Category: Physics

Why does helium make things float? Helium floats because it is buoyant; its molecules are lighter than the nitrogen and oxygen molecules of our atmosphere and so they rise above it. In the car, it’s the air molecules that are actually getting pulled and pushed around by gravity as the result of the accelerating frame. […]

Is MA a force? A: Newton’s second law is defined as F=ma, where F equals force, m equals mass, and a equals acceleration. So the force exerted on an object is equal to the mass of the object multiplied by the object’s acceleration. Does an object always move in the same direction as the net […]

How many MJ are in a kWh? 3.6 MJ How many watts is 200 joules? Joules To Watts Conversion Energy in Joules (J) Time in seconds Power in watts (W) 200 joules to watts 35 5.71 300 joules to watts 40 7.5 600 joules to watts 45 13.33 1000 joules to watts 50 20 How […]

Do animals eat seeds? A new study finds that large animals eat not only large seeds but small ones too – helping with seed dispersal. If they become extinct, this could have an impact on overall biodiversity in an ecosystem. Scientists have long thought that small animals eat small seeds and large animals eat large […]

When you carry a heavy pail of water in your right arm Why do you tend to hold your left arm out horizontally away from your body? When you carry a heavy load—such as a pail of water—with one arm, why do you tend to hold your free arm out horizontally? Answer: You tend to […]

How do you know which LED bulb is bad on Christmas lights? Simply bring the light tester close to each bulb. The tester’s indicator will light up when it’s near a functioning bulb. If you have a non-contact voltage detector, bring the detector close to the wire section between each bulb to test for voltage. […]

What impulse would be needed to stop a 1500 kg car traveling at 20 m s? Q. What impulse would be needed to stop a 1500 kg car traveling at 20 m/s? 7500 Ns. Which has more momentum a 3.0 kg mass moving at 9.0 m/s or a 5.0 kg mass moving at 5.0 m […]

Do babies need to wear life jackets on boats? Under California law, every child under 13 years of age on a moving recreational vessel of any length must wear a Coast Guard-approved life jacket in serviceable condition and of a type and size appropriate for the conditions and the activity. Does a throwable count as […]

How do you solve chain rule problems? Solution: To use the chain rule for this problem, we need to use the fact that the derivative of ln(z) is 1/z. Then, by the chain rule, the derivative of g is g′(x)=ddxln(x2+1)=1×2+1(2x)=2xx2+1. Where do we apply chain rule? The chain rule can be applied to composites of […]

Is the stuff inside glow sticks toxic? The ingredients in glow sticks are generally non-toxic, and most cases will not require medical attention. However, if glow stick fluid is swallowed, it may cause an upset stomach and some mouth irritation. Can Glow sticks make you blind? If glow stick liquid is squirted into the eyes, […]