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    Marketing Research (Cost, Revenue, Etc.)

    1. Homework Statement A local grocery store has agreed to sell your homemade bread. You will use the following information along with some ideas from Chapter 3 to decide how many loaves should be manufactured each week and what price should be charged. After tracking weekly sales at several...
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    Given Current and Resistance in a Circuit, find the Voltage of a Battery

    1. Consider the group of resistors in the figure, where R1 = 12.3 and R2 = 7.95http://www.webassign.net/images/omegacap.gif. [Broken] The current flowing through the 7.95[PLAIN]http://www.webassign.net/images/omegacap.gif resistor is 1.22 A. What is the voltage of the batter...
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    Period and Spring Constant

    A 870·kg car strikes a huge spring at a speed of 16·m/s, compressing it 10.0·m. How long does it take the spring to stop the car? 2. Homework Equations - T= 2pi√m/k I don't know why I can't get this problem right. I have 2pi√870/2227.2=3.92 then you would divide that by 2 because it's...
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    Elastic Neutron Collision (Conservation of Momentum and Energy?)

    1. A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle '2 = 41° from the neutron's initial direction. The neutron's initial speed is 5.6 105 m/s. Determine the angle at...
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    Finding velocity with given force

    http://i.imgur.com/O7VpgCK.png 2. F=ma, a=F/m, V^2 = Vinitial^2 + 2a(x_final - x_inital) 3. I got an acceleration at .84 by doing a=.2/1.7, which came out to be .117647 m/s^2, which I plugged into the v equation for √.44^2+.2*.117647+.57 which gave me an answer of .572 m/s. I...
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    Impulse from bat to baseball

    A 0.14 kg baseball moves horizontally with a speed of 29 m/s toward a bat. After striking the bat the ball moves vertically upward with 46% of its initial speed. Find the direction and magnitude of the impulse delivered to the ball by the bat. Find the ° (measured from the initial direction...
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    Greatest Force without causing the rod to slip

    1. Here is the problem http://i.imgur.com/DeCXHNE.png 2. F=-cos45-sin45μ+(weight*μ*cos45)/.5-cos45 3. I plugged the numbers in the equation which we got by combining other equations for F, and I got 9.96 and it isn't accepting it. My other friends used this equation with their problems and...
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    Pulley Problem: Speed after falling a known distance

    A 1.2·kg block is tied to a string that is wrapped around the rim of a pulley of radius 7·cm. The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.37·kg, find the speed of the block after it has fallen through a height of 0.43·m. 2. F=mrω^2 and possibly...
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    Calculating Torque and Lever Arm

    Here is the problem http://imgur.com/6KRKJQu Torque = force x lever arm We are told that the force is all the same so the only thing that would determine the torque is the size of the lever arm. The ones that I'm not sure about are B and C. The rest I think I have done correctly. Just to...
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    Inertia - Moments of Inertia of a rigid body (different axes)

    Inertia -- Moments of Inertia of a rigid body (different axes) Here is the problem http://imgur.com/pL6Bdgw [Broken] So I missed class today because I was studying for a genetics test. I don't need the answer or anything but I was wondering what the general rule for inertia that I would...
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    Forces on a ramp

    Here is the link to the problem http://imgur.com/9Vnc5Er Alright, so I already know how to solve this problem, I am just struggling with the why. This is for my physics test, and he posts the answers to these in class assignments so we can review them. Looking at step 2, we are supposed to use...
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    Tension and Force diagram help

    Two buckets of sand hand from opposite ends of a rope that passes over an ideal pulley. One bucket is full and weighs 118 N; the other is only partly filled and weighs 58 N. After the buckets are released and allowed to move what is the tension in the rope I drew a force diagram but all I...
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    Tension and Time

    Illinois Jones is being pulled from a snake pit with a rope that breaks if the tension in it exceeds 725 N. If Illinois Jones has a mass of 62 kg and the snake pit is 3.9 m deep, what is the minimum time necessary to pull our intrepid explorer from the pit? F=ma and a=d/t^2 I put...
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    Quick question on Pulley Force Problems

    Alright, so I'm doing this homework problem: "A 32·kg block is connected to an empty 1·kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.41 and the coefficient of kinetic friction between the table and the block is...
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    Coefficient of Friction

    1. Here is the problem http://i.imgur.com/WH0Z4ko.png So I've set up a Free Body Diagram and I think I have it right. I have the two Forces of Weight (8.82N and 21.27N), the force of 12.8 that is pulling the .9kg box, and then the Force Normal (just the opposites of the two Forces of...
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    Force and Acceleration

    Two blocks are connected by a string, as shown in the figure. The smooth inclined surface makes an angle of = 34° with the horizontal, and the block on the incline has a mass of 5.7·kg. The mass of the hanging block is 2.4·kg. What is the magnitude of the hanging block's acceleration? I...
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    Circular Motion of an amusement park ride

    In an amusement park ride called The Roundup, passengers stand inside a 15.9 m diameter rotating ring. After the ring has acquired sufficient speed, it tilts into a vertical plane (a) Suppose the ring rotates every 4.5 s. If a rider's mass is 69 kg, with how much force does the ring push on...
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    Force Vectors

    Here is the link to the problem http://imgur.com/MGcfdr7 [Broken] I'm not really sure how to approach this. I initially thought you would get the resultant vector by doing 125cos(38) and that gave me 98, which I then divided by the cos(45) to get the hypotenuse, or F2, which gave me 138.6...
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    Free Body Diagrams

    1. The question I'm struggling on has been answered on here before but with different values. Here is the link to the question https://www.physicsforums.com/showthread.php?t=344213 but on mine I have a 1.9kg object and F1=5 and F2=2. I figured out that the Y components are 0 for both of...
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