A 3.45 kg object is attached to a vertical rod by two strings as in the figure below. The object rotates in a horizontal circle at constant speed 7.25 m/s.
(a) Find the tension in the upper string (i
When you pay your electricity bill, you are charged not for power but for the energy used.The unit for measuring the energy used is the kilowatthour (kWh).(a) How many joules are there in one kWh?(
A 24.0-kg block is initially at rest on a horizontal surface. A horizontal force of 78.0 N is required to set the block in motion, after which a horizontal force of 63.0 N is required to keep the bloc
http://www.ocr.org.uk/download/pp_09_jun/ocr_41693_pp_09_jun_gcse_a215_02.pdf
question 7 d) ii). i thought that to find speed you have to do distance x time. but time isnt given. what do i do?-You pr
Someone please help me. I am also done with a project but it is asking me about unique wave characteristics of Night Vision Goggles. Here is the question: Do the waves have crest and troughs, or compr
Im having a lot of trouble understanding this question and getting the answer. Not sure what the temperature it cools down to has to do with it. Please can someone help! thankyou
A certain supercondu
What was so surprising about the Compton effect in terms of the classical theory of how electromagnetic waves are scattered by atoms? (Hint: think about the wavelengths of the incident and scattered r
Sodium-24 has a half-life of 15 hours. How much of a 30g sample will remain undecayed after one day?
I know its really easy but have completely forgotten how to do these, working out would be apprec
I have a couple questions concerning force and friction. If you can help me with these, it will be greatly appreciated!
1)If an automobile moving along a road at constant velocity experiences a force
on, tells you that he filled it with 3.00 moles of gas. What is the volume of gas inside this balloon?-Heres a quick and dirty answer
Using the ideal gas law
PV=nRT
you have P=0.8 atmospheres
n=3 mo
The projection lens in a certain slide projector is a single thin lens. A slide 24.2 mm high is to be projected so that its image fills a screen 1.74 m high. The slide-to-screen distance is 3.04 m.
(a
The energy of a photon increases as its wave- length decreases.
What is the energy of a microwave photon with a wavelength of 2.10 cm? Planck’s constant is 6.63 × 10−34 J · s and the speed of light is
Two beetles run across flat sand, starting at the same point. Beetle 1 runs 0.49 m due east, then 0.72 m at 36o north of due east. Beetle 2 also makes two runs; the first is 1.59 m at 30o east of due
a) A 5 liter cylinder containing helium at a pressure of 2x10^6 Pa. What volume will that gas occupy at 1x10^5 Pa?
b) The same cylinder, still with the same gas inside, is left in the sun and it gets
