# Search results

1. ### What type of wave is described by this equation

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...
2. ### Frequency of oscillation

Thats kinda what im asking... if the displacement were greater or smaller of the mass, would it change the frequency of oscillation? And if it does, how?
3. ### Bernoulli's pressure

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=...
4. ### Frequency of oscillation

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)) =...
5. ### Average force on a rocket

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...
6. ### Spring constant, find height of projectile

I did not, how would i do that? I did take gravity into account when i found the height...
7. ### Spring constant, find height of projectile

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...
8. ### Net work calculation problem

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...
9. ### How far will the box slide?

ahhh. forgot to square the initial velocity. Thanks for all your help!
10. ### How far will the box slide?

ok so lets say i use energy. I have this equation v(initial)^2 = 2(mu)(g)(delta r) and i rearrange to find r r= v(initial)^2 / 2(mu)(g) I put all my numbers in and i get a different answer, 0.54 meters. what did i do wrong?
11. ### How far will the box slide?

Id say id be able to use kinetic energy to solve it, yay or nay?
12. ### How far will the box slide?

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 =...
13. ### Calculate the net force on the object

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...
14. ### Constant acceleration

I'm stumped. Is it one of those other constant acceleration equations? Whenever I look at them, it always seems like I'm not looking at the right one because it has more variables than what I'm given in the question
15. ### Constant acceleration

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...
16. ### Calculating error on density

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
17. ### Equations for average and maximum velocity

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...
18. ### Abundance of isotopes based on ratios

i should have mentioned that there are 4 isotopes, im given 3 ratios and am told to find the abundance of each one ie. 86Sr/88Sr= 0.12 84Sr/88Sr= 0.007 87Sr/86Sr= 2.5 i really dont know how to go about doing this
19. ### Abundance of isotopes based on ratios

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...
20. ### How to calculate density from specific weight in imperial units

could you give me a hint? to me it seems correct, im dividing lb/ft^3 by ft/s^2. so the only thing that would cancel is the ft in the numerator and denomanator. i understand that in metric it kg/m^3, but ive never used imperial. would it be lb/ft^3? how would the units cancel out?
21. ### How to calculate density from specific weight in imperial units

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...
22. ### Weight percent concentration calculation with partition coefficients

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...
23. ### Darcy equation, hydraulic conductivity calculation

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...
24. ### Pitch of net slip and plunge and trend of net slip of a fault using stereonets

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...
25. ### How do alkaline rocks get so enriched in alkalis?

How do alkaline rocks get so enriched in alkalis and incompatible trace elements ?
26. ### Middle and end members of fractionation series of high alkaline rocks

Name the middle and end-members of fractionation series that start with: a) basanite-tephrite b) trachybasalt, c) hawaiite.
27. ### What happens when olivine comes in contact with a SiO2 rich melt?

im studying for an exam and this question came up anyone know what happens?
28. ### How do i determine if a rock is qtz-norm, ol-norm, hy-norm or ne-norm?

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...
29. ### Find the distance from the sun to the planet known the orbital period problem

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...
30. ### Diameter of a planet, known the angular size and distance

alright so heres what i worked out. since from the planet the angular distance is 1 degree and the distance to the sun to the sun is 3x10^5, i draw a triangle with one degree at the planet and the wider part of the triangle is defined by the base of the triangle. i cut the triangle down the...