Rain Definition and 139 Threads

A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 60.0° with the vertical. Find the velocity of the rain with respect to (a) the car and...

When the water receives energy from the sun, the water on the surface will have an increased temperature and may evaporate and float up to form clouds. This seems like common sense but where did the water gained the gravitational potential energy? The increased temperature the water has must...

Please, explain the concept of terminal velocity on the help of rain drops... Is there is any retardation when rain falling to the ground.?

Homework Statement 30% chance of rain, 45% chance of windy, 62% chance rain OR wind. Assuming it is raining what is the probability that it is windy? Homework Equations P(wind or rain)= P(wind)+P(rain) - P(wind & rain) This does not work out the way I tried it... The...

Homework Statement A person moving towards east with a speed 'v' observes the rain to be falling vertically downwards. When he doubles his speed, the rain appears to come at 30° angle with the vertical. Find the actual speed and direction of rain with vertical. Homework Equations...

Homework Statement Rain is falling vertically at a constant speed of 8 m/s. At what angle (in degrees) from the vertical will the rain appear to be falling as viewed by a driver traveling on a straight, level road with a speed of 50 km/h? Homework Equations vr,c = vr,g + vc,g...

I recently solved a question related to the problem below, but am having trouble getting an intuition for the problem. Suppose an automobile is traveling at a constant horizontal velocity, u, and it's raining. There is no wind, so the raindrops do not have an initial horizontal velocity, just...

Are sulphate and sulphuric acid two different things? Does sulfate in the atmosphere lead to acid rain?

Please help with this: Suppose in recent years, it has only rained an average of 5 days a year. The weather forecast, which has an accuracy of 90%, predicts rain for tomorrow. What is the probability of rain tomorrow? A: <1% B: between 5 and 15% C: between 15 and 80% D: between 80 and...

http://iopscience.iop.org/0143-0807/8/3/011 I guess it's hard to come by original questions in science these days..

Homework Statement An open-topped railway wagon of mass M is rolling freely along straight level frictionless track at a constant velocity v0. At time t=0 the wagon enters a heavy rain shower and starts to collect rainwater. The rain falls vertically. As a consequence the wagons mass increases...

Which one is the most pure substance?Rain water or Heavy water

Homework Statement The .png file attached shows a simple rain gauge where rain water is collected through a funnel of 25cm diameter. As water flows through the sides of the vessel and it fills the vessel it exerts an upward force on the bottom surface of the float. This force is transmitted...

How will rain affect a discs flight?? We're having an argument on how much rain will reduce the distance of a thrown disc. We have a "professional" disc golfer here who says that it would decrease his distance by less than 1 percent. The rest of us aren't buying it. So, assuming that there...

Can Transmission line be dangerous during rain ?! Suppose you are standing beneath 132KV transmission line. A pretty big water drop drops from the transmission line into your bald head. Is there any chance you get shock? My understanding of physics tells me that, if the drop left the...

Homework Statement A raindrop is falling through a cloud, collecting water as it falls. If the raindrop has mass m and velocity v, show that mg = vdm/dt +mdv/dt. Assume that the drop remains spherical and that the rate of accretion is proportional to the cross-sectional area of the drop...

I am here in the northwest, where we are going to have a huge snow storm, and I'm wondering: How long would it take rain, falling at 0.3 inches per hour, to melt 6 inches of snow, and 1 inch of ice underneath said snow? Thanks, Jake

Please help me with the following problem... velocity of man wrt to ground is 3km/h due east. velocity of rain with respect to man is 4km/h and falls vertically downwards. If the man moves at 6km/hr then the velocity of rain wrt to man is?

Probability of rain this weeken?? If there is a 50% chance of rain on saturday, and the same on sunday, what's the probability of rain this weekend? The answer apparently is 75%, because three of four scenarios have rain. Following this theory, wouldn't you get the same answer if you asked...

Here is a video that I took on the 14/9/2011 after having an undefined urge to go to Stonehenge. My location was atop the first in the line of mounds that make up the Winterbourne barrows. What you can see is a rainbow formed at sunrise with the sun in direct alignment to the barrows but with no...

Why does rain appears to be inclined when observed from inside of a moving car? Assume that the rain is straight. Then the person in the moving car sees that rain is inclined and a person standing on the road sees the straight rain. Is my observation correct? When I first saw this I...

suppose rain water is being collected in bucket. does the rate at which it fill depend on wind?

drops are falling vertically in a steady rain. In order to got through the rain from one place to another in such a way so as to encounter the least number of raindrops, should you move with greatest possible speed, the least possible speed or some intermediate speed? AND WHY?

Hey Guys! I'm trying to design a portable rain harvest system for my capstone class. My project target is rural areas where people don'y have good water system. I'm thinking of making a system which collects a rain water and purifies it. Your ideas and suggestions will be appreciated.

Hi everyone, I was wondering if anyone could help me better understand dependent probabilities. I am interested in working out the daily chance of rain given the hourly chance's of rain. Historically I know that on a given hour the chance of rain is 0.1. My first approach to work out the...

My friend told me that he heard from a friend that it does. I think it's a bit of a wild concept, but is there some validity in there if not any?

I am sure this is true, traffic sounds louder when its raining, do you find it so?

Hi all, I hope to get some help from you here. I'm a quality engineer working for a coal briquettes company in Turkey. What we do is collecting the coaldust from all over Turkey and make them briquettes by pressing under high pressure (70-80 bars). We add some extra binder materials to the...

Hello, I wanted to know if air humidtiy is high because of a higher temperature does it fall like rain on me or on the clothes or ground what ever after a drop in temperature? The drop in Temperature also means a drop in humidity where does the water vapor goes, i know about cold places...

I absolutely have no idea how to answer this question. If someone could please explain to me what concept this question is trying to test and how to go about answering this question it would be immensely appreciated :) THE QUESTION: Two equal spherical rain-drops are both at a potential...

RAIN FALL QUESTIONS---CAN'T FIND PART 4 about kg! Homework Statement During a thunderstorm, a total of 0.9 inches of rain falls. How much water falls on one acre of land? (1 mi2 = 640 acres) Express your answer in the following ways. I found ft^3, m^3, and in^3, but I'm stumped on part...

I'm having some trouble with the below vector question. I've got an answer although I'm not sure if it is correct or not. Homework Statement A car travels due east with a speed of 40 kph. Rain drops are falling at a constant speed vertically with respect to Earth. The traces of the rain...

20 Liters per cubic meter of rain? A weather report for Chiclayo Peru said we received 20 liters per cubic meter of rain yesterday. How many inches of rain would a New York weather report say we received? Thanks. Tom

Homework Statement Consider a uniforms cloud of density ρ1 which consists of many little drops that are approximately still.Consider a special rain drop that is a little more bigger than the others so that it starts to fall down.Water drops stays spherical all the way.But the radius gets...

Why are clothes becoming darker when they are wet?

Homework Statement While driving north at 25 m/s during a rainstorm you notice that the rain makes an angle of 38 degrees with the vertical. While driving back home moments later at the same speed but in the opposite direction, you see that the rain is falling straight down. From these...

Homework Statement Why do large raindrops fall faster than smaller ones? Find out the mathematical relationship between raindrops terminal velocity and size. Hint: Assume that the drops are spherical and there density (d=m/v) is constant Homework Equations D=m/v The Attempt at a...

If you stand motionless under an umbrella in a rainstorm where the drops fall vertically, you remain relatively dry. However, if you start running, the rain begins to hit your legs even if they remain under the umbrella. Why?Now I know the answer, it's because when you run horizontally, your...

I was bored, my internet was out (from the rain), and so was TV. So all I could was sit there and think... So I started asking myself, how much energy does a single rain drop have and how much electricity could THEORETICALLY (100% efficiency) be produced from falling rain? So when my internet...

I have a homework about simulating the rain in C. It must require from the user the resin speed density and temperature. Can anyone help?

Hi. I need to write up a short one paragraph on a picture I took-- I just need hints or suggestions so I can go and research the effect myself. Any insights would be greatly appreciated. I have a picture of a traffic light (red). The ground is wet after rain. The red light is smeared out...

Can we stop raining using any artificial meathods?

Homework Statement A car travels due east with a speed of 45.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 45.0° with the vertical. Find the velocity of the rain with respect to the...

question(s): These are questions from an exam i took earlier tonight, but do not know if i got them correct. 1) Rain is falling with velocity 30 m/s at an angle of 60° from the vertical and is blowing due east. If a passenger inside of a train (also traveling due east) observes the rain...

Homework Statement The terminal velocity of a 3×10−5kg raindrop is about 5m/s . Assuming a drag force , and Drag Force = -bv 1. Assuming a drag force determine the value of the constant . 2. Assuming a drag force determine the time required for such a drop, starting from rest, to reach 63%...

Homework Statement Hi, I've been trying to do this problem with limited success. If someone could help me realize where I went wrong, I would greatly appreciate it Assume the downward direction is positive. A car travels due east with a horizontal speed of 53.7 km/hr. Rain is falling...

I'm currently looking at Metric for the Rain Frame in 'Exploring Black Holes' by Taylor & Wheeler (page B-13) and while it's straightforward understanding drrain (which basically equals dr), I'm having a problem getting my head around dtrain. The following is a step-by-step approach but for some...

This week's theme is both difficult and simple. The difficulty is to get a good shot that clearly shows the rain. The simple thing is that you simply have to vote for the picture that clearly shows the rain! :) 1. edward http://img181.imageshack.us/img181/9030/1000308ox8.jpg 2. Chi Meson...

[FONT="Comic Sans MS"][SIZE="5"]Singing In The Rain This week, your pictures must show a rainy scene. It must be clear enough that one can tell that it is raining. Zz. [SIZE="4"]Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted...

a man driving his car on a straight road at 25m/s looks through his side windows and sees rain fallling at 30 degrees. when he stops he sees the rain is actually falling straight down(0 degrees). what is the velocity of the rain, relative to the car a- when the car is moving b- when the car...