Homework Statement
x = (0.15 mm) cos (210x-120t)
what type of wave is described by this equation?
Longitudinal, transverse, angular frequency or both transverse and longitudinal
Homework Equations
NA
The Attempt at a Solution
Theres really no calculation. I thinking its longitudinal because...
Homework Statement
Calculate pressure outside the box- ATM pressure is 101325 Pa, air moving outside the box is 45 m/s, air density is 1.3 kg/m^3
Homework Equations
P + 1/2(roe)(v)^2 = Patm
The Attempt at a Solution
P + 1/2 (1.3kg/m^3)(45m/s)^2 = 101325 Pa
P + 1316.25 Pa = 101325 Pa
P=...
Homework Statement
0.54 kg mass hang vertically from a spring with k= 75 Nm. If the mass is displaced 3 cm vertically and allowed to oscillate, what is the frequency of oscillation?
Homework Equations
T= 2(pi) ((sqrt)(m/K))
F= 1/T
The Attempt at a Solution
T= 2(pi) ((sqrt)(0.54/75))
=...
Homework Statement
Rocket engine expends 1150 kg of gas in 1 second, with a velocity of -4.50×10^4 m/s. Calculate the average force exerted on the rocket by the gas during that 1.0 second interval
Homework Equations
F= m(delat)v / (delta)t
The Attempt at a Solution
F= (1150kg)(-45000m/s) / 1...
Homework Statement
A 48 gram dart is shot vertically upwards from a catapult with a spring constant of 350 N/m. The catapult is initially stretched from the equilibrium point by 21 cm. What is the height above the starting point reached by the dart?
Homework Equations
KE=PE, rearranging to...
Homework Statement
a box is pushed horizontally across a floor with a force of 70 N to the right. There is a friction force also acting on the box in the opposite direction of 18 N. if the box is displaced 8 meters. what is the net work done on the box?
Homework Equations
W(net)= Fd cos...
Homework Statement
How far will a box slide if its initial velocity is 1.5 m/s, kinetic friction is 0.15 and the object is 30 kg
Homework Equations
a= (kinetic friction)(acceleration due to gravity) and
V(final)^2 - V(initial)^2 = 2(a)(D)
The Attempt at a Solution
a= 0.15 x 9.81 m/s^2
=...
Homework Statement
Two forces are acting on an object and make a 130 degree angle between the two. One force is horizontal to the x axis and is 13N. The other is 9 N.
Calculate the net force on the object
Homework Equations
Not really equations, but I broke the one force into its x and y...
Homework Statement
A speeding car has instantenous velocity of 1 m/s when a stopwatch reads 10 seconds. It has constant acceleration of 2 m/s^2.
What is the cars speed when it reaches the stopwatch reads 12 seconds.
Homework Equations
x= (Vinitial)(DeltaT) + 1/2(a09deltaT)^2
I think this is...
Homework Statement
The density of a cylinder is calculated from the following data:
mass m= (9.1±1.1)g , diameter d = (2.8±0.2) cm , and height H= (4.1±0.6) cm.
The error on the density, before rounding, is ( in g /cm3 )
Homework Equations
The Attempt at a Solution
Homework Statement
Given height dropped and gravity constant, what is the maximum and average velocity of an object dropped from a building.
Gravity- 9.81
(Delta)y- 45 m. Height from which object is dropped
T- 3.1 seconds
Homework Equations
V= v(final)-v(initial)= a x (delta)t
V(avg)= (sqrt...
Homework Statement
how do i find abundances of isotopes of strontium if i am give their isotopic ratios and atomic masses
Homework Equations
The Attempt at a Solution
i know i have to find what the mass of each isotope is in the ratios to find the % abundance. i dont want to put up...
Homework Statement
alright so i have to find the density of a clay unit. im given a specific weight of the clay as 120 b/ft^3, the gravity constant as 32.17 ft/s^2. i need to find the density of the clay, i have no problem arranging the equation below to solve for density but im not used to...
Homework Statement
what is the weight percent concentration of SO2 in the exsolved aqueous fluid phase that existed with solution if sulphur has ppm by weight of 90. partition coefficient= 47
Homework Equations
partition coefficient- 47= concentration of aqueous fluid/ concentration of...
Homework Statement
ive done the darcy experiment in the lab already and have the data, the question asks to calculate the hydraulic conductivity,K. ive done one already and im just looking for confirmation that ive done it correctly because ive never used this equation before. I know im...
ive been given a problem in my school work. it involves 2 veins that have been cut by a fault and displaced along the fault plane. the question gives the orientation of the cut veins on either side of the wall and the orientation of the fault. it asks for the following: net slip, plunge and...
i have a rock that has been chemically anaylzed, all oxides are determined. the question is asking me to determine which is qtz-normative,, olivine-norm, hypersthene-norm or nephtaline-norm. ho do i determine which one it is based on the data i am given. the question also gives norm values for...
Homework Statement
the problem asks to find the distance from the sun to a planet. the only information the question gives the the orbital period of 27 years and asks for the answer in km.
Homework Equations
c= (2)(pi)(r)
The Attempt at a Solution
assuming the planet revolves...
Homework Statement
a planet is 5x10^8 km from its sun, from the planet, the sun has an angular size of 1 degree. what is the diameter of the sun?
Homework Equations
The Attempt at a Solution
ive drawn a diagram with the sun and the planet, with the distance between written in and...
Homework Statement
if a student writes a true-false test and guesses each answer, what is the probability that he can get 120 to 140 correct answers if there are 200 questions on the test?
Homework Equations
central limit theorm and binomial distribution
my teacher game me a chart that...
Homework Statement
a airline finds that 5% of people who bought a plane ticket do not show up for the flight. if the airline sells 160 tickets for a flight that has 155 seats, what is the probability that a seat will be available for every person holding a reservation and planning to fly...
Homework Statement
an exam is normally distributed with a mean of 75 and a variance of 64. students with a mark of 90 or above recieve an A+
a) what percentage of students recieve an A+?
b) if 12 students write the exam what is the probability 3 get A+?
Homework Equations
z-score-...
Homework Statement
a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30, what is:
a) the probability he will get perfect
b) the probability he will get at least 8 questions right
Homework...
Homework Statement
well i have my algebra exam coming up and my teacher told us that there is going to be a markov chain problem. the only problem i have is that i dont know how to get the initial transition matrix, which is crucial in getting full marks. can someone help me in determining how...
Homework Statement
alright, so i have a question which asks me to find the eigenvalues of a 3x3 square matrix A. after working on it for a long time, i cant figure it out, i know the process of it and i can do 2x2 matrices easily, i cannot figure this one out though. here is the matrix A;
2 0...
Homework Statement
In this case find the basis of subspace U
1 2 3 4
5 6 7 8
-6 -8 -10 12
Homework Equations
elementary row operations
The Attempt at a Solution
alright, so i know i have to reduce the matrix and i have done so
1 2 3 4
0 1 2 3
0 0 0 1
now the answer...
Homework Statement
Determine whether U is a subspace of R3
U= [0 s t|s and t in R]
Homework Equations
My textbook, which is vague in its explinations, says the following
"a set of U vectors is called a subspace of Rn if it satisfies the following properties
1. The zero vector 0 is in...