Recent content by lollypop

doc al: thank you for ur fast reply, yes i got it right this time, the final temp would be 21.4 :)

I tried doing the calculations but i still get it wrong. I'm still not sure as to which delta T to use for what was in the can before adding the lead. i used Qcan+(Qice+mL)+Qwater = Qlead mc(T-0)+mc(T-0)+mL+mc(T-0)= mc(T-255), using 0 for what was in the can, is this right?

hi everybody: my problem says the following: A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure. If 0.750 kg of lead at a temperature of 255 degree celcius is dropped into the calorimeter can, what is the...

hello everybody: A hollow, plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.700 M^3 and the tension in the cord is 930 N. Calculate the buoyant force exerted by the water on the sphere. Take the density...

which gives 39.2 for g. what other number u get that u said was different??

by your formula u get 0.0082? how did u get T^2 on the numerator, when I solve for g using your formula I get (L*4pi^2)/(T^2) which i think is right.

i have checked the algebra and i keep on getting 39.2 m/s^2 as the gravity, is my formula right?

so g = (f*2pi)^2 * L f = 1/period = 1.453 Hz which gives me g= 39.2 and this is wrong . :confused:

After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 47.0 cm. She finds that the pendulum makes 97.0 complete swings in a time of 141 s . What is the value of g on this planet? a complete swing is a cycle? so the period would be 97/ 141 = 0.688??is...

i don't know which one to use, using just .5mv^2 gives me the wrong answer, is there any other formula i may use?

hi: my questions says the following: A tuning fork labeled 392 Hz has the tip of each of its two prongs vibrating with an amplitude of 0.600 mm. What is the maximum speed of the tip of a prong? for this part i found omega= frequency*2pi then plugged that in V= omega*Amplitude, so my...

thanks to all 3 of you! I understand much better now. I was getting confused as to how to set the period thing , i get confused everytime they talk about the equilibrium position and so on. :-p i'll bother some more later. thanks again

hello everybody: here is my question: In a physics lab, you attach a 0.200-kg air-track glider to the end of an ideal spring of negligible mass and start it oscillating. The elapsed time from when the glider first moves through the equilibrium point to the second time it moves through that...

hello everybody: A satellite of mass m used in a cellular telephone network is in a circular orbit at a height of h above the surface of the earth. What is the gravitational force on the satellite? Take the gravitational constant to be G , the mass of the Earth to be m_e , and the radius...

Hey , i got it! jeje, is on each leg, so i had to divide by 2 i used 195=n1+n2 0=0.49n1-0.29n2 solving for it i get for n1=71.87 nad n2=123.13, so for each leg 36 and 62 respectively.