Using a wheel and axle machine, a force of 100 N applied to the rim of a wheel can lift a load of 80 kg .The diameters of the wheel and axle are 1 m and 80 cm respectively. Determine the actual mechanical...

Using a wheel and axle machine, a force of 100 N applied to the rim of a wheel can lift a load of 80 kg .The diameters of the wheel and axle are 1 m and 80 cm respectively. Determine the actual mechanical...

Dwight uses a spring (k = 40 N/m) on a horizontal surface to make a launcher for model cars. The spring is attached to a holder that has a mass of 0.5 kg. If he compresses the spring and releases...

A 95.25 kilogram object is traveling downward at incredible speed and slams into the ground (made entirely out of concrete). How fast must this object be going (assuming that the object has...

If I tear up a piece of paper in two, and than want to put it back as it was (reverse the process) why is it not possible and how is the reversal process called?

Are there any specific harmonics (or overtones) that create its distinct sound? Can you change the sound by playing the music differently? It is so hard to understand this concept, if you are...

Calculate the rest energy and the kinetic energy of: a) A 100g ball travelling with the speed of 100m/s b) An electron travelling at a speed of 0.999c. Which one has greater...

A box that weighs 5.00x10^2 N is sliding down a ramp at a constant speed. The angle the ramp makes with the horizontal is 25 degrees. What is the coefficient of friction between the box and the ramp...

a) Is it possible for you to travel far enough and fast enough so that when you return home from a trip you are younger than your stay at home sister, who was born 5.0 yr after you...

There are many optical phenomena in the sky. To name 3: rainbows, sundogs and mirages. Explain fully how each one if formed, including how they are the same or different. Why we only see a rainbow...

Calculate the power generated by the solar cell which obtained Voc = 0.87 V and Isc = 4.1 mA upon direct exposure to sunlight. Assume a fill factor of 25%.

Hey I'm i have a physics test in a few days and am really not understanding coefficients of friction and those type of questions. I'll give you an example of what I'm dealing with.. 1)...

A model rollercoaster car weighs 3 kg. If it reaches 5 meters, how much energy is transformed into thermal energy at that point? I have other values too (it's a multiple part problem): Gravitational...

Suppose Spider-Man throws a web that is 1.00 m long with a velocity of 0.8c (γ = 5/3) with respect to the Earth. What will be the length of web as observed by J. Jonah Jameson standing on the Earth...

a. They were able to observe their tracks in cloud chambers. b. Scientists were confident in the law of Conservation of energy. c. They were able to calculate exactly how much mass...

I think a) is (b-y)^2 + x^2 = L^2; the second derivative of this can be taken to get the actual accelerations. I can't get b) though. Have been stuck on this for a while! Thank you!...

If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?

If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?

- helium, carbon, gold - sodium, chromium, copper - iodine, iron, nickel -phosphorous, nitrogen, oxygen

How can you manage to skip a flat stone over water? How can you increase the number of skips? Explain how this works and how it was used in WW2 in a squadron called the Dam Busters?

The moon is revolving around the earth at about 1 rev per 27.3 days. Assume that the average radius of the moon is 1,080 miles and the average distance from the earth to the moon is 238900 miles,...

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