Recent content by tascja

Homework Statement Its more of a concept question... I know that the higher the input resistance = the lower the amount of current that flows across a membrane (Im learning about cells) obviously then a decrease in input resistance would mean there is more current flowing across the...

Homework Statement Find the average velocity from the velocity-time graph: V / t 3 / 0 3 / 2 2 / 2 2 / 3 1 / 3 1 / 4 0 / 4 Homework Equations The Attempt at a Solution Im not sure if i can find the average velocity from this graph or if i have to make a position-time graph??

Homework Statement A bodybuilder holds a dumbbell of weight Wd as shown in Figure 9.8a. His arm is extended horizontally and weighs Wa = 31.0 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force M that the deltoid muscle can...

Homework Statement A woman whose weight is w = 500 N is poised at the right end of a diving board with a length of Lw = 3.90 . The board has negligible weight and is bolted down at the left end, while being supported L2 = 1.40 m away by a fulcrum, as figure shows. Find Forces F1 and F2 that...

i was wondering if someone could explain the relationship between distance/velocity/acceleration? I don't have a clear understanding how they are related.. especially when they are plotted on a graph. Ill give you a specific example: so there was a velocity-time graph where the average...

now it works, thanks :) ** 6 ticks to a wavelength, making it 16.8 m and then frequency = c/lamba = 44/16.8 = 2.6 Hz

Homework Statement A snapshot graph of a traveling wave is shown. The wave is traveling to the right at 44.0 m/s. the maximum displacement is 18.0 cm and the total distance traveled by the wave is 28.0 m What is the frequency? Homework Equations The Attempt at a Solution total distance...

thank you for all your help Doc Al! =)

is just including both their masses in the Fnet sufficient?

ok so i decided to look at this as just two boxes on top of one another... so on the upper box the only force being applied in the x direction is the friction so Fnet = ma ma = μFn (200)a = (0.8)(1960) a = 7.84 m/s^2 so I am not sure if i can assume that both boxes then have the same...

** sorry i don't know where i got 5.88 from?? but i think it should be: in the question it told me that the coefficient of friction is 0.40. Ff = μFn Fn = 14.7cos35 = 12.04 N Ff = (12.04)(0.4) = 4.816 N

Homework Statement you and your friend have just loaded a 200kg crate filled with priceless art object into the back of a 2000kg truck. As you press down on accelerator, a force, Ft, propels the truck forward. What is the max magnitude the force can have without the crate sliding? The static...

when you say combine do you mean equate or add the two equations?? Here i equated by isolating T and substituting into the other equation. so for mass1: Fnet = ma ma = T-(downsloping component of gravity) - Ff = T- 14.7sin35 - 5.88 T = (1.5)a +2.55 for mass2: Fnet = ma mg - T...

Homework Statement two masses are connected by a thing string running over a massless pulley. m1 slides on a 35deg ramp with a coefficient of kinetic friction of 0.40, while m2 hans from the string. what is the acceleration of the masses? m1 = 1.5 kg m2 = 3 kg Homework Equations Fnet =...

Homework Statement Consider the skier on the slope. She and her equipment have a mass of 60kg. She is on an incline that makes a 25deg incline [she is sliding down the hill]. a. what is her acceleration if friction is negligible? b. what is her acceleration if friction is known to be 45N...