What is Average force: Definition and 178 Discussions
In statistics, a moving average (rolling average or running average) is a calculation to analyze data points by creating a series of averages of different subsets of the full data set. It is also called a moving mean (MM) or rolling mean and is a type of finite impulse response filter. Variations include: simple, cumulative, or weighted forms (described below).
Given a series of numbers and a fixed subset size, the first element of the moving average is obtained by taking the average of the initial fixed subset of the number series. Then the subset is modified by "shifting forward"; that is, excluding the first number of the series and including the next value in the subset.
A moving average is commonly used with time series data to smooth out short-term fluctuations and highlight longer-term trends or cycles. The threshold between short-term and long-term depends on the application, and the parameters of the moving average will be set accordingly. For example, it is often used in technical analysis of financial data, like stock prices, returns or trading volumes. It is also used in economics to examine gross domestic product, employment or other macroeconomic time series. Mathematically, a moving average is a type of convolution and so it can be viewed as an example of a low-pass filter used in signal processing. When used with non-time series data, a moving average filters higher frequency components without any specific connection to time, although typically some kind of ordering is implied. Viewed simplistically it can be regarded as smoothing the data.
Homework Statement
A ball of mass m moving with velocity v_{i} strikes a vertical wall. The angle between the ball's initial velocity vector and the wall is \theta_{i} as shown on the diagram, which depicts the situation as seen from above. The duration of the collision between the ball and...
Homework Statement
A baseball (m = 145 g) traveling 35 m/s moves a fielder's glove backward 15 cm when the ball is caught. What was the average force exerted by the ball on the glove?
Magnitude
Homework Equations
-(1/2)mv^2
The Attempt at a Solution
(1/2)(145)(35)^2=-88812.5
Homework Statement
find the average of a block being propelled propelled by an elastic band.
We know it is uniform acceleration.
my attempt on this problem
Measure the force applied of elastic band with a Newton scale. The more you strecth the farther the distance the block will travel...
Homework Statement
hi guys,
i am having trouble with this problem.
Calculate the average force of friction acting on a wood block as it is propelled along the floor by an elastic band ?
my solution and my ideas:
What does it mean by average froce of friction?
I first weighed the piece...
Homework Statement
A .145 kg pitched baseball moving at 35 m/s strikes a bat and is popped straight up (forming a 90 degree angle)to a height of 55.6 m before turning around. If the contact time is .50 seconds. calculate the average force on the ball during contact.
Homework Equations...
Homework Statement
A car is involved in a collision when it is traveling at 24m/s. The driver , of mass 85kg, is brought to rest by the seat belt in a time of 400 ms . Calculate the average force exerted on the driver by the seat belt . Compare this force with his weight , and hence...
Homework Statement
A coin of mass 10g is dropped from the top of a tall building. If after failing for 10s , it falls intosoil and penetrates to a depth of 5cm, calculate
(Q) the average force exerted on the coin by the soil.
Homework Equations
The Attempt at a Solution...
If a .045kg ball takes off at 41m/s after being hit,
a.) How much work is done on the ball?
b.) Assume that the force of the club acts parallel to the motion of the ball, and that the club is in contact with the ball for .010m. Ignore the mass of the ball and find the average force...
Small ice cubes, each of mass 5.30 g, slide down a frictionless ski-jump track in a steady stream, as shown in Figure P6.71. Starting from rest, each cube moves down through a net vertical distance of y = 1.40 m and leaves the bottom end of the track at an angle of 40.0° above the horizontal. At...
Ok, I'm using Schaum's Outline of College Physics to supplement my ultra condensed correspondance physics course. As I work through the "Supplementary Problems" I've come across this one which leaves me puzzled.
Typically a bullet leaves a standard 45 caliber pistol (5.0 inch barrel) at a speed...
Could someone help me out with this one, I can't seem to get on track here.
A ball of mass 3.5 kg is thrown upward. It leaves the thrower's hand with a velocity of 12 m/s. The ball is in the air for 2.4 seconds. Final velocity before the ball returns to the hand in -12 m/s. The change in...
A 50.0 kg person dives from a cliff above the water. From what height must he dive if he experiences an average force equal to 5.0 times his body weight (W=mg), as he comes to a stop in the water? You may assume a stopping time of 0.400 s.
So first I solved for the average force...
A 44 kg woman leaps vertically from a crouching position in which her center of mass is 48 cm above the ground. As her feet leave the floor her center of mass is 81 cm above the ground; it raises to 124 cm at the top of her leap.
What average force was exerted on her by the ground during the...
Question: Determine the average force of friction over the first drop and over the entire trip from top to bottom.
This is a question of have from a lab experment which was when we designed a "roller coaster" for a ball (it was a downwards ramps with 2 humps on it). I have the actual...
I have been having a hard time with the following question:
A 400 mL spherical flask contains 0.075 mol of an ideal gas at a temperature of 300 K. What is the average force-magnitude exerted on the walls of the flask by a single molecule?
I couldn't really start the problem because I have...
I need help with this question as well: If the baseball in example 4.5 is caught by a person whose hand recoils 0.30 m, calculate the average force on the person's hand. (The initial speed of the baseball is 44.7 m/sec and its mass is 0.50 kg.)
This is what i have, but I'm not sure if it's...
A meteor has a speed of 79.8 m/s when 787 km above the Earth. It is falling vertically (ignore air resistance) and strikes a bed of sand in which it is brought to rest in 3.19 m.
~How much work does the sand do to stop the meteor (mass = 556 kg)?
~What is the average force exerted by the sand...
A golf ball of mass 0.045 kg is hit off the tee at a speed of 42 m/s. The golf club was in contact with the ball for 4.7 10-3 s.
(a) Find the magnitude of the impulse imparted to the golf ball.
N · s
(b) Find the magnitude of the average force exerted on the ball by the golf club.
N
Alright, so here's the problem:
A 75kg passenger in a van is wearing a seat belt when the van, moving at 15m/s, collides with the concrete wall. The front end of the van collapses 0.50m as ot comes to rest.
a)What was the passenger's kinetic energy before the crash?
b)What average force...
A 3.0kg steel ball strikes a massive wall at 10m/s at an angle of 60degrees with the plane of thge wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for .20s, wut is the average force exerted on the ball by the wall?
its is wut i got..
p=mv p=mv...
Please help me with this question
An outfielder catches a baseball of mass .14kg moving at 50m/s. The glove and ball move .50m during the time the ball is stopped. What is the average force exerted by the ball on the outfielder's glove?
At first I thought this questin had to do with F=ma...
What is the average force exterted by a shot-putter on a 7.0 kg shot if the shot is moved through a distance of 2.8m and released with a speed of 13 m/s?
Can someone help me out?
Hi everyone,
I'm having a hard time understanding this problem: A molecule of mass m and speed v strikes a wall at right angles and rebounds with the same speed. If molecules, all of this type, strike the wall at intervals a time t apart (on the average) what is the average force on the wall...
What am I doing wrong?
Question:
A 41 g bullet, with horizontal velocity of 496 m/s, stops 13cm within a soid wall. What is the magnitue of the average Force from the wall stopping it?
This is how i tried to solve it
Vi = 496, Vf=0, and Xf-Xi=.13m
So Vf^2=Vi^2+2a(Xf-Xi)
Which =...
1. A 10 kg brick falls from a height of 2 m.
a. Suppose it falls unto a carpet, 1 cm thick. Assuming the force stopping it is constant, find the average force the carpet exerts on the brick. Answer: 2 x 10^4 N
b. Now if it falls onto a 5 cm foam rubber pad, what constant force is needed...
As a physics major, I feel kind of stupid asking this question, but my girlfriend was assigned a problem I just can't figure out. Hey, it's late.
A man throws a 7kg shot put with an initial speed of 13m/s. It goes 2.8m. What is the average force exerted?
Helping my daughter with her homework (trying to help).
A 65 kg parachuter hits the beach with a speed of 4.0 m/s, making a 0.2 m deep indentation in the sand. With what average force did the parachuter hit the sand?
From what I found in the text it seems you need a time (which they don't...