Recent content by test2morrow

Homework Statement If the fundamental frequency for a rope fixed at both ends is 30Hz, what is the frequency of the second harmonic? Homework Equations v=f*wavelength The Attempt at a Solution correct answer is 60Hz. Can somebody please explain? Thank you.

Homework Statement Given that ice has a specific heat that is half of that of water, does it take more thermal energy to raise the temperature of 5 grams of water or 5 grams of ice by 6 degrees Celsius? Homework Equations Q=mc delta t The Attempt at a Solution So I think it...

p=mv change in KE=fd KE=1/2m(v^2) KE=p^2/2m So basically, the greater the mass, the smaller the KE. And the smaller the KE, the smaller the distance. ok...thanks.

thanks, that helped. my brain just isn't working today.

got it, thanks!

thanks!

I got 10.8 N I figured out the mass (not volume as previously stated) and used w=mg

Homework Statement A block of metal weighs 9N in air and 7N in water. What is volume of block? correct answer: 200cm^3 Homework Equations w=mg d=m/v The Attempt at a Solution I figured out that it has mass of 0.9kg on land...which may or may not be helpful.

Homework Statement A hollow sphere has average density of 3 g/cm^3 and a mass of 120g. What will the sphere weight under water? correct answer: 0.8 Homework Equations d=m/v w=mg The Attempt at a Solution I converted 120g into kg and then used w=mg to find weight on...

Homework Statement Two objects have different masses, but the same momenta. If you stop them with the same retarding force, which one will stop in the shorter distance. The heavier or lighter one? Or will both have the same distance? Homework Equations The Attempt at a...

Homework Statement A 400 cm^3 block of aluminum (D=2.7 g/cm^3) is lowered into a completely full beaker of water. What is weight of water that spills out of the beaker? Correct answer is 4N. Homework Equations D=m/v The Attempt at a Solution I figured out the volume of the...

Need help:Weighing yourself in the elevator-acceleration problem Homework Statement If you stand on a spring scale in your bathroom at home, it reads 600N, which means your mass is 60kg. If instead, you stand on the scale while accelerating at 2 m/s^2 upward in an elevator, what would the...

Homework Statement A ball is thrown straight up into the air. If we do not ignore air resistance, the acceleration of the ball as it is traveling upward is...? a.) 9.8m/s^2 b.) greater than 9.8m/s^2 c.) less than 9.8m/s^2 d.) zero Homework Equations n/a The Attempt at a...

thanks, yeah i missed out on the radius of earth

Homework Statement An astronaut weighs 900 N when measured on the surface of Earth. How large would the force of gravity be if he were in an Earth Satellite at an altitude equal to Earth's radius? The correct answer is 225 N. However, I need to know the exact steps taken to get the...