Answers edited by Cosmic Defect
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Can the wavelength of light change?

Question #72b9c

Is the sun getting bigger?

Some very hot rocks have a temperature of #630 ^o C# and a specific heat of #270 J/(Kg*K)#. The rocks are bathed in #45 L# of boiling water. If the heat of the rocks completely vaporizes the water, what is the minimum combined mass of the rocks?

What are spiral nebulae? How did they get their name?

If the earth were a mile closer to the sun how would it affect our temperature on earth? How far would the earth have to be from it's current orbit to notice a temperature change?

Question #d496b

Why don't pendulums work at sea?

Question #326d7

How can we derive Kirchoff's current law and Kirchoff's voltage law?

As the universe is expanding, is the solar system also expanding?

A tennis ball is thrown from a height #h# above the ground. If the coefficient of restitution #e#, what height will the ball achieve after the third collision ??

Question #2f088

Why is the temperature of the cosmic background radiation not perfectly isotropic?

Why can’t we determine the distances to galaxies using the geometric method of trigonometric parallax ?

How would you calculate the speed at which the moon revolves around the earth in m/s?

Can someone explain me how this 1.8F came? I know that change in temperature in Celsius scale is equal to change in temperature in Kelvin scale. But, what about Fahrenheit scale?

What properties of sound waves might determine how loud a sound is?

Question #27f28

Question #2f088

Question #aa702

Could I measure the moment of inertia of a fidget spinner by making it the bob of a pendulum? How?

How do you determine if the equation #y=90(5)^x# represents exponential growth or decay?

Question #cd675

What is bigger: a globular cluster or a nebula?

If some galaxies in the local group exhibit blueshift spectral lines, why aren't these blueshifts violations of the Hubble's law?

What is the difference between hot dark matter and cold dark matter? What difference does it make to cosmology?

A room is at a constant temperature of 300 K. A hotplate in the room is at a temperature of 400 K and loses energy by radiation at a rate of P. What is the rate of loss of energy from the hotplate when its temperature is 500 K?

If the diameter of a circle has endpoints A(7, 2) and B(1, 8), where is the center of the circle?

Why does the workenergy theory ignores potential energy?

Question #37681

Question #0c95e

Question #5a7d9

Question #01f3b

On the WMAP image of the cosmic microwave background radiation, are the higher density irregularities the brighter bits or the darker bits?

The halflife of arsenic81 is 33 seconds. Suppose you have 100 g  how much will remain undecayed after 12.5 days?

What is the significance of negative sign of electronic energy?

Question #edf16

A person 1.80 m tall stands in front of a plane mirror. What is the minimum height of the mirror, and how high must its lower edge be above the floor for the person to be able to see his/her whole body? Person’s eyes are 6.0 cm below the top of the head.

What is an ellipse?

A copper wire is wrapped 65 times around an unknown core of length 28cm. The current in the wire is 800mA and the magnetic field due to the electromagnet is 1.63 x 102T. What is the most likely material the wire is wrapped around?

How is it that you can have both water and ice at 0 °C and both water and steam at 100 °C?

Why do metals feel cold even when they are at room temperature?

What is the order of the stellar spectral classes?

What it the current value of the Hubble constant and why is the value so important?

What is the average lifespan of a star?

Question #8db2f

Question #a1b58

A paddle boat can move at a speed of 2 km/h in still water. The boat is paddled 6 km downstream in a river in the same time it takes to go 3 km upstream. What is the speed of the river?

How do I solve this gas problem?

Question #b0e5d

How do you increase the mechanical advantage of a thirdclass lever?

The minimum distance from the origin to the intersection of #x^2+y^2= z# with the plane #x+y+z=12# ?

Question #af0b9

An object with a mass of #6 kg# is hanging from a spring with a constant of #12 (kg)/s^2#. If the spring is stretched by # 1 m#, what is the net force on the object?

If the sun and stars are supported by gas pressure, what supports a white dwarf?

What torque would have to be applied to a rod with a length of #4 m# and a mass of #2 kg# to change its horizontal spin by a frequency #8 Hz# over #8 s#?

How did scientists come up with the Theory of the Big Bang?

Does the white dwarf star rotate?

A #7 L# container holds #12 # mol and #18 # mol of gasses A and B, respectively. Every three of molecules of gas B bind to one molecule of gas A and the reaction changes the temperature from #350^oK# to #175 ^oK#. By how much does the pressure change?

Poisuille is sI unit of viscosity ? And one pois e is equal to ?