Recent content by Byeongok

Homework Statement In an experiment, 1.1kg of aluminium is heated to 92 degrees Celsius it is then dropped into 0.5kg of water at 12 degrees celsius. Find the final temperature of the mixture. (Cw= 4200JKg-1Celsius-1) (Cal= 880JKg-1Celsius-1) Homework Equations Qal = Qw The Attempt at a...

Homework Statement The speed v of sound in a gas depends on the density p and pressure P of the gass. If this dependence is in the form of a power law that is, v = kpaPb where k, a and b are constants (k a dimensionless one). a. Determine by dimensional analysis the values of a and b. b...

Homework Statement Hello, I am new to physics and i was wondering what i should do for the following equation to simplify it. Homework Equations [T]-2/[T] The Attempt at a Solution I tried 1/[T]3 Which I'm not sure is possible when dimensional analyzing. EDIT: Is it [T]-3

Oh oops! is it [T]-1 = [L] x √(1/[T]2) [T]-1 = [L]/√T2 Therefore it not dimensionally correct?

Thanks for the reply! So I've gone ahead where you left me from, [T]-1 = [L] x √([T]-2) [T]-1 = [L] x √(1/[T]2) [T]-1 = [L] x 1/√T2 Rationalized it [T]-1 = [L] x [T]2 Does that mean the equation at the start is not dimensionally correct?

Thanks, I've edited the question in. It was to dimensionally see if the equation was correct I've followed your advice and ended up at [T]-1 = [L] x √([T]-2) Could you please help me from here? Thanks!

Homework Statement Check if the equation is dimensionally correct The frequency f of vibration of a pendulum of length L is given by the equation: f = L/2π √(g/L) I'm assuming 'g' is the gravitation field strength (?), which is [L]1[T]-2 The Attempt at a Solution [/B] I did not know what...

thanks caffeinemachine!

I'm not sure if its correct but ill have ago again! EDIT: a. Pr (A and B) / Pr (B) = Pr (A) Events A and B are independent. Probability of A occurring doesn't affect the probability of B happening. b. P (A and B) / P (B) = 0 A and B are mutually exclusive. The probability of A...

Thanks for the reply! but would it be possible to find out the probability of her being able to afford 2 loaves that aren't the same type? For example, 1 sourdough and 1 white bread or 1 raisin and 1 white. Its confusing!

I am not sure but i think it means the same as Pr (A|B) Thanks!

A bakery sells 3 types of bread: raisin at 2 dollars a loaf, sourdough at 3 dollars a loaf and white at 1.5 dollars a loaf. There are twice the number of white loaves than sourdough and equal numbers of sourdough and raisin. Lillian is in a hurry and randomly selects 2 loaves and takes them to...

Hi I am new here! hopefully someone is kind enough to reply fast and help. so the question I am stuck is: Describe the relationship between two sets A and B ( A and B are non-empty) if: a. Pr(A|B)=Pr(A) b. Pr(A/B)=0 c. Pr(A/B)=Pr(A)/Pr(B) (Sorry guys can't get the fraction signs working! so...