectile is launched from ground level at an angle 45 degrees above the horizontal, and lands on a rooftop 60 meters above the ground. The projectile traveled for 3.0 seconds before it landed. Wit

Physics energy problem!

1) A 2.40 kg ball is attached to a ceiling by a 1.40 m long string. The height of the room is 3 m. What is the gravitational potential energy of the ball relative to the ceiling? 2) A single barrel

Why did nature create animals eyes to glow at night when hit by light

When the animals were created there were no artificial lights so what was natures purpose.We all know that everything was created with a purpose.How would nature have known that cars would someday lig

Why is is that if a crumpled and smooth paper are dropped, they won't hit the ground at the same time

If a crumpled piece of paper and a smooth piece of paper are dropped at the same time, why dont they hit the ground at the same time? EXPLAIN!! Thanks in advance!-Easy. Air friction. The shape is di

Can mass be measured without involving weight

Does the determination of mass always have to go through weight?-Yes, there are three main properties of mass: 1) Affect by and on gravity 2) Inertia 3) Equivalence in energy When you measure the we

Why is it so hard to surpass speed of light

So in theory a body cant travel at speed of light unless it has 0 mass or infinite energy to provide acceleration. If we look at the space shuttles weve built we can see how ridiculous they are, they

Where is the mistake in that equation

(x²-14)²=5(6x²-49) = x⁴-28x²+196=30x²-245 | +245 = x⁴-28x²+441=30x² | -30x² = x⁴-58x²+441=0 x⁴=a² x²=a -> a²-58a+441=0 a1|a2 = 58/2 ± √(58/2)²-441 a1|a2 = 58/2 ± √3364/4-1764/4 a1|a2 = 58/2 ± √1600/

How does the following apply to Newton's first law of motion

When a rocket leaves a launch padthe forces become unbalanced.-regardless friction and energy losses, according to second Newtons law, F_reaction = dP/dt F_reaction = m dv/dt + v dm/dt Let u = vel

P(t) under constant volume question - GRE practice

This is for a GRE practice test question, and I am either thinking of the wrong information, the answer are wrong... Im thinking P1/T1=P2/T2...but I get P2= 32.6....which isnt listed... QUESTION: Th

How does a rocket relate to Newton's third law of motion

Impulse dP = d(m + M)v = -dm v + (m + M) dv = F dT; so that F = -dm/dT v + (m + M) dv/dT showing that for every force there is an equal but opposite counter force so the net force, the thrust from the

If water is denser than air, then if a bullet was shot in the water could it kill someone

If a bullet was shot inside the water could it kill someone? If the gun was shot outside the water, and the bullet trajectory was toward the water, would it kill some one? 2 Things have got me askin

What are some disadvantages of having many lenses in a camera design

Modern cameras feature compound lenses in which the various combinations of lenses are designed to minimize distortions in color and shape. However, there are some disadvantages of having too many len

PHYSICS QUESTION INVOLVES WORK, FORCE AND MOTION! please help!! big test tmr! :(

1. sallys car is stuck in the mud. sam pushes the car for 3 minutes with a force of 2250 Newtons, however, he is unable to move the car. How much work has Sam done? Explain fully. 2. the following st