Wednesday
December 11, 2013

# Posts by hilary

Total # Posts: 37

chemistry

physics
Dolphins ca detect small fish whose size is about equal to the wavelength of the sound the dolphin makes with its echo-location system. A dolphin emits a chirp at a frequency of 220 kHz. Using the speed of water as 1530 m/s, what is the smallest fish this dolphin can detect.

physics
Which of the following are not transverse waves? a) Water ripples in a small pool. b) Sound waves traveling through water. c) Radio waves traveling through space. d) Microwaves inside a microwave oven. e) The vibrations on the surface of a drum.

chemistry
how would you find the theoretical yield of a reaction where all reactants and products are in 1:1 ratio, and there are two products formed which have the same MW. (products are collected as one..not separated) After finding the number of moles, I just multiplied by the MW, wh...

physics
i would choose the second option..both total energy and linear momentum are constant. Is this correct? tot. energy because kinetic energy is same since speed is the same and potential energy same since height stays the same. I'm not sure about linear momentum.. could someo...

physics
A ball attached to the end of a string is whirled on a horizontal circle at constant speed. Consider the linear momentum, total energy, and kinetic energy of the ball throughout its motion. Which of the following statements is true? Both linear momentum and kinetic energy are...

physics
Nate is 165 cm tall, 40 cm wide, and weighs 710 N. He needs to walk ten blocks (1000 m) against a 50 km/h head-wind. Nate pushes on the ground with the minimum force that allows him to move slowly forward at a constant speed, and against the drag from the wind. How much energy...

physics
What is the pressure gradient (the drop of pressure per length unit) in a blood vessel with a volume flow rate of ΔV/Δt = 54 cm3/s and an inner diameter of 7 mm. Hint: the viscosity coefficient of blood in the specific case we study is ηblood= 2.7 x 10-3 Ns/m2

math
5 times the opposite of a number was 56 less than 2 times the number. What is the number?

math- 6th
never mind

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