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a) which measurement of the velocity of the ball do you think is the more dependable the projectile method or the pendulum method. why b) which measurement contributes to large amount of error
A pendulum consists of a slender rod, AB, of weight Wr= 8.60 lb and a wooden sphere of weight Ws= 21.7 lb .(Figure 1) The length of the rod is d = 7.70 ft and the radius of the sphere is R = 0.500 f
How long would it take to fill a 30 yd^3 packer truck that compresses waste to 750 lb/yd^3 if it travels 100 ft between stops at an average of 5mph and it takes 1 minute to load 200 lb of waste at e
Calculate the uniform flow rate in an earth-lined (n = 0.020) trapezoidal canal having bottom width 3 m, sides sloping 1V : 2H, laid on a slope of 0.0001, and having depth of 1.8 m.
One method used to store energy during times of low demand is by pumping water uphill into a reservoir. When energy demand exceeds the output produced by power plants, the water is released, moves d
What are the best dimensions for a trapezoidal canal having a side slopes of 1V : 3H and n = 0.020, if it is to carry 40 m^3/s uniformly on a slope of 0.009.
Determine from curve (a) critical depth (b) the maximum flow rate (c) the flow rate at a depth of 2.4 m and (d) the depths at which flow rate of 28.3 m^3/s may exist and the flow conditions at these
A rectangular channel of 20 f t width and having n = 0:017 carries flow of 800 f t^3/s. Calculate (a) critical depth (b) the minimum speci c energy (c) the speci c energy when depth of flow is 7 f t
What percent increase in shear force would be experience on the flat sides of a 40 ft long truck trailer as the truck speed increases from 65 mph to 75 mph. Kinematic viscosity of the air is 1.6x10^
Determine the number of gallons of paint needed to paint the outside surface of the water-supply tank, which consists of a hemispherical bottom, cylindrical sides, and a conical top. Each gallon of
Find the probability that in a sample of 100 bulbs, (a) 0 bulbs will be defective (b) 1 bulbs will be defective (c) 2 bulbs will be defective (d) 3 bulbs will be defective (e) 4 bulbs will be defect
The mean grade on a final examination was 72, and the standard deviation was 9. The top 10% of the students are to receive A's. What is the minimum grade a student must get in order to receive an A
how many students have heights, (a) Greater than 72 inches (b) Less than or equal to 64 inches (c) Between 65 and 71 inches inclusive (d) equal to 68 inches * Assume the measurements to be recorded
Above the water table the soil mass unit weight is 16 kN/m^2. Below the water table the saturated unit weight is 19.5kN/m^2. The maximum column load is 330,000 lbs. Recommend the number and depth of
Soil engineers hypothesize that the share of limestone in Austin's soils is the same as that in San Antonio soils. They take 100 bore holes in each region, with 70 showing limestone in Austin and 60
a 15 kg mass attached to a cord that is wrapped around a pulley and released from rest. the pulley has mass of 5 kg but is frictionless. consider the cord as mass less, inelastic and frictionless.
A two stage rocket with a total mass of 925kg is traveling at a speed of 6.6 10^3 m/s away from the earth . A predesigned explosion separates into two sections of equal mass that move with a speed o
If = 300 N , determine the required minimum compression in the spring so that the wedge will not move to the right. Neglect the weight of A and B. The coefficient of static friction for all contacti
An airport runway has a capacity of 60 operations (ie landing and take-offs) per hour. In a particular hour, there are 30 landings evenly spaced over the hour. During that same hour, 20 departing ai
In the Civil War there were numerous incidents in which the bullet fired from a Union soldier's rifle struck and fused with the bullet from a Confederate's rifle. Assume the impact scenario.
A pool player wants to bank ball B off of point A into the side pocket O. The ball has a diameter d = 2.25 in. and a coefficient of restitution e = 0.8 when colliding with the side of the table.
Three particles are sliding along a flat, frictionless surface. mA = 0.4 kg, mB = 0.5 kg, and mC = 0.4 kg. Before any collisions take place, vA = 15i m/s, vB = 10im/s, and vC = 5 m/s. e = 0.85 betwe
When the larger ball hits the ground and then collides with the smaller ball, it causes the small ball to bounce to a height several times greater than that from which the balls were originally rele
The force of the expanding gases on a 0.02 kg bullet is given by f=f0-f.1*t . Initially stationary at x=0 , the bullet reaches a speed of 1000 kph by the time it exits the gun. f0 = 7000 N and f1=2.
A 0.4 kg mass m is rotating on a horizontal, frictionless surface, its motion constrained by a massless, inextensible string. The distance from the string's attachment point, O, to the mass is a con